HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING SAME

Title:

HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING SAME

Document Type and Number:

WIPO Patent Application WO/2016/139876

Kind Code:

A1

Abstract:

Provided is a high-strength steel sheet having: an element composition that includes, in mass%, C: 0.09-0.17% of C, Si: 0.6-1.7% of Si, 3.5% or less of Mn, 0.03% or less of P, 0.005% or less of S, 0.08% or less of Al, 0.006% or less of N, 0.05% or less of Ti, and 0.0002-0.0030% of B, the balance being Fe and unavoidable impurities; and a steel sheet structure that includes, in area percentage, less than 20% (including 0%) of a ferrite phase, 75% or more (including 100%) of a tempered martensite phase, 10% or less (including 0%) of a non-tempered martensite phase, and less than 5% (including 0%) of a residual austenite phase, the Vickers hardness of the tempered martensite phase being 280-340, and the tensile strength of the sheet being 950-1,120 MPa.

Inventors:

KOHSAKA NORIAKI (JP)
FUNAKAWA YOSHIMASA (JP)
SAKURAI MICHITAKA (JP)
SUZUKI YOSHIKAZU (JP)

Application Number:

PCT/JP2016/000156

Publication Date:

September 09, 2016

Filing Date:

January 14, 2016

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

C22C38/00; C21D9/46; C22C38/14; C22C38/60; C23C2/06; C23C2/28; C23C2/40; C22C18/00

Foreign References:

JP2014029021A	2014-02-13
JP2014196557A	2014-10-16
JP2006183140A	2006-07-13
JP2009209450A	2009-09-17
JP2013227657A	2013-11-07
JP2008038247A	2008-02-21
JP2013032581A	2013-02-14
JP2011225915A	2011-11-10

Other References: