Title:
THREADED JOINT FOR STEEL PIPES
Document Type and Number:
WIPO Patent Application WO/2018/135267
Kind Code:
A1
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).
Inventors:
OKU YOUSUKE (JP)
SUGINO MASAAKI (JP)
SUGINO MASAAKI (JP)
Application Number:
PCT/JP2017/046882
Publication Date:
July 26, 2018
Filing Date:
December 27, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04; E21B17/042
Foreign References:
| JP2005511990A | 2005-04-28 | |||
| JPS4899718A | 1973-12-17 | |||
| JP2008527256A | 2008-07-24 | |||
| JP2007504420A | 2007-03-01 | |||
| JP2014101983A | 2014-06-05 |
Other References:
See also references of EP 3572701A4
Attorney, Agent or Firm:
UEBA, Hidetoshi (JP)
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