Title:
HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/208763
Kind Code:
A1
Abstract:
Disclosed is a high-strength steel sheet comprising 0.15-0.35 mass% C, 0.5-3.0 mass% in total of Si and Al, 1.0-4.0 mass% Mn, 0.05 mass% or less of P, and 0.01 mass% or less of S, with the remainder comprising Fe and inevitable impurities, wherein: the steel structure comprises a ferrite fraction of 5% or less, a total fraction of tempered martensite and tempered bainite of 60% or greater, and a retained austenite amount of 10% or greater; the average size of MA is 1.0 µm or less; and the half width in Mn concentration distribution in a carbon concentrated region of an amount equivalent to said retained austenite amount is 0.3 mass% or greater.
Inventors:
MURAKAMI TOSHIO
OTANI SHIGEO
FUTAMURA YUICHI
KAKIUCHI ELIJAH
MURATA TADAO
OTANI SHIGEO
FUTAMURA YUICHI
KAKIUCHI ELIJAH
MURATA TADAO
Application Number:
PCT/JP2017/017753
Publication Date:
December 07, 2017
Filing Date:
May 10, 2017
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/58
Foreign References:
| JP2015193897A | 2015-11-05 | |||
| JP2015224359A | 2015-12-14 | |||
| JP2013227654A | 2013-11-07 | |||
| JP2012017500A | 2012-01-26 | |||
| JP2016098427A | 2016-05-30 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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