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Title:
HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2014/061270
Kind Code:
A1
Abstract:
Provided are: a high-strength cold-rolled steel sheet having excellent ductility, stretch-flangeability and bendability; and a method for manufacturing the high-strength cold-rolled steel sheet. A high-strength cold-rolled steel sheet having the following chemical composition, in mass%: 0.12 to 0.22% of C; 0.8 to 1.8% of Si; 1.8 to 2.8% of Mn; 0.020% or less of P; 0.0040% or less of S; 0.005 to 0.08% of Al; 0.008% or less of N; 0.001 to 0.040% of Ti; 0.0001 to 0.0020% of B; and 0.0001 to 0.0020% of Ca; with the remainder made up by Fe and unavoidable impurities. The high-strength cold-rolled steel sheet has such a structure that the total area ratio of a ferrite phase and a bainite phase is 50 to 70%, the average crystal particle diameter of the ferrite phase and the bainite phase is 1 to 3 μm, the area ratio of a tempered martensite phase is 25 to 45%, the average crystal particle diameter of the tempered martensite phase is 1 to 3 μm, and the area ratio of a retained austenite phase is 2 to 10%.

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Inventors:
KAWABE HIDETAKA (JP)
YOKOTA TAKESHI (JP)
SUGIHARA REIKO (JP)
ITOH DAIGO (JP)
TAHARA KAZUNORI (JP)
Application Number:
PCT/JP2013/006139
Publication Date:
April 24, 2014
Filing Date:
October 16, 2013
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C22C38/14; C21D9/46
Foreign References:
JP2012122093A2012-06-28
JP2006104532A2006-04-20
JP2001207235A2001-07-31
JP2010196115A2010-09-09
JP2009203548A2009-09-10
JP2004308002A2004-11-04
JP2005179703A2005-07-07
JP2006283130A2006-10-19
JP2004359974A2004-12-24
Other References:
See also references of EP 2910662A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
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