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Title:
STEEL SHEET FOR HOT STAMPING, METHOD FOR PRODUCING SAME, AND HOT-STAMPED STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2013/133270
Kind Code:
A1
Abstract:
This hot-stamped steel material comprises a chemical composition including, in mass%, 0.18-0.26% of C, more than 0.02% to 0.05% or less of Si, 1.0-1.5% of Mn, 0.03% or less of P, 0.02% or less of S, 0.001-0.5% of Al, 0.1% or less of N, 0.001-0.02% of O, 0-2.0% of Cr, 0-1.0% of Mo, 0-0.5% of V, 0-0.5% of W, 0-5.0% of Ni, 0-0.01% of B, 0-0.5% of Ti, 0-0.5% of Nb, 0-1.0% of Cu, and Fe and impurities as the remainder, and is characterized in that: the concentration of Mn-containing inclusions is 0.010 mass% or more to less than 0.25 mass%; and the percentage, by number, of Mn oxides in said inclusions with a maximum length of 1.0-4.0 µm is 10.0% or more. This hot-stamped steel material ensures excellent resistance to hydrogen embrittlement even in cases where the steel material after having been hot-stamped is subjected to processing in which stress remains, such as perforation, and the steel material can also be worked easily.

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Inventors:
TANAHASHI HIROYUKI (JP)
TOMOKIYO TOSHIMASA (JP)
Application Number:
PCT/JP2013/055992
Publication Date:
September 12, 2013
Filing Date:
March 05, 2013
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/06; C22C38/54; C23C2/06; C23C2/12; C23C2/28; C23C2/40; C22C18/04; C22C21/02
Domestic Patent References:
WO2008066194A12008-06-05
Foreign References:
JP2000017371A2000-01-18
JP2003166035A2003-06-13
JP2002080933A2002-03-22
JP2011184758A2011-09-22
JP2008144239A2008-06-26
JP2006009116A2006-01-12
JP2010174291A2010-08-12
JP2006029977A2006-02-02
Other References:
See also references of EP 2824207A4
Attorney, Agent or Firm:
EINSEL Felix-Reinhard et al. (JP)
アインゼル Felix-Reinhardt (JP)
Download PDF:
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Claims:



 
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