Non-graphitizable carbon, a negative electrode for a lithium-ion secondary battery, and a lithium-ion secondary battery having high discharge capacity are disclosed, wherein a Guinier radius Rg1 in a range of a scattering vector q of 0.30 nm−1 or more and 0.40 nm−1 or less as measured by small-angle X-ray scattering and determined by Guinier analysis is 3.00 nm or more and 5.80 nm or less, a Guinier radius Rg2 in a range of the scattering vector q of 2.05 nm−1 or more and 2.85 nm−1 or less is 0.35 nm or more and 0.57 nm or less, and an average lattice plane distance d002 of a (002) plane determined by X-ray diffraction is 0.365 nm or more and 0.375 nm or less.
H01M 10/0585 - Structure ou fabrication d'accumulateurs ayant uniquement des éléments de structure plats, c.-à-d. des électrodes positives plates, des électrodes négatives plates et des séparateurs plats
2.
GAS-BLOWING UPPER NOZZLE AND CONTINUOUS CASTING METHOD
A gas-blowing upper nozzle that can prevent a gas leak and a continuous casting method using this nozzle. The gas-blowing upper nozzle includes a refractory including a gas-permeable material, and a metal case surrounding an outer circumference of the refractory, and has an upper-end metal case that extends inward from an upper end part of the metal case. An upper end of a sealing mortar part between the refractory and the metal case is covered by the upper-end metal case. In the continuous casting method, this gas-blowing upper nozzle is installed at the bottom of a tundish, and molten steel is poured from the tundish into a mold through the gas-blowing upper nozzle while an inert gas is blown into the gas-permeable material.
A galvanized steel sheet having a tensile strength of 980 MPa or more, a member, and methods for manufacturing them are disclosed. The galvanized steel sheet includes a steel sheet and a galvanized layer formed on the steel sheet, the steel sheet having a predetermined chemical composition and a microstructure containing, in terms of area fraction, ferrite: 20% to 70% and martensite: 30% to 80%, in which each of the proportion of low-Mn ferrite and the proportion of high-Mn ferrite in the entire ferrite is 20% or more and 80% or less in terms of area fraction, martensite has an average crystal grain size of 10 μm or less, and the amount of diffusible hydrogen in steel is 0.30 mass·ppm or less.
C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C23C 2/00 - Procédés de trempage à chaud ou d'immersion pour appliquer le matériau de revêtement à l'état fondu sans modifier la forme de l'objet immergéAppareils à cet effet
A blade chipping frequency is further improved, and the yield of steel sheet production is improved. By directly applying a lubricating oil to a non-trimmed steel sheet, insufficient supply of the oil is resolved. By reducing the friction, the frequency of blade chipping of the trimmer is suppressed. That is, there is provided a production method of a steel sheet including a process of cutting an edge part of the steel sheet with a rotary blade, the production method including: adhering a lubricating oil to a position to be cut with the rotary blade on a surface of the steel sheet before cutting in the process of cutting the steel sheet with the rotary blade.
B23D 19/06 - Machines à cisailler ou dispositifs de cisaillage taillant au moyen de disques rotatifs ayant des disques de cisaillage rotatifs disposés par paires travaillant conjointement avec plusieurs paires de disques de cisaillage espacées travaillant simultanément, p. ex. pour rogner ou fabriquer des bandes
B23Q 11/10 - Dispositions pour le refroidissement ou la lubrification des outils ou des pièces travaillées
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
C22C 38/48 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du niobium ou du tantale
C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium
C22C 38/54 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du bore
C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse
C22C 38/60 - Alliages ferreux, p. ex. aciers alliés contenant du plomb, du sélénium, du tellure, de l'antimoine, ou plus de 0,04% en poids de soufre
5.
GALVANIZED STEEL SHEET AND METHOD FOR PRODUCING THE SAME
A lubricant-coated galvanized steel sheet is disclosed. On a surface of a galvanized steel sheet, a film is formed that includes an acrylic resin having a glass transition point (Tg) of 100° C. or above and an acid value ratio R=acid value (mg-KOH/g)/Tg (° C.) of 1.50 or more, and 5 mass % or more of a polyolefin wax having a melting point of 100° C. or above and 145° C. or below and an average particle size of 3.0 μm or less, the coating weight of the film per side being in the range of 0.2 g/m2 or more and 2.5 g/m2 or less.
C10M 107/28 - Composés macromoléculaires obtenus par des réactions faisant intervenir uniquement des liaisons non saturées carbone-carbone contenant des monomères comportant un radical insaturé lié à un radical carboxyle, p. ex. acrylate
B05D 1/28 - Procédés pour appliquer des liquides ou d'autres matériaux fluides aux surfaces par transfert de liquides ou d'autres matériaux fluides, à partir de la surface d'éléments porteurs, p. ex. de pinceaux, tampons, rouleaux
B05D 3/02 - Traitement préalable des surfaces sur lesquelles des liquides ou d'autres matériaux fluides doivent être appliquésTraitement ultérieur des revêtements appliqués, p. ex. traitement intermédiaire d'un revêtement déjà appliqué, pour préparer les applications ultérieures de liquides ou d'autres matériaux fluides par cuisson
B05D 5/08 - Procédés pour appliquer des liquides ou d'autres matériaux fluides aux surfaces pour obtenir des effets, finis ou des structures de surface particuliers pour obtenir une surface antifriction ou anti-adhésive
C10M 107/02 - Polymères d'hydrocarburesPolymères d'hydrocarbures modifiés par oxydation
C10M 125/24 - Composés contenant du phosphore, de l'arsenic ou de l'antimoine
C10M 125/26 - Composés contenant du silicium ou du bore, p. ex. silice, sable
C10M 169/04 - Mélanges de matériaux de base et d'additifs
C10N 30/12 - Inhibition de la corrosion, p. ex. agents antirouille, agents anticorrosifs
C10N 50/02 - Forme sous laquelle est appliqué le lubrifiant au matériau à lubrifier en solution ou en suspension dans un liquide porteur qui s'évapore ultérieurement pour laisser un revêtement lubrifiant
6.
METHOD FOR MANUFACTURING HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET
A high-strength hot-dip galvanized steel sheet is manufactured from a boron-containing base steel sheet.
A high-strength hot-dip galvanized steel sheet is manufactured from a boron-containing base steel sheet.
In a pre-coating annealing step, the dew point in the range of temperatures from 300 to 500° C. is lowered and the atmosphere is rendered reductive for iron to suppress the formation of iron oxide and thereby to reduce the occurrence of ammonia. The formation of ammonia and the nitridation of the steel sheet are suppressed by accelerating heating in the above temperature range. Furthermore, the annealing time is shortened and the dew point is controlled to −55° C. or above in the temperature range of 750° C. or above so as to fix part of boron as oxide and thereby to suppress the formation of boron nitride stemming from the diffusion of boron to the steel sheet surface during annealing. The occurrence of boron nitride that causes gray point defects and black point defects is therefore suppressed.
A quality defect diagnosis device that diagnoses a quality defect occurring in a product, includes: a data dividing unit that two-dimensionally divides product data as a diagnosis subject into predetermined blocks, the product data including operational data and quality data; a data aggregation unit that extracts the operational data for each of predetermined classifications of quality defects and aggregates the extracted operational data for each of the blocks and for each region including two or more of the blocks; a quality defect determination unit that evaluates presence or absence of occurrence of a quality defect by using a plurality of prediction models and in which a relationship between the aggregated operational data and the quality data is learned; and a factor estimation unit that estimates a factor of the quality defect on a basis of a quality defect quality defect determination step result.
A galvanized steel sheet is disclosed. A method for heating a steel sheet includes heating a front surface side and a rear surface side of a steel sheet that is passing through a direct fired furnace that has an oxidation zone where operation is conducted at an air ratio of 1 or more and a reduction zone where operation is conducted at an air ratio of less than 1, in which the heating is carried out with flames injected from at least one slit burner extending in the width direction of the steel sheet while the steel sheet passes through at least the reduction zone.
C23C 2/02 - Pré-traitement du matériau à revêtir, p. ex. pour le revêtement de parties déterminées de la surface
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
C22C 38/22 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du molybdène ou du tungstène
C22C 38/26 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du niobium ou du tantale
C23C 2/00 - Procédés de trempage à chaud ou d'immersion pour appliquer le matériau de revêtement à l'état fondu sans modifier la forme de l'objet immergéAppareils à cet effet
C23C 2/28 - Post-traitement thermique, p. ex. par traitement dans un bain d'huile
A method for deoxidation refining of molten steel using a vacuum refining equipment, in which an Al-containing substance is added to molten steel inside a vacuum vessel, and deoxidation refining of the molten steel is performed in such a manner that temperature changes ΔT1 and ΔT2 of the molten steel during Al deoxidation meet Formula (1). Performing this method for deoxidation refining of molten steel as a deoxidation step can produce a steel material in which the range of the Al concentration in steel after the deoxidation step is 0.02 mass % or less. ΔT1+ΔT2<0 . . . (1), where ΔT1 represents an amount of temperature rise due to the heat of an oxidation reaction of Al, and ΔT2 represents an amount of temperature drop due to the sensible heat of the Al-containing substance added.
METHOD, DEVICE, AND PROGRAM FOR OPTIMIZATION ANALYSIS OF LOAD TRANSFER STRUCTURE IN BODY FRAME PART OF AUTOMOBILE AND METHOD OF MANUFACTURING LOAD TRANSMISSION PART IN BODY FRAME PART OF AUTOMOBILE
An optimization analysis method for a load transfer structure in a body frame part of an automobile includes: acquiring an automotive body model of all or a part of the automobile, the automotive body model being obtained by modeling the body frame part and load bearing members with a two-dimensional element and/or a three-dimensional element; setting a region where the load transfer structure in the automotive body model is allowed to be disposed as design space; generating an optimization block model obtained by performing modeling with a three-dimensional element in the design space that has been set and used for optimization analysis processing; connecting the optimization block model generated with the automotive body model and generating an optimization analysis model; setting an analysis condition for performing the optimization analysis processing; and performing optimization analysis for obtaining an optimum structure of the optimization block model under the set analysis condition.
G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]
G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
A sintered ore achieving high reducibility and low reduction-degradation property, and method for producing the same. Further, a sintered ore for hydrogen reduction and a method for producing the same. The sintered ore has a ratio PA/PB of 0.23 or more, PA representing a porosity (volume %) of particles that are 5 mm or more and are ground to an average particle size of 1 to 2 mm, and PB representing the porosity (volume %) of the particles determined using an apparent density measured by an in-liquid weighing method, and using a real density, measured by a boiling or vacuum suction method, of the particles that are ground and sieved into a particle size of less than 250 μm. The method includes using raw material including ore with a crystal water content of 4 mass % or greater. The sintered ore for hydrogen reduction has a porosity ratio PA/PB of 0.25 or more.
Provided is an iron-based powder for an oxygen reactant that has a low production cost and appropriately controlled reactivity with oxygen. The iron-based powder has a lattice interplanar spacing of 2.000 angstrom or more and 2.100 angstrom or less, as determined from a diffraction intensity curve corresponding to the (110) diffraction plane of α-Fe crystal among the diffraction peaks of X-ray diffraction.
B22F 9/08 - Fabrication des poudres métalliques ou de leurs suspensionsAppareils ou dispositifs spécialement adaptés à cet effet par des procédés physiques à partir d'un matériau liquide par coulée, p. ex. à travers de petits orifices ou dans l'eau, par atomisation ou pulvérisation
13.
HIGH-STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
A high strength steel sheet includes a steel sheet containing, by mass, C: 0.030%-0.500%, Si: 0.50%-2.50%, Mn: 1.50%-5.00%, P: not more than 0.100%, S: not more than 0.0200%, Al: not more than 1.000%, N: not more than 0.0100%, O: not more than 0.0100%, and Nb: 0.005%-0.100%, with a balance consisting of Fe and inevitable impurities, an amount of martensite is not less than 70%, an amount of retained austenite is 3%-20%, a total amount of ferrite and bainitic ferrite is not more than 10%, an instability index k of retained austenite is less than 6.1, and an instability index d of retained austenite in an initial stage of working is less than 5.7.
A martensitic stainless steel seamless pipe and a method for producing the martensitic stainless steel seamless pipe are provided. A martensitic stainless steel seamless pipe has a chemical composition containing C, Si, Mn, P, S, Cu, Ni, Cr, Al, Mo, V, Ti, Nb, N, W, and Co and satisfying the formula (1) and the formula (2), the remainder being Fe and incidental impurities, and has a yield strength of 758 MPa or more;
A martensitic stainless steel seamless pipe and a method for producing the martensitic stainless steel seamless pipe are provided. A martensitic stainless steel seamless pipe has a chemical composition containing C, Si, Mn, P, S, Cu, Ni, Cr, Al, Mo, V, Ti, Nb, N, W, and Co and satisfying the formula (1) and the formula (2), the remainder being Fe and incidental impurities, and has a yield strength of 758 MPa or more;
999.65
-
2276.19
×
C
-
17.36
×
Cu
-
44.8
×
Ni
-
34.12
×
Cr
-
23.22
×
Mo
+
80.11
×
Nb
-
932.
×
N
-
19.18
×
W
-
1.77
×
Co
>
35.
(
1
)
1.6
×
Mo
+
1.35
×
W
+
2.38
×
Co
>
7.5
(
2
)
C22C 38/52 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cobalt
C21D 6/00 - Traitement thermique des alliages ferreux
C21D 9/08 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour corps tubulaires ou tuyaux
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
C22C 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
C22C 38/48 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du niobium ou du tantale
C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium
15.
STEEL SHEET, MEMBER, AND PART, AND METHODS OF PRODUCING SAME
Provided is a high-strength steel sheet that is excellent in all of strain dispersibility, ductility, bendability, and delayed fracture resistance under atmospheric corrosion conditions in the coated state. The steel sheet has a predetermined chemical composition and microstructure, where an average value [τq] of plastic deformation initiation stress τq measured by a nanoindentation method at the ¼ thickness position of the steel sheet is 1.70 GPa or more and 3.30 GPa or less, standard deviation σq of the τq is 0.42 GPa or less, and when an average value of plastic deformation initiation stress τs measured by a nanoindentation method at the 10 μm position from the steel sheet surface is defined as [τs], the proportion of measurement points having values less than 0.85×[τs] is 30.0% or less.
Provided is a high-strength steel sheet that is excellent in all of member strength, stretch flangeability, bendability, and delayed fracture resistance under atmospheric corrosion conditions in the coated state. The steel sheet has a predetermined chemical composition and microstructure, where an average value [τq] of plastic deformation initiation stress τq measured by a nanoindentation method at the ¼ thickness position of the steel sheet is 2.50 GPa or more and 4.10 GPa or less, standard deviation σq of the τq is 0.30 GPa or less, and when an average value of plastic deformation initiation stress τs measured by a nanoindentation method at the 10 μm position from the steel sheet surface is defined as [τs], the proportion of measurement points having values less than 0.85×[τs] is 25.0% or less.
A method for producing an electrical steel sheet includes heating a steel slab having a certain composition to 1300° C. or lower, hot rolling to form a hot-rolled sheet, subjecting the hot-rolled sheet to hot-band annealing and cold rolling to form a cold-rolled steel sheet having a final sheet thickness, and subjecting the cold-rolled sheet to finishing annealing, wherein a difference in the amount of strain between grain boundary vicinity and grain interior in worked grains of the steel sheet after the cold rolling is made within a given value to preferentially develop crystal grains of particular orientation without damaging grain growability of recrystallized grains, and a cold-rolled sheet used in this production method is also disclosed.
C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/12 - Alliages ferreux, p. ex. aciers alliés contenant du tungstène, du tantale, du molybdène, du vanadium ou du niobium
C22C 38/14 - Alliages ferreux, p. ex. aciers alliés contenant du titane ou du zirconium
C22C 38/60 - Alliages ferreux, p. ex. aciers alliés contenant du plomb, du sélénium, du tellure, de l'antimoine, ou plus de 0,04% en poids de soufre
18.
HIGH STRENGTH STEEL PLATE FOR HYDROGEN TRANSPORT STEEL PIPE, METHOD FOR MANUFACTURING HIGH STRENGTH STEEL PLATE, AND STEEL PIPE FOR TRANSPORTING HYDROGEN
A high strength steel plate for a hydrogen transport steel pipe is disclosed. The high strength steel plate has a chemical composition containing, by mass %: C: 0.030% to 0.060%, Si: 0.01% to 0.50%, Mn: 0.80% to 1.80%, P: 0.015% or less, S: 0.0015% or less, Al: 0.010% to 0.080%, Cr: 0.05% to 0.50%, Nb: 0.005% to 0.080%, Ti: 0.005% to 0.020%, N: 0.0020% to 0.0080%, and Ca: 0.0005% to 0.0050%, in which the average value of the Vickers hardness at 0.25 mm below the surface of the steel plate+3σ is 225 HV or less, the top 20% grain size in the microstructure at the center of the thickness of the plate is 30 μm or less, the fatigue crack growth rate is less than 2.0×10−2 (mm/cycle) when the stress intensity factor range ΔK is 45 (MPa·m1/2), and the tensile strength is 535 MPa or more.
C21D 8/10 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de corps tubulaires
C21D 9/14 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour corps tubulaires ou tuyaux tuyaux résistant à l'usure ou à la pression
C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/26 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du niobium ou du tantale
C22C 38/28 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du titane ou du zirconium
19.
HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
A high strength steel sheet contains, by mass, C: 0.030%-0.500%, Si: 0.50%-2.50%, Mn: 1.50%-5.00%, P: not more than 0.100%, S: not more than 0.0200%, Al: not more than 1.000%, N: not more than 0.0100%, O: not more than 0.0100%, and Nb: 0.005%-0.100%, with a balance consisting of Fe and inevitable impurities, an amount of martensite is not less than 60%, an amount of retained austenite is 3%-20%, and a total amount of ferrite and bainitic ferrite is more than 10%, an instability index k of retained austenite is less than 5.9, and an instability index d of retained austenite in an initial stage of working is less than 5.8.
A HMT control method includes calculation steps (S11 to S19) of calculating a pulverized coal ratio manipulation amount by HMT control, calculating a pulverized coal injection flow rate manipulation amount by pulverized coal ratio tracking control, and prioritizing the HMT control or the pulverized coal ratio tracking control as an optimal action based on the magnitude of discrepancy between the target value and the actual value of the pulverized coal ratio, a determination step of determining a rationale for calculation of the optimal action and adding a text statement to a rationale statement indicating the rationale, and a presentation step of presenting operation information including the rationale statement and at least one of the pulverized coal ratio manipulation amount and the pulverized coal injection flow rate manipulation amount calculated as the optimal action.
A gas metal arc weld joint of pieces of high-Mn steel achieves high strength and excellent cryogenic toughness and a production method thereof, wherein, the gas metal arc weld joint is created by forming a weld metal between pieces of a steel material of austenitic steel with a high Mn content containing Mn: 18.0 to 30.0% in mass % using a shielding gas and a solid wire. The method produces the gas metal arc weld joint by including nitrogen gas in the shielding gas at a predetermined concentration or increasing the content of N in the solid wire.
Provided are a projection welded joint with improved peeling strength and delayed fracture resistance, and a method for producing the same. The projection welded joint of this disclosure has a steel sheet and a nut, in which the steel sheet has a predetermined chemical composition, and the minimum hardness Hvc (HV) of region c and the base metal hardness Hvm (HV) of the steel sheet satisfy Hvc/Hvm≤0.85. Region c is defined in the description.
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
C22C 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
C22C 38/48 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du niobium ou du tantale
C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium
C22C 38/54 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du bore
C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse
C22C 38/60 - Alliages ferreux, p. ex. aciers alliés contenant du plomb, du sélénium, du tellure, de l'antimoine, ou plus de 0,04% en poids de soufre
F16B 37/06 - Dispositifs pour fixer les écrous à des surfaces, p. ex. à des feuilles, à des plaques par soudage ou rivetage
23.
EMISSION SPECTROSCOPIC ANALYSIS METHOD FOR SB IN METAL MATERIAL, METHOD FOR MEASURING SB CONCENTRATION IN MOLTEN STEEL DURING REFINING, AND METHOD FOR MANUFACTURING STEEL MATERIAL
An emission spectroscopic analysis method includes: repeatedly causing spark discharge between a metal material and an electrode facing the metal material to cause excitation emission; spectrally dispersing the excitation emission; and measuring an emission intensity IM of a matrix element of the metal material and an emission intensity ISb of Sb contained in the metal material in order to obtain a ratio ISb/IM of the emission intensity ISb to the emission intensity IM, and the spark discharge is performed at a discharge energy of less than 0.10 J.
G01N 21/67 - Systèmes dans lesquels le matériau analysé est excité de façon à ce qu'il émette de la lumière ou qu'il produise un changement de la longueur d'onde de la lumière incidente excité électriquement, p. ex. par électroluminescence en utilisant des arcs électriques ou des décharges électriques
A stress-strain relation estimation method defines a conversion parameter obtained by converting a parameter of a Yoshida-Uemori material model, uses, as an objective function, a weighted residual square sum obtained by multiplying each of a residual between an experimental value and a calculated value of a stress-strain curve under a uniaxial tensile stress, a residual between an experimental value and a calculated value of a stress-strain curve under a tension-compression cyclic stress, and a residual between an experimental value and a calculated value of a mechanical property value of a metal sheet by an individual weighting factor, and decides the conversion parameter and the parameter so as to minimize the objective function under constraint conditions regarding possible ranges of the conversion parameter and other parameter.
G01N 3/02 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique Parties constitutives
B21D 22/02 - Estampage utilisant des dispositifs ou outils rigides
G01N 3/08 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique par application d'efforts permanents de traction ou de compression
G01N 3/32 - Recherche des propriétés mécaniques des matériaux solides par application d'une contrainte mécanique en appliquant des efforts répétés ou pulsatoires
A rail with excellent fatigue crack propagation resistance at the rail base underside is provided. The rail includes a chemical composition containing C: 0.70 mass % to 1.20 mass %, Si: 0.10 mass % to 1.20 mass %, Mn: 0.10 mass % to 1.50 mass %, P: 0.035 mass % or less, S: 0.020 mass % or less, and Cr: 0.05 mass % to 2.00 mass %, with a balance consisting of Fe and inevitable impurities. An area ratio of a pearlitic microstructure at a depth of 1 mm from a surface of a central portion of a rail base underside is 95% or more, and a value of HC expressed by Expression (1) satisfies Expression (2),
A rail with excellent fatigue crack propagation resistance at the rail base underside is provided. The rail includes a chemical composition containing C: 0.70 mass % to 1.20 mass %, Si: 0.10 mass % to 1.20 mass %, Mn: 0.10 mass % to 1.50 mass %, P: 0.035 mass % or less, S: 0.020 mass % or less, and Cr: 0.05 mass % to 2.00 mass %, with a balance consisting of Fe and inevitable impurities. An area ratio of a pearlitic microstructure at a depth of 1 mm from a surface of a central portion of a rail base underside is 95% or more, and a value of HC expressed by Expression (1) satisfies Expression (2),
HC={(12×[% C])+([% Si]/10)+([% Mn]/20)+([% Cr]/18)}2 (1)
A rail with excellent fatigue crack propagation resistance at the rail base underside is provided. The rail includes a chemical composition containing C: 0.70 mass % to 1.20 mass %, Si: 0.10 mass % to 1.20 mass %, Mn: 0.10 mass % to 1.50 mass %, P: 0.035 mass % or less, S: 0.020 mass % or less, and Cr: 0.05 mass % to 2.00 mass %, with a balance consisting of Fe and inevitable impurities. An area ratio of a pearlitic microstructure at a depth of 1 mm from a surface of a central portion of a rail base underside is 95% or more, and a value of HC expressed by Expression (1) satisfies Expression (2),
HC={(12×[% C])+([% Si]/10)+([% Mn]/20)+([% Cr]/18)}2 (1)
HC≤(120×GS)/(1.1×BS) (2).
A steel sheet and a member having high strength and excellent stretch flangeability and toughness, and methods for producing the same, are disclosed.
A steel sheet and a member having high strength and excellent stretch flangeability and toughness, and methods for producing the same, are disclosed.
The steel sheet has a chemical composition containing, in mass %, C, Si, Mn, P, Al, N, Ti, Nb, and B in specified contents, in which the total area fraction of martensite and bainite is 95% or more, the retained austenite area fraction is 5% or less, the ferrite area fraction is 1% or less, the prior-austenite grain size is 10 μm or less, the C concentration in a prior-austenite grain boundary is equal to or more than 1.5 times the C content in steel, the B concentration in the prior-austenite grain boundary is 0.05% or more in mass %, and the variation in B concentration within the same prior-austenite grain boundary is less than 0.010% in mass %.
An automotive-body layered structural member includes a first part that has been cold press-formed from a first blank of metal sheet and a second part that has been cold press-formed together with the first part from a second blank of metal sheet that has been partially joined to the first blank in a layered state, the first part and the second part being further joined together in a layered state. This automotive-body layered structural member is characterized in that a combination of a strength grade and a sheet thickness of the first blank and a strength grade and a sheet thickness of the second blank has been selected such that portions of the first part and the second part that have sprung back after the cold press forming of these parts adhere to each other in a free state.
Provided is a steel sheet that has a TS of 1320 MPa or more, as well as excellent stretch flangeability, and excellent toughness and crash properties after paint baking. The steel sheet has a defined chemical composition and a microstructure where an area fraction of tempered martensite is 95% or more, an area fraction of retained austenite is less than 3%, a total area fraction of bainitic ferrite and ferrite is less than 5%, and a 20° or greater grain boundary density in tempered martensite is 1.0 μm/μm2 or more, satisfying the following
Provided is a steel sheet that has a TS of 1320 MPa or more, as well as excellent stretch flangeability, and excellent toughness and crash properties after paint baking. The steel sheet has a defined chemical composition and a microstructure where an area fraction of tempered martensite is 95% or more, an area fraction of retained austenite is less than 3%, a total area fraction of bainitic ferrite and ferrite is less than 5%, and a 20° or greater grain boundary density in tempered martensite is 1.0 μm/μm2 or more, satisfying the following
Expression
(
1
)
KAM
(
S
)
/
KAM
(
C
)
>
1.
(
l
)
Provided is a steel sheet that has a TS of 1180 MPa or more, high EL, and also excellent toughness and crash properties after paint baking. The steel sheet has a defined chemical composition and a microstructure where an area fraction of tempered martensite is 83% or more, an area fraction of retained austenite is less than 3%, a total area fraction of bainitic ferrite and ferrite 5 % or more and less than 15%, and a 20° or greater grain boundary density in tempered martensite is 1.0 μm/μm2 or more, satisfying the following
Provided is a steel sheet that has a TS of 1180 MPa or more, high EL, and also excellent toughness and crash properties after paint baking. The steel sheet has a defined chemical composition and a microstructure where an area fraction of tempered martensite is 83% or more, an area fraction of retained austenite is less than 3%, a total area fraction of bainitic ferrite and ferrite 5 % or more and less than 15%, and a 20° or greater grain boundary density in tempered martensite is 1.0 μm/μm2 or more, satisfying the following
Expression
(
1
)
KAM
(
S
)
/
KAM
(
C
)
>
1.
(
1
)
A method for manufacturing a press formed article for forming a metal sheet into a target component shape having a bending portion bent along a longitudinal direction in a cross section including top plate and vertical wall portions; wherein, an angle between the top plate and vertical wall portions is called a vertical wall angle. A first step of press-forming an intermediate component using a die set having a forming surface of a first vertical wall angle smaller than a target component shape vertical wall angle, and a second step of press-forming the intermediate component with a die set having a second vertical wall angle forming surface equal to or greater than the target component shape vertical wall angle are included. The intermediate component vertical wall angle after release is set to the first vertical wall angle having an angle smaller than the target component shape vertical wall angle.
B21D 5/02 - Cintrage des tôles le long de lignes droites, p. ex. pour former un pli simple sur des presses particulières sans fixation de la pièce
B21D 31/00 - Autres procédés de travail des tôles, tubes ou profilés métalliques
31.
METHOD FOR PREDICTING SHEET TEMPERATURE OF STEEL STRIP, METHOD FOR CONTROLLING SHEET TEMPERATURE OF STEEL STRIP, STEEL STRIP PRODUCTION METHOD, AND METHOD FOR GENERATING STEEL STRIP SHEET TEMPERATURE PREDICTION MODEL
A method for predicting sheet temperature of a steel strip, a method for controlling sheet temperature of a steel strip, a steel strip production method, and a method for generating a steel strip sheet temperature prediction model, each capable of controlling, with high accuracy, the annealing temperature for a steel strip that enables the steel strip to obtain stable and excellent magnetic properties. The method for predicting the sheet temperature of a steel strip includes acquiring, as input data, operation data, an attribute parameter related to dimensions of the steel strip, an attribute parameter related to the composition of the steel strip components, and an attribute parameter related to the steel strip shape; and inputting, to a sheet temperature prediction model, the input data that has been acquired, thereby causing the model to output a sheet temperature of the steel strip on the outlet side of the soaking zone.
A method of determining the slab length and charging position of a slab in a walking-beam heating furnace uses a constraint equation defining an overhang amount, a constraint equation defining a scab defect occurrence probability corresponding to the overhang amount, and a constraint equation defining upper and lower limits of the slab length, and determines the length of the slab and the charging position of the slab. As the overhang amount, a lead end overhang amount, defined as a distance between a lead end coordinate of the slab in the heating furnace and a second skid coordinate counted from a lead end in a tail end direction, and a tail end overhang amount, defined as a distance between a tail end coordinate of the slab in the heating furnace and a second skid coordinate counted from a tail end in a lead end direction, are used.
F27B 9/20 - Fours dans lesquels la charge est déplacée mécaniquement, p. ex. du type tunnel Fours similaires dans lesquels la charge se déplace par gravité caractérisés par le trajet de la charge pendant le traitementFours dans lesquels la charge est déplacée mécaniquement, p. ex. du type tunnel Fours similaires dans lesquels la charge se déplace par gravité caractérisés par le procédé de déplacement de la charge pendant le traitement la charge se déplaçant sur un trajet sensiblement rectiligne
F27B 9/38 - Aménagement des dispositifs de chargement
33.
CONTINUOUSLY CAST SLAB AND MANUFACTURING METHOD THEREFOR
A continuously cast slab and a manufacturing method thereof are disclosed. The continuously cast slab has a given chemical composition, in which an average prior austenite grain size ratio (d20/d10) is 1.0 to 4.0, provided that d10 is an average prior austenite grain size at a position 10 mm below a surface layer of the continuously cast slab and d20 is an average prior austenite grain size at a position 20 mm below the surface layer, and in which a microstructure at the position 10 mm below the surface layer is such that a total of an area ratio of ferrite and an area ratio of pearlite is 80% or more, and a microstructure at the position 20 mm below the surface layer is such that a total of an area ratio of ferrite and an area ratio of pearlite is 60% or more.
An arc welded joint manufactured by lap fillet arc welding at a corner formed by two steel sheets, includes an upper sheet, a lower sheet, and a weld joining the upper sheet and the lower sheet. In the arc welded joint, the upper sheet and the lower sheet have a predetermined thickness; a lower sheet thickness t2 and a penetration depth d, which is a distance from a boundary between the upper sheet and the lower sheet to a lower surface of a weld bead in a cross-section of the weld, satisfy a predetermined inequality; and a slag coverage area ratio SRATIO calculated by a predetermined equation using a bead surface area SBEAD of a weld bead surface and a slag surface area SSLAG, which is an area of a region of the bead surface area SBEAD covered with slag, is less than or equal to 15%.
A hot-rolled steel sheet has a certain chemical composition, the area ratio of ferrite in a metallographic structure is 95% or greater, curved carbide strings containing Ti are present, the particle-dispersion strengthening amount is 290 MPa or greater, the stress increase rate of the steel sheet subjected to uniform elongation is 1200 MPa or greater at a point where the steel sheet has a strain of 80%, and the tensile strength is 780 MPa or greater. The method for producing the hot-rolled steel sheet includes a finishing-rolling step of performing finishing rolling by setting the start temperature to greater than 1000° C., setting the rolling reduction for each of first and second passes to 35% or greater, and setting the total rolling reduction for passes from a third pass to the completion of the rolling to 85% or less.
A high-strength steel plate for a hydrogen transporting steel pipe has a particular chemical composition, and, at the plate thickness center position of the steel plate, the area fraction of the TD//{001} crystal plane is 10% or less where TD is a direction normal to side surfaces of the steel plate during rolling and MA is 5% or less in terms of area fraction, and the tensile strength is 625 MPa or higher.
A technology for melting a cold iron source with high productivity and reduced electric power unit consumption. Specifically, a method for producing molten iron by melting a cold iron source with electric energy, using an electric furnace, the method including disposing a burner in the electric furnace, the burner including an injection hole that injects a fuel, and an injection hole that injects a combustion-supporting gas, the burner being adapted to inject a flame from the injection hole toward a furnace content in the electric furnace; and when blowing in a powdery or powdered auxiliary raw material such that the auxiliary raw material passes through the flame formed by the burner, adjusting a supply rate of the auxiliary raw material or a supply rate of the fuel for the burner in accordance with a melting condition of the cold iron source in the electric furnace.
A stainless steel seamless pipe has a chemical composition containing, in mass %, C: 0.06% or less, Si: 1.0% or less, Mn: 0.01 to 1.0%, P: 0.05% or less, S: 0.005% or less, Cr: 15.2 to 18.0%, Mo: 1.5 to 4.3%, Cu: 0.5 to 3.5%, Ni: 3.5 to 5.2%, V: 0.5% or less, Al: 0.10% or less, N: 0.10% or less, and O: 0.010% or less, with the balance being Fe and incidental impurities and has a microstructure including a martensite phase at a volume fraction of 40% or more, a ferrite phase at a volume fraction of 15 to 55%, and a retained austenite phase at a volume fraction of 40% or less, with the average of ferrite filling factors being 0.80 or less. The yield strength of the stainless steel seamless pipe is 758 MPa or more.
C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
C21D 6/00 - Traitement thermique des alliages ferreux
C21D 8/10 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de corps tubulaires
C21D 9/08 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour corps tubulaires ou tuyaux
C21D 9/14 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour corps tubulaires ou tuyaux tuyaux résistant à l'usure ou à la pression
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
C22C 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
39.
SUBMERGED ARC WELDING METHOD AND METHOD OF PRODUCING WELDED JOINT
Provided is a submerged arc welding method capable of producing a welded joint that is free of welding defects and satisfies requirements for yield stress, tensile strength, and toughness, even when carrying out submerged arc welding of a 780 MPa grade steel with a heat input of 300 kJ/cm or more. In the submerged arc welding method, a welding wire to be used has a specified composition, and CeqW (Expression 1) calculated from the composition is defied to be 0.40 to 0.80. Further, a flux to be used has a specified composition, and α (Expression 2) calculated from the composition is defied to be 0.35 to 0.70.
Provided is a submerged arc welding method capable of producing a welded joint that is free of welding defects and satisfies requirements for yield stress, tensile strength, and toughness, even when carrying out submerged arc welding of a 780 MPa grade steel with a heat input of 300 kJ/cm or more. In the submerged arc welding method, a welding wire to be used has a specified composition, and CeqW (Expression 1) calculated from the composition is defied to be 0.40 to 0.80. Further, a flux to be used has a specified composition, and α (Expression 2) calculated from the composition is defied to be 0.35 to 0.70.
CeqW
=
[
C
]
W
+
[
Si
]
W
/
24
+
[
Mn
]
W
/
6
+
[
Ni
]
W
/
40
+
[
Cr
]
W
/
5
+
[
Mo
]
W
/
4
(
1
)
α
=
(
0
.
3
-
[
Fe
]
F
/
200
)
×
{
[
Si
]
F
/
24
+
[
Mn
]
F
/
6
+
[
Ni
]
F
/
40
+
[
Cr
]
F
/
5
+
[
Mo
]
F
/
4
}
+
0.4
×
CeqW
(
2
)
B23K 35/02 - Baguettes, électrodes, matériaux ou environnements utilisés pour le brasage, le soudage ou le découpage caractérisés par des propriétés mécaniques, p. ex. par la forme
B23K 35/36 - Emploi de compositions non métalliques spécifiées, p. ex. comme enrobages, comme fluxEmploi de matériaux de brasage ou de soudage spécifiés associé à l'emploi de compositions non métalliques spécifiées, dans lequel l'emploi des deux matériaux est important
B23K 35/362 - Emploi de compositions spécifiées de flux
C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse
A repair apparatus for a container having an opening at an upper side and a refractory material layer on an inner surface includes a support frame spanning across the opening, a turning drive unit, a vertical support member extending in a vertical direction, a horizontal support member supported by the vertical support member in a liftable and lowerable manner and extending in a horizontal direction, a lifting drive unit configured to lift and lower the horizontal support member, a crushing device provided at one end of the horizontal support member and including a crushing tool at a tip thereof, and a reaction force support device provided at another end of the horizontal support member and including, at a tip thereof, an abutting member that abuts against the refractory material layer.
A resistance spot welding method is for joining a plurality of steel sheets together by clamping a sheet assembly, consisting of the plurality of overlapping steel sheets, between a pair of welding electrodes, and applying a current to the sheet assembly while applying pressure thereon. The method includes a holding step of holding the welding electrodes after completion of the application of current. In the holding step, a pressure holding time is controlled within a predetermined time range defined by a particular relational expression using the C content, the Si content, and the Mn content of a steel sheet, the thickness of a decarburized layer per one surface of the steel sheet, and the amount of internal oxidation per one surface of the steel sheet.
Provided is a steel plate that has excellent HIC resistance. The steel plate has a defined chemical composition, and in a region inward from a depth of ¼ thickness from both surfaces of the steel plate in the thickness direction, inclusions are present that have an average composition of 10 mass % to 40 mass % MgO and 10.0 mass % or less MnS, and an average MnS aspect ratio of 15 or less, and an average value of the top 10% of the circle equivalent diameters of the inclusions is 3.5 μm or less. A crack area ratio CAR after an HIC test in the region is 5.0% or less.
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/08 - Alliages ferreux, p. ex. aciers alliés contenant du nickel
C22C 38/12 - Alliages ferreux, p. ex. aciers alliés contenant du tungstène, du tantale, du molybdène, du vanadium ou du niobium
C22C 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre
C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
C22C 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
C22C 38/48 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du niobium ou du tantale
C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium
43.
METHOD OF SURFACE PROCESSING OF METAL MATERIAL, METHOD OF SURFACE PROCESSING OF METAL SHEET, AND METHOD OF PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Provided is a means to suppress a decrease in the amount of thermal strain when production line speed is increased, and to both improve production efficiency and stabilize an iron loss improvement effect during operation. The means is a method of surface processing a metal material or a metal sheet including irradiating the surface of the metal material or the metal sheet with an energy beam under at least two focus settings.
C21D 10/00 - Modification des propriétés physiques autrement que par traitement thermique ou déformation
H01F 1/16 - Aimants ou corps magnétiques, caractérisés par les matériaux magnétiques appropriésEmploi de matériaux spécifiés pour leurs propriétés magnétiques en matériaux inorganiques caractérisés par leur coercivité en matériaux magnétiques doux métaux ou alliages sous forme de feuilles
44.
STEEL SHEET, MEMBER, AND METHOD FOR PRODUCING THE SAME
A steel sheet, a member, and a method for producing them are disclosed.
A steel sheet, a member, and a method for producing them are disclosed.
The steel sheet has a chemical composition containing, in mass %: C: not less than 0.15% and not more than 0.45%; Si: not less than 0.3% and not more than 2.0%; Mn: not less than 1.7% and not more than 4.0%; P: not more than 0.10%; S: not more than 0.01%; sol. Al: not more than 0.50%; N: not more than 0.010%; and B: not less than 0.0008% and not more than 0.0100%, with the balance being Fe and incidental impurities, wherein the steel sheet has a steel microstructure where the area ratio of martensite to the entire microstructure is not less than 85% and less than 95%, and the area ratio of retained austenite to the entire microstructure is not less than 5% and not more than 15%, and wherein the number density A of precipitates having an equivalent circular diameter of 500 nm or more satisfies the formula: A (number/mm2)≤8.5×105×[B].
C21D 6/00 - Traitement thermique des alliages ferreux
C21D 8/04 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes pour produire des produits plats ou des bandes pour l'emboutissage profond
C21D 9/48 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles tôles embouties
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/08 - Alliages ferreux, p. ex. aciers alliés contenant du nickel
C22C 38/10 - Alliages ferreux, p. ex. aciers alliés contenant du cobalt
C22C 38/12 - Alliages ferreux, p. ex. aciers alliés contenant du tungstène, du tantale, du molybdène, du vanadium ou du niobium
C22C 38/14 - Alliages ferreux, p. ex. aciers alliés contenant du titane ou du zirconium
C22C 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre
C22C 38/32 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du bore
C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
C22C 38/54 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du bore
C22C 38/60 - Alliages ferreux, p. ex. aciers alliés contenant du plomb, du sélénium, du tellure, de l'antimoine, ou plus de 0,04% en poids de soufre
45.
SOLIDIFIED BODY, ROADBED MATERIAL, AND METHOD FOR MANUFACTURING SOLIDIFIED BODY
A solidified body and a method for manufacturing a solidified body, which can fix CO2 without performing a deaeration process and a carbonation process in an airtight container. The solidified body includes: a binder; at least one of a carbonated steelmaking slag, a wood material, a synthetic resin, and natural fibers; and water. The content of the at least one of a carbonated steelmaking slag, a wood material, a synthetic resin, and natural fibers is not less than 1 mass % and not more than 90 mass %.
C04B 18/24 - Déchets de végétaux, p. ex. balle de riz, rafles de maïsMatières cellulosiques, p. ex. papier
C04B 28/02 - Compositions pour mortiers, béton ou pierre artificielle, contenant des liants inorganiques ou contenant le produit de réaction d'un liant inorganique et d'un liant organique, p. ex. contenant des ciments de polycarboxylates contenant des ciments hydrauliques autres que ceux de sulfate de calcium
C04B 40/00 - Procédés, en général, pour influencer ou modifier les propriétés des compositions pour mortiers, béton ou pierre artificielle, p. ex. leur aptitude à prendre ou à durcir
E01C 7/30 - Revêtements continus réalisés sur place faits de matériaux d'empierrement et de liants de matériaux d'empierrement et d'autres liants, p. ex. de matière synthétique
A method for melting a cold iron source with high productivity and reduced electric power unit consumption. A method for producing molten iron by melting a cold iron source with electric energy, using an electric furnace including a melting chamber and a preheating chamber, method including arranging a burner in melting chamber, burner including an injection hole that injects fuel and a combustion-supporting gas, burner being adapted to inject a flame from injection hole toward molten iron in melting chamber; blowing in a powdery or powdered auxiliary raw material such that auxiliary raw material passes through flame formed by burner; and when introducing an exhaust gas generated through combustion of burner into preheating chamber to preheat cold iron source in preheating chamber, adjusting a supply rate of fuel used for burner or auxiliary raw material, thereby preheating cold iron source in preheating chamber to a predetermined temperature.
A welded joint of steel plates having a plate thickness of 50 mm or more and a method for manufacturing the welded joint are disclosed.
A welded joint of steel plates having a plate thickness of 50 mm or more and a method for manufacturing the welded joint are disclosed.
