Abrégé

Disclosed in the present invention is a long-service-life blast furnace. By optimizing the design of parts such as a bosh and a belly, and the design of a copper stave body, the objective of reducing damage to a copper stave is achieved, and safe and stable production of the blast furnace is maintained. The problem of short service life of blast furnaces caused by disappearance of hot-face bosses of copper staves and stave deformation due to different furnace charges in the blast furnaces having different degrees of damage to the copper staves is solved.

Classes IPC  ?

• C21B 7/10 - RefroidissementDispositifs à cet effet

Abrégé

A high-quality free-cutting die steel cast billet and a manufacturing method therefor, belonging to the field of steelmaking methods. The mass percentage of element S in the steel cast billet is 0.05%-0.15%. The manufacturing method comprises: blast furnace smelting, converter smelting, LF furnace refining, RH furnace refining, slab continuous casting, and insulation pit slow cooling processes. The present invention obtains high-sulfur-content and high-purity molten steel during the converter and refining processes, controls brittle inclusions in the molten steel, reduces the total content and the size of oxide inclusions, and uses optimization design of continuous casting process parameters, so as to achieve composition and structure homogenization as well as the surface and internal quality enhancement of cast billets, thereby producing high-cleanliness and high-quality free-cutting alloy die steel cast billets.

Classes IPC  ?

• C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse
• C22C 38/22 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du molybdène ou du tungstène
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
• C21C 5/36 - Procédés donnant des laitiers de composition particulière
• C21C 7/00 - Traitement à l'état liquide des alliages ferreux, p. ex. des aciers, non couverts par les groupes
• B22D 11/111 - Traitement du métal liquide en utilisant des poudres de protection
• B22D 11/22 - Commande ou régulation des opérations ou du fonctionnement du refroidissement des barres coulées ou des moules
• B22D 11/16 - Commande ou régulation des opérations ou du fonctionnement

Abrégé

12342222+HCl is used as an acid pickling solution in a third stage.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
• C21D 8/12 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication d'objets à propriétés électromagnétiques particulières

Abrégé

High-cleanliness high-carbon steel and a low-carbon-emission production method therefor. The high-cleanliness high-carbon steel comprises the following components in percentage by mass: 0.5-1.0% of C, less than or equal to 0.006% of P, and less than or equal to 0.0030% of N. The low-carbon-emission production method for the steel comprises the steps of smelting in an electric furnace, RH vacuum processing, bloom continuous casting, cogging and grinding, high-speed wire rolling, Stelmor air cooling, and finished product wire rod obtaining. The present invention achieves the control objectives of low C emission, low gas content, low impurity elements, and high cleanliness under the condition of a high steel scrap ratio.

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 38/24 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du vanadium
• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C21C 5/52 - Fabrication de l'acier au four électrique
• C21C 7/064 - DéphosphorationDésulfuration
• C21C 7/068 - Décarburation
• 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
• B22D 11/11 - Traitement du métal liquide

Abrégé

The present invention belongs to the technical field of steelmaking. Disclosed are a high-purity high-carbon steel wire rod and a production method therefor. In addition to alloying elements and Fe, the high-purity high-carbon steel wire rod further comprises the following chemical components in percentage by mass: C: 0.5-1.0%, P≤0.008%, S≤0.0025%, T.O≤0.0010%, N≤0.0020%, H≤0.0002%, Alt≤0.0010%, and Ti≤0.0005%. The production method comprises: hot-metal pretreatment, converter smelting, RH vacuum treatment, continuous casting of large billets, cogging and grinding, high-speed wire rolling, Stelmor air cooling, and obtainment of a finished wire rod. In the present invention, highly homogenized casting blanks and high-quality wire rods are obtained, and high-purity base materials are provided for high-end wire rod products. Provided in the present invention are a high-purity high-carbon steel wire rod and a production method therefor, which can be used for producing highly homogenized wire rod products having high cleanliness.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C21C 5/28 - Fabrication d'acier dans des convertisseurs
• C22C 38/00 - Alliages ferreux, p. ex. aciers alliés

Abrégé

Method for producing steel strip used in twin-roll continuous casting machine, involves hot rolling steel strip having cooled edges in hot rolling mill and reducing thickness of steel strip, cooling steel strip in cooling station, and winding steel strip on a coiler.

Classes IPC  ?

• B22D 11/06 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules dont les parois se déplacent, p. ex. entre des rouleaux, des plaques, des courroies, des chenilles

Abrégé

A method for controlling foreign material embedded in the surfaces of the thin steel strip comprises any one or more than one of the following steps: (1) controlling production of molten steel: controlling an oxygen blowing amount of a refining furnace to be at 15-18 m3and controlling a quantity of the molten steel in a tundish to be above 15 tonnes; (2) controlling a hot box atmosphere between a twin roll caster and a hot rolling mill: controlling a nitrogen flow rate in the hot box to be not less than 2500 m3/h, and controlling a total flow rate of compressed air in the hot box to be as follows: when rolling thin steel strip with a gauge over 1.2 mm, the total flow rate of the compressed air is controlled to be less than 100 m3/h; or, when rolling thin steel strip with a gauge of 1.2 mm and below, the total flow rate of the compressed air is controlled not to exceed 350 m3/h.

Classes IPC  ?

• B21B 37/00 - Dispositifs ou procédés de commande spécialement adaptés aux laminoirs ou aux produits laminés

Abrégé

A method for stabilizing carbon content of molten steel in a ladle in a refining furnace that treats molten steel in a "ladle metallurgy" process is disclosed. The method comprises melting solid slag (if any) before heating molten steel using electrically-powered electrodes in the refining furnace. The method also comprises controlling the flow rate of argon into a bottom section of the ladle to a target flow rate of argon of 100-200 L/min while the molten steel is being heated using electrically-powered electrodes in the refining furnace to reduce scouring, i.e., abrading, of electrodes by flow of the molten steel and foamed slag past the electrodes. The method also comprises adding lime in batches to molten steel.

Classes IPC  ?

• C21C 7/072 - Traitement par des gaz
• C21C 7/00 - Traitement à l'état liquide des alliages ferreux, p. ex. des aciers, non couverts par les groupes
• C21C 7/10 - Travail sous vide

Abrégé

Disclosed in the present invention is a method for producing a steel strip for a battery case. The steel strip for a battery case comprises the following chemical components in percentage by mass: carbon: 0.003-0.006%, silicon: ≤0.03%, manganese: 0.35-0.45%, titanium: 0.040-0.050%, aluminum: 0.040-0.060%, phosphorus: ≤0.020%, sulfur: ≤0.012%, nitrogen: ≤0.0040%, and the balance of iron and other inevitable impurities, wherein 7>Ti/(C+N)>5. The process flow of the production is as follows: pretreatment of hot metal → converter smelting → LF refining → RH treatment → continuous pouring → hot rolling → acid pickling → cold rolling → continuous annealing → finishing. In the present invention, by means of designing the chemical components, the Δr value of strip steel is reduced, and the isotropy and machinability of the strip steel are improved; and by means of the process, precise control over steel components and effective control over the amount and size of inclusions in the steel are achieved, the amount of inclusions in a shallow surface layer of a casting blank is reduced, the peeling depth is reduced or peeling is avoided, and the yield is increased.

Classes IPC  ?

• C21C 7/00 - Traitement à l'état liquide des alliages ferreux, p. ex. des aciers, non couverts par les groupes
• C21C 7/10 - Travail sous vide
• C21C 7/076 - Emploi de scories ou de flux comme agents traitants
• C22C 33/04 - Fabrication des alliages ferreux par fusion
• 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 38/00 - Alliages ferreux, p. ex. aciers alliés
• C22C 38/14 - Alliages ferreux, p. ex. aciers alliés contenant du titane ou du zirconium

