[12] Patent
[11] Patent No.:GC0004558  
[45] Date of Publishing the Grant of the Patent: 31/Dec /2016                32/2016  
Number of the Decision to Grant the Patent:2016/90002
Date of the Decision to Grant the Patent:25/Dec/2016

[21] Application No.:GC 2013-23344

[22] Filing Date:19/1/2013

[30] Priority:

[33] State [32] Priority date [31] Priority No.
JP
19/1/2012
JP2012-008922

[72] Inventors:1- Masahiro Oshima،2- Shin Ugai،3- Takashi Okada،4- Masayoshi Sasaki،5- Suguru Yamaguchi،6- Masaaki Sugino

[73] Owners:1- Nippon Steel & Sumitomo Metal Corporation, 6-1, Marunouchi 2-chome, Chiyoda-ku, Tokyo 100-8071, Japan،2- Vallourec Mannesmann Oil & Gas France, 54, rue Anatole France, Aulnoye-Aymeries 59620, France

[74] Agent: Saud M. A. Shawwaf Law Office

  

 

  

[51]IPC:
Int. Cl.: F16L 15/04 (2006.01)

[56] Cited Documents:

-WO 2009/060729 Al (SUMITOMO METAL INDUSTRIES, LTD.) 14 MAY 2009
-WO 2011/027433 Al (SUMITOMO METAL INDUSTRIES, LTD.) 10 MARCH 2011
 
Examiner: Eng. Mohammad W. AlHoshan

[54] THREADED JOINT FOR PIPES
[57] Abstract: A threaded joint for pipes comprises a pin 1 and a box 2 each having a contact surface including a threaded portion 3, 7 and an unthreaded metal contact portion. The unthreaded metal contact portion includes a sealing surface 5, 8 and a shoulder surface 9, 10, 11, 12. The shoulder surface of the pin is located on the end surface of the pin. A non-contacting region 13 in which the pin and the box do not contact each other is present between the sealing surfaces and the shoulder surfaces of the pin and the box. The threaded joint has one or more grooves formed in the shoulder surface of at least one of the pin and the box and extending to the non-contacting region and to the interior of the threaded joint. At least the contact surface of at least one of the pin and the box has a solid lubricating coating exhibiting plastic or viscoplastic rheological behavior formed thereon. The total volume V (mm3) of the grooves and the coating weight W (g) of the solid lubricating coating satisfy the equation V/W ? 24 (mm3/g).
No. of claims: 6     No. of figures: 6


 

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