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Title:
SCREW JOINT FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2018/216366
Kind Code:
A1
Abstract:
Provided is a screw joint which is for steel pipes and has excellent sealing performance. This screw joint (1) for steel pipes is provided with a pin (10) and a box (20). The pin (10) has a nose section (11), a pin shoulder surface (12), a pin sealing surface (13), and a male screw section (14). The box (20) has a box shoulder surface (22), a box sealing surface (23), and a female screw section (24). When the position of a portion which is on the pin sealing surface (13) and first contacts an inner peripheral surface of the box (20) during a fastening process is the sealing position (P), the distance in the pipe axis direction from the sealing position (P) to a pin sealing surface (13)-side end of the male screw section (14) is x, and the distance in the pipe axis direction from the tip of the pin (10) to the pin sealing surface (13)-side end of the male screw section (14) is L, x/L is 0.4-0.55.

Inventors:
INOSE, Keita (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:
JP2018/014616
Publication Date:
November 29, 2018
Filing Date:
April 05, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL 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
Domestic Patent References:
WO2012118167A12012-09-07
WO2016059103A12016-04-21
Foreign References:
JP5776222B22015-09-09
JP4535064B22010-09-01
JP2005351324A2005-12-22
JP4535064B22010-09-01
JP5776222B22015-09-09
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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