- Patent Title: Stainless steel sheet and method of manufacturing the same, separator for solid polymer fuel cell, solid polymer fuel cell, and solid polymer fuel cell battery
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Application No.: US16648624Application Date: 2017-09-19
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Publication No.: US11326224B2Publication Date: 2022-05-10
- Inventor: Hideya Kaminaka , Yoshitaka Nishiyama , Koichi Nose , Jun Maki , Junko Imamura , Kohei Maejima , Yuya Takashima
- Applicant: NIPPON STEEL STAINLESS STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL STAINLESS STEEL CORPORATION
- Current Assignee: NIPPON STEEL STAINLESS STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- International Application: PCT/JP2017/033625 WO 20170919
- International Announcement: WO2019/058409 WO 20190328
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C21D8/02 ; C22C38/00 ; C22C38/18 ; C23G1/08 ; H01M8/021 ; H01M8/1018

Abstract:
Provided are a stainless steel sheet with good corrosion resistance, low contact resistance and good press workability without the use of expensive materials such as gold or rare metals, and a method of manufacture the same. A method of manufacturing a stainless steel sheet includes: preparing a slab having a chemical composition including, in mass %: 20 to 26% Cr, up to 0.1% N, up to 2.0% Si, etc. (step S1); performing hot rolling and cold rolling on the slab to produce a rolled steel sheet with a thickness of 50 to 200 μm (step S2); an annealing step in which the rolled steel sheet is annealed and cooled in a gas atmosphere containing nitrogen (step S3); and pickling the rolled steel sheet after the annealing step with a solution containing a non-oxidizing acid (step S4). The stainless steel sheet has an N content of 0.6 to 2.0% by mass.
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