Invention Grant
- Patent Title: Ti-containing ferritic stainless steel sheet for exhaust pipe flange member, production method, and flange member
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Application No.: US16098150Application Date: 2017-02-07
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Publication No.: US10995888B2Publication Date: 2021-05-04
- Inventor: Seiji Mitsunaga , Nobuhisa Ebihama , Yasuhiro Ehara , Kazunari Imakawa
- 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
- Agency: Clark & Brody LP
- Priority: JPJP2016-098323 20160516
- International Application: PCT/JP2017/004349 WO 20170207
- International Announcement: WO2017/199482 WO 20171123
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/02 ; F16L23/032 ; C21D6/00 ; C21D8/00 ; C21D9/46 ; C22C38/00 ; C22C38/04 ; C22C38/06 ; C22C38/22 ; C22C38/28 ; C22C38/32 ; F01N13/16 ; F01N13/18

Abstract:
A Ti-containing ferritic stainless steel sheet for an exhaust pipe flange member has a composition containing, in mass percentage, from 0.003 to 0.030% of C, 2.0% or less of S i, 2.0% or less of Mn, 0.050% or less of P, 0.040% or less of S, from 10.0 to 19.0% of Cr, 0.030% or less of N, from 0.07 to 0.50% of Ti, from 0.010 to 0.20% of Al, from 0 to 1.50% of Mo, and from 0 to 0.0030% of B, with the balance Fe and unavoidable impurities, has a K value of 150 or more, has a sheet surface hardness of 170 HV or less, and has a sheet thickness of from 5.0 to 11.0 mm. The K value equals −0.07×Cr−6790×Free(C+N)−1.44×d+267, wherein Free(C+N) corresponds to the solid-dissolved (C+N) concentration (% by mass), and d represents an average crystal grain diameter (μm).
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