Invention Grant
- Patent Title: Hot stamped steel and method for producing hot stamped steel
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Application No.: US14371512Application Date: 2013-01-11
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Publication No.: US09945013B2Publication Date: 2018-04-17
- Inventor: Toshiki Nonaka , Satoshi Kato , Kaoru Kawasaki , Toshimasa Tomokiyo
- 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: JP2012-004550 20120113
- International Application: PCT/JP2013/050385 WO 20130111
- International Announcement: WO2013/105633 WO 20130718
- Main IPC: B32B15/00
- IPC: B32B15/00 ; C22C38/06 ; C23C2/06 ; C23C2/12 ; C23C2/28 ; C21D9/46 ; C21D8/02 ; C23C2/02 ; C23C2/26 ; C23C2/40 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/12 ; C22C38/14 ; C22C38/18 ; B32B15/01 ; C22C38/08 ; C22C38/16 ; C22C38/22 ; C22C38/28 ; C22C38/32 ; C22C38/38 ; C21D1/673 ; C25D5/36

Abstract:
A hot stamped steel according to the present invention satisfies an expression of (5×[Si]+[Mn])/[C]>11 when [C] represents an amount of C by mass %, [Si] represents an amount of Si by mass %, and [Mn] represents an amount of Mn by mass %, a metallographic structure after hot stamping includes 40% to 90% of a ferrite and 10% to 60% of a martensite in an area fraction, a total of an area fraction of the ferrite and an area fraction of the martensite is 60% or more, a hardness of the martensite measured with a nanoindenter satisfies an H2/H1
Public/Granted literature
- US20150010775A1 HOT STAMPED STEEL AND METHOD FOR PRODUCING HOT STAMPED STEEL Public/Granted day:2015-01-08
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