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Patent Searching and Data


Title:
THREADED JOINT FOR STEEL PIPES
Document Type and Number:
WIPO Patent Application WO/2019/111803
Kind Code:
A1
Abstract:
Provided is a threaded joint for steel pipes, having improved fatigue-resistant properties achived while seizure-resistant properties are ensured. This threaded joint comprises a pin and a box. The pin includes a tapered male thread section (11), and the box includes a tapered female thread section (21) engaging with the tapered male thread section (11). The male thread section (11) is divided in the direction of a pipe axis (CL) into a first region (15) on the front end side of the pin, and a second region (16) on the pipe body side of the pin. The taper rate (Tp1) of the first region (15) is higher than the taper rate (Tp2) of the second region (16). The taper rate (Tp1) of the first region (15) is higher than the taper rate (Tb) of the female thread section (21). The taper rate (Tp2) of the second region (16) is equal to or higher than the taper rate (Tb) of the female thread section (21).

Inventors:
ANDO, Yoshinori (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
UGAI, Shin (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
OKU, Yousuke (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/044038
Publication Date:
June 13, 2019
Filing Date:
November 29, 2018
Export Citation:
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Assignee:
NIPPON STEEL 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
Foreign References:
JPS60116994A1985-06-24
JP2002349775A2002-12-04
JP2012031988A2012-02-16
JPS5652195B21981-12-10
JP2007232012A2007-09-13
JPH11132370A1999-05-21
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (5-17, Dojima 1-chome Kita-ku, Osaka-sh, Osaka 03, 〒5300003, JP)
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