THREADED JOINT FOR STEEL PIPES - NIPPON STEEL & SUMITOMO METAL CORP

Title:

THREADED JOINT FOR STEEL PIPES

Document Type and Number:

WIPO Patent Application WO/2015/083382

Kind Code:

A1

Abstract:

A threaded joint (1) consists of a pin (13) and a box (12). The pin (13) comprises a shoulder face (59), a seal face (56), and a male threaded portion (51). The box (12) comprises a shoulder face (24), a seal face (22), and a female threaded portion (21). The male threaded portion (51) and the female threaded portion (21) are each a tapered thread for which the longitudinal face has trapezoid-shaped thread ridges (57, 31). The width of the thread ridge (57) of the male threaded portion (51) becomes progressively narrower along the helix of the thread, and the width of a thread groove (62) of the male threaded portion (51) becomes progressively wider along the helix of the thread. The width of the thread groove (42) of the female threaded portion (21) becomes progressively narrower along the helix of the thread, and the width of the thread ridge (31) of the female threaded portion (21) becomes progressively wider along the helix of the thread. By virtue of the present invention, excellent sealing performance can be maintained, seizing during fastening can be suppressed, and manufacturing can be easily performed.

Inventors:

SUGINO MASAAKI (JP)

Application Number:

PCT/JP2014/006079

Publication Date:

June 11, 2015

Filing Date:

December 05, 2014

Export Citation:

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Assignee:

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

International Classes:

F16L15/04

Domestic Patent References:

WO2013108931A1	2013-07-25
WO2012162214A1	2012-11-29
WO2001075347A1	2001-10-11

Foreign References:

US20030168859A1	2003-09-11
JPH06281061A	1994-10-07
JPH07100773A	1995-04-18
JPH0483988A	1992-03-17
JPH09119564A	1997-05-06
JP2012247028A	2012-12-13
JP2010537135A	2010-12-02
JPH09119564A	1997-05-06
JPH1089554A	1998-04-10
JPH09273671A	1997-10-21

Other References: