HOT-DIP ZINC-COATED STEEL SHEET OR ALLOYED HOT-DIP ZINC-COATED STEEL SHEET HAVING SUPERIOR STRENGTH-BENDABILITY BALANCE WITH TENSILE STRENGTH OF 1180 MPa OR MORE

Title:

HOT-DIP ZINC-COATED STEEL SHEET OR ALLOYED HOT-DIP ZINC-COATED STEEL SHEET HAVING SUPERIOR STRENGTH-BENDABILITY BALANCE WITH TENSILE STRENGTH OF 1180 MPa OR MORE

Document Type and Number:

WIPO Patent Application WO/2014/181728

Kind Code:

A1

Abstract:

This hot-dip zinc-coated steel sheet has a region that satisfies a predetermined chemical composition and contains at least 0.2% by mass of Zn in a solid solution, the region being present 5 μm or more in the depth direction of the matrix from the boundary between the coated layer and the steel plate, the Vickers hardness of a steel plate surface layer portion at 15 μm or more in the depth direction of the matrix from the boundary between the coated layer and the steel plate being 80% or less of that of the matrix center portion, and the structure excluding the martensite and bainite of the steel plate being 5% or less in terms of the area ratio.

Inventors:

SHIBATA KOSUKE
MURAKAMI TOSHIO
KAJIHARA KATSURA
IKEDA MUNEAKI
NAKAYA MICHIHARU

Application Number:

PCT/JP2014/061850

Publication Date:

November 13, 2014

Filing Date:

April 28, 2014

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)

International Classes:

C22C38/00; C21D9/46; C22C38/04; C22C38/58; C23C2/06; C23C2/28; C23C2/40

Foreign References:

JP2011246746A	2011-12-08
JP2011214101A	2011-10-27
JP2011157583A	2011-08-18
JP2008024972A	2008-02-07
JPH06306533A	1994-11-01
JP2012012703A	2012-01-19

Other References: