公开(公告)号：US20230407443A1

公开(公告)日：2023-12-21

申请号：US18037473

申请日：2021-10-29

Applicant: POSCO Co., Ltd

Inventor： Kyung-hun Kim ,  Hak Kim ,  Manjin Ha ,  Jisoo Kim

IPC: C22C38/44 ,  C22C38/42 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/50 ,  C22C38/54 ,  C21D8/02 ,  C21D9/46

CPC classification number: C22C38/44 ,  C22C38/42 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/002 ,  C22C38/06 ,  C22C38/50 ,  C22C38/54 ,  C21D8/0226 ,  C21D8/0273 ,  C21D9/46 ,  C21D2211/001

Abstract: Disclosed is a high-strength austenitic stainless steel having excellent hot workability. The high-strength austenitic stainless steel having excellent hot workability according to the present disclosure includes, in percent by weight (wt %), 0.01 to 0.035% of C, 0.5% or less of Si, 0.5 to 1.5% of Mn, 17 to 22% of Cr, 6 to 11% of Ni, 1% or less of Mo, 1% or less of Cu, 0.1 to 0.22% of N, and the balance of Fe and inevitable impurities, wherein a value of Formula (1) below 1.9 or more, or a precipitation temperature of chromium nitride satisfies a value represented by Formula (2) below or less.


3×(Cr+Mo)+5×Si−2×Ni−Mn−70×(C+N)−27  (1)



1180+36×C+12×Mo+17×Cu+411×N−35×Mn  (2)

公开(公告)号：US20230151470A1

公开(公告)日：2023-05-18

申请号：US17624969

申请日：2020-12-30

Applicant: POSCO

Inventor： Kyunghun Kim ,  Hak Kim ,  Jisoo Kim ,  Jongjin Jeon

IPC: C22C38/58 ,  C22C38/44 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42

CPC classification number: C22C38/58 ,  C22C38/44 ,  C22C38/001 ,  C22C38/02 ,  C22C38/42

Abstract: Provided is a non-magnetic austenitic stainless steel. According to an embodiment of the disclosed non-magnetic austenitic stainless steel, the non-magnetic austenitic stainless steel includes, in percent by weight (wt %), 0.01 to 0.1% of carbon (C), 1.5% or less (excluding 0) of silicon (Si), 0.5 to 3.5% of manganese (Mn), 16 to 22% of chromium (Cr), 7 to 15% of nickel (Ni), 3% or less of molybdenum (Mo), 0.01 to 0.3% of nitrogen (N), and the remainder of iron (Fe) and inevitable impurities, wherein a value of Expression (1) below is a negative value: (1) 3*(Cr+Mo)+5*Si−65*(C+N)−2*(Ni+Mn)−28, wherein in Expression (1), Cr, Mo, Si, C, N, Ni, and Mn denote contents (wt %) of the alloy elements, respectively.