Invention Application
- Patent Title: FERRITIC STAINLESS STEEL SHEET COVER MEMBER AND PRODUCTION METHOD FOR FERRITIC STAINLESS STEEL SHEET
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Application No.: US15562768Application Date: 2016-03-16
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Publication No.: US20180078981A1Publication Date: 2018-03-22
- Inventor: Takafumi KAWAGOE , Junichi KATSUKI
- Applicant: Nisshin Steel Co., Ltd.
- Applicant Address: JP Tokyo
- Assignee: Nisshin Steel Co., Ltd.
- Current Assignee: Nisshin Steel Co., Ltd.
- Current Assignee Address: JP Tokyo
- Priority: JP2015-076634 20150403
- International Application: PCT/JP2016/058375 WO 20160316
- Main IPC: B21B1/22
- IPC: B21B1/22 ; B21B3/02 ; C21D9/46 ; C22C38/00 ; C22C38/04 ; C22C38/06 ; C22C38/12 ; C22C38/16 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; C22C38/34 ; C22C38/40

Abstract:
In a ferritic stainless steel sheet, the arithmetic average roughness Ra is 0.2 μm or more and 1.2 μm or less. In addition, the dull pattern transfer rate on the steel sheet surface is 15% or more and 70% or less. Furthermore, micropits with a depth of 0.5 μm or more and an open area of 10 μm2 or more which are formed on the steel sheet surface have an existing density of 10.0 or less per 0.01 mm2 and an open area ratio of 1.0% or less. In addition, a film formed on the steel sheet surface is constituted from an oxide containing SiO2 as a main constituent, which oxide contains at least Si, N, Al, Mn, Cr, Fe, Nb, Ti and O as film-forming elements other than C, wherein the Si content is 10 at % or more, and the N content is 10 at % or less.
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