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Title:
MARTENSITIC STAINLESS STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2018/074271
Kind Code:
A1
Abstract:
A martensitic stainless steel sheet which has a component composition containing, in mass%, 0.035-0.090% of C, 0.01-1.0% of Si, 0.01-0.90% of Mn, 0.050% or less of P, 0.050% or less of S, 10.0-14.0% of Cr, 0.01-0.40% of Ni, 0.001-0.50% of Al, 0.05-0.50% of V and 0.050-0.20% of N, with the contents of C and N satisfying relational expressions (C% + N%) ≥ 0.10% and N% ≥ C%, and with the balance being made up of Fe and unavoidable impurities. This martensitic stainless steel sheet is configured such that: the number of precipitates having a length of 200 nm or more is 25 or less per 100 μm2 in the surface layer part of the steel sheet; the tensile strength thereof is 1,300 MPa or more; the proof stress thereof is 1,100 MPa or more; and the elongation thereof is 8.0% or more.

Inventors:
NAKAMURA Tetsuyuki (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 〒1000011, JP)
ISHIKAWA Shin (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 〒1000011, JP)
SUGIHARA Reiko (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chom, Chiyoda-ku Tokyo 11, 〒1000011, JP)
Application Number:
JP2017/036512
Publication Date:
April 26, 2018
Filing Date:
October 06, 2017
Export Citation:
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Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60; C21C7/00
Domestic Patent References:
WO2015107608A12015-07-23
WO2016170761A12016-10-27
Foreign References:
JP2016065301A2016-04-28
JP2009280912A2009-12-03
JP2006169582A2006-06-29
JP2002038243A2002-02-06
JP2005054272A2005-03-03
JP2002097554A2002-04-02
JPH0356621A1991-03-12
JPH08319519A1996-12-03
JP2001140041A2001-05-22
JP2006097050A2006-04-13
JPH07316740A1995-12-05
Attorney, Agent or Firm:
SUGIMURA Kenji (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigasek, Chiyoda-ku Tokyo 13, 〒1000013, JP)
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