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Title:
PIPE THREADED JOINT, AND METHOD FOR PRODUCING PIPE THREADED JOINT
Document Type and Number:
WIPO Patent Application WO/2019/044961
Kind Code:
A1
Abstract:
The present invention provides a pipe treaded joint and a method for producing the same. The pipe threaded joint is provided with a pin (4), a box (5), and a Zn-Ni alloy-coated layer (6). The pin (4) has a pin-side contact surface (40) including a pin-side threaded portion (41). The box (5) has a box-side contact surface (50) including a box-side threaded portion (51). The Zn-Ni alloy-coated layer (6) is disposed on at least one among the pin-side contact surface (40) and the box-side contact surface (50). The Zn-Ni alloy-coated layer (6) is composed of Zn, Ni, trace Cr, and impurities. The content of trace Cr in the Zn-Ni alloy-coated layer (6) is at least 5.0×10 counts/second in terms of Cr intensity as measured by secondary ion mass spectrometry using O2 + as an ion source.

Inventors:
KIMOTO, Masanari (7-1, Yurakucho 1-chome, Chiyoda-k, Tokyo 06, 〒1000006, JP)
OSHIMA, Masahiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/032090
Publication Date:
March 07, 2019
Filing Date:
August 30, 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:
F16L15/04; C25D5/26; C25D5/36; C25D7/04; F16L15/00; F16L58/08
Domestic Patent References:
WO2017047722A12017-03-23
WO2017110686A12017-06-29
WO2017110685A12017-06-29
WO2016170031A12016-10-27
Foreign References:
JPS5767188A1982-04-23
JPS5550484A1980-04-12
JPH06212443A1994-08-02
JP2008215473A2008-09-18
JPH05112891A1993-05-07
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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