Title:
SCREW JOINT FOR PIPE AND METHOD FOR MANUFACTURING SCREW JOINT FOR PIPE
Document Type and Number:
WIPO Patent Application WO/2020/021710
Kind Code:
A1
Abstract:
The present invention provides: a screw joint (1) which is for a pipe and has excellent seizure resistance; and a method for manufacturing the screw joint (1) for a pipe. The screw joint (1) for a pipe according to the present embodiment includes a pin (4), a box (5), and a Zn-Co alloy plating layer (6). The pin (4) has a pin-side contact surface (40) including a pin-side screw portion (41). The box (5) has a box-side contact surface (50) including a box-side screw portion (51). The Zn-Co alloy plating layer (6) is disposed on at least one among the pin-side contact surface (40) and the box-side contact surface (50). The Zn-Co alloy plating layer (6) is composed of Zn, 5-25 mass% of Co, and impurities.
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Inventors:
ISHII KAZUYA (JP)
GOTO KUNIO (JP)
KIMOTO MASANARI (JP)
GOTO KUNIO (JP)
KIMOTO MASANARI (JP)
Application Number:
PCT/JP2018/028282
Publication Date:
January 30, 2020
Filing Date:
July 27, 2018
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04; F16L15/08
Domestic Patent References:
| WO2009057754A1 | 2009-05-07 |
Foreign References:
| JPS5831097A | 1983-02-23 | |||
| JP2002348587A | 2002-12-04 | |||
| JP2015092109A | 2015-05-14 | |||
| JP2006112594A | 2006-04-27 | |||
| JPS62188883A | 1987-08-18 | |||
| JP2018123831A | 2018-08-09 | |||
| JP2018123346A | 2018-08-09 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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