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Patent Searching and Data


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 (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
SUGINO, Masaaki (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/041148
Publication Date:
May 16, 2019
Filing Date:
November 06, 2018
Export Citation:
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Assignee:
NIPPON STEEL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
VALLOUREC OIL AND GAS FRANCE (54 rue Anatole France, AULNOYE-AYMERIES, 59620, FR)
International Classes:
F16L15/04
Foreign References:
JP2006526747A2006-11-24
JP2012247028A2012-12-13
JP2012506000A2012-03-08
Attorney, Agent or Firm:
UEBA, Hidetoshi (INTELIX Patent & Law Firm, Xymax Umeda-shinmichi Building 1-5, Dojima 1-chome, Kita-ku, Osaka-sh, Osaka 03, 〒5300003, JP)
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