公开(公告)号：EP1838477A4

公开(公告)日：2009-02-25

申请号：EP05821838

申请日：2005-12-26

申请人： POSCO CO LTD

发明人： LEE DAE-SUNG ,  MOON HEE-KYUNG ,  KIM YOON-HA

IPC分类号： B22D11/16

CPC分类号： B22D11/185

摘要： The present invention provides a robust control method for maintaining a melt level at a constant value in a mold in a twin roll strip casting process. In the twin roll strip casting process, whether using a stopper system (3), which is provided in a tundish (2) to supply melt into the mold, or using a camera system, which measures the melt level in the mold, the robust control method of the present invention controls the melt level both using an advanced controller, which controls, at an initial stage of the casting process or when a disturbance arises, the target value of the melt level such that the target level corresponds to the performance characteristics of the melt level control system, and using a feedback controller, which maintains the melt level at a constant value under normal casting conditions.

公开(公告)号：EP1937861A1

公开(公告)日：2008-07-02

申请号：EP06798530.9

申请日：2006-08-23

申请人： Posco Co., Ltd.

发明人： KIM, Sung-Kyu ,  CHIN, Kwang-Geun ,  KIM, Seong-Ju

IPC分类号： C22C38/04

CPC分类号： C22C38/42 ,  C21D6/005 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/04 ,  C21D8/0405 ,  C21D2211/001 ,  C22C38/06 ,  C22C38/58

摘要： A hot rolled steel sheet used for a bumper reinforcing material or for an impact absorption material in a door of automobiles, and a method for manufacturing the same are disclosed. The steel sheet comprises, by weight%, C: 0.2% ~ 1%, Mn: 8 ~ 15%, S: 0.05% or less, P: 0.03% or less, and the balance of Fe and other unavoidable impurities. A product of tensile strength and total elongation (TS x ToLEl) of the steel sheet is 24,000 MPa% or more. The method provides a high strength hot rolled steel sheet, which has a high strength-elongation balance value, ensuring excellent workability.

公开(公告)号：EP1831419A1

公开(公告)日：2007-09-12

申请号：EP05817831.0

申请日：2005-10-31

申请人： Posco Co., Ltd.

发明人： KIM, Sang-Heon c/o POSCO ,  CHO, Noi-Ha c/o POSCO ,  JIN, Yeong-Sool c/o POSCO

IPC分类号： C23C2/00

CPC分类号： C23C2/26 ,  C23C2/003 ,  C23C2/06 ,  C23C2/16 ,  C23C2/40 ,  Y10T428/12757 ,  Y10T428/12972

摘要： Disclosed herein are a spangle-free, hot-dip galvanized steel sheet, and a method and device for manufacturing the same. The hot-dip galvanized steel sheet is characterized in that a solidified zinc crystal of hot-dip galvanized layer has an average crystalline texture particle diameter of 10 to 88, and there is no solidification traces of dendrites upon observing under a microscope at a magnification of 100X. The hot-dip galvanized steel sheet comprises dipping a steel sheet in a bath of a zinc-coating solution containing 0.13 to 0.3% by weight of aluminum; air-wiping the steel sheet to remove an excess of the coating solution; spraying water or an aqueous solution on the air-wiped steel sheet, using a steel sheet temperature in the range of a hot-dip galvanization temperature to 419°C as a spray initiation temperature and using a steel sheet temperature in the range of 417°C to 415°C as a spray completion temperature; passing sprayed liquid droplets of water or aqueous solution through a mesh-like high- voltage charged electrode which is electrically charged with a high voltage of -1 to -50 kV; and allowing the electrode-passed liquid droplets to be bound to the surface of the steel sheet and thereby being served as solidification nuclei of molten zinc. The hot-dip galvanized steel sheet of the present invention exhibits superior corrosion resistance, blackening resistance, oil stain resistance, surface friction coefficient and surface appearance, and can be used for a variety of materials such as inner and outer plates of car body, household electric appliances and construction materials and steel sheet for painting.

公开(公告)号：EP1805339A1

公开(公告)日：2007-07-11

申请号：EP05856408.9

申请日：2005-09-30

申请人： Posco Co., Ltd.

发明人： CHOI, Shi-Hoon, c/o POSCO ,  KIM, Chin-Chul, c/o POSCO ,  CHIN, Kwang-Geun, c/o POSCO

IPC分类号： C22C38/00

CPC分类号： C21D9/46 ,  C21D6/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/001 ,  C22C38/04 ,  C22C38/14

摘要： A high-strength isotropic cold-rolled steel sheet having excellent shape-fixability, and a method for manufacturing the same are disclosed. The steel sheet is made using a low-carbon steel comprising a little amounts of Ti to have an r of 1.3 or less, r approaching 1, and a low in-plane anisotropy index (Dr) of 0.15 or less, ensuring excellent shape-fixability so as to be suitable for automotive outer panels which are essentially subjected to deformation in a stretching mode.

公开(公告)号：EP1346084A1

公开(公告)日：2003-09-24

申请号：EP01272364.9

申请日：2001-12-10

申请人： Posco Co., Ltd.

发明人： KIM, Myung-Su,Pohang Iron & Steel Co., Ltd.

IPC分类号： C25D3/00

CPC分类号： C25D3/565 ,  Y10S428/935 ,  Y10T428/12799 ,  Y10T428/1284

摘要： A Zn-Co-W alloy electropated_steel sheet with excellent corrosion resistance and weldability, and an electrolyte for manufacturing the same are provided.Accordingly, the present invention relates to a Zn-Co-W alloy electroplated steel sheet, wherein a plating layer consisting of Co: 0.1-3.0W%, and zinc: balance, is formed on the steel sheet and all tungsten plating is carried out with metallic tungsten; an electrolyte for manufacturing a Zn-Co-W alloy electroplated steel sheet,comprising zinc chloride:60-200g/l, cobalt chloride: 0.1-6.0g/l, tungsten:0.1-4.0g/l, citric acid: 0.5-10.0g/l, polyethylene glycol: 0.1-2.0 m/l and electric conductive aid: 30-400 g/l, wherein almost all ions of the tungsten form a complex compound with citric acid, thereby preventing formation of sludge; and a Zn-Co-W alloy electroplated steel sheet,on which a plating layer is formed by electroplating the steel in the electrolyte.

公开(公告)号：EP4455363A1

公开(公告)日：2024-10-30

申请号：EP22911905.2

申请日：2022-12-21

申请人： POSCO Co., Ltd

发明人： KIM, Jungwoo ,  HA, Bongwoo ,  LEE, Donggyu ,  NO, Taeyoung

IPC分类号： C23C22/08 ,  C23C22/20

摘要： An insulation coating composition for an electrical steel sheet according to an exemplary embodiment of the present disclosure contains, with respect to 100 parts by weight of a solid content, 30 to 60 parts by weight of an organic/inorganic composite in which inorganic nanoparticles are substituted in a resin, 15 to 45 parts by weight of a metal phosphate, 10 to 40 parts by weight of kaolin, 1 to 10 parts by weight of an inorganic dispersant, and 0.1 to 5 parts by weight of a carbon structure.

