Title:
DUPLEX STAINLESS STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2024/085155
Kind Code:
A1
Abstract:
Provided is a duplex stainless steel material having high strength and excellent corrosion resistance. This duplex stainless steel material contains, in mass%, 0.030% or less of C, 0.20-1.00% of Si, 0.5-7.0% of Mn, 0.040% or less of P, 0.0200% or less of S, 0.100% or less of Al, 4.0-9.0% of Ni, 20.0-30.0% of Cr, 0.5-2.0% of Mo, 1.5-3.0% of Cu, 0.15-0.30% of N, 0.01-0.50% of V, 0.05-1.00% of Co, and 0.001-0.050% of Sn, with the remainder comprising Fe and impurities, has a yield strength of at least 758 MPa, and has a microstructure composed of 35-65 vol% of ferrite with the remainder comprising austenite, wherein ρ(α) and ρ(γ), which are the dislocation density in ferrite and the dislocation density in austenite, respectively, satisfy expression (1). (1): 0.3<ρ(γ)/(α)<4.0
Inventors:
OKADA SEIYA (JP)
NAKANE KAZUYA (JP)
ARAI YUJI (JP)
KONDO KEIICHI (JP)
NAKANE KAZUYA (JP)
ARAI YUJI (JP)
KONDO KEIICHI (JP)
Application Number:
PCT/JP2023/037585
Publication Date:
April 25, 2024
Filing Date:
October 17, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/00; C22C38/60
Domestic Patent References:
| WO2020203938A1 | 2020-10-08 | |||
| WO2021246118A1 | 2021-12-09 |
Foreign References:
| JP2018193591A | 2018-12-06 | |||
| JP2021167445A | 2021-10-21 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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