Title:
HIGH-STRENGTH STAINLESS STEEL SEAMLESS PIPE FOR OIL WELL, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2021/200571
Kind Code:
A1
Abstract:
Provided are a high-strength stainless steel seamless pipe or an oil well, and a method for producing the same. This high-strength stainless steel seamless pipe for an oil well has a component composition which satisfies a predetermined formula and which contains, in terms of mass%, 0.002-0.05% C, 0.05-0.50% Si, 0.04-1.80% Mn, no more than 0.030% P, no more than 0.002% S, more than 14.0% and no more than 17.0% Cr, 4.0-8.0% Ni, 1.5-3.0% Mo, 0.005-0.10% Al, 0.005-0.20% V, 0.01-1.0% Co, 0.002-0.15% N, and no more than 0.006% O, the remainder comprising Fe and unavoidable impurities, and the high-strength stainless steel seamless pipe for an oil well has a structure in which the average diameter of prior austenite grains is 40 µm or less, and the yield strength thereof is 758 MPa or greater.
Inventors:
EGUCHI KENICHIRO (JP)
YUGA MASAO (JP)
YUGA MASAO (JP)
Application Number:
PCT/JP2021/012626
Publication Date:
October 07, 2021
Filing Date:
March 25, 2021
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/10; C21D9/08; C21D9/50; C22C38/58
Domestic Patent References:
| WO2017168874A1 | 2017-10-05 | |||
| WO2018131340A1 | 2018-07-19 | |||
| WO2017010036A1 | 2017-01-19 | |||
| WO2020013197A1 | 2020-01-16 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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