THREADED JOINT FOR STEEL PIPES

Title:

THREADED JOINT FOR STEEL PIPES

Document Type and Number:

WIPO Patent Application WO/2020/039875

Kind Code:

A1

Abstract:

Disclosed is a threaded joint for steel pipes that comprises a pin (10) and a box (20). The pin (10) includes an annular shoulder surface (12), an annular seal surface (13) adjacent to the shoulder surface (12), and a male thread section (14) in this order from the tip of the pin (10) toward a pipe body (11) of the pin (10). The box (20) includes an annular shoulder surface (22), an annular seal surface (23) adjacent to the shoulder surface (22), and a female thread section (24) in this order from a pipe body (21) of the box (20) toward the tip of the box (20). The pin shoulder surface (12) and the box shoulder surface (22) are tilted from a surface perpendicular to a pipe axis (CL) toward a screw-in direction of the pin (10). The diameter (Dpi) of the inner circumferential edge (12a) of the pin shoulder surface (12) is smaller than the diameter (Dbi) of the inner circumferential edge (22a) of the box shoulder surface (22).

Inventors:

INOSE KEITA (JP)
NAKANO HIKARI (JP)
SUGINO MASAAKI (JP)

Application Number:

PCT/JP2019/030172

Publication Date:

February 27, 2020

Filing Date:

August 01, 2019

Export Citation:

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Assignee:

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

International Classes:

F16L15/04

Foreign References:

JP2017072187A	2017-04-13
JP2013511672A	2013-04-04
JP2005526936A	2005-09-08
JPH09119565A	1997-05-06
JPH1096489A	1998-04-14

Other References: