THREADED JOINT FOR STEEL PIPES

Title:

THREADED JOINT FOR STEEL PIPES

Document Type and Number:

WIPO Patent Application WO/2019/093311

Kind Code:

A1

Abstract:

Provided is a threaded joint for steel pipes, having improved sealing performance against internal pressure and external pressure. This threaded joint 1 is provided with a pin 10 and a box 20. The pin 10 includes a male thread 11, a nose 12, a pin shoulder surface 13, and a pin seal surface 14. The box 20 includes a female thread 21, a box shoulder surface 23, and a box seal surface 24. The box seal surface 24 has a seal point SP located at a mid-point on a tapered surface 242 in the direction of a pipe axis CL. The distance LSP between the front end of the nose 12 and the seal point SP in the direction of the pipe axis CL is 13 mm or greater. The shoulder angle α between the pin shoulder surface 13 or the box shoulder surface 23 and a plane VP which is perpendicular to the pipe axis CL is from 2 to 13 degrees. The ratio TB/TP of the wall thickness TB of the box to the wall thickness TP of the pin 10 at the seal point SP is 1.7 or greater.

Inventors:

OKU YOUSUKE (JP)
SUGINO MASAAKI (JP)

Application Number:

PCT/JP2018/041148

Publication Date:

May 16, 2019

Filing Date:

November 06, 2018

Export Citation:

Click for automatic bibliography generation Help

Assignee:

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

International Classes:

F16L15/04

Foreign References:

JP2006526747A	2006-11-24
JP2012247028A	2012-12-13
JP2012506000A	2012-03-08
JP2006526747A	2006-11-24
JP2013029176A	2013-02-07
JP2014013052A	2014-01-23

Other References: