Invention Grant
- Patent Title: Hot stamped article, method of producing hot stamped article, energy absorbing member, and method of producing energy absorbing member
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Application No.: US14112584Application Date: 2012-05-11
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Publication No.: US10023925B2Publication Date: 2018-07-17
- Inventor: Kaoru Kawasaki
- Applicant: Kaoru Kawasaki
- 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: JP2011-108397 20110513; JP2011-108564 20110513; JP2011-198160 20110912; JP2011-198261 20110912
- International Application: PCT/JP2012/062209 WO 20120511
- International Announcement: WO2012/157581 WO 20121122
- Main IPC: C21D1/18
- IPC: C21D1/18 ; C21D6/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C21D7/13 ; C21D9/00 ; C21D9/46 ; C21D1/673 ; C22C38/00 ; C22C38/20 ; C22C38/22 ; C22C38/24 ; C22C38/26 ; C22C38/28 ; C22C38/32 ; B21B27/06 ; B21B37/74 ; B21J1/06 ; B21D22/02

Abstract:
A hot stamped article has a component composition containing, in terms of % by mass, 0.002% to 0.1% of C, 0.01% to 0.5% of Si, 0.5% to 2.5% of Mn+Cr, 0.1% or less of P, 0.01% or less of S, 0.05% or less of t-Al, 0.005% or less of N, and 0.0005% to 0.004% of B which is optionally contained in a case where the Mn+Cr is 1.0% or more, the remainder being Fe and unavoidable impurities. The hot stamped article has a microstructure composed of, in terms of an area ratio, 0% or more and less than 90% of martensite, 10% to 100% of bainite, and less than 0.5% of unavoidable inclusion structures, or a microstructure composed of, in terms of an area ratio, 99.5% to 100% of bainitic ferrite, and less than 0.5% of unavoidable inclusion structures.
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