Abrégé

The invention belongs to the technical field of steel production and discloses a method for reducing the occurrence probability of cracked weathering steel from twin-roll thin strip casting. The chemical composition of molten steel of the invention comprises, by mass percentage: C: ≤0.03-0.009*Si-0.01*Si*Mn-0.0015*Mn-0.013*Cu; Mn: 0.4-1.0%; Si: 0.2-0.4%; Cu: 0.25-0.4%; Cr: 0.3-0.5%; P: 0.07-0.18%; S: ≤0.003%; O: 0.004-0.008%; H≤0.0005%. By optimizing the chemical composition and casting and rolling process of weathering steel, the crack judgment rate of weathering steel from twin-roll thin strip casting is reduced to no more than 1.0%.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• B22D 11/06 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules dont les parois se déplacent, p. ex. entre des rouleaux, des plaques, des courroies, des chenilles
• B22D 11/12 - Accessoires pour le traitement ultérieur ou le travail sur place des barres coulées
• 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 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome
• C22C 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
• C22C 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre

Abrégé

A method for ameliorating roll marks on the surface of ultrathin strip steel. By adjusting the thickness of a cast strip to 1.8-2.0 mm, the crown of the cast strip to 35-80 μm, the temperature of the cast strip to 1050-1200°C, the air flow of a hot chamber to 100-200 m3/h, the tension of the front strip steel of a rolling mill to 2.0-3.5 MPa, the rolling starting reduction to 15-25%, and the rolling starting reduction rate to 0.6-0.9 mm/s, the roll mark defect of the ultrathin strip steel produced by twin-roll casting is at least ameliorated, and even avoided.

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 37/16 - Commande de l'épaisseur, de la largeur, du diamètre ou d'autres dimensions transversales
• B21B 37/28 - Commande de la planéité ou du profil pendant le laminage de bandes, de feuilles ou de tôles
• B21B 37/48 - Commande de la tensionCommande de la compression
• B21B 37/76 - Commande du refroidissement sur la table de sortie

Abrégé

Provided in the present invention is a device for ameliorating roller marks formed on a surface of thin strip steel by pinch rollers. In the design of the device, a local cooling beam is provided at the entrance or exit of pinch rollers to spray liquid nitrogen in the local thermal expansion region of the pinch rollers for cooling, so as to ameliorate local thermal expansion of the pinch rollers in order to adjust the roller gap and pressure between the pinch rollers, thereby reducing roller mark defects formed by the pinch rollers. In addition, further provided in the present invention is a method for alleviating pinch roller marks on hot-rolled thin strip steel during double-roller casting and rolling production. By means of the device and method for ameliorating roller marks formed on a surface of thin strip steel by pinch rollers, the rejection rate of thin strip steel products can be effectively reduced, and the qualification rate and profitability of thin strip steel products are improved.

Classes IPC  ?

• B21B 39/02 - Avance du matériau ou soutien de celui-ciSystèmes de freinage ou de tension
• B21B 39/10 - Disposition ou installation de rouleaux amenant le matériau aux cages de laminoirs
• B21B 28/00 - Maintenance des cylindres ou du matériel de laminage en état de fonctionnement
• F25D 3/11 - Dispositifs utilisant d'autres agents froidsDispositifs utilisant des récipients conservant le froid utilisant des gaz liquéfiés, p. ex. de l'air liquide avec transporteurs faisant traverser la chambre de refroidissement aux produits à refroidir
• F25D 29/00 - Disposition ou montage de l'appareillage de commande ou de sécurité

Abrégé

A method for mitigating local high points of the plate shape of a hot-rolled thin steel strip. A thin strip continuous casting key component is controlled, and the plate shape of a cast strip formed by twin roll continuous casting is controlled, so that the purpose of controlling local high points of a one-pass hot-rolled thin steel strip is achieved, and the plate shape profile of the thin steel strip and the surface quality of a steel coil are improved. In a casting process, the surface flatness of roll brushes, the bristle density and hardness of the roll brushes, and the dynamic balance value, rotating speed, and torque of the roll brushes are controlled, the sediment uniformity on the surfaces of casting rolls in a twin-roll continuous casting process is controlled, and the casting force in the twin-roll continuous casting process is controlled, so that the effects of eliminating local high points of a continuous cast strip and improving the smoothness of the plate shape profile of a cast strip are achieved, and thus the defects of local high points of the plate shape profile of the hot-rolled thin steel strip and ribs formed on the surface of the steel coil are eliminated. The plate shape quality and the coil shape quality of thin steel strips can be improved, and the qualification rate of products can be improved.

Classes IPC  ?

• B22D 11/06 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules dont les parois se déplacent, p. ex. entre des rouleaux, des plaques, des courroies, des chenilles
• B22D 11/16 - Commande ou régulation des opérations ou du fonctionnement
• B22D 11/00 - Coulée continue des métaux, c.-à-d. en longueur indéfinie
• B22D 43/00 - Décrassage mécanique, p. ex. raclage du métal liquide
• B21B 1/46 - 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 du métal immédiatement après la coulée continue
• B21B 1/00 - 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
• B21B 38/02 - Procédés ou dispositifs de mesure spécialement adaptés aux laminoirs, p. ex. détection de la position, inspection du produit pour mesurer la planéité ou le profil des bandes
• B21B 38/00 - Procédés ou dispositifs de mesure spécialement adaptés aux laminoirs, p. ex. détection de la position, inspection du produit
• B08B 1/00 - Nettoyage par des procédés impliquant l'utilisation d'outils

Abrégé

33fffff-20°C again; and after that, unstacking and air-cooling.

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 38/22 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du molybdène ou du tungstène
• C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène

Abrégé

A non-oriented silicon steel and a production method therefor. The production method: performing steelmaking according to 0.8-1.1% of Si and 0.2-0.4% of Mn, and making a blank without adding Sn and Sb; heating the casting blank to 1060-1120°C and keeping the temperature for more than 150 min, then rolling into an intermediate blank having the thickness of 40-45 mm, then performing finish rolling, and rolling to obtain a hot rolled coil having the thickness of 3.00 ± 0.25 mm, wherein the finish rolling temperature is less than or equal to 872°C+1000*(11*[Si]-14*[Mn]+21*[Al]), the finish rolling temperature is less than or equal to 820°C and the coiling temperature is less than or equal to 560°C; and normalizing and acid continuous rolling to obtain a cold hard roll having the thickness of 0.500 ± 0.005 mm, and the normal temperature of 850-900°C. The annealing temperature of the finished product is 820-880°C, and annealing, cooling, coating and finishing are performed to obtain the non-oriented silicon steel.

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
• 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

Abrégé

Disclosed in the present invention are a 400 MPa-grade corrosion-resistant steel bar and a production method therefor. The steel bar comprises the following chemical components: chromium: 9.5-10.4%, molybdenum: 1.0-1.2%, manganese: 0.3-0.6%, nickel: 0.01-1%, copper: 0.01-0.5%, carbon ≤ 0.014%, nitrogen ≤ 0.004%, niobium: 0.01-0.05%, silicon: 0.2-0.6%, chromium + molybdenum + 0.5 manganese + 0.35 nickel + 0.25 copper being 11.1-12.2%, carbon + nitrogen + 0.3 silicon + manganese + 1.8 niobium being 0.4-0.8%, the remainder being iron.

Classes IPC  ?

• C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
• C22C 38/48 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du niobium ou du tantale
• C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
• C22C 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
• 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 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
• C21D 8/08 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de barres ou de fils pour fer à béton

Abrégé

Disclosed are a high-strength steel bar and a production method therefor. The high-strength steel bar comprises, by mass percentage, the following chemical components: C: 0.15-0.32%, Si+Mn: 0.5-1.9%, Mn+Cr+Mo+Ni: 1.1-2.1%, V: 0.02-0.8%, at least one of Nb, Ti and Al: 0.01-0.3%, and the balance of Fe and inevitable impurities; wherein Mn=(2.5-3.5)Si, and a carbon equivalent satisfies Ceq=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15≤0.56%.

Classes IPC  ?

• C21D 9/00 - Traitement thermique, p. ex. recuit, durcissement, trempe ou revenu, adapté à des objets particuliersFours à cet effet
• B22D 11/115 - Traitement du métal liquide en utilisant des moyens agitateurs ou vibrants en utilisant des champs magnétiques
• C21D 6/00 - Traitement thermique des alliages ferreux
• 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 38/02 - 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 38/46 - 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

Abrégé

Disclosed are high-grade non-oriented silicon steel and a production method therefor. The chemical composition of the non-oriented silicon steel comprises, according to mass percentage: C: 0.002–0.004%, S≤0.003%, Si: 1.4–1.7%, Mn: 0.7–0.95%, P≤0.03%, and Sn: 0.015–0.035%, wherein 11×([Si]-1.4%)＝14×([Mn]-0.7%). In the production method for the non-oriented silicon steel, the continuous casting blank heating temperature is 1120–1150°C, the finishing rolling temperature is 890±15°C, the downward-pressing amount of the final instance of finishing rolling is ≥30%, the total downward-pressing amount of the last two instances of finishing rolling is ≥50%, and the coiling temperature is 650±20°C. It is not necessary to perform a normalization treatment before acid continuous rolling, and the obtained non-oriented silicon steel has good magnetic properties, has no corrugation defects on the surface, and meets the requirements of low-cost high-grade non-oriented silicon steel.

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
• C21D 8/12 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication d'objets à propriétés électromagnétiques particulières
• C22C 33/04 - Fabrication des alliages ferreux par fusion

Abrégé

A wire rod for a 5000 MPa grade diamond wire and a production method therefor. The chemical composition of the wire rod comprises in mass percentage: carbon: 1.01 to 1.1%, silicon: 0.15 to 0.4%, manganese: 0.3 to 0.6%, chromium: 0.01 to 0.4%, boron: 0.0005 to 0.002% and/or vanadium: 0.01 to 0.09%; and the balance being iron and impurities, the impurities comprising aluminium ≤ 0.003%, titanium ≤ 0.0008%, sulphur ≤ 0.005%, phosphorus ≤ 0.008%, oxygen ≤ 0.001% and nitrogen ≤ 0.002%. The production method comprises vacuum melting, electroslag remelting and/or vacuum self-consumption, grinding after cogging/forging, rolling and cooling of a high speed wire rod, and initial rolling at 1030-1060 °C. The wire rod has a uniform structure and a tensile strength greater than or equal to 1320 MPa, and can be used for preparing a 5000 Mpa grade diamond wire of 40 to 46μm.

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 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome
• C21D 6/00 - Traitement thermique des alliages ferreux

Abrégé

1.5/5050005000≥1.75, and the RH refining requires no desulfurization treatment.

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 33/06 - Fabrication des alliages ferreux par fusion en utilisant des alliages-mère
• C21D 8/12 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication d'objets à propriétés électromagnétiques particulières
• C21C 1/02 - Déphosphoration ou désulfuration

Abrégé

A double-roll casting and rolling production method of hot-rolled thin strip steel is disclosed. The method comprises at least one of the following steps: 1) controlling the convexity of the casted strip in the range of 15-60μm; 2) controlling the thickness of the casted strip in the range of 1.65-1.8 mm; 3) controlling the temperature of the casted strip in the range of 1150-1350°C; 4) controlling the pressure of the pinch roller in the range of 16KN-20KN; 5) controlling the tension of the pinch roller in the range of 2.1MPa-2.5MPa; and 6) controlling the evacuation time of the wrapper in the range of 5-10 seconds. A hot-rolled thin strip steel is disclosed. The method can effectively improve the wrinkle of the strip steel.

Classes IPC  ?

• B22D 11/06 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules dont les parois se déplacent, p. ex. entre des rouleaux, des plaques, des courroies, des chenilles
• B22D 11/16 - Commande ou régulation des opérations ou du fonctionnement
• B22D 11/20 - Commande ou régulation des opérations ou du fonctionnement du retrait des barres coulées

Abrégé

A method for improving the surface quality of a twin roll cast and hot rolled thin strip steel is disclosed. The method comprises: (a) designing a quadratic curve for a full length L of a body of a pinch roll; (b)determining a region H where pinch roll marks on a twin roll cast and hot rolled thin strip steel is formed with a pinch roll having the quadratic curve in step (a); (c) designing a sextic curve in the region H; (d) determining the roll shape curve for the full length L of the pinch roll body.

Classes IPC  ?

• B21B 37/30 - Commande de la planéité ou du profil pendant le laminage de bandes, de feuilles ou de tôles utilisant une commande du bombé des cylindres
• G06F 30/17 - Conception mécanique paramétrique ou variationnelle
• G06F 17/11 - Opérations mathématiques complexes pour la résolution d'équations

Abrégé

A boron-added steel and a continuous twin roll strip casting method thereof is disclosed. The steel has a composition of C ≤ 0.10 wt. %, Mn ≤ 2.50 wt. %, Si ≤ 1.50 wt. %, and B ≤ 0.01 wt. % and small concentrations of other elements that are present as deliberate additions and/or unavoidable impurities. Each casting roll is divided into a plurality, typically five, regions along the length of the roll and has different surface textures, such as formed as a pattern of projections in the surface. Where there are five regions, (a) each edge region 1, 5 has a width of ≤40 mm, an arithmetic mean deviation of projections forming the texture of ≤6μm, and an average pitch of projections forming the texture of ≤350 μm, (b) each transition region 2, 4 has a width of ≤20 mm, and (c) a middle region 3 has an arithmetic mean deviation of projections forming the texture of 9-25 μm, and an average pitch of projections forming the texture of 300-850 μm.

Classes IPC  ?

• C22C 33/04 - Fabrication des alliages ferreux par fusion
• 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
• 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

Abrégé

A method of twin-roll casting a boron-added steel having a composition of C: ≤ 0.03 wt. %, Si:≤ 0.3 wt. %, Mn: 0.3-0.8 wt. %, P: ≤0.02 wt. %, N:≤ 0.008 wt. %, S:≤ 0.003 wt. %, B: 0.0008-0.0015 wt. %, the balance being Fe and unavoidable impurities. The method includes the steps of: smelting the steel composition; strip casting the molten steel into a cast strip through a twin-roll caster; online one-pass hot rolling the cast strip into a hot-rolled strip with a certain thickness with a reduction of 25-60%; obtaining a steel strip with a polygonal ferrite microstructure after cooling and coiling. The boron-added steel has a tensile strength of at least 270 MPa and an elongation of at least 21%.

Classes IPC  ?

• B21B 1/46 - 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 du métal immédiatement après la coulée continue

Abrégé

Disclosed are a resource recovery method and a resource recovery system (100) for desulfurization ash. The resource recovery method comprises: water washing desulfurization ash and performing solid-liquid separation to obtain a solid state residue enriched with calcium sulfite and calcium sulfate and a solution enriched with calcium hydroxide; preparing the solution into a desulfurization slurry; and calcining the solid state residue under the action of a reducing agent to obtain a flue gas enriched with sulfur dioxide and a residue enriched with calcium oxide.

Classes IPC  ?

• B01D 53/78 - Procédés en phase liquide avec un contact gaz-liquide
• B01D 53/48 - Composés du soufre
• F23G 7/00 - Procédés ou appareils, p. ex. incinérateurs, spécialement adaptés à la combustion de déchets particuliers ou de combustibles pauvres, p. ex. des produits chimiques
• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• B09B 5/00 - Opérations non couvertes par une seule autre sous-classe ou par un seul autre groupe de la présente sous-classe

Abrégé

A wire rod for an ultrahigh-strength steel cord and a manufacturing method therefor. The method comprises: smelting molten steel in which the number density of inclusions having a size of greater than or equal to 5 μm is less than or equal to 0.5/mm2, and the inclusion size is less than or equal to 30 μm; casting the molten steel into an ingot blank having a central carbon segregation value of 0.92-1.08; blooming the ingot blank into an intermediate billet having a central carbon segregation value of 0.95-1.05; rolling the intermediate billet into a wire rod; and cooling the wire rod at controlled temperature to obtain a wire rod having high cleanliness, high homogeneity and a tensile strength of less than or equal to 1150 MPa. The wire rod can be used for an ultrahigh-strength steel cord having a single-filament tensile strength of greater than or equal to 3600 MPa.

Classes IPC  ?

• 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
• C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium
• C22C 38/48 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du niobium ou du tantale
• C22C 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
• C22C 38/44 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du molybdène ou du tungstène
• C22C 38/42 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du cuivre
• C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
• C22C 38/04 - Alliages ferreux, p. ex. aciers alliés contenant du manganèse
• C22C 38/02 - Alliages ferreux, p. ex. aciers alliés contenant du silicium
• C22C 33/04 - Fabrication des alliages ferreux par fusion
• C21C 7/064 - DéphosphorationDésulfuration
• C21C 7/068 - Décarburation
• C21C 7/10 - Travail sous vide
• 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
• B21B 1/46 - 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 du métal immédiatement après la coulée continue
• B21B 45/00 - Dispositifs pour le traitement de surface des pièces spécialement combinés aux laminoirs, disposés dans les laminoirs, ou adaptés pour être utilisés avec les laminoirs
• B21B 37/74 - Commande de la température, p. ex. en refroidissant ou en chauffant les cylindres ou le produit
• B21B 37/48 - Commande de la tensionCommande de la compression
• B21B 37/00 - Dispositifs ou procédés de commande spécialement adaptés aux laminoirs ou aux produits laminés

Abrégé

Provided are a superfine extra-high-strength steel wire, a steel wire rod for the superfine extra-high-strength steel wire, and a production method thereof. The chemical components of the steel wire rod for the superfine extra-high-strength steel wire includes in percentage by mass: 0.90 to 0.96 percent of C, 0.12 to 0.30 percent of Si, 0.30 to 0.65 percent of Mn, 0.10 to 0.30 percent of Cr, less than or equal to 0.004 percent of Al, less than or equal to 0.001 percent of Ti, less than or equal to 0.01 percent of Cu, less than or equal to 0.01 percent of Ni, less than or equal to 0.01 percent of S, less than or equal to 0.01 percent of P, less than or equal to 0.0006 percent of O, less than or equal to 0.0006 percent of N, and the balance Fe and inevitable impurity elements. The steel wire rod for the superfine extra-high-strength steel wire can be used as base material for producing the superfine extra-high-strength steel wire with the diameter being 50 to 60μm and the tensile strength being larger than or equal to 4500 MPa.

Classes IPC  ?

• C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium

Abrégé

Disclosed are a high-strength steel bar and a production method therefor. The chemical components of the high-strength steel bar comprise, in mass percentage, 0.15-0.32% of C, 0.5-1.9% of Si+Mn, 1.1-2.1% of Mn+Cr+Mo+Ni, 0.02-0.8% of V, and 0.01-0.3% of at least one of Nb, Ti and Al, with the balance being Fe and inevitable impurities, wherein Mn=(2.5-3.5)Si, and carbon equivalent Ceq=C+Mn/6+(Cr+Mo +V)/5+(Cu+Ni)/15≤0.56%.

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 38/44 - 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 38/46 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du vanadium
• C22C 38/50 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du titane ou du zirconium
• C22C 38/06 - Alliages ferreux, p. ex. aciers alliés contenant de l'aluminium
• C22C 38/54 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du nickel et du bore
• C21C 7/072 - Traitement par des gaz
• C21D 8/08 - Modification des propriétés physiques par déformation en combinaison avec, ou suivie par, un traitement thermique pendant la fabrication de barres ou de fils pour fer à béton

Abrégé

A high-strength weather-proof thin steel strip and a production method therefor. The method comprises the following steps: smelting, wherein components and percentages in weight thereof comprised in the steel are respectively: C: ≤ 0.03; Si: 0.10-0.40; Mn: 1.50-2.00; P: ≤ 0.015; S: ≤ 0.003; Cr: ≤ 0.50; Cu: 0.20-1.00%; and Nb: 0.05-0.50, and the balance being iron and unavoidable impurities; continuous casting of a thin strip: performing continuous casting on molten steel qualified by the smelting to form a cast strip having a thickness of 1.4-2.5 mm by using a pair of casting rollers rotating in opposite directions, wherein the molten steel overheating temperature is controlled to be 100°C or below; online hot rolling of the cast strip, wherein the first-pass hot rolling reduction is 15-65%, and the temperature of the strip steel before entering a rolling mill is 950°C or above; and cooling and coiling: cooling the hot-rolled strip steel to 450-650°C by means of aerosol to obtain acicular ferrite and a small amount of pearlite structures, and then coiling the thin steel strip into a roll by a coiling machine.

