公开(公告)号：US11542569B2

公开(公告)日：2023-01-03

申请号：US16473042

申请日：2017-12-21

Applicant: POSCO

Inventor： Hyung-Gu Kang ,  Sang Jin Lee ,  Jae-Hong Shim ,  Yong-Heon Lee ,  Jong-Jin Jeon

IPC: C21D9/46 ,  C22C38/58 ,  C22C38/44 ,  C22C38/42 ,  C22C38/02 ,  C22C38/00 ,  C21D9/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/18

Abstract: An austenitic stainless steel having excellent processability and surface characteristics and a method of manufacturing the austenitic stainless steel are disclosed. The austenitic stainless steel includes, by weight %, 0.005% to 0.15% of carbon (C), 0.1% to 1.0% of silicon (Si), 0.1% to 2.0% of manganese (Mn), 6.0% to 10.5% of nickel (Ni), 16% to 20% of chromium (Cr), 0.005% to 0.2% of nitrogen (N), the remainder iron (Fe) and other unavoidable impurities, wherein a degree of Ni surface negative segregation defined by the following Formula (1) is in a range of 0.6 to 0.9. (CNi-Min)/(CNi-Ave)  Formula (1), where CNi-Min is a minimum concentration of Ni on the surface of the austenitic stainless steel and CNi-Ave is an average concentration of Ni on the surface of the austenitic stainless steel.

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.