Title:
HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL WELL, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2022/181164
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide: a high-strength stainless steel seamless pipe for an oil well; and a method for producing same. The high-strength stainless seamless steel pipe for an oil well according to the present invention contains: 0.012-0.05 mass% of C; 0.05-0.50 mass% of Si; 0.04-1.80 mass% of Mn; at most 0.030 mass% of P; at most 0.005 mass% of S; 11.0-14.0 mass% of Cr; 0.5-6.5 mass% of Ni; 0.5-3.0 mass% of Mo; 0.005-0.10 mass% of Al; 0.005-0.20 mass% of V; 0.01-0.3 mass% of Co; 0.002-0.15 mass% of N; at most 0.010% of O; and 0.001-0.20 mass% of T, wherein Cr, Ni, Mo, Cu, C, Si, Mn, N and Ti satisfy a predetermined relational expression with the balance comprising Fe and unavoidable impurities, the stainless steel pipe having a steel structure in which the volume percentage of residual austenite is 6-20%, and having a yield strength of 758 MPa or more and an absorption energy vE-60 at -60 °C of 70 J or more.
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Inventors:
EGUCHI KENICHIRO (JP)
YUGA MASAO (JP)
YUGA MASAO (JP)
Application Number:
PCT/JP2022/002813
Publication Date:
September 01, 2022
Filing Date:
January 26, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/10; C21D9/08; C22C38/00; C22C38/58; C22C38/60
Domestic Patent References:
| WO2020071348A1 | 2020-04-09 | |||
| WO2020071344A1 | 2020-04-09 | |||
| WO2020067247A1 | 2020-04-02 | |||
| WO2017168874A1 | 2017-10-05 | |||
| WO2019065115A1 | 2019-04-04 | |||
| WO2021015141A1 | 2021-01-28 |
Foreign References:
| JP2010168646A | 2010-08-05 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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