Title:
耐久性に優れた油井管用ねじ継手
Document Type and Number:
Japanese Patent JP5725094
Kind Code:
B2
Abstract:
The prior art cannot suppress the plastic deformation of the whole pin distal end when a compressive load is applied, deteriorating durability of threaded joint. Provided is a premium threaded joint where a pin-side shoulder angle ¸1, a box-side shoulder angle ¸2, a seal interference quantity ´ and a seal point distance xp satisfy a relationship expressed by ¸2-¸1=±x´/xp, ±=7 to 14, and a pin distal end thickness tp1 which is defined by a difference Re-Ri between a radius Re of a pin most distal end portion and an inner radius Ri of a pin distal end portion is 0.25 times or more as large as a pin raw pipe thickness tp0.
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| JP6519030 | Threaded joints for oil country steel pipes |
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Inventors:
Takai Kawai
Issei Takahashi
Hiroshi Kinjo
Masaki Yoshikawa
Jun Takano
Takuya Nagahama
Ueda Masateru
Issei Takahashi
Hiroshi Kinjo
Masaki Yoshikawa
Jun Takano
Takuya Nagahama
Ueda Masateru
Application Number:
JP2013157315A
Publication Date:
May 27, 2015
Filing Date:
July 30, 2013
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
F16L15/04
Domestic Patent References:
| JP2013524116A | ||||
| JP2013029177A | ||||
| JP2000314490A | ||||
| JP10096489A | ||||
| JP9152067A |
Foreign References:
| WO2012056500A1 |
Attorney, Agent or Firm:
Kenichiro Ochiai