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.