COLD ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR

Title:

COLD ROLLED STEEL SHEET AND PRODUCTION METHOD THEREFOR

Document Type and Number:

WIPO Patent Application WO/2012/133563

Kind Code:

A1

Abstract:

This cold rolled steel sheet contains, in percent by mass, 0.02%-0.4% C, 0.001%-2.5% Si, 0.001%-4.0% Mn, and 0.001%-2.0% Al, and has a total Si and Al content of 1.0%-4.5% by mass. The average pole density for a group of {100}<011>-{223}<110> orientations is 1.0-6.5 and the pole density for the {332}<113> crystal orientation is 1.0-5.0. The microstructure, by area ratio, contains 5%-80% ferrite, 5%-80% bainite, and 2%-30% residual austenite. The microstructure is limited to no more than 20% martensite, no more than 10% pearlite, and no more than 60% tempered martensite.

Inventors:

NOZAKI TAKAYUKI (JP)
TAKAHASHI MANABU (JP)
FUJITA NOBUHIRO (JP)
YOSHIDA HIROSHI (JP)
WATANABE SHINICHIRO (JP)
YAMAMOTO TAKESHI (JP)

Application Number:

PCT/JP2012/058199

Publication Date:

October 04, 2012

Filing Date:

March 28, 2012

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Assignee:

NIPPON STEEL CORP (JP)
NOZAKI TAKAYUKI (JP)
TAKAHASHI MANABU (JP)
FUJITA NOBUHIRO (JP)
YOSHIDA HIROSHI (JP)
WATANABE SHINICHIRO (JP)
YAMAMOTO TAKESHI (JP)

International Classes:

C22C38/06; C21D8/02; C21D9/46; C22C38/58

Foreign References:

JP2003113440A	2003-04-18
JP2004250744A	2004-09-09
JP2009114523A	2009-05-28
JPS61217529A	1986-09-27
JPH0559429A	1993-03-09

Other References: