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：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.