Title:
HIGH-STRENGTH SEAMLESS STAINLESS STEEL PIPE FOR OIL WELLS
Document Type and Number:
WIPO Patent Application WO/2023/145346
Kind Code:
A1
Abstract:
Provided is a high-strength seamless stainless steel pipe for oil wells. The seamless stainless steel pipe according to the present invention has a component composition that contains, expressed in mass%, C : not more than 0.015%, Si : 0.05 to 0.50%, Mn : 0.04 to 1.80%, P : not more than 0.030%, S : not more than 0.005%, Cr : 11.0 to 14.0%, Ni : more than 2.0% but not more than 5.0%, Mo : at least 0.5% but less than 1.8%, Al : 0.005 to 0.10%, V : 0.005 to 0.20%, Nb : 0.005 to 0.05%, N : less than 0.015%, and O : not more than 0.010%, wherein the Cr, Mo, Si, C, Mn, Ni, Cu, N, V, and Nb satisfy a prescribed relational expression and the balance comprises Fe and unavoidable impurities. The total of the amount of precipitated Nb and the amount of precipitated V is at least 0.002%; the yield strength is at least 758 MPa; vE-60 is at least 20 J; and the corrosion rate is not more than 0.125 mm/y.
Inventors:
EGUCHI KENICHIRO (JP)
IDE SHINSUKE (JP)
IDE SHINSUKE (JP)
Application Number:
PCT/JP2022/047592
Publication Date:
August 03, 2023
Filing Date:
December 23, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/02; C21D9/08; C22C38/00; C22C38/58; C22C38/60
Domestic Patent References:
| WO2021206080A1 | 2021-10-14 | |||
| WO2021210564A1 | 2021-10-21 | |||
| WO2017168874A1 | 2017-10-05 |
Foreign References:
| JP2010168646A | 2010-08-05 | |||
| JP2014025145A | 2014-02-06 | |||
| JP2000226642A | 2000-08-15 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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