Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
THREADED COUPLING FOR PIPE
Document Type and Number:
WIPO Patent Application WO/2013/057926
Kind Code:
A1
Abstract:
Provided is a threaded coupling for a steel pipe having excellent galling resistance and seal performance as a radial-seal type connector. With this threaded coupling a plating having a Vickers hardness of not less than 310 is applied to the screw portion of the box and the inner surface of the box corresponding to the seal portion, and the seal interference amount ratio of the seal part in the pipe circumferential direction is not less than 0.002 as calculated with δ/D, where D is the seal diameter, defined by the pin outer diameter at the seal point, which is the region on the outer circumferential surface of the nose part on the pin-side that first makes contact with the inner circumferential surface of the nose part on the box-side when the threaded engagement is established, and δ is the amount of interference as defined by the amount by which the diameter of the seal point is reduced when the diameter of the seal point is reduced by the box, when the threaded engagement is established.

Inventors:
YOSHIKAWA MASAKI (JP)
NAGAHAMA TAKUYA (JP)
CHIKATSUNE HIROSHI (JP)
TAKANO JUN (JP)
KAWAI TAKAMASA (JP)
UETA MASATERU (JP)
TAKAHASHI KAZUNARI (JP)
MORIOKA NOBUHIKO (JP)
Application Number:
PCT/JP2012/006607
Publication Date:
April 25, 2013
Filing Date:
October 16, 2012
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
JFE STEEL CORP (JP)
International Classes:
F16L15/04
Foreign References:
JP2005351324A2005-12-22
JP2008215473A2008-09-18
JP2002130552A2002-05-09
JP2006506582A2006-02-23
JP2002130552A2002-05-09
Other References:
See also references of EP 2770239A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Download PDF:
Claims: