Abrégé

The present invention described in the present specification relates to a stainless steel for a fuel cell separator, more specifically, a stainless steel that is for a fuel cell separator and has a low contact resistance. According to an embodiment of the stainless steel for a fuel cell separator disclosed herein, the arithmetic mean peak curvature (Ssc) of the surface defined according to the ISO 25178 standard is at least 6.0 ?m-1, the root mean square surface slope (Sdq) is at least 23, and the contact resistance is at most 10 m?·cm2.

Classes IPC  ?

• C23C 22/50 - Traitement du fer ou des alliages à base de fer
• C25D 9/10 - Revêtement électrolytique autrement qu'avec des métaux avec des matières inorganiques par des procédés cathodiques sur le fer ou l'acier
• H01M 8/021 - Alliages à base de fer
• H01M 8/0228 - Composites sous forme de produits en couches ou enrobés

Abrégé

Disclosed are a highly anticorrosive martensitic stainless steel, and a manufacturing method therefor, the steel having uniformly distributed fine chromium carbide so as to have improved corrosion resistance, and being applicable as tableware with suitable hardness when strengthened by heat treatment. A highly anticorrosive martensitic stainless steel according to one embodiment of the present invention comprises, by wt%, 0.14-0.21% of C, 0.05-0.11% of N, 0.1-0.6% of Si, 0.4-1.2% of Mn, 14.0-17.0% of Cr, 0.2-0.32% of C and N, and the balance of Fe and inevitable impurities, has a PREN value, represented by formula (1), of 16 or more, and has a chromium carbide precipitation temperature of 950°C or lower.

Classes IPC  ?

• C21D 1/26 - Méthodes de recuit
• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
• C22C 38/22 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du molybdène ou du tungstène

Abrégé

The present invention relates to a novel method for preparing lithium oxide. In the present invention, particle sizes and morphologies of lithium oxide can be controlled during the preparation process thereof. In addition, the present invention relates to lithium oxide having controlled particle sizes and morphologies, prepared by the preparation method.

Classes IPC  ?

• C01B 15/043 - Peroxydes métalliques ou leurs peroxyhydratesSuperoxydesOzonides de métaux alcalins, alcalino-terreux ou du magnésium
• C01D 15/02 - OxydesHydroxydes

Abrégé

The present invention provides a wire rod for welding rods comprising, by weight: 0.05 to 0.8% of carbon (C), 18 to 31% of manganese (Mn), 0.05 to 0.7% of silicon (Si), 0.15% or less of nitrogen (N), 0.02% or less of phosphorus (P), and 0.01% or less of sulfur (S), with a balance of Fe and unavoidable impurities, wherein the following Relations 1 and 2 are satisfied, wherein the wire rod for welding rods further comprises: one or more selected from the group consisting of 8% or less of nickel (Ni), 3.5% or less of chromium (Cr), 3.5% or less of molybdenum (Mo), and 0.3% or less of vanadium (V), wherein each element refers to a content by weight of the element. [Relation 1] Mn + 1.6Ni + 15(C+N) 24 [Relation 2] 10(C+N) + 1.5Cr + 2Mo + 1.5V - 0.lMn -0.16Ni 0.

Classes IPC  ?

• 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 35/30 - Emploi de matériaux spécifiés pour le soudage ou le brasage dont le principal constituant fond à moins de 1550 C
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène

Abrégé

The present invention relates to a wire rod used as a material for a core wire for a power line and, more specifically, to a wire rod having both high strength and a non-magnetic property, and a method for manufacturing same.

Classes IPC  ?

• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse

Abrégé

The present invention relates to austenitic stainless steel having excellent electrical conductivity in which metallic copper is formed in a non-conductive passivation film that is formed on the surface of the stainless steel, and a method for manufacturing same. Austenitic stainless steel having excellent electrical conductivity, according to one embodiment of the present invention, comprises: a stainless steel base material comprising, in percentage by weight, C: 0.1% or less, Si: 0.1% to 1.0% or less, Mn: 0.1% to 2.0% or less, Cr: 15% to 24% or less, Ni: 6% to 12% or less, Cu: 0.5% to 3% or less, and the remainder being Fe and unavoidable impurities; and a passivation film formed on the stainless steel base material, wherein the passivation film has a thickness of more than 0 nm and 5 nm or less, and the content in percentage by weight of Cu in a thickness region between 2 nm to 3 nm from the surface of the passivation film is 1.5 or more compared to the content in percentage by weight of Cu of the stainless steel base material.

Classes IPC  ?

• C22C 38/40 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel
• C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse
• C23C 22/06 - Traitement chimique de surface de matériaux métalliques par réaction de la surface avec un milieu réactif laissant des produits de réaction du matériau de la surface dans le revêtement, p. ex. revêtement par conversion, passivation des métaux au moyen de solutions aqueuses au moyen de solutions aqueuses acides d'un pH < 6

Abrégé

An embodiment of the present invention provides a high strength hot rolled steel sheet having excellent elongation and a method for manufacturing same, the high strength hot rolled steel sheet containing, in weight percentage, 0.11-0.14% of C, 0.20-0.50% of Si, 1.8-2.0% of Mn, 0.03% of less of P, 0.02% or less of S, 0.01-0.04% of Nb, 0.5-0.8% of Cr, 0.01-0.03% of Ti, 0.2-0.4% of Cu, 0.1-0.4% of Ni, 0.2-0.4% of Mo, 0.007% or less of N, 0.001-0.006% of Ca, and 0.01-0.05% of Al, with the remainder comprising Fe and inevitable impurities, wherein relational expressions 1 to 3 below are satisfied, and the microstructure includes, by area percentage, 88% or more of bainite (excluding 100%), 10% or less of ferrite (excluding 0%), 2% or less of pearlite (excluding 0%), and 0.8% or less of island martensite (including 0%). [relational expression 1] 7 = (Mo/93)/(P/31) = 16, [relational expression 2] 1.6 = Cr+3Mo+2Ni = 2, [relational expression 3] 6 = (3C/12+Mn/55)×100 = 7 (in relational expressions 1 to 3, the contents of alloying elements are based on wt%)

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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 38/42 - 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

One embodiment of the present invention provides a high strength thick steel plate for a line pipe having excellent low temperature toughness and ductility as well as a low yield ratio, and a method thereof, the steel plate comprising by weight%: 0.03 to 0.055% of C; 0.1 to 0.35% of Si; 1.7 to 2.2% of Mn; 0.01 to 0.04% of Al; 0.005 to 0.025% of Ti; 0.008% or less of N; 0.08 to 0.12% of Nb; 0.2 to 0.45% of Cr; 0.2 to 0.35% of Ni; 0.05 to 0.3% of Cu; 0.2 to 0.4% of Mo; 0.02% or less of P; 0.002% or less of S; 0.0005 to 0.004% of Ca; 0.01 to 0.04% of V; 0.0005% or less of B; and residual Fe and other unavoidable impurities, and satisfying relational expressions 1 to 4, wherein the microstructure thereof comprises by area%: 1 to 5% of polygonal ferrite; 60 to 75% of acicular ferrite; 20 to 30% of bainitic ferrite; and 5% or less of island martensite. [Relational expression 1] 19 = (Mo/96)/(P/31) = 30 [Relational expression 2] 1.42 = Cr+2Mo+Cu+Ni+1000B = 1.75 [Relational expression 3] 4 < {3C/12 + Mn/55}×100 = 4.9 [Relational expression 4] 600 = 400C+6800Nb+600V+800Ti+300Al = 820 (wherein the content of the alloying elements described in the relational expressions 1 to 4 is by % by weight.)

Classes IPC  ?

• C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The steel comprises: a stainless base material comprising, in percent (%) by weight of the entire composition, C: 0.02% or less, excluding 0, N: 0.02% or less excluding 0, Si: 0.5% or less, excluding 0, Mn: 0.3% or less , excluding 0, Cr: 16 to 20%, the remainder substantially iron (Fe); and a passivation film formed on the stainless base material. The Cr weight % content of the thickness region from the surface of the passivation film to 3 nm is 1.2 times or more and 2.0 times or less than the Cr weight % content of the stainless base material. Selective dissolution of Fe on the surface of stainless steel occurs. The ferritic stainless steel has a pitting potential of 330mV or more when immersed in 1M NaCl solution at room temperature and the pitting potential at a potential scanning rate of 20 mV/min.

Classes IPC  ?

• 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 38/40 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel
• 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
• C25D 11/38 - Chromatage

Abrégé

A high-strength steel plate having excellent fracture toughness and elongation ratio according an aspect of the present invention comprises, by weight%, 0.05-0.1% of carbon (C), 0.05-0.5% of silicon (Si), 1.4-2.0% of manganese (Mn), 0.01-0.05% of aluminum (Al), 0.005-0.02% of titanium (Ti), 0.002-0.01% of nitrogen (N), 0.04-0.07% of niobium (Nb), 0.05-0.3% of chromium (Cr), 0.05-0.4% of nickel (Ni), 0.02% or less of phosphorus (P), 0.005% or less of sulfur (S), 0.0005-0.004% of calcium (Ca), and the remainder of iron (Fe) and unavoidable impurities, wherein a microstructure includes 20-60 area% of ferrite and bainite, and the grain size of the upper 80% of the high-angle grain sizes based on 15 degrees in the centre of the steel plate may be 70 ? or less.

Classes IPC  ?

• 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 38/44 - 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The present invention relates to a steel plate which can appropriately be used as a structural material and the like. Provided are a steel plate, exhibiting excellent strength and toughness on a heat affected zone even when high heat input welding is performed, and a method for manufacturing thereof.

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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

Abrégé

Provided are a steel plate for a pressure vessel with excellent cryogenic toughness and excellent ductility, and a manufacturing method thereof. The steel plate for a pressure vessel of the present invention comprises, in weight%, 0.05 to 0.15% of C; 0.20 to 0.40% of Si; 0.3 to 0.6% of Mn; 0.001 to 0.05% of Al; 0.012% or less of P; 0.015% or less of S; 4.0 to 5.0% of Ni; 0.001 to 0.10% of In; and the balance being Fe and unavoidable impurities, wherein a steel microstructure consists of 15 to 80 area% of tempered bainite and the balance being tempered martensite.

Classes IPC  ?

• 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

Abrégé

One embodiment of the present invention provides an abrasion resistant steel having excellent hardness and impact toughness, and a manufacturing method therefor, the abrasion resistant steel comprising, by wt%, 0.33-0.42% of carbon (C), 0.1-0.7% of silicon (Si), 0.6-1.6% of manganese (Mn), 0.05% or less of phosphorus (P) (excluding 0), 0.02% or less of sulfur (S) (excluding 0), 0.07% or less of aluminum (Al) (excluding 0), 0.55-5.0% of nickel (Ni), 0.01-1.5% of copper (Cu), 0.01-0.8% of chromium (Cr), 0.01-0.8% of molybdenum (Mo), 50 ppm or less of boron (B) (excluding 0), and 0.02% or less of cobalt (Co) (excluding 0), further comprising one or more selected from the group consisting of 0.02% or less of titanium (Ti) (excluding 0), 0.05% or less of niobium (Nb) (excluding 0), 0.05% or less of vanadium (V) (excluding 0) and 2-100 ppm of calcium (Ca), and comprising the balance of Fe and other inevitable impurities, wherein C and Ni satisfy the following relation 1, and the microstructure comprises 95 area% or more of martensite and 5% or less of bainite (including 0%). [Relation 1] [C]×[Ni] = 0.231

Classes IPC  ?

• 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 38/52 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cobalt
• 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

Abrégé

An aspect of the present invention provides: a steel for a pressure vessel, the steel having excellent surface quality while having excellent strength and toughness even after a long-term post-weld heat treatment (PWHT); and a method for manufacturing same.

Classes IPC  ?

• C21D 9/50 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour joints de soudure
• 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 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre

Abrégé

One embodiment of the present invention comprises: an electrical steel sheet material; and an insulating coating which is on one or both sides of the electrical steel sheet material, wherein the insulating coating comprises a silane compound and a metal hydroxide.

Classes IPC  ?

• 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 7/14 - Procédés, autres que le flocage, spécialement adaptés pour appliquer des liquides ou d'autres matériaux fluides, à des surfaces particulières, ou pour appliquer des liquides ou d'autres matériaux fluides particuliers à du métal, p. ex. à des carrosseries de voiture
• B05D 7/24 - Procédés, autres que le flocage, spécialement adaptés pour appliquer des liquides ou d'autres matériaux fluides, à des surfaces particulières, ou pour appliquer des liquides ou d'autres matériaux fluides particuliers pour appliquer des liquides ou d'autres matériaux fluides particuliers
• C09D 4/00 - Compositions de revêtement, p. ex. peintures, vernis ou vernis-laques, à base de composés non macromoléculaires organiques ayant au moins une liaison non saturée carbone-carbone polymérisable
• C09D 7/40 - Adjuvants
• C09D 7/61 - Adjuvants non macromoléculaires inorganiques
• C23C 22/24 - Traitement chimique de surface de matériaux métalliques par réaction de la surface avec un milieu réactif laissant des produits de réaction du matériau de la surface dans le revêtement, p. ex. revêtement par conversion, passivation des métaux au moyen de solutions aqueuses au moyen de solutions aqueuses acides d'un pH < 6 contenant des composés du chrome hexavalent

Abrégé

Disclosed is a method for manufacturing stainless steel for a polymer fuel cell separator having excellent contact resistance. A method for manufacturing stainless steel for a polymer fuel cell separator having excellent contact resistance according to an embodiment of the present invention comprises: an electrolysis step of removing a first passive film formed on a stainless steel cold-rolled thin plate, the plate containing, in wt%, C: more than 0 to 0.02%, N: more than 0 to 0.02%, Si: more than 0 to 0.25%, Mn: more than 0 to 0.2%, P: more than 0 to 0.04%, S: more than 0 to 0.02%, Cr: 22 to 34%, Ti: more than 0 to 0.5%, Nb: more than 0 to 0.5%, and the balance Fe and other inevitable impurities; and a step of immersing the stainless steel plate in a mixed solution of nitric acid and hydrofluoric acid to form a second passive film on the stainless thin plate.

Classes IPC  ?

• C22C 38/22 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du molybdène ou du tungstène
• C22C 38/24 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du vanadium
• C22C 38/28 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du titane ou du zirconium
• C23C 22/06 - Traitement chimique de surface de matériaux métalliques par réaction de la surface avec un milieu réactif laissant des produits de réaction du matériau de la surface dans le revêtement, p. ex. revêtement par conversion, passivation des métaux au moyen de solutions aqueuses au moyen de solutions aqueuses acides d'un pH < 6
• C23C 22/78 - Pré-traitement du matériau à revêtir
• C25F 1/06 - DécapageEnlèvement de battitures en solution de fer ou d'acier
• H01M 8/021 - Alliages à base de fer

Abrégé

A steel material for a low yield ratio, high-strength steel pipe having excellent low-temperature toughness according to an aspect of the present invention comprises, by weight %, 0.03-0.065% of C, 0.05-0.3% of Si, 1.7-2.2% of Mn, 0.01-0.04% of Al, 0.005-0.025% of Ti, 0.008% or less of N, 0.08-0.12% of Nb, 0.02% or less of P, 0.002% or less of S, 0.05-0.3% of Cr, 0.4-0.9% of Ni, 0.3-0.5% of Mo, 0.05-0.3% of Cu, 0.0005-0.006% of Ca, 0.001-0.04% of V, and the balance of Fe and inevitable impurities, wherein a number of deposits having an average diameter of 20 nm or less per unit area in the cross section of the steel material may be 6.5*109/mm2 or greater.

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
• 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The present invention relates to a steel material to which post weld heat treatment (PWHT) is applied after pipe making and, more specifically, to a steel material that maintains excellent low-temperature toughness even after undergoing a PWHT process, a steel material which is obtained therefrom, and which has undergone PWHT, and a method for manufacturing the same.

Classes IPC  ?

• C21D 8/06 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de barres ou de fils
• 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 38/44 - 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The present invention provides: a high manganese steel for a low temperature; and a manufacturing method therefor, the high manganese steel comprising 0.3-0.8 wt% of C, 18-26 wt% of Mn, 0.01-1 wt% of Si, 0.01-0.5 wt% of Al, 0.1 wt% or less of Ti (excluding 0%), 1-4.5 wt% of Cr, 0.1-0.9 wt% of Cu, 0.03 wt% or less of S (excluding 0%), 0.3 wt% or less of P (excluding 0%), 0.001-0.03 wt% of N, 0.004 wt% or less of B (excluding 0%), and the balance of Fe and other inevitable impurities, wherein the microstructure is a single-phase austenitic structure, and the grain size of the austenitic structure is 50 µm or less.

Classes IPC  ?

• C21D 9/00 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet
• C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
• C22C 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
• C22C 38/28 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du titane ou du zirconium
• C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse

Abrégé

The present invention relates to a method for producing a coal briquette, and a coal briquette produced by the method, the method comprising the steps of: preparing base materials comprising pulverized coal and dextrin; producing a mixture by mixing the base materials; aging the mixture; and molding the aged mixture to produce a coal briquette, wherein a generation of a low melting point compound is suppressed while molten iron is produced, such that damage to facilities caused by a deposit can be prevented.

Classes IPC  ?

• C10B 53/04 - Distillation destructive spécialement conçue pour des matières premières solides particulières ou sous forme spéciale de charbon pulvérulent
• C10L 5/04 - Matière première à utiliserSon prétraitement
• C10L 5/14 - Procédés de fabrication de briquettes avec l'aide de liants, p. ex. des liants prétraités avec des liants organiques

Abrégé

The present invention relates to a steel material for a welded steel pipe having excellent longitudinal uniform elongation, the steel material comprising, by wt%, carbon (C): 0.02 to 0.07%, silicon (Si): 0.05 to 0.3%, manganese (Mn): 0.8 to 1.8%, aluminum (Al): 0.005 to 0.05%, nitrogen (N): 0.001 to 0.01%, phosphorus (P): 0.020% or less, sulfur (S): 0.003% or less, nickel (Ni): 0.05 to 0.3%, chromium (Cr): 0.05 to 0.5%, niobium (Nb): 0.01 to 0.1%, and a balance of iron (Fe) and inevitable impurities, wherein 20 to 50% of polygonal ferrite by area fraction, a low-temperature transformation phase, and a second phase are included as a microstructure, the low-temperature transformation phase is acicular ferrite and bainite, and wherein the acicular ferrite is included in an amount of 20 % to 40% by area fraction, a manufacturing method therefor, and a steel pipe using the same.

Classes IPC  ?

• 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 38/44 - 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The purpose of one aspect of the present invention is to provide: a thick steel sheet capable of removing a conventional normalizing treatment required for ensuring toughness low temperature and cryogenic environments, and having physical properties equal to or better than those of a conventional steel subjected to the normalizing treatment; and a method for manufacturing the method.

Classes IPC  ?

• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/12 - Alliages ferreux, p. ex. aciers alliés contenant du tungstène, du tantale, du molybdène, du vanadium ou du niobium

Abrégé

The objective of one aspect of the present invention is to provide: a thick steel sheet having high strength and high toughness without carrying out accelerated cooling using water cooling, in the manufacturing, by means of a thermo-mechanical control process (TMCP), of a thick steel having a thickness of 15 mmt or more; and a method for manufacturing the same.

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• C21D 9/46 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet pour tôles
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• 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 38/46 - 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The present invention relates to a steel material for pressure vessels used in a hydrogen sulfide atmosphere, and relates to a steel material for pressure vessels which has excellent resistance to hydrogen induced cracking (HIC) and a manufacturing method thereof.

Classes IPC  ?

• C21D 1/28 - Normalisation
• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
• C22C 38/40 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel
• 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

An aspect of the present invention relates to a high-strength steel material, having enhanced resistance to brittle crack propagation and break initiation at a low temperature, which comprises in weight % 0.02-0.09% of C, 0.005-0.3% of Si, 0.5-1.7% of Mn, 0.001-0.035% of Sol.Al, 0.03% or less of Nb (not including 0%), 0.01% or less of V (not including 0%), 0.001-0.02% of Ti, 0.01-1.0% of Cu, 0.01-2.0% of Ni, 0.01-0.5% of Cr, 0.001-0.5% of Mo, 0.0002-0.005% of Ca, 0.001-0.006% of N, 0.02% or less of P (not including 0%), 0.003% or less of S (not including 0%) and 0.002% or less of O (not including 0%) with a balance of Fe, and inevitable impurities, satisfies relational expression (1) below, has a microstructure comprising polygonal ferrite and needle-shaped ferrite of the total of 50 area % or greater, and comprises 3.5 area % or less of a martensite-austenite (MA) composite. Relational expression (1): 5*C + Si + 10*sol.Al = 0.6 (In relational expression (1), each symbol for the element is a value indicating each element content in weight %.)

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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 38/40 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel
• 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

Abrégé

Provided according to one preferred aspect of the present invention are austenitic steel material having superb abrasion resistance and toughness, and a method for producing the austenite steel material. The austenitic steel material comprises, in wt%, 0.6-1.9% carbon (C); 12-22% manganese (Mn); 5% or lower (excluding 0%) chromium (Cr); 5% or lower (excluding 0%) copper (Cu); 0.5% or lower (excluding 0%) aluminum (Al); 1.0% or lower (excluding 0%) silicon (Si); 0.1% or lower (including 0%) phosphorous (P); 0.02% or lower (including 0%) sulfur (S); and the rest in Fe and unavoidable impurities, and has the microstructure comprising, by surface area fraction, 97% or higher (including 100%) austenite and 3% or lower (including 0%) carbide.

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
• C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse

Abrégé

An aspect of the present invention relates to a high-strength steel material, having enhanced resistance to brittle crack propagation and break initiation at a low temperature, which comprises in weight % 0.01-0.07% of C, 0.002-0.2% of Si, 1.7-2.5% of Mn, 0.001-0.035% of Sol.Al, 0.03% or less of Nb (not including 0%), 0.01% or less of V (not including 0%), 0.001-0.02% of Ti, 0.01-1.0% of Cu, 0.01-2.0% of Ni, 0.01-0.5% of Cr, 0.001-0.5% of Mo, 0.0002-0.005% of Ca, 0.001-0.006% of N, 0.02% or less of P (not including 0%), 0.003% or less of S (not including 0%) and 0.0025% or less of O (not including 0%) with a balance of Fe, and inevitable impurities, satisfies relational expression (1) below, has a microstructure comprising polygonal ferrite and needle-shaped ferrite of the total of 30 area % or greater, and comprises 3.0 area % or less of a martensite-austenite (MA) composite. Relational expression (1): 5*C + Si + 10*sol.Al = 0.5 (In relational expression (1), each symbol for the element is a value indicating each element content in weight %.)

Classes IPC  ?

• C21D 1/18 - DurcissementTrempe avec ou sans revenu ultérieur
• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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 38/44 - 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

The present invention relates to pressure vessel steel to be used in a hydrogen sulfide atmosphere, and relates to pressure vessel steel having excellent resistance to hydrogen induced cracking (HIC), and a manufacturing method therefor.

Classes IPC  ?

• B21B 1/22 - 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 des bandes ou des feuilles en longueurs indéfinies
• B21B 3/02 - Laminage des alliages ferreux particuliers
• B21B 37/74 - Commande de la température, p. ex. en refroidissant ou en chauffant les cylindres ou le produit
• 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 38/40 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel
• 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

Abrégé

Disclosed is an austenitic material having excellent hydrogen-embrittlement resistance, comprising, by weight, 0.1-0.5% of C, 5% or less (0% exclusive) of Cu, 1% or less (0% exclusive) of N, a content of Mn satisfying Mn=-10.7C+24.5, 10% or less of Cr, 5% or less of Ni, 5% or less of Mo, 4% or less of Si, 5% or less of Al, and a balance amount of Fe and inevitable impurities, with a T-El2/T-El1 ratio of 0.5 or higher, wherein T-El1 is an elongation at break according to a tensile test at 25ºC under an atmospheric condition of 1 atm and T-El2is an elongation at break according to a tensile test at 25 ºC under a hydrogen condition of 70 MPa.

Classes IPC  ?

• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre

Abrégé

The present invention relates to a thick steel plate having excellent low-temperature toughness and hydrogen-induced cracking resistance, and a method for manufacturing the same. The thick steel plate comprises: one or two kinds of C of 0.02-0.08 weight%, Si of 0.1-0.5 weight%, Mn of 0.8-2.0 weight%, P of 0.03 weight% or less, S of 0.003 weight% or less, Al of 0.06 weight% or less, N of 0.01 weight% or less, Nb of 0.005-0.1 weight%, Ti of 0.005-0.05 weight%, Ca of 0.0005-0.005 weight%, Cu of 0.005-0.3%, and Ni of 0.005-0.5%; and one or more kinds of Cr of 0.05-0.5 weight%, Mo of 0.02-0.4 weight%, and V of 0.005-0.1 weight%; and the balance being Fe and other unavoidable impurities, wherein a carbon equivalent (Ceq) value satisfies 0.45 or less as defined by relational expression 1 below: [relational expression 1] a carbon equivalent (Ceq) = C + Mn/6 + (Cr + Mo + V)/5 + (Cu + Ni)/15 (wherein C, Mn, Cr, Mo, V, Cu, and Ni represent the content of each element by weight%), wherein the weight ratio of Ca/S satisfies a range between 0.5 and 5.0 and tempered bainite (including tempered acicular ferrite) or tempered martensite is included as a matrix structure, and wherein the length of the longest side of a Ti-based, Nb-based, or Ti-Nb complex carbonitride, in which the upper and lower portions thereof is 5 mm or less, is 10 µm or less based on the center in the thickness direction.

Classes IPC  ?

• B21B 3/00 - Laminage des matériaux faits d'alliages particuliers dans la mesure où la nature de l'alliage exige ou permet l'emploi de méthodes ou de séquences particulières
• C21D 6/00 - Traitement thermique des alliages ferreux
• C22C 38/00 - Alliages ferreux, p. ex. aciers alliés
• 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 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

An aspect of the present invention relates to a low-yield ratio and high-strength steel having excellent stress corrosion cracking resistance and low temperature toughness, the steel comprising, by weight, 0.02-0.10% of carbon (C), 0.5-2.0% of manganese (Mn), 0.05-0.5% of silicon (Si), 0.05-1.0% of nickel (Ni), 0.005-0.1% of titanium (Ti), 0.005-0.5% of aluminum (Al), 0.005% or less of niobium (Nb), 0.015% or less of phosphorus (P), 0.015% or less of sulfur (S), and the balanced amount of Fe and inevitable impurities, the microstructure of which comprises, by area, 60% or more of acicular ferrite and a balanced amount of one or more phases of bainite, polygonal ferrite and martensite-austenite constituent (MA).

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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

Abrégé

An aspect of the present invention is to provide: a steel material for a pressure vessel, the steel material having excellent resistance to hydrogen induced cracking (HIC) in a hydrogen sulfide atmosphere, while having excellent moldability and high strength, by optimizing the component composition and manufacturing conditions of steel; and a manufacturing method therefor. According to one aspect of the present invention, there are provided a steel material having excellent hydrogen induced cracking (HIC) resistance for a pressure vessel and a manufacturing method therefor, wherein the steel material comprises: one or two of, in terms of wt%, 0.10-0.25% of carbon (C), 0.05-0.50% of silicon (Si), 1.0-2.0% of manganese (Mn), 0.005-0.1% of aluminum (Al), 0.010% or less of phosphorous (P), 0.0015% or less of sulfur (S), 30-70 ppm of nitrogen (N), 0.001-0.03% of titanium (Ti), 0.02-0.50% of copper (Cu), 0.05-0.50% of nickel (Ni), 0.0005-0.0040% of calcium (Ca), 0.001-0.03% of niobium (Nb), 0.001-0.03% of vanadium (V), 0.01-0.20% of chromium (Cr), 0.05-0.15% of molybdenum (Mo), and the balance Fe and other unavoidable impurities, the microstructure comprising at least 40 vol% of air-cooled bainite and the remainder ferrite, Nb (C, N) carbonitrides with a diameter of 5-30 nm being contained in 0.01 wt% or more. According to the present invention, a steel material having excellent hydrogen induced cracking (HIC) resistance for a pressure vessel can be obtained.

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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

Abrégé

Stainless steel for a fuel cell separator plate and a manufacturing method therefor are disclosed. The stainless steel for a fuel cell separator plate, according to one embodiment of the present invention, comprises: a stainless base material; and a passive film formed on the stainless base material, wherein a Cr/Fe atomic weight ratio in a 1nm or less thickness region of the stainless base material, which is adjacent to an interface between the stainless and the passive film, is 0.45 or more. Therefore, by modifying the surface of the stainless steel for a fuel cell separator plate, a low interface contact resistance and a good corrosion resistance can be obtained, and a separate additional process such as precious metal coating can be removed, such that manufacturing costs are reduced and productivity can be improved.

Classes IPC  ?

• H01M 8/021 - Alliages à base de fer
• H01M 8/0228 - Composites sous forme de produits en couches ou enrobés

Abrégé

An aspect of the present invention relates to a steel for low-temperature service having an excellent surface processing quality, the steel sheet for low-temperature service containing manganese (Mn, 15-35 wt%), carbon (C, satisfying 23.6C + Mn .gtoreq.28 and 33.5C - Mn .ltoreq. 23), copper (Cu, 5 wt% or less (excluding0 wt%)), chrome (Cr, satisfying 28.5C + 4.4Cr .ltoreq. 57 (excluding0 wt%)), titanium (Ti, 0.01-0.5 wt%), nitrogen (N, 0.003-0.2 wt%), the balance iron (Fe), and other inevitable impurities, wherein Ti and N satisfy relational expression 1 below.[Relational expression 1] 1.0 .ltoreq. Ti/N .ltoreq. 4.5 (provided that, Mn,C, Cr, Ti, and N in the respective expressions mean wt% of respective ingredient contents).

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• C22C 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
• C22C 38/28 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du titane ou du zirconium
• C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse

Abrégé

A steel having excellent weldability and impact toughness in a welding zone is disclosed. The steel comprises by weight (wt. ) %, carbon (C) : 0.1% to 0.3%, manganese (Mn) : 11% to 13%, iron (Fe) as a residual component thereof, and other inevitable impurities . It also comprises positive and negative segregation zones in a layered form, wherein the positive segregation zone comprises austenite of 50% or more and epsilon martensite as a remainder, and the negative segregation zone comprises, by area fraction, epsilon martensite of less than 5% and alpha martensite. The steel composition and microstructure are controlled, thereby improving thephysical properties and the impact toughness of a welding zone.

Classes IPC  ?

• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse

Abrégé

A coating agent for an electrical steel sheet and a manufacturing method therefor are disclosed. A coating agent for an electrical steel sheet according to an example embodiment of the present invention includes a metal phosphate derivative solution, colloid silica, chromium oxide, and solid silica, and a solvent, wherein the metal phosphate derivative is a single material of a magnesium phosphate derivative or a mixed material of an aluminum phosphate derivative and a magnesium phosphate derivative, and in the mixed material, an amount of aluminum phosphate derivative is 10 wt% or less (not including 0%).

Classes IPC  ?

• C23C 22/07 - Traitement chimique de surface de matériaux métalliques par réaction de la surface avec un milieu réactif laissant des produits de réaction du matériau de la surface dans le revêtement, p. ex. revêtement par conversion, passivation des métaux au moyen de solutions aqueuses au moyen de solutions aqueuses acides d'un pH < 6 contenant des phosphates

Abrégé

The present invention relates to a welding material for submerged arc welding and gas metal arc welding, having remarkable impact resistance and abrasion resistance. One embodiment of the present invention provides a welding material for submerged arc welding and gas metal arc welding, having remarkable impact resistance and abrasion resistance, comprising: 0.12-0.75 wt% of C; 0.2-1.2 wt% of Si; 15-27 wt% of Mn; 2-7 wt% of Cr; 0.025 wt% or less of S; 0.020 wt% or less of P; and the balance of Fe and other inevitable impurities. According to the present invention, provided is a welding joint having remarkable weldability, low temperature impact toughness and abrasion resistance, and thus provided is a welding material for submerged arc welding and gas metal arc welding very preferably applied to the manufacture of pipes used in the oil sand industry field and the like.

Classes IPC  ?

• B23K 35/30 - Emploi de matériaux spécifiés pour le soudage ou le brasage dont le principal constituant fond à moins de 1550 C
• 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

Abrégé

The present invention relates to a welding joint having remarkable impact resistance and abrasion resistance. One embodiment of the present invention provides a welding joint having remarkable impact resistance and abrasion resistance, comprising 0.02-0.75 wt% of C, 0.2-1.2 wt% of Si, 15-27 wt% of Mn, 2-7 wt% of Cr, 0.025 wt% or less of S, 0.025 wt% or less of P, 0.001-0.4 wt% of N, and the balance of Fe and other inevitable impurities, and having a stacking-fault energy of 15-40 mJ/m2 at 20°C. According to the present invention, provided is a welding joint having remarkable low temperature impact toughness and abrasion resistance, and thus provided is a welding joint very preferably applied to a slurry pipe and the like used in the oil sand industry field related to oil production.

Classes IPC  ?

• B23K 35/30 - Emploi de matériaux spécifiés pour le soudage ou le brasage dont le principal constituant fond à moins de 1550 C
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome

Abrégé

The present invention relates to a flux-cored arc welding material having remarkable impact resistance and abrasion resistance. One embodiment of the present invention provides a flux-cored arc welding material having remarkable impact resistance and abrasion resistance, comprising: 0.1-0.75 wt% of C; 0.2-1.2 wt% of Si; 15-27 wt% of Mn; 2-7 wt% of Cr; 0.01 wt% or less of S; 0.018 wt% or less of P; 4.3-15 wt% of TiO2; 0.01-9 wt% of at least one selected from the group consisting of SiO2, ZrO2 and Al2O3; and the balance of Fe and other inevitable impurities. According to the present invention, provided is a welding joint capable of all-position welding and having remarkable weldability, low temperature impact toughness and abrasion resistance, and thus provided is a welding material very preferably applied to the manufacture of pipes used in the oil sand industry field and the like.

Classes IPC  ?

• B23K 35/30 - Emploi de matériaux spécifiés pour le soudage ou le brasage dont le principal constituant fond à moins de 1550 C
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome

Abrégé

The present invention relates to steel which can be applied to heavy construction equipment, dump trucks, mining machinery, conveyors and the like and, more specifically, to high-manganese wear resistant steel having excellent weldability.

Classes IPC  ?

• C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse

Abrégé

Steel with sufficient toughness, even at a low gas temperature, is required for manufacturing gas tanks capable of bearing high pressure and resist external impacts. The invention proposes a steel sheet and its method of manufacture, useful for making such gas tanks, e.g. for storage of 002. The steel sheet comprises 0.02-0.12 wt% carbon, 0.5-2.0 wt% manganese, 0.05-0.5 wt% silicon, 0.05-1.0 wt% nickel, 0.005-0.1 wt% titanium, 0.005-0.5 wt% aluminum, 0.015 wt% or less phosphorus, 0.015 wt% or less sulfur, and the balance of Fe and other inevitable impurities. The steel sheet has a microstructure including 70%-90% of ferrite and 10%-30% of a mixed structure of martensite and austenite by area fraction, and a yield ratio (YS/TS) of 0.8 or less. The ferrite has a crystal grain size of 10 .mu.m or less and the mixed structure of martensite and austenite has an average grain size of 5 .mu.m or less.

Classes IPC  ?

• 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 38/14 - Alliages ferreux, p. ex. aciers alliés contenant du titane ou du zirconium

Abrégé

The present invention relates to a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone and a preparation method therefor. One embodiment of the present invention provides: a high strength austenitic-based steel with remarkable toughness of a welding heat-affected zone, comprising 0.8-1.5 wt% of C, 15-22 wt% of Mn, 5 wt% or less of Cr (except 0), and the balance of Fe and other inevitable impurities, and further comprising at least one of the following (a) and (b), wherein the microstructure of a welding heat-affected zone comprises 90 % or more of austenite by volume fraction; and a preparation method therefor. (a) Mo: 0.1-1 % and B: 0.001-0.02 % (b) Ti: 0.01-0.3 % and N: 0.003-0.1 %

Classes IPC  ?

• C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse

Abrégé

According to the present invention, provided are a welded joint of extremely low-temperature steel and flux cored, submerged, and gas metal arc welding materials which can be used to prepare the welded joint, wherein the welded joint of extremely low-temperature steel has outstanding impact toughness in extremely low-temperature conditions and excellent yield strength at room temperature.

Classes IPC  ?

• B23K 35/24 - Emploi de matériaux spécifiés pour le soudage ou le brasage
• C22C 30/00 - Alliages contenant moins de 50% en poids de chaque constituant
• C22C 38/40 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel
• C22C 38/58 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et plus de 1,5% en poids de manganèse

Abrégé

According to the present invention, a submerged and gas metal arc welding material comprising a core and an outer sheath surrounding the core are provided. The submerged and gas metal arc welding material comprises, by wt%, carbon (C): 0.05% to 1.20%, silicon (Si): 0.3% to 1.2%, manganese (Mn): 3% to 25%, at least one selected from phosphorus (P) and sulfur (S): 0.03% or less, nickel (Ni): 25% to 50%, aluminum (Al): 1.5% or less, and the balance of iron (Fe) and inevitable impurities, wherein the outer sheath comprises, by wt%, nickel (Ni): 35% to 46%, other impurities: 0.05% or less, and the balance of iron (Fe).

Classes IPC  ?

• B23K 35/24 - Emploi de matériaux spécifiés pour le soudage ou le brasage
• C22C 19/03 - Alliages à base de nickel ou de cobalt, seuls ou ensemble à base de nickel
• C22C 30/00 - Alliages contenant moins de 50% en poids de chaque constituant
• C22C 38/08 - Alliages ferreux, p. ex. aciers alliés contenant du nickel

Abrégé

According to the present invention, a flux cored arc welding material comprising a core and an outer sheath surrounding the core are provided. The flux cored arc welding material comprises, by wt%, carbon (C): 0.05% to 1.30%, silicon (Si): 0.2% to 1.8%, manganese (Mn): 0.5% to 25%, at least one selected from phosphorus (P) and sulfur (S): less than 0.031%, nickel (Ni): 25% to 50%, aluminum (Al): 1.5% or less, Ti02: 3.5% to 15%, at least one selected from potassium (K), sodium (Na), and lithium (Li): 0.01% to 1.3%, titanium (Ti): 2.4% or less, at least one selected from molybdenum (Mo), tungsten (W), and cobalt (Co): 0.001% to 10%, and the balance of iron (Fe) and inevitable impurities. The outer sheath comprises, by wt%, nickel (Ni): 35% to 46%, other impurities: 0.05% or less, and the balance of iron (Fe).

Classes IPC  ?

• B23K 35/24 - Emploi de matériaux spécifiés pour le soudage ou le brasage
• C22C 19/03 - Alliages à base de nickel ou de cobalt, seuls ou ensemble à base de nickel
• C22C 30/00 - Alliages contenant moins de 50% en poids de chaque constituant
• C22C 38/08 - Alliages ferreux, p. ex. aciers alliés contenant du nickel

Abrégé

The present invention relates to a ferrite-based stainless steel having superior moldability when molding a divider sheet made from a material for a fuel cell by controlling yield point elongation in accordance with alloy ingredients, and to a method for manufacturing the ferrite-based stainless steel. The ferrite-based stainless steel according to the present invention comprises, in weight percentages: no more than 0.02% of C; no more than 0.02% of N; no more than 0.4% of Si; no more than 0.2% of Mn; no more than 0.04% of P; no more than 0.02% of S; 25.0-32.0% of Cr; 0-1.0% of Cu; no more than 0.8% of Ni; no more than 0.01-0.5% of Ti; no more than 0.01-0.5% of Nb; no more than 0.01-1.5% of V; and residual Fe and inevitable elements, wherein the content of Ti, Nb, V, C, and N in terms of weight % of steel uses formula (1) to render a yield point elongation of the material of no more than 1.1%, and wherein a steel material has superior moldability. (1) 9.1C-1.76V+5.37(C+N)/Ti - 1.22Nb = 0.7

Classes IPC  ?

• C21D 8/02 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de produits plats ou de bandes
• 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 38/46 - 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
• H01M 8/021 - Alliages à base de fer

Abrégé

The invention discloses a method and an apparatus for treating process water which is loaded with gaseous compounds and/or possibly with solids and comes from a wet-cleaning installation for cleaning process gas, e.g. from a melt-reduction subassembly or from a direct-reduction subassembly. Process water is introduced in a tank (1) in a first process stage and degassed on the basis of reduced solubility of the dissolved compounds. The tank (1) has, on its upper side, a gas-collecting chamber (1), in which the separated-off gases are collected and from which these are discharged. Likewise, the treated process water is discharged from the tank via a drainage means.

Classes IPC  ?

• C02F 1/20 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par dégazage, c.-à-d. par libération des gaz dissous

Abrégé

In one aspect of the present invention, provided is an austenite steel material having superior ductility, comprising, as percentages by weight, from 8 to 15% of manganese (Mn) and no more than 3% (excluding 0%) of copper (Cu), and having a carbon (C) content satisfying both 33.5C+Mn=25 and 33.5C-Mn=23, and comprising a balance of iron and unavoidable impurities; wherein ductility and abrasion resistance can be improved while at the same time also ensuring superior economic viability as the austenite is stabilised and the occurrence of carbides in network form at austenite grain boundaries is suppressed as a result of the addition of Cu, which is more advantageous in suppressing the formation of carbides than is manganese, and appropriate control of the carbon and manganese contents.

Classes IPC  ?

• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome

Abrégé

There are provided a ferrite stainless steel and a preparation method thereof. The stainless steel includes C: 0.02wt% or less, N: 0.02wt% or less, Si: 0.4wt% or less, Mn: 0.2wt% or less, P: 0.04wt% or less, S:0.02wt% or less. Cr: 25.0 to 32.0wt%, Cu: 0 to 2.0wt%, Ni: 0.8wt% or less, Ti: 0.5wt% or less, Nb: 0.5wt% or less, waste Fe and inevitable impurities. The preparation method includes forming a first passive film by bright-annealing or annealing-pickling removing the first passive film by pickling the stainless steel; water-washing; and forming the second passive film by performing a passivation treatment. Accordingly, a stainless steel having reduced elution resistance and excellent corrosion resistance is provided. Used as a polymer fuel cell separator, it has low interfacial contact resistance and excellent long-term performance even under a fuel cell operating condition of 60 to 150.degree.C and various surface roughness conditions.

Classes IPC  ?

• C22C 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome
• C23C 22/17 - Orthophosphates contenant des cations du zinc et des acides organiques
• C23G 1/02 - Nettoyage ou décapage de matériaux métalliques au moyen de solutions ou de sels fondus avec des solutions acides
• C23G 1/08 - Fer ou acier

Abrégé

The present invention relates to a reduction furnace including a charging device that is capable of preventing segregation and an apparatus for manufacturing molten iron including the same. The reduction furnace for reducing an iron-containing material used for manufacturingmolten iron may include a charging hole where the iron-containing material is charged, a first guide plate sloped toward a first direction in the reduction furnace to guide the iron-containing material to the inside of the reduction furnace, and a second guide plate fixed and sloped toward a second direction intersecting the first direction in the reduction furnace to guide the iron-containing material dropped and guided by the first guide plate. A dropping direction of the iron-containing material dropped and guided by the first guide plate is changed when the iron-containingmaterial is guided by the second guide plate.

Classes IPC  ?

• C21B 11/00 - Fabrication de la fonte brute autrement que dans les hauts fourneaux

Abrégé

The present invention provides a tubular torsion beam for rear suspensions of vehicles, which is produced according to a more durable design capable of improving roll stiffness and roll strength of the tubular torsion beam. The tubular torsion beam is produced by pressure-forming a tubular steel member through hydroforming such that the tubular torsion beam has a cross-section varying along an entire length thereof, with opposite ends having a closed cross-section and mounted to respective trailing arms, a middle portion having a V-shaped open cross-section, and a transitional portion having a varying cross-section and connecting the middle portion to each of the opposite ends. During the process of manufacturing the tubular torsion beam, the opposite ends of the tubular steel member are fed using respective axial punches of a hydroforming machine, so that the opposite ends are thicker than the middle portion.

Classes IPC  ?

• B60G 11/18 - Suspensions élastiques caractérisées par la disposition, l'emplacement ou le type des ressorts ayant des ressorts à barre de torsion uniquement

Abrégé

The present invention relates to a method for manufacturing molten iron that improves charging and discharge of the fine iron ore, and an apparatus for manufacturing molten iron using the same. The apparatus for manufacturing molten iron according to an embodiment of the present invention includes i) at least one fluidized-bed reduction reactor that reduces fine iron ore and converts the fine iron ore into reduced iron, ii) a fine iron ore charging bin that supplies the fine iron ore to the fluidized-bed reduction reactor, iii) a fine iron ore charging line that directly connects the fine iron ore charging bin to each of the fluidized-bed reduction reactors, and directly charges the fine iron ore into each of the fluidized-bed reduction reactor, iv) a melter-gasifier into which lumped carbonaceous materials and the reduced iron are charged and oxygen is injected, the melter-gasifier manufacturing molten iron, and v) a reducing gas supply line that supplies a reducing gas discharged from the melter-gasifier to the fluidized-bed reduction reactor.

Classes IPC  ?

• C21B 13/00 - Fabrication de fer spongieux ou d'acier liquide par des procédés directs

Abrégé

The present invention relates to an apparatus for manufacturing compacted
irons of the reduced materials containing fine reduce irons and an apparatus
for manufacturing molten irons provided with the same. The apparatus for
manufacturing compacted irons according to the present invention includes a
couple of rollers for compacting reduced materials containing fine reduced
irons and manufacturing compacted irons, a guide chute for guiding compacted
irons which are discharged from the couple of rollers; and crushers for
crushing compacted irons which are guided into the guide chute. A guiding
surface of the guide chute, which guides the compacted irons, includes a
straight slanted surface and a curved slanted surface.

Classes IPC  ?

• C21B 13/00 - Fabrication de fer spongieux ou d'acier liquide par des procédés directs
• C22B 1/24 - AgglutinationBriquetage
• C22B 5/00 - Procédés généraux de réduction appliqués aux métaux

Abrégé

The present invention relates to an apparatus for manufacturing molten iron
by injecting fine carbonaceous materials into a melter-gasifier and a method
for
manufacturing molten iron using the same. The method for manufacturing molten
iron according to the present invention includes steps of reducing mixtures
containing iron ores in a reduction reactor and converting the mixtures
containing
iron ores into reduced materials, preparing lumped carbonaceous materials
containing volatile matters as a heating source for melting the reduced
materials,
charging the lumped carbonaceous materials into a dome-shaped upper portion of

a melter-gasifier and forming a coal packed bed, preparing fine carbonaceous
materials containing volatile matters as a heating source for melting the
reduced
materials, injecting oxygen and the fine carbonaceous materials into the coal
packed bed through a tuyere installed in the melter-gasifier, charging the
reduced
materials into the melter-gasifier connected to the reduction reactor and
manufacturing molten iron, and supplying reducing gas in the melter-gasifier
made
from volatile matters contained both in the lumped carbonaceous materials and
the
fine carbonaceous materials to the reduction reactor.

Classes IPC  ?

• C21B 13/00 - Fabrication de fer spongieux ou d'acier liquide par des procédés directs

Abrégé

The present invention relates to an apparatus for manufacturing compacted
irons and an apparatus for manufacturing molten irons using the same. The
apparatus for manufacturing compacted irons according to the present invention
includes a charging hopper into which reduced materials containing fine
reduced irons are charged, screw feeders installed inside the charging hopper
to make an acute angle with a vertical direction and discharging the reduced
materials containing fine reduced irons which enter into the charging hopper,
and a couple of rolls separated from each other to form a gap between the
rolls. The couple of rolls compact the reduced materials containing fine
reduced irons discharged from the charging hopper by the screw feeders and
manufacture compacted irons. Each screw feeder is arranged side by side along
an axis direction of the couple of rolls and an extension of the center axis
of each screw feeder passes through the gap.

Classes IPC  ?

• B22F 3/03 - Presses de moulage à cet effet
• B30B 3/04 - Presses caractérisées par l'emploi d'organes de pression rotatifs, p. ex. rouleaux, anneaux, disques les organes rotatifs coopérant entre eux, p. ex. cônes associés
• B30B 11/16 - Presses spécialement adaptées à la fabrication d'objets à partir d'un matériau en grains ou à l'état plastique, p. ex. presses à briquettes ou presses à tablettes utilisant des rouleaux, p. ex. utilisant deux rouleaux alvéolés associés
• B30B 11/24 - Presses d'extrusionMatrices pour ces presses utilisant des vis
• B30B 15/30 - Alimentation des presses en matériau

Abrégé

The present invention relates to a bioadhesive derived from mussel. In
particular, it relates to a novel Mytilus galloprovincialis foot protein type
5 (MGFP-5) and a recombinant protein that is a hybrid of MGFP-5 and foot
protein type 1 (FP-1), where an adhesive protein with adhesive activity can be
economically mass-produced to be used in place of chemical adhesives through
the present invention.

Classes IPC  ?

• C07K 14/435 - Peptides ayant plus de 20 amino-acidesGastrinesSomatostatinesMélanotropinesLeurs dérivés provenant d'animauxPeptides ayant plus de 20 amino-acidesGastrinesSomatostatinesMélanotropinesLeurs dérivés provenant d'humains
• C12N 15/12 - Gènes codant pour des protéines animales