Title:
THREADED JOINT FOR PIPE AND MANUFACTURING METHOD OF THREADED JOINT FOR PIPE
Document Type and Number:
WIPO Patent Application WO/2017/110686
Kind Code:
A1
Abstract:
A threaded joint for a pipe is provided which comprises a pin and a box and which has excellent seizure resistance, torque properties and corrosion resistance, and which has excellent adhesion to a lubricant coating even when repeatedly exposed to high temperatures and extremely low temperatures; also provided is a manufacturing method of said threaded joint for a pipe. This threaded joint for a pipe is provided with a pin (3) and a box (6). The pin (3) and the box (6) have a contact surface that includes a thread portion (4) (5) and an unthreaded metal contact portion. The threaded joint for a pipe comprises, on the contact surface of the pin (3) and/or of the box (6), an electroplating layer of a Zn-Ni alloy, an impact plating layer of Zn or a Zn alloy, and a lubricant film, in that order from the contact surface side.
Inventors:
GOTO KUNIO (JP)
Application Number:
PCT/JP2016/087611
Publication Date:
June 29, 2017
Filing Date:
December 16, 2016
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04; C23C28/00; E21B17/042
Domestic Patent References:
| WO2009057754A1 | 2009-05-07 | |||
| WO2009072486A1 | 2009-06-11 |
Foreign References:
| JP2002327874A | 2002-11-15 | |||
| JP2008527249A | 2008-07-24 | |||
| JP2008537062A | 2008-09-11 | |||
| JP2004053013A | 2004-02-19 | |||
| JP2008215473A | 2008-09-18 | |||
| JPS6253588B2 | 1987-11-11 | |||
| JP2002221288A | 2002-08-09 |
Other References:
See also references of EP 3396223A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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