发明申请
- 专利标题: HOT-ROLLED STEEL SHEET
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申请号: US15324241申请日: 2015-07-13
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公开(公告)号: US20170197235A1公开(公告)日: 2017-07-13
- 发明人: Hiroshi SHUTO , Tatsuo YOKOI , Daisuke MAEDA , Eisaku SAKURADA , Takeshi TOYODA
- 申请人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 申请人地址: JP Tokyo
- 专利权人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人: NIPPON STEEL & SUMITOMO METAL CORPORATION
- 当前专利权人地址: JP Tokyo
- 优先权: JP2014-144502 20140714
- 国际申请: PCT/JP2015/070078 WO 20150713
- 主分类号: B21B1/22
- IPC分类号: B21B1/22 ; C23C2/28 ; C23C2/40 ; C22C38/16 ; C22C38/14 ; B32B15/18 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C21D9/46 ; C21D8/02 ; C23C2/06 ; C22C38/12
摘要:
A hot-rolled steel sheet according to the present invention has a chemical composition comprising, in mass %, C: 0.03 to 0.2%, Mn: 0.1 to 3.0%, P: 0.10% or less, S: 0.03% or less, Al+Si: 0.2 to 3.0%, N: more than 0% and equal to or less than 0.01%, O: more than 0% and equal to or less than 0.01%, and the balance: iron and impurities. A microstructure of the hot-rolled steel sheet contains bainite as the main constituent, and contains hard phases constituted by martensite and/or austenite in an amount of, in area fraction, equal to or more than 3% and less than 20% where 60% or more of the hard phase present in a sheet-thickness central portion have an aspect ratio of 3 or more, the hard phases present in the sheet-thickness central portion have a length in a rolling direction of less than 20 μm, and the sum of X-ray random intensity ratios of orientation and orientation as viewed from the rolling direction is 3.5 or more, and an X-ray random intensity ratio of orientation as viewed from the rolling direction is 1.0 or less.
公开/授权文献
- US10226800B2 Hot-rolled steel sheet 公开/授权日:2019-03-12
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