Title:
STEEL PIPE FOR OIL WELL
Document Type and Number:
WIPO Patent Application WO/2022/230595
Kind Code:
A1
Abstract:
Provided is a steel pipe for an oil well, the pipe comprising a Zn-Ni alloy plating layer having excellent seizure resistance. The steel pipe for an oil well according to the present disclosure comprises: a pipe body including a pin that includes a pin contact surface, and a box that includes a box contact surface; and a Zn-Ni alloy plating layer formed on at least one of the pin contact surface and the box contact surface. The chemical composition of the pipe body contains, in mass%, C: 0.01–0.60%, Cr: 0–8.0%, and Fe: 80.0% or more. Furthermore, when a C-enriched layer is defined as a region containing 1.5 times or more the C content of the pipe body in mass%, the thickness of the C-enriched layer of the pipe body in the wall thickness direction is 0–1.50 μm.
Inventors:
OSHIMA MASAHIRO (JP)
KIMOTO MASANARI (JP)
KIMOTO MASANARI (JP)
Application Number:
PCT/JP2022/016384
Publication Date:
November 03, 2022
Filing Date:
March 31, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
E21B17/00; E21B17/042; F16L15/04
Domestic Patent References:
| WO2020149310A1 | 2020-07-23 | |||
| WO2009057754A1 | 2009-05-07 | |||
| WO2016170031A1 | 2016-10-27 |
Foreign References:
| JP2008527249A | 2008-07-24 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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