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Title:
OIL-WELL-PIPE SCREW JOINT AND METHOD FOR MANUFACTURING OIL-WELL-PIPE SCREW JOINT
Document Type and Number:
WIPO Patent Application WO/2018/216475
Kind Code:
A1
Abstract:
The present invention provides an oil-well-pipe screw joint that exhibits superior corrosion resistance and seizure resistance, and a manufacturing method therefor. In particular, the method for manufacturing the oil-well-pipe screw joint is a method for manufacturing an oil-well-pipe screw joint that is provided with a pin (3) and a box (4). The manufacturing method includes: a Zn-Ni-alloy-plated-layer forming step for forming a Zn-Ni alloy plated layer (100); and a chromate-coating forming step for forming a chromate coating (200) after the Zn-Ni-alloy-plated-layer forming step. The chromate-coating forming step includes a chromate treatment step and a drying step. The chromate-coating forming step satisfies at least one condition selected from the following conditions 1-3. Condition 1: the velocity at which a chromate treatment liquid is stirred in the chromate treatment step is 0.5 m/s or greater in terms of the linear velocity. Condition 2: the chromate treatment time in the chromate treatment step is less than 50 seconds. Condition 3: the drying temperature in the drying step is 60ºC or less.

Inventors:
KIMOTO, Masanari (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
OSHIMA, Masahiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/018035
Publication Date:
November 29, 2018
Filing Date:
May 10, 2018
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:
C23C22/77; C23C22/30; C23C28/00; C25D7/04; F16L15/04
Domestic Patent References:
WO2017047722A12017-03-23
Foreign References:
JP2007277640A2007-10-25
JPS5881978A1983-05-17
JPS5792762U1982-06-08
JPH10212587A1998-08-11
JP2008215473A2008-09-18
JP2003074763A2003-03-12
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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