Title:
THREADED COUPLING FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2020/075365
Kind Code:
A1
Abstract:
Provided is a threaded coupling a for steel pipe with which both high torque performance and high tension performance can be achieved. A threaded coupling 1 is provided with a tubular pin 10 formed in one distal end of a steel pipe, and a tubular box 20 into which the pin 10 is inserted and which is fastened to the pin 10. The pin 10 includes a male thread 11 formed in the outer periphery of the pin 10 and configured from a sphenic thread. The box 20 includes a female thread 21 corresponding to the male thread 11, formed in the inner periphery of the box 20, and configured from a sphenic thread. The threaded coupling 1 satisfies formula (1). In formula (1), LP is the pitch between load surfaces 111 of the male thread 11, and SP is the pitch between insertion surfaces 112 of the male thread 11. 3% ≤ (LP − SP) / LP ≤ 8% (1)
Inventors:
OKU YOUSUKE (JP)
DOUCHI SADAO (JP)
DOUCHI SADAO (JP)
Application Number:
PCT/JP2019/028958
Publication Date:
April 16, 2020
Filing Date:
July 24, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
VALLOUREC OIL & GAS FRANCE (FR)
VALLOUREC OIL & GAS FRANCE (FR)
International Classes:
F16L15/00; E21B17/042; F16L15/06
Domestic Patent References:
| WO2015194193A1 | 2015-12-23 | |||
| WO2015194193A1 | 2015-12-23 |
Foreign References:
| JP2015534614A | 2015-12-03 | |||
| JP2012512347A | 2012-05-31 | |||
| JP2005523404A | 2005-08-04 | |||
| US0030647A | 1860-11-13 | |||
| US6158785A | 2000-12-12 | |||
| JP2012512347A | 2012-05-31 |
Other References:
See also references of EP 3865752A4
Attorney, Agent or Firm:
UEBA, Hidetoshi (JP)
Download PDF: