公开(公告)号：EP3730642A1

公开(公告)日：2020-10-28

申请号：EP18891097.0

申请日：2018-11-30

申请人： POSCO

发明人： CHO, Jae-Young ,  YI, Il-Cheol ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/00 ,  C21D8/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16

摘要： A structural steel having excellent brittle crack propagation resistance, according to one aspect of the present invention, comprises, by wt%, 0.02-0.12% of C, 0.01-0.8 % of Si, 1.7-2.5% of Mn, 0.005-0.5% of Al, and the balance of Fe and inevitable impurities, wherein an outer surface part and an inner center part thereof are microstructurally distinguished in the thickness direction, and the surface part comprises tempered bainite as a base structure, comprises fresh martensite as a second structure and can comprise austenite as a residual structure.

公开(公告)号：EP3392364B1

公开(公告)日：2020-07-29

申请号：EP16875937.1

申请日：2016-11-22

申请人： POSCO

发明人： YI, Il-Cheol ,  KIM, Yong-Jin ,  KIM, Sung-Kyu ,  KANG, Sang-Deok ,  LEE, Un-Hae

IPC分类号： C22C38/38 ,  C22C38/02 ,  C22C38/32 ,  C22C38/26 ,  C21D8/02 ,  C21D6/00 ,  C21D9/46 ,  C21D1/18 ,  C22C38/28

公开(公告)号：EP3901306A2

公开(公告)日：2021-10-27

申请号：EP19898698.6

申请日：2019-12-13

申请人： POSCO

发明人： YI, Il-Cheol ,  CHO, Jae-Young ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/19 ,  C22C38/06 ,  C21D8/04 ,  C21D9/46 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C21D1/20 ,  C21D1/22 ,  B21B37/74 ,  B21B3/00

摘要： A structural steel having excellent brittle fracture resistance according to an aspect of the present invention comprises, by weight%, 0.02-0.12% of C, 0.01-0.8% of Si, 1.5-2.5% of Mn, 0.005-0.5% of Al, 0.02% or less of P, 0.01% or less of S, 0.0015-0.015% of N, and the remainder of Fe and unavoidable impurities, wherein an outer surface layer portion and an inner central portion are microstructurally divided along the thickness direction, the surface layer portion comprises tempered bainite as a matrix structure, the central portion comprises bainitic ferrite as a matrix structure, and the NDT temperature by the NRL drop-weight test may be -70°C or lower.

公开(公告)号：EP4438761A1

公开(公告)日：2024-10-02

申请号：EP22895942.5

申请日：2022-11-07

申请人： POSCO Co., Ltd

发明人： YI, Il-Cheol ,  KIM, Sung-Il

IPC分类号： C22C38/38 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/00 ,  C22C38/58 ,  C21D8/02 ,  B21C47/02

CPC分类号： B21C47/02 ,  C21D8/02 ,  C22C38/00 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/58

摘要： An embodiment of the present invention provides a hot-rolled steel sheet comprising, by wt%, 0.06-0.12% of C, 0.004-0.4% of Si, 0.8-2.0% of Mn, 0.01-0.05% of Al, 0.05-1.0% of Cr, 0.001-0.3% of Mo, 0.001-0.05% of P, 0.001-0.005% of S, 0.001-0.01% of N, 0.001-0.05% of Nb, 0.001-0.05% of Ti, 0.001-0.005% of B, and the remainder of Fe and other inevitable impurities, satisfying relational formula 1 below, and having a microstructure including, by area%, at least one from among 5-15% of austenite, 80% or more of auto-tempered martensite, and the remainder of bainite and ferrite. 10C+Si+2.5Mn/1.5Cr+2.0Mo−3.2Nb≤20

公开(公告)号：EP3733905A1

公开(公告)日：2020-11-04

申请号：EP18894284.1

申请日：2018-11-23

申请人： POSCO

发明人： YI, Il-Cheol ,  CHO, Jae-Young ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/38 ,  C22C38/58 ,  C22C38/00 ,  C21D8/00 ,  C21D8/02 ,  C21D9/46

摘要： A high-strength structural steel material having excellent fatigue crack propagation inhibitory characteristics according to an aspect of the present invention contains, by weight, 0.02-0.12% of C, 1.7-2.5% of Mn, 0.01-0.8% of Si, 0.005-0.5% of Al, and the balance Fe and unavoidable impurities, wherein a microstructure of the structural steel material is divided into a surface layer portion outside and a central portion inside along a thickness direction; the surface layer portion may comprise tempered bainite as a matrix structure, fresh martensite as a second structure, and austenite as a residual structure; and the central portion may comprise lath bainite.

公开(公告)号：EP3392362A1

公开(公告)日：2018-10-24

申请号：EP16876076.7

申请日：2016-12-16

申请人： POSCO

发明人： KIM, Yong-Jin ,  LEE, Soon-Gi ,  YI, Il-Cheol ,  KIM, Sung-Kyu ,  KANG, Sang-Deok ,  LEE, Un-Hae

IPC分类号： C22C38/04 ,  C21D8/02 ,  C21D6/00

CPC分类号： C21D9/46 ,  C21D6/00 ,  C21D6/005 ,  C21D8/02 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/001 ,  C21D2211/004 ,  C22C38/04

摘要： The present invention relates to a wear resistant steel material which can be suitably used for industrial machinery, structural materials, steel materials for slurry pipes, sour steel materials, mining, transportation and storage fields, etc. in the oil gas industry which require properties such as ductility and wear resistance. More particularly, the present invention relates to a wear resistant steel material excellent in toughness and internal quality, and a method for manufacturing the same.

公开(公告)号：EP3901305A2

公开(公告)日：2021-10-27

申请号：EP19898344.7

申请日：2019-12-06

申请人： POSCO

发明人： CHO, Jae-Young ,  YI, Il-Cheol ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/19 ,  C22C38/06 ,  B21B37/74 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/18 ,  C21D1/20 ,  C21D1/22

摘要： A high-strength structural steel having excellent cold bendability, according to one embodiment of the present invention, comprises, by wt%, 0.02-0.1% of C, 0.01-0.6% of Si, 1.7-2.5% of Mn, 0.005-0.5% of Al, 0.02% or less of P, 0.01% or less of S, 0.0015-0.015% of N, and the balance of Fe and other inevitable impurities, wherein an outer surface layer part and an inner central part thereof are microstructurally divided in a thickness direction, the surface layer part can comprise tempered austenite as a matrix structure, and the central part can comprise bainitic ferrite as a matrix structure.

公开(公告)号：EP3392364A1

公开(公告)日：2018-10-24

申请号：EP16875937.1

申请日：2016-11-22

申请人： POSCO

发明人： YI, Il-Cheol ,  KIM, Yong-Jin ,  KIM, Sung-Kyu ,  KANG, Sang-Deok ,  LEE, Un-Hae

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

摘要： The present invention relates to a high hardness abrasion resistant steel having excellent toughness and cutting crack resistance, and a method for manufacturing the same. A high hardness abrasion resistant steel according to one aspect of the present invention has a composition containing, by weight ratio, 2.1 to 4.0% of Mn, 0.15 to 0.2% of C, 0.02 to 0.5% of Si, 0.2 to 0.7% of Cr, the remainder being Fe and other unavoidable impurities, has a microstructure in which the prior austenite grain size is 25 µm or less and martensite is the main structure, and satisfies the condition where Ac3-Ac1 is 100°C or less.