Title:
MARTENSITE STAINLESS STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2023/195361
Kind Code:
A1
Abstract:
Provided is a martensite stainless steel material having high strength, excellent SSC resistance, and excellent low-temperature toughness. The martensite stainless steel material according the present disclosure contains, by mass%, 0.030% or less C, 1.00% or less Si, 1.00% or less Ma, 0.030% or less P, 0.0050% or less S, 10.00-14.00% Cr, 5.00-7.50% Ni, 1.10-3.50% Mo, 0.005-0.050% Al, 0.01-0.30% V, 0.0030-0.0500% N, 0.020-0.150% Ti, 1.00-3.50% Cu, and 0.010-0.500% Co, with the remainder being Fe and impurities. The martensite stainless steel material has a yield strength of 758 MPa or greater, an area ratio of δ ferrite of 5.00% or less, and a rolling-direction length L (μm) and rolling-direction distance D (μm) of δ ferrite that satisfy formula (1). (1): L/D ≤ 10.5
Inventors:
NISHIMURA TOSHIYA (JP)
KANKI KYOHEI (JP)
KANKI KYOHEI (JP)
Application Number:
PCT/JP2023/011890
Publication Date:
October 12, 2023
Filing Date:
March 24, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C22C38/60
Domestic Patent References:
| WO2021210564A1 | 2021-10-21 | |||
| WO2020067247A1 | 2020-04-02 | |||
| WO2020095559A1 | 2020-05-14 | |||
| WO2018079111A1 | 2018-05-03 | |||
| WO2019065115A1 | 2019-04-04 |
Foreign References:
| JPH08120336A | 1996-05-14 | |||
| JPH04224659A | 1992-08-13 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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