THREADED JOINT FOR PIPE AND METHOD FOR MANUFACTURING THREADED JOINT FOR PIPE

Title:

THREADED JOINT FOR PIPE AND METHOD FOR MANUFACTURING THREADED JOINT FOR PIPE

Document Type and Number:

WIPO Patent Application WO/2018/074212

Kind Code:

A1

Abstract:

Provided is a threaded joint for a pipe having excellent seizing resistance and an excellent external appearance; also provided is a manufacturing method therefor. An embodiment of this threaded joint for a pipe is equipped with a pin (3) and a box (4). The pin (3) and the box (4) have respective contact surfaces (34) and (44) that include threaded portions (31) and (41), metal seal sections (32) and (42), and shoulder sections (33) and (43). This threaded joint for a pipe is provided with a Zn-Ni alloy plated layer (100) on the contact surface (34) and/or (44) of the pin (3) and the box (4). The Zn-Ni alloy plated layer (100) contains Cu. The content ratio of Cu in the Zn-Ni alloy plated layer (100) is no greater than 4.5 mass% (but not 0).

Inventors:

KIMOTO MASANARI (JP)
OSHIMA MASAHIRO (JP)

Application Number:

PCT/JP2017/035859

Publication Date:

April 26, 2018

Filing Date:

October 02, 2017

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)

International Classes:

F16L15/04; C25D5/26; C25D5/48; C25D7/04

Domestic Patent References:

WO2016170031A1	2016-10-27
WO2017110685A1	2017-06-29
WO2016170031A1	2016-10-27

Foreign References:

JPS5817285A	1983-02-01
JPS5925996A	1984-02-10
JPS5836070B2	1983-08-06
JP2013108556A	2013-06-06
JPH05500842A	1993-02-18
JP2002327874A	2002-11-15
JP2016511807A	2016-04-21
JP2008215473A	2008-09-18
JP2003074763A	2003-03-12
JPS63243299A	1988-10-11
JP2008215473A	2008-09-18
JP2003074763A	2003-03-12

Other References: