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Title:
HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2020/184154
Kind Code:
A1
Abstract:
To provide a high-strength steel sheet which has excellent ductility, stretch-flange formability, bendability, and LME resistance, from which a component can be manufactured with high dimensional precision, and which has a tensile strength of 980 MPa or greater. The present invention provides a high-strength steel sheet having a component composition containing C, Si, Mn, P, S, Al, N, Mo, Cr, Ca, and Sb, [%Si], [%Mn], [%P], [%Mo], and [%Cr] satisfying a predetermined relationship, and the remainder comprising Fe and unavoidable impurities, the high-strength steel sheet having a steel structure having ferrite, a hard phase, and residual austenite, the carbon concentration in the residual austenite being 0.55% to 1.10%, the quantity of diffusible hydrogen in the steel sheet being 0.80 mass ppm or less, the thickness of surface layer softening being 5 µm to 150 µm, and the frequency of corresponding grain boundaries in a surface layer of the steel sheet after a high-temperature tensile test being 0.45 or less, and the high-strength steel sheet having a tensile strength of 980 MPa or greater.

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Inventors:
MINAMI HIDEKAZU (JP)
TANAKA YUJI (JP)
YOKOTA TAKESHI (JP)
Application Number:
PCT/JP2020/007200
Publication Date:
September 17, 2020
Filing Date:
February 21, 2020
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/60; C22C18/00; C22C18/04
Domestic Patent References:
WO2018124157A12018-07-05
WO2016171237A12016-10-27
WO2013047760A12013-04-04
WO2016171237A12016-10-27
Foreign References:
JP2011225976A2011-11-10
KR20100096840A2010-09-02
JP2007302918A2007-11-22
Other References:
See also references of EP 3940094A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
Download PDF:
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