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Title:
SCREW JOINT FOR PIPE AND MANUFACTURING METHOD FOR SCREW JOINT FOR PIPE
Document Type and Number:
WIPO Patent Application WO/2018/003455
Kind Code:
A1
Abstract:
Provided is a screw joint for a pipe of which the fastening torque can be easily adjusted. The screw joint for a pipe according to the present embodiment is provided with a pin (3) and a box (4). The pin (3) and the box (4) are provided with contact surfaces respectively comprising screw parts (31) and (41), metal seal parts (32) and (42) and shoulder parts (33) and (43). In the screw joint for a pipe, the contact surface of one of the pin (3) and the box (4) is provided with a Zn-Ni alloy plating layer (100) and the contact surface of the other is provided with a Cu-Sn-Zn alloy plating layer (110). In the screw joint for a pipe, at least one of the Zn-Ni alloy plating layer (100) and the Cu-Sn-Zn alloy plating layer (110) is further provided with a liquid or semisolid lubrication film (200).

Inventors:
GOTO, Kunio (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2017/021396
Publication Date:
January 04, 2018
Filing Date:
June 08, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
VALLOUREC OIL AND GAS FRANCE (54 rue Anatole France, AULNOYE-AYMERIES, 59620, FR)
International Classes:
F16L15/00; F16L15/04
Domestic Patent References:
WO2015198557A12015-12-30
WO2009057754A12009-05-07
Foreign References:
JP2015506445A2015-03-02
JPS5817285A1983-02-01
JP2008095019A2008-04-24
JPH08120499A1996-05-14
JP2008215473A2008-09-18
JP2003074763A2003-03-12
JP2005514573A2005-05-19
JP2008095019A2008-04-24
JP2002327874A2002-11-15
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (5-17, Dojima 1-chome Kita-ku, Osaka-sh, Osaka 03, 〒5300003, JP)
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