Invention Grant
- Patent Title: Hot-rolled steel sheet
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Application No.: US15551171Application Date: 2016-02-22
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Publication No.: US10913988B2Publication Date: 2021-02-09
- Inventor: Hiroshi Shuto , Natsuko Sugiura , Mitsuru Yoshida , Tatsuo Yokoi , Masayuki Wakita
- Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: WOPCT/JP2015/054876 20150220
- International Application: PCT/JP2016/055071 WO 20160222
- International Announcement: WO2016/133222 WO 20160825
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C22C38/00 ; C22C38/14 ; C22C38/28 ; C22C38/26 ; C22C38/12 ; C21D6/00 ; C21D8/02 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/20 ; C22C38/22 ; C22C38/24 ; C22C38/32 ; C22C38/48 ; C22C38/50

Abstract:
A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which include, by area ratio, ferrite and bainite in a range of 80% to 98% in total, and martensite in a range of 2% to 10%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary, and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 10% to 60%.
Public/Granted literature
- US20180044749A1 HOT-ROLLED STEEL SHEET Public/Granted day:2018-02-15
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