发明授权
- 专利标题: Hot-stamped steel, cold-rolled steel sheet and method for producing hot-stamped steel
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申请号: US14781110申请日: 2014-03-27
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公开(公告)号: US10544475B2公开(公告)日: 2020-01-28
- 发明人: Yoshihiro Suwa , Toshiki Nonaka , Koichi Sato , Manabu Naruse , Yasunori Iwasa , Yoshifumi Kobayashi
- 申请人: NIPPON STEEL CORPORATION
- 申请人地址: JP Tokyo
- 专利权人: NIPPON STEEL CORPORATION
- 当前专利权人: NIPPON STEEL CORPORATION
- 当前专利权人地址: JP Tokyo
- 代理机构: Birch, Stewart, Kolasch & Birch, LLP
- 优先权: JP2013-076835 20130402
- 国际申请: PCT/JP2014/058950 WO 20140327
- 国际公布: WO2014/162984 WO 20141009
- 主分类号: C22C38/04
- IPC分类号: C22C38/04 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/08 ; C22C38/12 ; C22C38/14 ; C22C38/16 ; C22C38/18 ; C23C2/06 ; C22C38/06 ; C23C2/28 ; C25D7/06 ; C22C38/22 ; C22C38/28 ; C22C38/32 ; C21D6/00 ; C23C2/12
摘要:
A hot-stamped steel according to the present invention has a predetermined chemical composition, satisfies (5×[Si]+[Mn])/[C]>10 when [C] is the amount of C by mass %, [Si] is the amount of Si by mass %, and [Mn] is the amount of Mn by mass %, includes 40% to 95% ferrite and 5% to 60% martensite in area fraction, and optionally further includes 10% or less pearlite in area fraction, 5% or less retained austenite in volume fraction, and less than 40% bainite in area fraction. The total of the area fraction of ferrite and the area fraction of martensite is 60% or more, the hardness of martensite measured with a nanoindenter satisfies H2/H1
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