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Title:
THREADED COUPLING FOR PIPE AND METHOD FOR MANUFACTURING THREADED COUPLING FOR PIPE
Document Type and Number:
WIPO Patent Application WO/2021/166100
Kind Code:
A1
Abstract:
Provided is a threaded coupling that is for a pipe, has excellent seizing resistance, and is not susceptible to loosening when used in a horizontal well; also provided is a method for manufacturing this threaded coupling for a pipe. This threaded coupling for a pipe is provided with a pin (3), a box (4), and a Zn-Ni alloy plated layer (100). The pin (3) has a pin contact surface (34) that includes a male threaded portion (31). The box (4) has a box contact surface (44) that includes a female threaded portion (41). The Zn-Ni alloy plated layer (100) is arranged on the pin contact surface (34) and/or the box contact surface (44). The Zn-Ni alloy plated layer (100) contains graphite.

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Inventors:
ISHII KAZUYA (JP)
GOTO KUNIO (JP)
Application Number:
PCT/JP2020/006435
Publication Date:
August 26, 2021
Filing Date:
February 19, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04
Domestic Patent References:
WO2019074103A12019-04-18
Foreign References:
JP2008214666A2008-09-18
JPH06272791A1994-09-27
JP2008214667A2008-09-18
JPH05149485A1993-06-15
JP2020029946A2020-02-27
JPH05149485A1993-06-15
JP2008214666A2008-09-18
Other References:
See also references of EP 4108970A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
Download PDF:
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