In the welded joint of the steel plates having a plate thickness T of 50 mm or more, the weld metal includes single-pass-per-layer multiple layers, the first ratio [A/p] of the sectional area A of the weld metal in a direction perpendicular to a weld line to the number of weld layers p is 120.0 mm2/layer or less, and the second ratio [H/W] of the height H to the width of each of the layers of the weld metal is 1.00 or less.
A welded portion characteristic prediction method is a method of predicting characteristics of a welded portion (5) obtained by resistance spot welding to pass a current between two electrodes (3, 4) clamping a sheet combination of three or more overlapping metal sheets, the method including acquiring electrical information outputted during resistance spot welding, inputting the electrical information to a first prediction model (221) for predicting characteristics of a first welded portion (51) and acquiring a prediction result of the characteristics of the first welded portion (51) outputted from the first prediction model (221), and inputting the electrical information to a second prediction model (222) for predicting characteristics of a second welded portion (52) and acquiring a prediction result of the characteristics of the second welded portion (52) outputted from the second prediction model (222).
B23K 31/00 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux
B23K 31/12 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux relatifs à la recherche des propriétés, p. ex. de soudabilité, des matériaux
To produce coke strong enough to withstand blast furnace use while using a larger amount of biomass as a coke raw material compared to conventional techniques, a method is provided of producing metallurgical coke by dry distillation of raw material in a chamber-type coke oven to produce metallurgical coke. The raw material contains, at 30 wt % or less relative to the raw material total, isolated lignin that satisfies specific conditions.
C10B 57/06 - Autres procédés de carbonisation ou de cokéfactionCaractéristiques générales des procédés de distillation destructive utilisant des charges de composition spéciale contenant des additifs
G01N 11/04 - Recherche des propriétés d'écoulement des matériaux, p. ex. la viscosité, la plasticitéAnalyse des matériaux en déterminant les propriétés d'écoulement en mesurant l'écoulement du matériau à travers un passage étroit, p. ex. un tube, une ouverture
50.
WIDTH PREDICTION METHOD OF ROUGH ROLLED MATERIAL, WIDTH CONTROL METHOD OF ROUGH ROLLED MATERIAL, MANUFACTURING METHOD OF HOT-ROLLED STEEL SHEET, AND GENERATION METHOD OF WIDTH PREDICTION MODEL OF ROUGH ROLLED MATERIAL
A width prediction method of a rough rolled material, which predicts a width of the rough rolled material in a hot rolling line including a heating furnace, a width reduction pressing device, a rough rolling mill, and a finish rolling mill, the width prediction method includes: a step of predicting a width distribution in a longitudinal direction of the rough rolled material by using a width prediction model learned by machine learning, the width prediction model for which an input data is data including one or more operational parameters selected from operational parameters of the width reduction pressing device and one or more operational parameters selected from operational parameters of the rough rolling mill, and an output data is information on the width distribution in the longitudinal direction of the rough rolled material.
B21B 37/16 - Commande de l'épaisseur, de la largeur, du diamètre ou d'autres dimensions transversales
G05B 13/04 - Systèmes de commande adaptatifs, c.-à-d. systèmes se réglant eux-mêmes automatiquement pour obtenir un rendement optimal suivant un critère prédéterminé électriques impliquant l'usage de modèles ou de simulateurs
51.
METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
The method includes the steps of: heating a steel slab having a defined chemical composition then hot rolling the steel slab to obtain a hot-rolled sheet; cold rolling the hot-rolled sheet once, or two or more times with intermediate annealing in between, to obtain a cold-rolled sheet; subjecting the cold-rolled sheet to decarburization annealing to obtain a decarburized annealed sheet; applying an annealing separator to the decarburized annealed sheet and then coiling the decarburized annealed sheet to obtain a coil; and subjecting the coil to final annealing. In the final annealing, at both a hottest point and a coolest point of the coil, a heating rate H1 from room temperature to 850° C. is 10.0° C./h or more and a heating rate H2 from 850° C. to 950° C. is 15.0° C./h or less.
An electromagnetic soft iron, in particular an electromagnetic soft iron suitable for use in steel bars, that has excellent magnetic properties and excellent machinability by cutting is provided. An electromagnetic soft iron according to the present disclosure contains C: 0.010 mass % or less, Si: 0.010 mass % or less, Mn: 0.10 mass % to 0.50 mass %, P: 0.010 mass % to 0.150 mass %, and S: 0.005 mass % to 0.050 mass %, with the balance being Fe and inevitable impurities.
Provided are a continuous annealing line, a continuous annealing method, a method of producing a cold-rolled steel sheet, and a method of producing a coated or plated steel sheet that can suppress occurrence of material property variation in the sheet transverse direction. The continuous annealing line is for a steel sheet, and includes a heating zone (6), a soaking zone (7), and a cooling zone (8), in this order. An induction heating device (9) is between the soaking zone and the cooling zone. A cooling device (13) cools edges of the steel sheet by gas at entry to the induction heating device. A control unit controls operating conditions of the induction heating device and the cooling device based on a phase fraction of the steel sheet downstream from the induction heating device.
C23C 2/00 - Procédés de trempage à chaud ou d'immersion pour appliquer le matériau de revêtement à l'état fondu sans modifier la forme de l'objet immergéAppareils à cet effet
C23C 2/02 - Pré-traitement du matériau à revêtir, p. ex. pour le revêtement de parties déterminées de la surface
METHOD FOR MEASURING MOLTEN MATERIAL LEVEL IN BLAST FURNACE, DEVICE FOR MEASURING MOLTEN MATERIAL LEVEL IN BLAST FURNACE, AND BLAST FURNACE OPERATION METHOD
A method for measuring a molten material level in a blast furnace includes: measuring a vibration frequency distribution in a height direction of a furnace body of the blast furnace by using vibration meters arranged at predetermined intervals along the height direction; calculating a vibration intensity in a frequency range due to blast at each of measurement positions by performing Fourier transform on the vibration frequency distribution; calculating a maximum vibration intensity distribution of a lower part of the blast furnace by using a numerical analysis model in which the molten material level and a blast amount in the blast furnace are set as variables; and calculating the molten material level at which a difference between the calculated vibration intensity and the calculated maximum vibration intensity distribution is minimized, and determining the calculated molten material level as a position of the molten material level in the blast furnace.
An electric resistance welded steel pipe includes a base metal zone and an electric resistance weld. When the electric resistance welded steel pipe is tested by a Vickers test with a load of 10 gf with respect to a location 1 mm deep from an inner surface of the electric resistance weld, a location 1 mm deep from an outer surface of the electric resistance weld, a location 1 mm deep from an inner surface of the base metal zone, and a location 1 mm deep from an outer surface of the base metal zone, indentations in each of the locations have a ratio of the number of indentations with a hardness greater than or equal to an average hardness plus 40 HV of 0.30 or less, and a ratio of the number of indentations having an eccentricity E of 0.20 or more of 0.40 or less.
An automotive body design method causing a computer to execute each of following steps for designing an automotive body in which a resin material is patched or coated to surfaces of automotive parts constituting a body-in-white structure of the automotive body and vibration-damping properties of a vibration noise reduction target part, which is a reduction target of vibration noise in the body-in-white structure, are improved, the automotive body design method includes: an optimization analysis model generation step of generating an optimization analysis model of performing optimization analysis on an optimized shape of the resin material to be patched or coated to all or some of the automotive parts in the body-in-white structure; and a resin material optimization analysis step of performing the optimization analysis using the generated optimization analysis model.
G06F 30/23 - Optimisation, vérification ou simulation de l’objet conçu utilisant les méthodes des éléments finis [MEF] ou les méthodes à différences finies [MDF]
G06F 30/15 - Conception de véhicules, d’aéronefs ou d’embarcations
G06F 119/10 - Analyse du bruit ou optimisation du bruit
An alloy pipe and a method for producing the same are disclosed. The alloy pipe of the present invention contains, as a component composition, in terms of % by mass, Cr: 11.5-35.0%, Ni: 23.0-60.0%, and Mo: 0.5-17.0%, has an austenitic phase as a microstructure, has a Mo concentration (% by mass) in a grain boundary of the austenitic phase that is 4.0 times or less than a Mo concentration (% by mass) within grains of the austenitic phase, and has a tensile yield strength in a pipe axial direction of 689 MPa or more and a ratio (compressive yield strength in a pipe axial direction)/(tensile yield strength in a pipe axial direction) of 0.85 to 1.15.
C21D 8/10 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de corps tubulaires
C21D 6/00 - Traitement thermique des alliages ferreux
C22C 38/60 - Alliages ferreux, p. ex. aciers alliés contenant du plomb, du sélénium, du tellure, de l'antimoine, ou plus de 0,04% en poids de soufre
58.
RESIN-COATED METAL SHEET AND PRODUCTION METHOD THEREFOR
Provided is a resin-coated metal sheet and a production method therefor. The resin-coated metal sheet includes: a metal sheet layer 2; and a resin layer 3 containing a polyester resin and coating a sheet surface of the metal sheet layer 2, in which the resin layer 3 has a melting point of 225° C. to 255° C. and includes: a surface layer 31 located on a surface opposite to a side facing the metal sheet layer 2; a lower layer 33 facing the metal sheet layer 2; and an intermediate layer 32 between the surface layer 31 and the lower layer 33, the surface layer 31 contains a lubricating component composed of a polyolefin having a melting point of 75° C. to 140° C., and a coverage ratio of the lubricating component exposed on a surface of the layer 31 is 0.040% to 0.80%.
C08J 3/22 - Formation de mélanges de polymères avec des additifs, p. ex. coloration en utilisant les techniques des charges mères
C08J 5/12 - Fixation d'un matériau macromoléculaire préformé au même matériau ou à un autre matériau compact, tel que du métal, du verre, du cuir, p. ex. en utilisant des adhésifs
C08L 67/02 - Polyesters dérivés des acides dicarboxyliques et des composés dihydroxylés
59.
TAILOR WELDED BLANK, AND TAILOR WELDED BLANK PRODUCTION METHOD AND TAILOR WELDED BLANK PRODUCTION APPARATUS
Provided is a tailor welded blank that can be produced at low cost with high productivity and that has excellent press workability, even when thin steel sheets are used as materials. A butt joint includes a stir zone and thermo-mechanically affected zones adjacent to the stir zone, and the stir zone has an upper stir zone and a lower stir zone adjacent to each other in a thickness direction, and the tailor welded blank satisfies the relationships according to the following formulas (1) to (3): Pj≥0.9×PbmL . . . (1); TszL≥0.9×TbmL . . . (2); and TszH≤1.1×TbmH . . . (3).
B23K 20/12 - Soudage non électrique par percussion ou par une autre forme de pression, avec ou sans chauffage, p. ex. revêtement ou placage la chaleur étant produite par frictionSoudage par friction
A method for laser welding that includes: cutting each of two steel plates to be butt-welded by using a cutting laser beam; and butt-welding the two steel plates cut by using the cutting laser beam, wherein the cutting cuts such that an angle of a cut surface of a first steel plate of the two steel plates is θ (deg), an angle of a cut surface of a second steel plate of the two steel plates is 180-θ (deg) and the θ satisfies 55.0≤θ<70.0 (1).
