HIGH STRENGTH STEEL PLATE EXCELLENT IN FORMABILITY AND METHOD FOR PRODUCTION THEREOF

Title:

HIGH STRENGTH STEEL PLATE EXCELLENT IN FORMABILITY AND METHOD FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2004/113580

Kind Code:

A1

Abstract:

A high strength steel plate excellent in formability which has a chemical composition in mass %: C: 0.03 to 0.20 %, Si: 0.005 to 0.3 %, Mn: 1.0 to 3.1 %, P: 0.001 to 0.06 %, S: 0.001 to 0.01 %, N: 0.0005 to 0.01 %, Al: 0.2 to 1.2 %, Mo ≤ 0.5 %, and the balance: Fe and inevitable impurities, with the proviso that the values of mass % for Si and Al satisfy the following formula (1): (0.0012×[objective value of TS]-0.29-[Si])/2.45 < Al < 1.5-3×[Si] ····(1) wherein [objective value of TS] represents a design strength value for the steel plate in an Mpa unit, and has a metal structure containing ferrite and martensite. The above high strength steel plate is also excellent in formability and the capability of being chemically treated and that of being hot-dip zinc plated.

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Inventors:

NONAKA TOSHIKI (JP)
TANIGUCHI HIROKAZU (JP)
MIZUTANI MASAAKI (JP)
FUJITA NOBUHIRO (JP)

Application Number:

PCT/JP2003/008006

Publication Date:

December 29, 2004

Filing Date:

June 24, 2003

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
NONAKA TOSHIKI (JP)
TANIGUCHI HIROKAZU (JP)
MIZUTANI MASAAKI (JP)
FUJITA NOBUHIRO (JP)

International Classes:

C21D8/04; C21D9/48; C21D9/46; C22C38/00; C22C38/12; C22C38/14; (IPC1-7): C22C38/00; C21D9/46

Foreign References:

JP2003193192A	2003-07-09
JP2003239090A	2003-08-27
JP2000345288A	2000-12-12
JP2001234281A	2001-08-28

Other References: