Title:
DUPLEX STAINLESS STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2023/054343
Kind Code:
A1
Abstract:
Provided is a duplex stainless steel material that has a yield strength of not less than 586 MPa, excellent low-temperature toughness, and excellent corrosion resistance. A duplex stainless steel material according to the present disclosure comprises, in terms of mass%, not more than 0.030% C, 0.20-1.00% Si, 0.50-7.00% Mn, not more than 0.040% P, not more than 0.020% S, not more than 0.100% Al, 4.20-9.00% Ni, 20.00-30.00% Cr, 0.50-2.00% Mo, 1.50-4.00% Cu, 0.150-0.350% N, and 0.01-1.50% V, with the remainder being Fe and impurities, and satisfies formula (1) provided in the description. The microstructure comprises 30.0-70.0% by volume of ferrite, with the remainder being austenite. The yield strength is not less than 586 MPa. The number density of Cu deposits having a long diameter of not more than 50 nm in the austenite is 150-1500/μm3.
Inventors:
OKADA SEIYA (JP)
TOMIO YUSAKU (JP)
ARAI YUJI (JP)
TOMIO YUSAKU (JP)
ARAI YUJI (JP)
Application Number:
PCT/JP2022/035897
Publication Date:
April 06, 2023
Filing Date:
September 27, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D8/02; C21D8/06; C21D8/10; C21D9/08; C22C38/00; C22C38/60
Domestic Patent References:
| WO2021033672A1 | 2021-02-25 | |||
| WO2020218426A1 | 2020-10-29 |
Foreign References:
| JP2018193591A | 2018-12-06 | |||
| JP2021167446A | 2021-10-21 | |||
| JP2021167445A | 2021-10-21 | |||
| JPH05132741A | 1993-05-28 | |||
| JPH09195003A | 1997-07-29 | |||
| JP2014043616A | 2014-03-13 | |||
| JP2016003377A | 2016-01-12 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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