公开(公告)号：EP4455341A1

公开(公告)日：2024-10-30

申请号：EP22911824.5

申请日：2022-12-19

申请人： POSCO Co., Ltd

发明人： LEE, Hunju ,  SHIN, Su-Yong ,  KIM, Yunsu

IPC分类号： C22C38/34 ,  C22C38/00 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C21D8/12 ,  C21D9/46 ,  H01F1/147

摘要： A non-oriented electrical steel sheet includes by wt%, Si: 3.0 to 4.0%, Al: 0.1 to 1.5%, Mn: 0.1 to 0.5%, Cr: 2 to 20% of Mn content, a sum of Sn and Sb: 0.006 to 0.1%, C: 0.0010 to 0.0050%, and 0.0003 to 0.0050% of at least one of N, S, Ti, Nb, and V, and balance being Fe and unavoidable impurities, in which an area fraction of a grain having a grain diameter which is 10% or less of a thickness of the steel sheet is 0.5% or more, a number fraction of the grain is 20% or more, and an average grain diameter from a central layer to a surface layer in a thickness direction of the steel sheet satisfies a relationship of D(surface)/D(center) ≥ 0.6.

公开(公告)号：EP4455340A1

公开(公告)日：2024-10-30

申请号：EP22911827.8

申请日：2022-12-19

申请人： POSCO Co., Ltd

发明人： JO, Minho ,  HONG, Young-Kwang

IPC分类号： C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  C22C38/12 ,  C22C38/00 ,  C21D8/02 ,  C23C2/06

摘要： A cold-rolled steel sheet having improved strength and elongation, according to one embodiment of the present invention, comprises, in weight%: 0.04-0.08% of C; 0.05% or less (excluding 0%) of Si; 0.1-0.6% of Mn; 0.02-0.06% of Al; 0.015% or less (excluding 0%) of P; 0.015% or less (excluding 0%) of S; 0.006% or less (excluding 0%) of N; 0.02-0.04% of Nb; and the remainder of Fe and other inevitable impurities, wherein the cold-rolled steel sheet has a component reinforcement index defined by expression 1 of 470 or less, a crystal grain aspect ratio defined by expression 2 of 2.15 or less, and a composite reinforcement index defined by expression 3 of 500 to 600.

公开(公告)号：EP4455335A1

公开(公告)日：2024-10-30

申请号：EP22911927.6

申请日：2022-12-21

申请人： POSCO Co., Ltd

发明人： KWON, Soobin ,  KIM, Yunsu

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D8/12 ,  H01F1/147

摘要： A non-oriented electrical steel sheet according to one embodiment of the present invention comprises a steel sheet base material and an insulation film positioned on the steel sheet base material, satisfies the following formula 2 before stress relief annealing, and satisfies the following formula 3 after stress relief annealing, the steel sheet base material comprising, by wt%, 2.0-6.5% of Si, 0.1-1.3% of Al, 0.3-2.0% of Mn, 0.03% or less of Sn (excluding 0%), 0.02% or less of Sb (excluding 0%) and the balance of Fe and other inevitable impurities and satisfying the following formula 1. 0.030 ≥ Sn + Sb ≥ 0.005 0.1 ≥ Mn film / Mn50 10 ≥ Mn film / Mn50 ≥ 1 (In formula 1 to formula 3, [Sn] and [Sb] represent the amounts of Sn and Sb, respectively, [Mn film] represents the average amount (wt%) of Mn in the insulation film, and [Mn50] represents the amount (wt%) of Mn at a depth of 50 µm from the interface between the steel sheet base material and the insulation film toward the inside of the steel sheet base material.)

公开(公告)号：EP4455332A1

公开(公告)日：2024-10-30

申请号：EP22911901.1

申请日：2022-12-20

申请人： POSCO Co., Ltd

发明人： HONG, Jaewan ,  JOO, Hyung Don ,  PARK, Junesoo

IPC分类号： C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/14 ,  C22C38/00 ,  C22C38/34 ,  C22C38/12 ,  C21D8/12 ,  H01F1/147

摘要： A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by wt%, 1.4-3.0 % of Si; 0.001-1.5 % of Mn; and 0.001-0.2 % of Al, with the remainder of Fe and inevitable impurities, wherein a thickness deviation in the direction perpendicular to a rolling direction is 1.5 µm or less per 5 mm length, and a thickness derivation in the rolling direction is 10 µm or less per 1000 m length.