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Title:
STEEL SHEET AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2019/050010
Kind Code:
A1
Abstract:
The present invention stably produces a high-strength steel sheet which exhibits excellent toughness not only in the inner part of the steel sheet but also in the surface layer of the steel sheet. A steel sheet which has a component composition that contains, in mass%, from 0.080% to 0.200% (inclusive) of C, 0.40% or less of Si, from 0.50% to 5.00% (inclusive) of Mn, 0.015% or less of P, 0.0050% or less of S, 3.00% or less of Cr, 5.00% or less of Ni, 0.080% or less of Al, 0.0070% or less of N and 0.0030% or less of B, with the balance made up of Fe and unavoidable impurities. This steel sheet is configured such that: the carbon equivalent Ceq IIW is 0.57% or more; the bainite area fraction in the surface layer is 10% or more; and the yield strength is 620 MPa or more.

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Inventors:
KITSUYA SHIGEKI (JP)
ICHIMIYA KATSUYUKI (JP)
Application Number:
PCT/JP2018/033286
Publication Date:
March 14, 2019
Filing Date:
September 07, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/58
Domestic Patent References:
WO2015162939A12015-10-29
WO2017094593A12017-06-08
Foreign References:
JP2014177669A2014-09-25
JPS62174322A1987-07-31
JP2012062558A2012-03-29
JP2012062561A2012-03-29
JP2015190008A2015-11-02
Other References:
KOUZABUROU OOTANI: "Development of extremely thick (210 mm) 800N/mm2 grade steel plates for racks of jack-up rigs", NIPPON STEEL TECHNICAL REPORT, 1993, pages 10 - 16
See also references of EP 3680358A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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