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 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
• C22C 38/26 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du niobium ou du tantale
• C22C 38/38 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et plus de 1,5% en poids de manganèse
• 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

Abrégé

A method for reducing the rolling force of a twin roll casting production line rolling mill. The method comprises: qualified molten steel is smelted by a converter or an electric furnace and passed through a tundish, a transitional container, and counter-rotating copper casting rollers to form casted strands of a certain thickness, a certain volume of air and a certain volume of nitrogen are introduced into hot vessel #3 of a twin roll casting production line, the content of air can be controlled independently on the upper and lower surfaces so that an extremely thin oxidized layer is provided on the surfaces of the casted strands; which are hot-rolled, then cooled, and rolled into rolls. By means of the method, the oxide layer provided on the surfaces of the casted strands increases lubrication on the surfaces of the casted strands, thus reducing rolling force and extending the service life of the rollers.

Classes IPC  ?

• B21B 1/46 - 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 du métal immédiatement après la coulée continue
• B22D 11/06 - Coulée continue des métaux, c.-à-d. en longueur indéfinie dans des moules dont les parois se déplacent, p. ex. entre des rouleaux, des plaques, des courroies, des chenilles

Abrégé

Low-cost weathering steel and a production method thereof. The weathering steel comprises components of: less than or equal to 0.03 of C, 0.10-0.50 of Si, 0.50-1.50 of Mn, 0.07-1.50 of P, less than or equal to 0.008 of N, less than or equal to 0.003 of S, less than 0.40 of Cu, less than 0.45 of Cr, and the balance being Fe and inevitable impurities; The protection method comprises the following steps: smelting; carrying out thin-strip continuous casting; continuously casting smelting qualified molten steel into a cast strip having the thickness of 1.4-2.5mm by means of a pair of casting rolls which oppositely rotate, and controlling the casting temperature of the molten steel at 1580-1650°C; carrying out online hot rolling on the cast strip, wherein the cast strip is rolled into a hot rolled thin strip with the thickness of 0.7 to 2.0 mm by means of one-pass hot rolling, the hot rolling reduction is 10-70%, and the temperature of the cast strip entering into a hot rolling mill is greater than 900°C; and after rolling, cooling and reeling, the hot rolled strip steel being cooled to 400 to 500°C by aerosol to obtain a uniform acicular ferrite structure, and soon afterwards reeling into a roll. The yield strength of the low-cost weathering steel is above 345 MPa, and the elongation of the low-cost weathering steel is above 23%. The production control has the characteristics of short production process, low production cost and alloy cost, and excellent surface quality and shape of the hot-rolled strip steel.

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 38/16 - Alliages ferreux, p. ex. aciers alliés contenant du cuivre
• C22C 38/18 - Alliages ferreux, p. ex. aciers alliés contenant du chrome
• C22C 38/20 - Alliages ferreux, p. ex. aciers alliés contenant du chrome et du cuivre
• B21B 1/46 - 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 du métal immédiatement après la coulée continue
• 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

Abrégé

A rolling method for improving the surface quality of a double-roller continuous casting rolling strip. Two rolling mills (1, 2) are installed on a double-roller continuous casting production line, and the two rolling mills may be independently used or used at the same time; in case of independent use, when one of the rolling mills is used for rolling and a surface problem occurs, the other rolling mill may be used for replacing the rolling mill, and meanwhile, a roller of the fault rolling mill may be replaced on-line; and in case of use at the same time, the rolling strip of the double-roller continuous casting may be rolled to 0.4mm to the thinnest extent. The method solves the problems of frequent casting starts and stops.

Classes IPC  ?

• B21B 1/46 - 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 du métal immédiatement après la coulée continue
• 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

Abrégé

A method of manufacturing an easy-to-weld twin roll cast and hot-rolled steel strip, such as a Q345 steel strip, having a chemical composition by mass percentage of: C: ≤0.05%; Si: 0.15～0.3%; Mn: ≤0.7%; Nb: ≤0.04%; P: ≤0.03%; S: ≤0.003%; N: ≤0.005%, and the balance being Fe and inevitable impurities is disclosed. The method comprises twin roll casting the molten steel and forming a cast strip having a thickness of 1.4-2.5 mm, hot rolling the cast strip and forming a hot-rolled strip having a thickness of 0.7-1.9 mm by means of a one pass hot rolling step, cooling the hot rolled strip to 400-600°C at a cooling rate of 30-80°C/s, and coiling the cooled hot rolled strip.

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