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Title:
HIGH-STRENGTH COLD-ROLLED STEEL SHEET HAVING SMALL VARIATIONS IN STRENGTH AND DUCTILITY, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/089095
Kind Code:
A1
Abstract:
A high-strength cold-rolled steel sheet which: has a component composition comprising, in mass%, 0.05 to 0.30% of C, 3.0% or less (excluding 0%) of Si, 0.1 to 5.0% of Mn, 0.1% or less (excluding 0%) of P, 0.02% or less (excluding 0%) of S, 0.01 to 1.0% of Al, 0.01% or less (excluding 0%) of N and a remainder made up by iron and unavoidable impurities; contains a ferrite at an area ratio of 20 to 50% as a soft first phase, with the remainder being a hard second phase; and has a tissue comprising tempered martensite and/or tempered bainite and is controlled in such a manner that cementite particles having proper sizes are present in grains of the ferrite at a proper number density.

Inventors:
MASUDA TOMOKAZU (JP)
HATA HIDEO (JP)
KAJIHARA KATSURA (JP)
MURAKAMI TOSHIO (JP)
MIURA MASAAKI (JP)
IKEDA MUNEAKI (JP)
Application Number:
PCT/JP2012/082058
Publication Date:
June 20, 2013
Filing Date:
December 11, 2012
Export Citation:
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Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; B21B3/00; C21D9/46; C22C38/06; C22C38/58
Domestic Patent References:
WO2009125874A12009-10-15
WO2009066734A12009-05-28
Foreign References:
JP2007302918A2007-11-22
JP2011080106A2011-04-21
JP2007138262A2007-06-07
JP2003277832A2003-10-02
JP2000212684A2000-08-02
Other References:
WILLIAM C. LESLIE: "The Physical Metallurgy of Steels", 1985, MARUZEN CO., LTD., pages: 273
See also references of EP 2792760A4
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
Download PDF:
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Claims:



 
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