Invention Grant
- Patent Title: Hot-rolled steel sheet and method for manufacturing same
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Application No.: US16624771Application Date: 2018-07-06
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Publication No.: US11313009B2Publication Date: 2022-04-26
- Inventor: Mitsuru Yoshida , Nobusato Kojima , Yuuki Kanzawa , Kohhei Kamiya
- Applicant: NIPPON STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIPPON STEEL CORPORATION
- Current Assignee: NIPPON STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JPJP2017-133889 20170707
- International Application: PCT/JP2018/025687 WO 20180706
- International Announcement: WO2019/009410 WO 20190110
- Main IPC: B22D11/00
- IPC: B22D11/00 ; C21D9/46 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/06 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50 ; C22C38/54 ; C22C38/58

Abstract:
A hot-rolled steel sheet according to an aspect of the present invention has a predetermined chemical composition, in which, in a location at a depth of ¼ of a sheet thickness from a surface, an area ratio of ferrite is 10% to 55%, a total area ratio of bainite and martensite is 45% to 90%, a total area ratio of the ferrite, the bainite, and the martensite is 90% or more, an average crystal grain size is 12.0 μm or less, in a texture measured in a sheet thickness central portion, a maximum pole density of orientation groups of {100} , {211} , {311} , {110} , and {332} is 8.0 or less, a total of pole densities of {211} and {332} is 10.0 or less, and a tensile strength is 950 MPa or more.
Public/Granted literature
- US20210140005A1 HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME Public/Granted day:2021-05-13
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