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Title:
THREADED JOINT FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2023/238864
Kind Code:
A1
Abstract:
Provided is a threaded joint which is for a steel pipe and which can improve seizure resistance performance and manufacturability. A threaded joint 1 for a steel pipe comprises: a pin 10; and a box 20. The pin 10 has a male screw 11, an inner pin seal surface 12, and an outer pin seal surface 13. The box 20 has a female screw 12, an inner box seal surface 12, and an outer box seal surface 23. The male screw 11 includes a tapered region 111 positioned on the outer pin seal surface 13 side, and a tapered region 112 positioned on the inner pin seal surface 11 side. The gradient β1 of the tapered region 112 is smaller than the gradient α1 of the tapered region 111. The insertion surface pitch of screw threads included in the male screw 112 is constant. The screw threads included in the tapered region 112 have a screw thread width wider than that of screw threads included in the tapered region 111.

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Inventors:
INOSE KEITA (JP)
KURIO SATOSHI (JP)
TSUJIMURA TAKUYA (JP)
SASAKI MASAYOSHI (JP)
KURANISHI TAKAO (JP)
Application Number:
PCT/JP2023/021005
Publication Date:
December 14, 2023
Filing Date:
June 06, 2023
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/04
Domestic Patent References:
WO2018135536A12018-07-26
WO2022090034A12022-05-05
WO2021013646A12021-01-28
Foreign References:
JP2005523404A2005-08-04
JP6916277B22021-08-11
JP2008215473A2008-09-18
JP2022008003A2022-01-13
JPH0280886A1990-03-20
US4588213A1986-05-13
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
Download PDF:
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