公开(公告)号：US20220403491A1

公开(公告)日：2022-12-22

申请号：US17772324

申请日：2020-07-08

Applicant: POSCO

Inventor： Seokweon Song ,  Hak Kim ,  Mi-nam Park

IPC: C22C38/58 ,  C22C38/02 ,  C22C38/42 ,  C21D8/02 ,  C21D9/46

Abstract: Disclosed is an austenitic stainless steel having an increased yield ratio. The disclosed austenitic stainless steel is characterized by comprising, in percent by weight (wt %), 0.1% or less (exclusive of 0) of C, 0.2% or less (exclusive of 0) of N, 1.5 to 2.5% of Si, 6.0 to 10.0% of Mn, 15.0 to 17.0% of Cr, 0.3% or less (exclusive of 0) of Ni, 2.0 to 3.0% of Cu, and the remainder of Fe and other inevitable impurities, and satisfying Expressions (1) and (2) below. 3.2≤5.53+1.4Ni−0.16Cr+17.1(C+N)+0.722Mn+1.4Cu−5.59Si≤7  Expression (1): 551-462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)≤110  Expression (2): wherein C, N, Si, Mn, Cr, Ni, and Cu indicate the content (wt %) of respective elements.

公开(公告)号：US12173392B2

公开(公告)日：2024-12-24

申请号：US17772324

申请日：2020-07-08

Applicant: POSCO

Inventor： Seokweon Song ,  Hak Kim ,  Mi-nam Park

IPC: C22C38/58 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/42

Abstract: Disclosed is an austenitic stainless steel having an increased yield ratio. The disclosed austenitic stainless steel is characterized by comprising, in percent by weight (wt %), 0.1% or less (exclusive of 0) of C, 0.2% or less (exclusive of 0) of N, 1.5 to 2.5% of Si, 6.0 to 10.0% of Mn, 15.0 to 17.0% of Cr, 0.3% or less (exclusive of 0) of Ni, 2.0 to 3.0% of Cu, and the remainder of Fe and other inevitable impurities, and satisfying Expressions (1) and (2) below. 3.2≤5.53+1.4Ni−0.16Cr+17.1(C+N)+0.722Mn+1.4Cu−5.59Si≤7  Expression (1): 551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)≤110  Expression (2): wherein C, N, Si, Mn, Cr, Ni, and Cu indicate the content (wt %) of respective elements.

公开(公告)号：US20250051894A1

公开(公告)日：2025-02-13

申请号：US18716667

申请日：2022-10-25

Applicant: POSCO CO., LTD

Inventor： Seokweon Song ,  Minam Park

IPC: C22C38/58 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42

Abstract: The present disclosure relates to an austenitic stainless steel and a manufacturing method therefor, and specifically, to an austenitic stainless steel and a manufacturing method therefor, wherein the austenitic stainless steel can secure both excellent strength and ductility even after undergoing low-temperature annealing and have excellent competitiveness and corrosion resistance.

公开(公告)号：US20230175108A1

公开(公告)日：2023-06-08

申请号：US17924230

申请日：2021-06-22

Applicant: POSCO

Inventor： Seokweon Song ,  Jong-su Paek ,  Hak Kim

IPC: C22C38/58 ,  C22C38/48 ,  C22C38/42 ,  C22C38/02 ,  C22C38/00 ,  C21D6/00 ,  C21D9/46 ,  C21D8/02

CPC classification number: C22C38/58 ,  C22C38/48 ,  C22C38/42 ,  C22C38/02 ,  C22C38/001 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263

Abstract: Disclosed is a high-strength austenitic stainless steel and a method for producing same, wherein the austenitic stainless steel has high productivity due to excellent hot workability thereof and a superior cost reduction effect due to a large decrease in content of nickel (Ni) which is a high-priced element, and has a yield strength of 450 MPa or more and an elongation of 45% or more after cold rolling and annealing and an ultra-high strength of 1800 MPa or more even after skin pass rolling, and a method for producing same.

公开(公告)号：US20230142021A1

公开(公告)日：2023-05-11

申请号：US17918014

申请日：2021-02-02

Applicant: POSCO

Inventor： Seokweon Song ,  Jong-su Paek

IPC: C22C38/58 ,  C21D8/02 ,  C22C38/02 ,  C22C38/42 ,  C22C38/00

CPC classification number: C22C38/58 ,  C21D8/0236 ,  C22C38/02 ,  C22C38/42 ,  C21D8/0205 ,  C21D8/0226 ,  C22C38/001 ,  C21D2211/001

Abstract: Disclosed are a low-cost austenitic stainless steel having high strength and high formability and a method for manufacturing same. The low-cost austenitic stainless steel having high strength and high formability according to an embodiment includes, greater than 0% and at most 0.08% of C, 0.2 to 0.25% of N, 0.8 to 1.5% of Si, 8.0 to 9.5% of Mn, 15.0 to 16.5% of Cr, greater than 0% and at most 1.0% of Ni, 0.8 to 1.8% of Cu, and the remainder of Fe and other unavoidable impurities and satisfies Expressions (1) to (4) below.


Ni+0.47Mn+15N≥7.5  (1)



23(C+N)+1.3 Si+0.24(Cr+Ni+Cu)+0.1Mn≥12  (2)



551−462(C+N)−9.2Si−8.1Mn−13.7Cr−29(Ni+Cu)≤70  (3)



11≤1+45C−5Si+0.09Mn+2.2Ni−0.28Cr−0.67Cu+88.6N≤17  (4)

Here, C, N, Si, Mn, Cr, Ni, and Cu represent contents (wt %) of the elements, respectively.