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1. (WO2018135267) THREADED JOINT FOR STEEL PIPES

Pub. No.:    WO/2018/135267    International Application No.:    PCT/JP2017/046882
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Thu Dec 28 00:59:59 CET 2017
IPC: F16L 15/04
E21B 17/042
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
VALLOUREC OIL AND GAS FRANCE
バローレック・オイル・アンド・ガス・フランス
Inventors: OKU, Yousuke
奥 洋介
SUGINO, Masaaki
杉野 正明
Title: THREADED JOINT FOR STEEL PIPES
Abstract:
Provided is a threaded joint for steel pipes, the threaded joint having further improved sealing performance. This threaded joint (1) is provided with a pin (10) and a box (20). The pin (10) has a pin shoulder surface (11), a pin seal surface (12), and a male thread section (13). The box (20) has a box shoulder surface (21), a box seal surface (22), and a female thread section (23). The male thread section (13) and the female thread section (23) comprise wedge-shaped threads. In a tightened state, the pin shoulder surface (11) is in contact with the box shoulder surface (21), the insertion surface and load surface of the male thread section (13) are respectively in contact with the insertion surface and load surface of the female thread section (23), and the pin seal surface (12) is in contact with the box seal surface (22). The shoulder angle is 4° or greater. The shoulder angle is an angle formed in a non-tightened state by each of the shoulder surfaces (11, 21) with a plane perpendicular to a pipe axis (CL).