Invention Grant
- Patent Title: Ferrite-based stainless steel plate, steel pipe, and production method therefor
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Application No.: US17130634Application Date: 2020-12-22
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Publication No.: US11427881B2Publication Date: 2022-08-30
- Inventor: Junichi Hamada , Kou Nishimura , Jun Araki , Nozomu Fukuda , Toshio Tanoue
- Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
- Current Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2014-222202 20141031,JP2014-236113 20141121
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C22C38/60 ; C22C38/28 ; C21D6/00 ; C21D8/02 ; C22C38/02 ; C22C38/04 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50 ; C22C38/54 ; C22C38/00

Abstract:
A ferritic stainless steel sheet and a steel pipe as a material suitable for a heat-resistant component that is required to have especially excellent formability are provided. The ferritic stainless steel sheet contains 10 to 20 mass % of Cr and a predetermined amount of C, Si, Mn, P, S, Al and one or both of Ti and Nb, a {111}-orientation intensity being 5 or more and {411}-orientation intensity being less than 3 at a portion in the vicinity of a sheet-thickness central portion of the ferritic stainless steel sheet. Further, with similar composition and by setting {111} -orientation intensity at 4.0 or more and {311} -orientation intensity at less than 3.0, a relationship rm≥−1.0t+3.0 (t(mm): sheet thickness, rm: average r-value) is satisfied, thereby providing a ferritic stainless steel sheet and a steel pipe with excellent formability.
Public/Granted literature
- US20210108283A1 FERRITE-BASED STAINLESS STEEL PLATE, STEEL PIPE, AND PRODUCTION METHOD THEREFOR Public/Granted day:2021-04-15
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