Title:
AUSTENITIC STAINLESS STEEL MATERIAL, METHOD FOR PRODUCING SAME, AND PLATE SPRING
Document Type and Number:
WIPO Patent Application WO/2021/230244
Kind Code:
A1
Abstract:
An austenitic stainless steel material according to the present invention contains a prescribed amount of a prescribed element and has: a composition represented by formula (1) below, in which the value of Md30 is between -40 and 0; a metallic structure including 25-35 vol% of a processing-induced martensite phase; a tensile strength (TS) of 1,450 MPa or greater; and a breaking elongation (EL) of 12.0% or greater, wherein TS×EL is 24,000 or greater, and the stress relaxation rate represented by formula (2) below is 1.20% or less. (1): Md30 = 551 - 462 (C + N) - 9.2 Si - 8.1 Mn - 29 (Ni + Cu) - 13.7 Cr - 18.5 Mo (in this formula, element symbols denote the content (mass%) of each element); (2): the stress relaxation rate = (σ1 - σ2)/σ1 (in this formula, σ1 is the stress at less than 0.2% yield strength, and σ2 is the stress after the stress of σ1 is applied for 200 seconds)
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Inventors:
HIRAKAWA NAOKI (JP)
TANAKA MASAYA (JP)
ISHIMARU EIICHIRO (JP)
TANAKA MASAYA (JP)
ISHIMARU EIICHIRO (JP)
Application Number:
PCT/JP2021/017915
Publication Date:
November 18, 2021
Filing Date:
May 11, 2021
Export Citation:
Assignee:
NIPPON STEEL STAINLESS STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/58; C22C38/60
Domestic Patent References:
| WO2019240127A1 | 2019-12-19 | |||
| WO2013146876A1 | 2013-10-03 |
Foreign References:
| JP2009221553A | 2009-10-01 | |||
| JP2020041204A | 2020-03-19 | |||
| JP2018003099A | 2018-01-11 | |||
| JP2015086405A | 2015-05-07 | |||
| JPH1068050A | 1998-03-10 |
Attorney, Agent or Firm:
AXIS PATENT INTERNATIONAL (JP)
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