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.