THREADED JOINT FOR STEEL PIPES

Title:

THREADED JOINT FOR STEEL PIPES

Document Type and Number:

WIPO Patent Application WO/2020/039750

Kind Code:

A1

Abstract:

The threaded joint for steel pipes disclosed herein comprises: a pin (10) including a tapered male thread part (11) and a shoulder part; and a box including a tapered female thread part and a shoulder part. In a state in which the shoulder parts contact each other and fastening is complete, the thread bottom face (13) of the male thread part (11) interferes with and contacts the thread top face of the female thread part, and a gap is formed between the thread top face (12) of the male thread part (11) and the thread bottom face of the female thread part. In a longitudinal cross-section including the pipe axis (CL) of the threaded joint, the thread top surface (12) of the male thread part (11) comprises a convex curve tangential to both a first edge part (12a) of an arc connecting the thread top face (12) and a load flank face (15) and a second edge part (12b) connecting the thread top face (12) and an insertion flank face (14). A solid lubrication film (30) is provided on the surface of the male thread part (11).

More Like This:

WO/2023/063384	METAL PIPE FOR OIL WELLS
WO/2006/022418	THREADED JOINT FOR STEEL PIPES

Inventors:

SUGINO MASAAKI (JP)

Application Number:

PCT/JP2019/026013

Publication Date:

February 27, 2020

Filing Date:

July 01, 2019

Export Citation:

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Assignee:

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

International Classes:

F16L15/04

Domestic Patent References:

WO2015182128A1	2015-12-03
WO1998050720A1	1998-11-12
WO2007042231A2	2007-04-19
WO2009072486A1	2009-06-11
WO2015182128A1	2015-12-03

Foreign References:

JPH06281059A	1994-10-07
CN201574696U	2010-09-08
CN201763269U	2011-03-16
US20130119657A1	2013-05-16
US4004832A	1977-01-25
US20170321826A1	2017-11-09
CN103362459A	2013-10-23

Other References: