HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

Title:

HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2013/111556

Kind Code:

A1

Abstract:

The present invention addresses the problem of providing: a high-strength hot-rolled steel sheet which has excellent strength and excellent processability (in particular, bending processability) at the same time; and a method for producing the high-strength hot-rolled steel sheet. In order to solve the above-mentioned problem, the present invention is characterized by: having a specific composition; having an area ratio of a ferrite phase of 95% or more; having an average crystal grain diameter of the ferrite phase of 8 μm or less; having a structure wherein the average particle diameter of carbides within the crystal grains of the ferrite phase is less than 10 nm; and having a tensile strength of 980 MPa or more.

Inventors:

KOSAKA NORIAKI (JP)
FUNAKAWA YOSHIMASA (JP)
SHIGEMI MASATO (JP)
OOKUBO HIDEKAZU (JP)
KANEMURA TOKUNORI (JP)

Application Number:

PCT/JP2013/000257

Publication Date:

August 01, 2013

Filing Date:

January 21, 2013

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; B21B3/00; C21D9/46; C22C38/14; C22C38/60; C23C2/02; C23C2/06; C23C2/28

Foreign References:

JP2011225980A	2011-11-10
JP2010275594A	2010-12-09
JP2009052139A	2009-03-12
JP2006161112A	2006-06-22
JP2004143518A	2004-05-20
JP2008285741A	2008-11-27
JP2005002406A	2005-01-06
JPH0257634A	1990-02-27
JP2007262429A	2007-10-11
JP2008189978A	2008-08-21

Other References: