Invention Grant
- Patent Title: Austenitic stainless steel having excellent processability and surface characteristics, and manufacturing method therefor
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Application No.: US16473042Application Date: 2017-12-21
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Publication No.: US11542569B2Publication Date: 2023-01-03
- Inventor: Hyung-Gu Kang , Sang Jin Lee , Jae-Hong Shim , Yong-Heon Lee , Jong-Jin Jeon
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Morgan, Lewis & Bockius LLP
- Priority: KR10-2016-0178365 20161223,KR10-2017-0176063 20171220
- International Application: PCT/KR2017/015227 WO 20171221
- International Announcement: WO2018/117683 WO 20180628
- Main IPC: C21D9/46
- 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.
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