A molten material height detection method that can easily identify a frequency at which a molten material height in a smelting furnace can be detected and can detect a molten material height by using a vibration intensity at the frequency. The molten material height detection method for detecting a molten material height in a smelting furnace includes measuring vibration at one or more positions of a furnace wall of a lower portion of the smelting furnace, calculating a vibration intensity at a frequency that is correlated with vibration generated by introduction of a gas into an inflow hole of the lower portion by analyzing a frequency of the vibration, and detecting the molten material height by using a corrected vibration intensity obtained by removing influence of blast volume of a gas introduced through the inflow hole from the vibration intensity at the frequency.
G01F 23/2965 - Ondes acoustiques en mesurant l’atténuation des ondes transmises
F27B 1/28 - Aménagement des dispositifs de surveillance, des indicateurs, des dispositifs d'alarme
F27D 21/00 - Aménagement des dispositifs de surveillanceAménagement des dispositifs de sécurité
G01F 25/20 - Test ou étalonnage des appareils pour la mesure du volume, du débit volumétrique ou du niveau des liquides, ou des appareils pour compter par volume des appareils pour mesurer le niveau des liquides
62.
PROCESS CONTROL METHOD, BLAST FURNACE OPERATION METHOD, HOT METAL PRODUCTION METHOD, PROCESS CONTROL DEVICE, AND PROGRAM
A process control method including: a response prediction step of determining a predicted value of future hot metal temperature using a physical model; and an operation amount determination step of, when an absolute value of a difference between the predicted value of the hot metal temperature determined in the response prediction step and a target value is a defined threshold value or greater, determining a deviation between the predicted value of the hot metal temperature and the target value, and determining operation amounts of pulverized coal rate and blast moisture so that an evaluation function comprising a term corresponding to the deviation and a term for decreasing the reducing agent rate or blast moisture is minimized or maximized, and when the absolute value is less than the defined threshold value, determining the operation amounts of a combination of two of the pulverized coal rate, the blast moisture, and blast temperature.
A welded portion characteristic prediction method is a method of predicting characteristics of a welded portion (5) obtained by resistance spot welding to pass a current between two electrodes (3, 4) clamping a sheet combination of two or more overlapping metal sheets, the method including acquiring electrical information outputted during resistance spot welding, the electrical information including at least one of the current flowing between the two electrodes (3, 4), the voltage between the two electrodes (3, 4), the resistance between the two electrodes (3, 4), and the amount of heat generated 10 between the two electrodes (3, 4) during the resistance spot welding, and predicting characteristics of the welded portion (5) based on the electrical information.
B23K 31/00 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux
B23K 31/12 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux relatifs à la recherche des propriétés, p. ex. de soudabilité, des matériaux
B23K 101/00 - Objets fabriqués par brasage, soudage ou découpage
A zinc-containing material that can be used to produce electrogalvanized steel sheets with a beautiful, bright appearance is provided. Included are a zinc leaching step of bringing steelmaking dust into contact with an acidic aqueous solution to leach zinc into the solution, a first impurity precipitation step of precipitating impurities in a first treatment solution obtained in the zinc leaching step, a second impurity precipitation step of adding a chelating agent to a second treatment solution, obtained in the first impurity precipitation step to precipitate impurities, a first solid-liquid separation step of subjecting a third treatment solution, obtained in the second impurity precipitation step, to solid-liquid separation, a zinc precipitation step of precipitating a zinc-containing material in a fourth treatment solution obtained in the first solid-liquid separation step, and a second solid-liquid separation step of subjecting a fifth treatment solution obtained in the zinc precipitation step to solid-liquid separation.
C22B 3/20 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation
C22B 3/22 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés physiques, p. ex. par filtration, par des moyens magnétiques
C22B 3/44 - Traitement ou purification de solutions, p. ex. de solutions obtenues par lixiviation par des procédés chimiques
C25D 3/22 - Dépôt électrochimiqueBains utilisés à partir de solutions de zinc
65.
STEEL SHEET AND MEMBER, AND PRODUCTION METHODS THEREFOR
Provided is a steel sheet having high strength, high YS, excellent ductility, and excellent bendability. A steel sheet comprises a specified chemical composition and steel microstructure. In particular, a grain number density of retained austenite, a ratio, average C concentration, average intergrain distance, and maximum intergrain distance of grains with an aspect ratio of 3 or less, and [Mn]C/[Mn] in the steel microstructure are appropriately controlled.
KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION (Japon)
Inventeur(s)
Dohi, Yusuke
Igawa, Daisuke
Arakawa, Sara
Takehara, Kenta
Kawai, Yuya
Takashima, Takanori
Yamamoto, Tetsuya
Shimoyama, Izumi
Hayashi, Jun-Ichiro
Kudo, Shinji
Asano, Shusaku
Abrégé
A method of producing a high-density, high-strength agglomerate mainly composed of carbon from coal, or a coal-derived high carbon concentration material, with poor caking properties is provided. The method of producing an agglomerate mainly composed of carbon includes a grinding step of grinding coal having a volatile content of 1 mass % or more and less than 20 mass % on a dry basis to obtain a coal powder having a maximum particle size of 300 μm or less, and a hot pressing step of compacting the coal powder at a temperature included in a temperature range of 600° C. or more and 1250° C. or less in an oxygen-deprived environment to obtain an agglomerate.
Provided is a Zn—Al—Mg coated steel sheet that has excellent sliding properties and spot weldability while also securing excellent corrosion resistance. The Zn—Al—Mg coated steel sheet includes a steel sheet, a coated layer formed on at least one side of the steel sheet, and an oxide layer formed on a surface of the coated layer. The coated layer has a chemical composition containing, in mass %, Al: 0.5% to 10.0%, and Mg: 0.5% to 10.0%, with the balance being Zn and inevitable impurity. The surface of the coated layer has a Zn single-phase microstructure and a eutectic microstructure as described in the description. An area fraction A of the eutectic microstructure on the surface of the coated layer is less than 60%. An average thickness B of the oxide layer on the surface of the coated layer is 10 nm to 50 nm.
Provided is a resin-coated metal sheet having a smooth and aesthetic appearance by preventing appearance defects (surface roughening) that occur in a resin coating layer during heat treatment after can-making processing and preventing a decrease in smoothness of the surface of the resin coating layer during coating. A resin-coated metal sheet 1 comprises: a metal sheet 2; and a resin coating layer 3 or 4 located on at least one side of the metal sheet and containing 90 mass % or more of polyester resin relative to total resin. The resin coating layer has a crystalline content of 15% or less. A maximum value SaMAX of an arithmetic mean height Sa of a surface of the resin coating layer is 0.30 μm or less. A difference ΔSa between the maximum value SaMAX and a minimum value SaMIN of the arithmetic mean height Sa is 0.15 μm or less.
B32B 15/09 - Produits stratifiés composés essentiellement de métal comprenant un métal comme seul composant ou comme composant principal d'une couche adjacente à une autre couche d'une substance spécifique de résine synthétique comprenant des polyesters
B32B 15/18 - Produits stratifiés composés essentiellement de métal comportant du fer ou de l'acier
B32B 27/06 - Produits stratifiés composés essentiellement de résine synthétique comme seul composant ou composant principal d'une couche adjacente à une autre couche d'une substance spécifique
B32B 27/36 - Produits stratifiés composés essentiellement de résine synthétique comprenant des polyesters
B32B 37/04 - Procédés ou dispositifs pour la stratification, p. ex. par polymérisation ou par liaison à l'aide d'ultrasons caractérisés par la fusion partielle d'au moins une couche
B32B 37/10 - Procédés ou dispositifs pour la stratification, p. ex. par polymérisation ou par liaison à l'aide d'ultrasons caractérisés par la technique de pressage, p. ex. faisant usage de l'action directe du vide ou d'un fluide sous pression
B32B 38/00 - Opérations auxiliaires liées aux procédés de stratification
69.
APPARATUS FOR DETERMINING ENERGIZED STATE OF ELECTRIC ARC FURNACE, OPERATION METHOD FOR ELECTRIC ARC FURNACE, AND ELECTRIC ARC FURNACE
An apparatus for determining the energized state of an electric arc furnace, including a detection means for detecting sound generated within the electric arc furnace, an output means for analyzing a frequency of the detected sound, and outputting a frequency-sound pressure signal, and a determination means for determining a covered state of an arc due to slag foaming based on a signal intensity of sound detected at one or more frequencies or within a predetermined frequency range, both selected from 500 Hz or more but 1500 Hz or less. Also a method for producing molten steel melts and refines scrap with an electric arc furnace by controlling one or more of a combination of an oxygen-containing gas supply rate, a carbon material supply amount, and a slag forming agent supply amount, based on the energized state determined with the apparatus.
F27B 3/28 - Aménagement des dispositifs de commande, de surveillance, d'alarme ou des dispositifs similaires
C21C 5/52 - Fabrication de l'acier au four électrique
F27B 3/08 - Fours à sole, p. ex. fours à réverbérationFours à arc électrique à chauffage électrique, p. ex. fours à arc électrique, avec ou sans une autre source de chaleur
F27D 21/00 - Aménagement des dispositifs de surveillanceAménagement des dispositifs de sécurité
70.
HOT-ROLLED STEEL MATERIAL AND METHOD OF PRODUCING SAME
Provided is hot-rolled steel material for which thickness of a decarburized layer is sufficiently suppressed and that has excellent cold workability. The hot-rolled steel material includes a steel substrate that has a defined chemical composition and a decarburized layer formed on the surface of the steel substrate. In the decarburized layer, there is an enriched region where at least one of Cu and Ni is enriched. Coverage of the enriched region on a surface of the decarburized layer is 50% or more. Maximum depth of the enriched region in the decarburized layer is 1 μm or more and 150 μm or less. Total decarburization depth of the decarburized layer (DM-T), as specified in JIS G 0558, is 0.80 mm or less. Total area fraction of ferrite and pearlite in the steel substrate is 90.0% or more. Average Vickers hardness in the steel substrate is 250 HV or less.
C22C 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre
C21D 7/13 - Modification des propriétés physiques du fer ou de l'acier par déformation par travail à chaud
C21D 9/52 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour fils métalliquesTraitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour bandes métalliques
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/08 - Alliages ferreux, p. ex. aciers alliés contenant du nickel
C22C 38/12 - Alliages ferreux, p. ex. aciers alliés contenant du tungstène, du tantale, du molybdène, du vanadium ou du niobium
C22C 38/14 - Alliages ferreux, p. ex. aciers alliés contenant du titane ou du zirconium
C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
C22C 38/60 - Alliages ferreux, p. ex. aciers alliés contenant du plomb, du sélénium, du tellure, de l'antimoine, ou plus de 0,04% en poids de soufre
71.
