公开(公告)号：EP4455326A1

公开(公告)日：2024-10-30

申请号：EP22911854.2

申请日：2022-12-20

申请人： POSCO Co., Ltd

发明人： LEE, Soon-Gi ,  CHOI, Jong-Kyo ,  KANG, Sang-Deok

IPC分类号： C22C30/00 ,  C22C22/00 ,  C21D8/02 ,  C21D9/46

摘要： According to one aspect of the present invention, an austenitic high-manganese steel having excellent ultra-low temperature toughness in a weld heat-affected zone, and a manufacturing method therefor can be provided.

公开(公告)号：EP3835448A1

公开(公告)日：2021-06-16

申请号：EP19847417.3

申请日：2019-08-02

申请人： POSCO

发明人： SO, Tae-Il ,  KIM, Dae-Woo ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/12 ,  C22C38/08 ,  C22C38/16 ,  C22C38/14 ,  C22C38/00 ,  C21D8/02 ,  C21D9/50

摘要： 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.

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：EP3561120A1

公开(公告)日：2019-10-30

申请号：EP17882436.3

申请日：2017-12-21

申请人： POSCO

发明人： KIM, Yong-Jin ,  OH, Hong-Yeol ,  LEE, Hong-Ju ,  KANG, Sang-Deok ,  PARK, Yoen-Jung ,  JUNG, Young-Deok

IPC分类号： C22C38/38 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02

摘要： Provided according to one preferred aspect of the present invention are austenite steel material having superb abrasion resistance and toughness, and a method for producing the austenite steel material. The austenite steel material having superb abrasion resistance and toughness according to one preferred aspect of the present invention 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.

公开(公告)号：EP4450663A1

公开(公告)日：2024-10-23

申请号：EP22907691.4

申请日：2022-11-01

申请人： POSCO Co., Ltd

发明人： SO, Tae-Il ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/02 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/00 ,  C22C38/44 ,  C22C38/46 ,  C22C38/42 ,  C22C38/50

摘要： The present invention relates to steel suitable for a pressure vessel that can be used as petrochemical manufacturing equipment, a storage tank, and the like, and, more specifically, to steel having excellent hydrogen-induced cracking (HIC) resistance and low-temperature impact toughness and a method for manufacturing same.

公开(公告)号：EP4056725A1

公开(公告)日：2022-09-14

申请号：EP20884059.5

申请日：2020-10-26

申请人： POSCO

发明人： SO, Tae-Il ,  KANG, Sang-Deok

IPC分类号： C22C38/58 ,  C22C38/44 ,  C22C38/42 ,  C21D8/02 ,  C21D1/63

摘要： Provided are high strength steel having excellent low-temperature impact toughness, and a method for manufacturing same. The high strength strength steel having excellent low-temperature impact toughness of the present invention comprises, in percentage by weight, 0.04-0.12% of carbon(C); 0.1-0.5% of silicon(Si); 1.2-2.5% of manganese(Mn); 0.01% or less of phosphorus (P); 0.01% or less of sulfur(S); 0.01-0.08% of Aliminum(Al); 0.01-0.08% of niobium(Nb); 0.01-0.5% of chromium(Cr); 0.4-1.0% of nickle(Ni); 0.5% or less of copper(Cu); 0.01-0.5% of molybdenum(Mo); 0.05% or less of vanadium(V); 0.005-0.02% of titanium(Ti); 0.001-0.0025% of boron(B); 0.002-0.01% of nitrogen(N); the balance being Fe and inevitable impurities, wherein the high strength steel has a Ceq value less than 0.55 represented by Relational expression 1 below, has an internal microstructure consisting of 80% or more of banitic ferrite and balance granular bainite in an area fraction at a point of 1/4t of the thickness thereof, and has an aspect ratio of a prior austenite grain boundary of 3.0 or greater and a thickness of 60 mm or greater and 100 mm or less.

公开(公告)号：EP3872215A1

公开(公告)日：2021-09-01

申请号：EP19876536.4

申请日：2019-10-25

申请人： POSCO

发明人： LEE, Un-Hae ,  KIM, Bo-Sung ,  KANG, Sang-Deok ,  SEOK, Jeong-Hun ,  KIM, Woo-Chul ,  KIM, Yong-Jin

IPC分类号： C22C38/38 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/16 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02 ,  C21D6/00

摘要： A high manganese austenitic steel having high yield strength according to one aspect of the present invention, comprises: by wt%, 0.2% to 0.5% of C, 20% to 28% of Mn, 0.05% to 0.5% of Si, 0.03% or less of P, 0.005% or less of S, 0.005% to 0.05% of Al, and the remainder being Fe and other unavoidable impurities; and 95 area% or more of austenite as a microstructure, wherein the grain boundary fraction in crystal grains of the microstructure may be 7 area% or more.

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：EP3730644A1

公开(公告)日：2020-10-28

申请号：EP18891918.7

申请日：2018-12-21

申请人： POSCO

发明人： CHAE, Jae-Yong ,  KANG, Sang-Deok

IPC分类号： C22C38/04 ,  C22C38/14 ,  C22C38/06 ,  C22C38/00 ,  C22C38/12 ,  C22C38/18 ,  C22C38/16 ,  C21D8/02

摘要： The present invention relates to structural steel used as a material of storage tanks, pressure vessels, building structures, ship structures, etc. and, more particularly, to steel with excellent toughness of a welding heat affected zone and a manufacturing method thereof.