公开(公告)号：EP4212644A1

公开(公告)日：2023-07-19

申请号：EP21864773.3

申请日：2021-09-07

申请人： POSCO Co., Ltd

发明人： KIM, Sung-Kyu ,  CHO, Kyoung-Rae ,  SEO, Chang-Hyo ,  PARK, Ki-Hyun ,  HAN, Sang-Ho

IPC分类号： C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C21D8/02

摘要： The present invention provides a high-strength steel sheet and a method for manufacturing same, wherein the high-strength steel sheet is a material suitable for automobile structural members and has excellent moldability, such as hole expandability, through the improvement of ductility, while having a low yield ratio and high strength.

公开(公告)号：EP4411013A1

公开(公告)日：2024-08-07

申请号：EP22873172.5

申请日：2022-09-21

申请人： POSCO Co., Ltd

发明人： CHO, Kyoung-Rae ,  KIM, Sung-Kyu ,  PARK, Jun-Ho ,  HAN, Sang-Ho ,  KIM, Jeong-Hun

IPC分类号： C22C38/38 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/00 ,  C21D8/02 ,  B21C47/02 ,  C21D9/46

CPC分类号： B21C47/02 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

摘要： The present invention relates to steel suitable as a material for automobiles and, particularly, to a high-strength and thick steel sheet having excellent hole expandability and ductility, and a manufacturing method therefor.

公开(公告)号：EP4455346A1

公开(公告)日：2024-10-30

申请号：EP22911820.3

申请日：2022-12-19

申请人： POSCO Co., Ltd

发明人： KIM, Sung-Kyu ,  HAN, Tae-Kyo ,  PARK, Jun-Ho ,  CHO, Kyoung-Rae ,  HAN, Sang-Ho

IPC分类号： C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C21D8/02 ,  C21D1/667

摘要： The present invention relates to a steel sheet for use in automobiles, etc., and to a steel sheet that has high strength and high formability and is superb in terms of spot weldability, and a manufacturing method therefor.

公开(公告)号：EP4421204A1

公开(公告)日：2024-08-28

申请号：EP22883985.8

申请日：2022-10-18

申请人： POSCO Co., Ltd

发明人： KIM, Sung-Kyu ,  CHO, Kyoung-Rae ,  PARK, Jun-Ho ,  HWANG, Hyun-Gyu ,  HAN, Sang-Ho

IPC分类号： C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C21D8/02 ,  C21D9/46 ,  B21C47/02

CPC分类号： B21C47/02 ,  C21D8/02 ,  C21D9/46 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38

摘要： The present invention relates to a steel sheet used in automobiles, etc., and to a steel sheet that has high strength and high formability and is eco-friendly manufactured, and a manufacturing method therefor.

公开(公告)号：EP4375391A1

公开(公告)日：2024-05-29

申请号：EP22846060.6

申请日：2022-06-22

申请人： POSCO Co., Ltd

发明人： CHO, Kyoung-Rae ,  KIM, Sung-Kyu ,  PARK, Jun-Ho ,  HAN, Sang-Ho

IPC分类号： C22C38/38 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/00 ,  C21D8/02 ,  B21C47/02

CPC分类号： B21C47/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38

摘要： The present invention relates to steel suitable as a material for automobiles and, specifically, to a high-strength steel sheet having excellent hole expandability and ductility, and a manufacturing method therefor. The high-strength steel sheet of the present invention has a microstructure comprising a hard phase and a soft phase, wherein a martensite phase, which is the hard phase, is evenly distributed in a recrystallized ferrite matrix through optimized cold-rolling and annealing processes, and a nonequilibrium ferrite phase is introduced at the interface between the hard phase and the soft phase so as to increase the crack resistance during processing.

公开(公告)号：EP4261318A1

公开(公告)日：2023-10-18

申请号：EP21906901.0

申请日：2021-11-22

申请人： POSCO Co., Ltd

发明人： CHO, Kyoung-Rae ,  PARK, Hee-Su ,  HWANG, Hyun-Gyu ,  KIM, Sung-Kyu ,  SEO, Chang-Hyo

IPC分类号： C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C21D9/46 ,  C21D8/02

摘要： The present invention relates to steel suitable for automotive materials and, more specifically, to a high-strength steel sheet having excellent bendability and formability, and a method for manufacturing same.