HIGH STRENGTH STEEL SHEET, HIGH STRENGTH COATED OR PLATED STEEL SHEET, AND METHODS OF PRODUCING SAME, AND MEMBER
Provided is a high strength steel sheet that has excellent YR and a decreased amount of hydrogen trapped in steel under an acid immersion environment. The high-strength steel sheet has a chemical composition containing, in mass %, C: 0.030% to 0.500%, Si: 0.01% to 3.00%, Mn: 0.10 % to 6.00%, P: 0.100% or less, S: 0.0200% or less, Al: 1.000% or less, N: 0.0100% or less, O: 0.0100% or less, and Sb: 0.002% to 0.300%, with the balance being Fe and inevitable impurity. The steel microstructure at a ¼ sheet thickness position has a martensite area fraction of 30% or more, a ferrite area fraction of 70% or less, and a retained austenite volume fraction of 20.0 % or less, and a surface layer concentration index of Sb is 1.2 or more.
A blast furnace operating method smoothly starts up a blast furnace with a short shutdown period, thereby solving the problem with the conventional blast furnace banking technique where a long shutdown period was required. The method restarts blasting after blast stoppage including reducing the height of a raw material charge layer surface that is immediately above tuyeres of a blast furnace to a height lower than an upper end of a bosh zone of the blast furnace and then stopping blasting, in which an oxygen-containing gas is blown from a tap hole into the blast furnace after stopping blasting of the blast furnace, thereby burning coke remaining between the tuyeres and the tap hole to reduce the volume of residues inside the blast furnace; coke is newly charged into a volume-reduced area thus formed; and blasting is restated by opening the tuyeres positioned above the tap hole.
Provided is a method of producing reduced iron that can achieve both energy savings and a decrease in CO2 emissions. Atop gas circulation and reuse system is provided that includes a blowing process, a reduction process, a distribution process, a generation process, and a heating process. An amount of gas introduced into the distribution process, the generation process, and the heating process is controlled according to a CO2 conversion rate from an electrolysis reaction in the generation process.
A method for resistance spot welding for two or more steel sheets includes performing main energizing for forming a nugget, cooling, post-energizing, and holding. The cooling, the post-energizing, and the holding are performed after the main energizing. Cooling time Ct in the cooling is more than or equal to 140 ms, and holding time Ht (ms) in the holding satisfies expression (1) or expression (2) below:
A method for resistance spot welding for two or more steel sheets includes performing main energizing for forming a nugget, cooling, post-energizing, and holding. The cooling, the post-energizing, and the holding are performed after the main energizing. Cooling time Ct in the cooling is more than or equal to 140 ms, and holding time Ht (ms) in the holding satisfies expression (1) or expression (2) below:
when
Ct
≤
2
×
D
×
√
TS
-
80
,
(
1
)
D
×
√
TS
-
0.5
×
Ct
<
Ht
≤
2700
×
D
/
√
TS
+
Ct
.
when
Ct
>
2
×
D
×
√
TS
-
80
,
40
<
Ht
≤
2700
×
D
/
√
TS
+
Ct
.
(
2
)
A friction element welding method for welding a sheet set including two or more overlapping metal sheets by pressing a rotating element having a tapered portion at a tip into the sheet set. The method includes a first step of removing oxide film on an upper surface of a lower sheet and a second step of pressing the element into the lower sheet to form a welded portion. In the first step, oxide is removed while controlling the penetration ratio in the range of 0.5 to less than 1.3, rotation speed between 4000-8000 rpm, and pressurizing force between 4000-8000 N. In the second step, rotation speed is increased according to a prescribed formula based on the penetration ratio.
B23K 20/12 - Soudage non électrique par percussion ou par une autre forme de pression, avec ou sans chauffage, p. ex. revêtement ou placage la chaleur étant produite par frictionSoudage par friction
A friction element welding method for welding a sheet set that includes two or more overlapping metal sheets by pressing a rotating element having a tapered portion at a tip into the sheet set, the method includes a first step of removing a film of oxide on an upper surface of a lower sheet disposed as a lowermost layer of the sheet set, and a second step of pressing the rotating element into the lower sheet to form a welded portion.
B23K 20/12 - Soudage non électrique par percussion ou par une autre forme de pression, avec ou sans chauffage, p. ex. revêtement ou placage la chaleur étant produite par frictionSoudage par friction
Provided is a method of producing an electrical steel sheet with an insulating coating that excels in both punchability and weldability under more severe evaluation conditions. The method of producing an electrical steel sheet with an insulating coating includes a process of preparing a water-based coating material and a process of applying the water-based coating material to the surface of an electrical steel sheet and heating and drying to form an insulating coating. The water-based coating material contains resin, an inorganic component, an optional organic reductant, an optional B compound, and water. 50 mass % or more of the resin consists of one or both of emulsion resin and dispersion resin. The water-based coating material has a viscosity of 1.0 mPa·s or more.
H01F 1/18 - Aimants ou corps magnétiques, caractérisés par les matériaux magnétiques appropriésEmploi de matériaux spécifiés pour leurs propriétés magnétiques en matériaux inorganiques caractérisés par leur coercivité en matériaux magnétiques doux métaux ou alliages sous forme de feuilles avec revêtement isolant
H01F 41/32 - Appareils ou procédés spécialement adaptés à la fabrication ou à l'assemblage des aimants, des inductances ou des transformateursAppareils ou procédés spécialement adaptés à la fabrication des matériaux caractérisés par leurs propriétés magnétiques pour appliquer un matériau conducteur, isolant ou magnétique sur une pellicule magnétique
A press-formed product manufacturing method manufactures a press-formed product including a top plate and a vertical wall continuous with the top plate via a ridge, and includes: forming a metal sheet blank into an intermediate press-formed product including an intermediate top plate, and an intermediate vertical wall continuous with the intermediate top plate via an intermediate ridge, the intermediate top plate being provided with a convex/concave portion having at least a convex or concave ridge-orthogonal cross-sectional shape and extending in a direction same as an extending direction of the intermediate ridge; and crushing the convex/concave portion of the intermediate press-formed product to form the press-formed product. The crushing of the convex/concave portion generates a material flow, and the material flow pushes out a material corresponding to the intermediate ridge toward the vertical wall to cause reverse bending of a portion that has been the intermediate ridge.
Provided is a method of producing reduced iron that can achieve both energy savings and a decrease in CO2 emissions. The system is configured to circulate and reuse top gas with a blowing process, a reduction process, a distribution process, a synthesis process, and a reforming process, and the distribution ratio of the top gas in the distribution process is controlled according to consumed H2/CO, which is a ratio of the amount of H2 consumed to the amount of CO consumed in the reduction process.
In a resistance spot welded joint, two or more steel sheets including at least one high-strength steel sheet are resistance spot welded. The high-strength steel sheet has a specific chemical composition. The heat-affected zone of the resistance spot weld has a first region that has an average hardness Hv satisfying 0.85×Hvm>Hv in relation to the hardness Hvm of a nugget central portion, and the average number density of carbide particles having a size of 100 nm or more is 10 particles or more per 5 μm2 of a steel sheet cross section in the first region.
An information search system is an information search method in which an information management device executes a search process based on a search condition so as to search a database for information that matches the search condition. The search condition includes a keyword input by a searcher and one or more narrowing keywords extracted by correlation analysis with the keyword. The information management device executes the search process after receiving a selection operation for causing the searcher to select, in the search condition, whether to set the narrowing keyword as an AND condition for the keyword or whether to set the narrowing keyword as a NOT condition for the keyword.
HOT-DIP GALVANIZED STEEL SHEET, MEMBER PRODUCED USING HOT-DIP GALVANIZED STEEL SHEET, AUTOMOTIVE FRAMEWORK STRUCTURAL COMPONENT OR AUTOMOTIVE REINFORCING COMPONENT COMPRISING MEMBER, AND PRODUCTION METHODS FOR HOT-DIP GALVANIZED STEEL SHEET AND MEMBER
Provided is a hot-dip galvanized steel sheet having high strength, high ductility, high stretch flangeability and bendability, and reduced anisotropy of stretch flange fracture. The hot-dip galvanized steel sheet comprises: a base steel sheet; and a hot-dip galvanized layer formed on a surface thereof, wherein the base steel sheet includes: a predetermined chemical composition; and a microstructure at a position ¼ the sheet thickness from the surface of the base steel sheet in a depth direction in which an area ratio of martensite is 10% to 80%, an area ratio of ferrite is 20% to 90%, an area ratio of retained austenite is 10% or less, and a proportion of an area ratio of ferrite having {001} orientation to that of all ferrite is 0.50 or less, and a low-temperature-range diffusible hydrogen content in the base steel sheet is 0.015 mass ppm or less.
A travelling carriage 1 that travels on a travel surface in a travel region by means of a drive device 10. The travelling carriage 1 includes: a temperature measuring device 4 that measures temperature of a measurement subject; an image acquisition device 2 that acquires image information on the travel surface; and an arithmetic device 3 that detects the measurement subject from the image information. The arithmetic device 3 adjusts a position or an orientation of the temperature measuring device 4 based on a position of the measurement subject detected from the image information.
Provided is a steel plate that has excellent HIC resistance. The steel plate has a defined chemical composition, and in a region inward from a depth of ¼ thickness from both surfaces of the steel plate in the thickness direction, inclusions are present that have an average composition of 10 mass % to 40 mass % MgO and 10.0 mass % or less MnS, and an average MnS aspect ratio of 10 or less, and an average value of the top 10% of the circle equivalent diameters of the inclusions is 2.0 μm or less. A crack area ratio CAR after an HIC test in the region is 1.0% or less.
C21D 8/10 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de corps tubulaires
C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
C22C 38/12 - Alliages ferreux, p. ex. aciers alliés contenant du tungstène, du tantale, du molybdène, du vanadium ou du niobium
85.
PRESS-FORMED PRODUCT AND PRODUCTION METHOD OF PRESS-FORMED PRODUCT
A press-formed product wherein main and reinforcing parts join together and has good manufacturability while securing excellent collision resistance performance and rigidity, and a production method of this press-formed product. A press-formed product has at least a top plate portion and a vertical wall portion, and includes a main part that constitutes the top plate portion and the vertical wall portion and a reinforcing part that is disposed straddling the top plate portion and the vertical wall portion and joined to an inner side or an outer side of the main part. The press-formed product includes a sloping portion of a planar shape between the top plate portion and the vertical wall portion on which the reinforcing part is disposed; a joint is provided at least in the sloping portion; and the width of an inner surface of the sloping portion is wider than the width of the joint.
An object is to provide a friction element welding method. A friction element welding method performs joining of a sheet assembly including two or more stacked metal sheets by pressing an element provided with a tip angle into the sheet assembly while rotating the element. The method includes an oxide film removal step of bringing the bottom surface of the element into contact with an oxide film on the top surface of the lowermost metal sheet in the sheet assembly, and removing the oxide film. The element used in the oxide film removal step is such that the elevation angle of the tip angle of the element satisfies a predetermined conditional expression depending on the element diameter, the pressurizing force, the rotational speed, and the tensile strength of the lowermost metal sheet.
B23K 20/12 - Soudage non électrique par percussion ou par une autre forme de pression, avec ou sans chauffage, p. ex. revêtement ou placage la chaleur étant produite par frictionSoudage par friction
A resistance spot welding method is performed on a sheet combination of two or more overlapping steel sheets, which include at least one high strength steel sheet, to join the steel sheets together. The method includes a main current application step of applying a current having a current value Iw through the sheet combination to form a resistance spot weld and a post-heat treatment step including a cooling process and a heating process. The cooling process follows the main current application step and includes cooling the resistance spot weld for a cooling time tc of greater than 800 ms. The heating process follows the cooling process and includes applying a current having a current value It of 1.05×Iw≤It≤1.80×Iw through the resistance spot weld for a current application time tt of greater than 100 ms and 300 ms or less.
Provided is an electrical steel sheet with an insulating coating that suppresses cracking of the insulating coating after stress relief annealing and has excellent sticking resistance. The electrical steel sheet with an insulating coating includes an electrical steel sheet and an insulating coating formed on at least one surface of the electrical steel sheet. The insulating coating contains Zr and Mn, and a mass ratio Mn/Zr in the insulating coating is from 0.010 to 0.100.
A molten iron dephosphorization method uses a top and bottom blown converter charged with molten iron and slag, supplies the oxygen-containing gas from an inlet of a blowing main hole, and supplies a control gas from an opening toward an axial center of the blowing main hole through a control gas supply passage. A slag top-surface position measurement step includes continuously or intermittently measuring an arbitrary position in a top surface of the slag. A slag top-surface difference calculation step includes calculating a slag thickness that is a difference between the measured top-surface positions of the molten iron and the slag. A jetting condition adjustment step includes, using the obtained slag thickness, adjusting a jetting condition of the oxygen-containing gas jetted from the top-blowing lance into an appropriate range. The top-blown jetting condition is adjusted by comparing the slag thickness and the depth of a surface depression.
METHOD FOR MELTING DIRECT REDUCED IRON, SOLID IRON AND METHOD FOR PRODUCING THE SAME, AND MATERIAL FOR CIVIL ENGINEERING AND CONSTRUCTION AND METHOD FOR PRODUCING THE SAME
A technology for melting direct reduced iron while efficiently removing a gangue portion from the direct reduced iron includes melting direct reduced iron in an induction melting furnace to obtain molten iron, and slag removal step of removing slag to an outside of the induction melting furnace; and optionally includes a refining step of refining the molten iron obtained in the melting step. The melting step includes a first step of blowing a gas into the molten iron for a limited time of or throughout the melting step, and further optionally includes one or more steps selected from: 1) a second step of adding an adjuster for adjusting components of the slag, 2) a third step of supplying heat to the slag from a heat source disposed above the induction melting furnace, and 3) a fourth step of supplying one or more reducing solids and/or one or more reducing gases.
Provided is a steel plate that has excellent HIC resistance. The steel plate has a defined chemical composition, and in a pair of regions from both surfaces of the steel plate to a depth of ¼ thickness in the thickness direction, inclusions are present that have an average composition of 10 mass % to 40 mass % MgO and an average aspect ratio of 1.5 or less, and an average value of the top 10% of the circle equivalent diameters of the inclusions is 2.0 μm or less. A crack area ratio CAR after an HIC test in the pair of regions is 1.0% or less.
B21B 1/02 - Méthodes de laminage ou laminoirs pour la fabrication des produits semi-finis de section pleine ou de profilésSéquence des opérations dans les trains de laminoirsInstallation d'une usine de laminage, p. ex. groupement de cagesSuccession des passes ou des alternances de passes pour laminer de grosses pièces, p. ex. des lingots, brames, billettes dont la section droite est sans importance
C21D 6/00 - Traitement thermique des alliages ferreux
WIDTH PREDICTION METHOD OF ROUGH ROLLED MATERIAL, WIDTH CONTROL METHOD OF ROUGH ROLLED MATERIAL, MANUFACTURING METHOD OF HOT-ROLLED STEEL SHEET, AND GENERATION METHOD OF WIDTH PREDICTION MODEL OF ROUGH ROLLED MATERIAL
A width prediction method of a rough rolled material, the width prediction method predicting a width of the rough rolled material in a hot rolling line including a heating furnace configured to heat a slab, a rough rolling mill configured to manufacture the rough rolled material by performing rough rolling on the heated slab, and a finish rolling mill configured to manufacture a finished rolled material by performing finish rolling on the rough rolled material, the width prediction method includes a prediction step of predicting statistical information of a width of the rough rolled material by using a width prediction model trained by a Gaussian process regression method, the width prediction method for which an input data is data including one or more operational parameters selected from operational parameters of the rough rolling mill, and an output data is the statistical information of the width of the rough rolled material.
B21B 37/16 - Commande de l'épaisseur, de la largeur, du diamètre ou d'autres dimensions transversales
B21B 1/02 - Méthodes de laminage ou laminoirs pour la fabrication des produits semi-finis de section pleine ou de profilésSéquence des opérations dans les trains de laminoirsInstallation d'une usine de laminage, p. ex. groupement de cagesSuccession des passes ou des alternances de passes pour laminer de grosses pièces, p. ex. des lingots, brames, billettes dont la section droite est sans importance
93.
PREDICTION MODEL OF AN OXYGEN COATING WEIGHT AFTER DECARBURIZATION ANNEALING, METHOD FOR CREATING SAME, AND METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
A model predicting an oxygen coating weight after decarburization annealing is used when producing a grain-oriented electrical steel sheet by subjecting a steel material for the grain-oriented electrical steel sheet to hot rolling, hot strip annealing as necessary, cold rolling once, or cold rolling twice or more with intermediate annealing in between, and decarburization annealing, applying an annealing separating agent containing MgO as a main agent to a steel sheet surface, and then performing finishing annealing. This model is created with at least three steel material components, annealing conditions before final cold rolling, and decarburization annealing conditions set as explanatory variables, and a target variable corresponding to these explanatory variables set as the oxygen coating weight after decarburization annealing. A grain-oriented electrical steel sheet is manufactured with decarburization annealing conditions set using the prediction model thus created such that the oxygen coating weight after decarburization annealing meets a target value.
G06F 30/27 - Optimisation, vérification ou simulation de l’objet conçu utilisant l’apprentissage automatique, p. ex. l’intelligence artificielle, les réseaux neuronaux, les machines à support de vecteur [MSV] ou l’apprentissage d’un modèle
C21D 6/00 - Traitement thermique des alliages ferreux
A high-strength hot rolled steel sheet has a certain chemical composition and has a steel microstructure in which martensite and/or lower bainite is a main phase and in which the volume fraction of retained austenite is less than 3%. (The amount of solute Ti+the amount of solute Nb)/(the total amount of Ti+the total amount of Nb) is 0.300 or more and less than 0.800, and the total amount of Ti and Nb present as precipitates having a diameter of 100 nm or more is 0.010 to 0.030% by mass. In a surface layer region, the pole density of the {110}<111> orientation is 1.8 to 5.0.
A grain-oriented electrical steel sheet having excellent coating adhesion properties is provided, and methods for manufacturing the same are provided. The grain-oriented electrical steel sheet can include a forsterite coating and an insulating coating that are disposed, in this order, starting from a surface side of the steel sheet, wherein a frequency of formation of cracks propagating through the insulating coating in a region extending 100 μm toward a widthwise middle of the grain-oriented electrical steel sheet from a widthwise edge of the grain-oriented electrical steel sheet is less than or equal to 3.0 times the frequency of formation of cracks propagating through the insulating coating in a region extending toward the widthwise middle from a widthwise position more than 100 μm from the widthwise edge to a widthwise position 500 μm from the widthwise edge, where the frequency is expressed as a number per mm.
A resistance spot welded joint is formed by welding two or more steel sheets including at least one high strength steel sheet. The high strength steel sheet has a specific chemical composition, and the nugget diameter of a weld and the width of a softened portion of a heat-affected zone satisfy the relation of: width (mm) of softened portion of heat-affected zone>nugget diameter (mm)×0.2. The hardness X of a softest portion of the heat-affected zone and the hardness of the base material of the high strength steel sheet satisfy the relation of: X (HV)
A non-oriented electrical steel sheet is produced by hot-rolling a slab and then performing hot-band annealing and cold rolling thereon to obtain a cold-rolled sheet, and further performing finishing annealing. The finishing annealing is performed by setting the dew point DH is in the range from 500° C. to 800° C. in a heating zone to −20° C. or lower, and setting the dew point DS in the range from above 800° C. to the soaking temperature in the heating zone, as well as in a region where the steel sheet is in a soaking zone, to −40° C. or lower, and also controlling the dew points DH and DS so that the relationship of DH>DS is satisfied, thereby suppressing the oxidation of the surface of the steel sheet after the finishing annealing. Thus, a non-oriented electrical steel sheet with low iron loss is stably obtained as a high-grade material with a high Si content.
A method for etching steel includes a first etching process of performing electrolytic etching on steel in a basic solution having a pH of more than 7.0 and a second etching process of bringing the steel, which has been subjected to the first etching process, into contact with an acidic solution having a pH of less than 7.0.
A high-strength hot rolled steel sheet has a chemical composition containing, in % by mass, C: 0.04 to 0.18%, Si: 0.1 to 3.0%, Mn: 0.5 to 3.5%, P: more than 0% and 0.050% or less, S: more than 0% and 0.010% or less, Al: more than 0% and 1.5% or less, N: more than 0% and 0.010% or less, O: more than 0% and 0.003% or less, and Ti: 0.040 to 0.150%, with the balance being Fe and incidental impurities. The steel sheet has a steel microstructure in which bainite is a main phase and in which the volume fraction of retained austenite is less than 3%. (The amount of solute Ti/the total amount of Ti) is 0.30 or more and less than 0.80, and the amount of Ti present as precipitates having a diameter of 100 nm or more is 0.010 to 0.030% by mass.
A laser cutting method is for cutting, using a laser cutter, the vicinity of a joint (2) at which a trailing end of a preceding steel strip (1A) is joined to a leading end of a succeeding steel strip (1B), and includes an edge position detection process of detecting an edge position of the preceding steel strip and of the succeeding steel strip, a cutting track determination process, and a cutting execution process. In the cutting track, an oscillation start position of a laser is set outward from the edge position by a first predetermined distance in a width direction of the steel strip, an oscillation end position of the laser is set outward from the edge position by a second predetermined distance in the width direction of the steel strip, and a penetration angle of the laser is set to a predetermined angle or less.
B23K 31/12 - Procédés relevant de la présente sous-classe, spécialement adaptés à des objets ou des buts particuliers, mais non couverts par un seul des groupes principaux relatifs à la recherche des propriétés, p. ex. de soudabilité, des matériaux
B23K 26/067 - Division du faisceau en faisceaux multiples, p. ex. foyers multiples
B23K 26/40 - Enlèvement de matière en tenant compte des propriétés du matériau à enlever
B23K 37/02 - Chariots pour supporter l'outillage pour souder ou découper
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