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：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：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：US20200299816A1

公开(公告)日：2020-09-24

申请号：US16765615

申请日：2018-08-10

Applicant: POSCO

Inventor： Ji Soo Kim ,  Hak Kim ,  Ja Yong Choi ,  Young-Jong Seo

IPC: C22C38/42 ,  C22C38/44 ,  C22C38/54 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C21D8/02

Abstract: Disclosed is a non-magnetic austenitic stainless steel with excellent corrosion resistance which is applicable to an environment requiring corrosion resistance along with excellent non-magnetic properties, and manufacturing method thereof. The non-magnetic austenitic stainless steel with excellent corrosion resistance according to an embodiment of the present disclosure includes, in percent (%) by weight of the entire composition, C: 0.05% or less, Si: 1.0% or less, Mn: 0.5 to 2.0%, Cr: 16 to 24%, Ni: 10 to 16%, N: 0.2% or less, the remainder of iron (Fe) and other inevitable impurities, and satisfies a following equation (1). Ni≥−2.7−5.8*C−1.77*Si−0.066*Mn+0.893*Cr+1.05*Mo−0.88*Cu−13.8*N  (1)

公开(公告)号：US20240401174A1

公开(公告)日：2024-12-05

申请号：US18696200

申请日：2022-10-19

Applicant: POSCO CO., LTD

Inventor： Kyunghun Kim ,  Munsoo Lee ,  Hak Kim ,  Jieon Park

IPC: C22C38/34 ,  C21D8/12 ,  C22C38/00 ,  C22C38/04 ,  C22C38/22 ,  C22C38/28

Abstract: Disclosed herein are ferritic stainless steel and a manufacturing method wherein the ferritic stainless steel has magnetic properties improved by controlling alloy components and a manufacturing process in order to increase responsiveness to an externally applied magnetic field. The ferritic stainless steel having improved magnetic properties according to an embodiment of the present invention may comprise, by % by weight, C: 0% (exclusive) to 0.02% (inclusive), N: 0% (exclusive) to 0.02% (inclusive), Si: 0.5% to 2.0% (both inclusive), Mn: 0.1% to 0.3% (both inclusive), Cr: 16.0% to 20.1% (both inclusive), Mo: 1.0% (exclusive) to 2.0% (inclusive), Ti: 0.1% to 0.4% (both inclusive), and the balance of iron (Fe) and inevitable impurities.

公开(公告)号：US20220018006A1

公开(公告)日：2022-01-20

申请号：US17293274

申请日：2019-10-31

Applicant: POSCO

Inventor： Kyung-Hun Kim ,  Hak Kim ,  Man Jin Ha ,  Ji Soo Kim ,  Jong Jin Jeon

IPC: C22C38/58 ,  C22C38/02 ,  C22C38/44 ,  C22C38/00 ,  C21D9/46 ,  C21D8/02

Abstract: Disclosed are austenitic stainless steel that can exhibit high strength while having non-magnetic properties, and a manufacturing method thereof.
The high strength non-magnetic austenitic stainless steel according to an embodiment of present disclosure includes, in percent (%) by weight of the entire composition, C: 0.02 to 0.12%, Si: 1.2% or less, Mn: 0.5 to 2.0%, Cr: 17.0 to 22.0%, Ni: 11.0 to 15.0%, Mo: 3.0% or less, N: 0.25% or less, the remainder of iron (Fe) and other inevitable impurities, satisfies C+N: 0.25% or more, and satisfies following Formulas (1) and (2). [{Cr+Mo+1.5*Si+18}/{Ni+30*(C+N)+0.5*Mn+36}+0.262]*161−161−log(cooling rate)

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：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.

公开(公告)号：US20220267875A1

公开(公告)日：2022-08-25

申请号：US17622474

申请日：2020-06-10

Applicant: POSCO

Inventor： Seok Weon Song ,  Hak Kim ,  Ji Soo Kim

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

Abstract: Provided is an austenitic stainless steel having improved strength. This austenitic stainless steel includes, in percent (%) by weight, 0.06 to 0.15% of carbon (C), 0.3% or less (excluding 0) of nitrogen (N), more than 1.0% and equal to or less than 2.0% of silicon (Si), 5.0 to 7.0% of manganese (Mn), 15.0 to 16.0% of chromium (Cr), 0.3% or less (excluding 0) of nickel (Ni), 2.5% or less (excluding 0) of copper (Cu), and the remainder of iron (Fe) and inevitable impurities, and satisfies Expressions (1), (2), and (3) below: 15≤0.2Mn+337C+1.2Cu−1.7Cr+3.3Ni+78N−3.5Si+3.0≤30   Expression (1): 2.3≤[Cr+1.5Si]/[Ni+0.31Mn+22C+1Cu+14.2N]≤3.0   Expression (2): 1.0≤((Cr+1.5Si+18)/(Ni+0.52Cu+30(C+N)+0.5Mn+36)+0.262)*161−161≤7.0   Expression (3): wherein C, N, Si, Mn, Cr, Ni, and Cu refer to contents of the elements, respectively.

公开(公告)号：US20220010392A1

公开(公告)日：2022-01-13

申请号：US17293360

申请日：2019-10-31

Applicant: POSCO

Inventor： Kyung-Hun Kim ,  Ji Eon Park ,  Hak Kim ,  Hyung-Gu Kang ,  Ji Soo Kim

IPC: C21D8/02 ,  C22C38/58 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/42 ,  C22C38/44

Abstract: A non-magnetic austenitic stainless steel includes, in percent (%) by weight of the entire composition, C: 0.01 to 0.05%, Si: 1.5% or less, Mn: 0.5 to 3.5%, Cr: 17.0 to 22.0%, Ni: 9.0 to 14.0%, Mo: 1.0% or less, Cu: 0.2 to 2.5%, N: 0.05 to 0.25%, the remainder of iron (Fe) and other inevitable impurities, and satisfies following Formulas (1) and (2). (1) 0≤3*(Cr+Mo)+5*Si−65*(C+N)−2*(Ni+Mn)−27≤5 and (2) 660−500*(C+N)−10*Cr−30*(Ni+Si+Mo+Cu)≤0.