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Patent Searching and Data


Title:
THREADED JOINT FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2018/180218
Kind Code:
A1
Abstract:
Provided is a threaded joint for a steel pipe, in which a cross thread is less likely to occur and which has good resistance to compression loads. A threaded joint (10) is provided with a pin (30) and a box (40). A male thread stabbing surface (34) of the pin (30) has two male thread stabbing steps (341, 342). The male thread stabbing step (341) is formed on a side farther from the pipe axis X of the steel pipe (20), and has a stabbing angle (α1) of -10 to 15 degrees. The male thread stabbing step (342) is formed on a side closer to the pipe axis (X), and has a stabbing angle (α2) of 20 to 60 degrees. A female stabbing surface (44) of the box (40) has two female thread stabbing steps (441, 442). The female thread stabbing step (441) is formed on a side farther from the pipe axis (X), and has a stabbing angle (α1) equal to the stabbing angle (α1) of the male thread stabbing step (341). The female thread stabbing step (442) is formed on a side closer to the pipe axis (X), and has a stabbing angle (α2) equal to the stabbing angle (α2) of the male thread stabbing step (342).

Inventors:
IWAMOTO, Michihiko (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TAKEDA, Yusuke (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
KOCHI, Yasuhiro (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
MARUTA, Satoshi (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
TOYOTA, Yusuke (6-1 Marunouchi 2-chome, Chiyoda-k, Tokyo 71, 〒1008071, JP)
Application Number:
JP2018/008155
Publication Date:
October 04, 2018
Filing Date:
March 02, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORPORATION (6-1 Marunouchi 2-chome, Chiyoda-ku Tokyo, 71, 〒1008071, JP)
International Classes:
F16L15/04; E21B17/042
Domestic Patent References:
WO2016056222A12016-04-14
Foreign References:
US20110012349A12011-01-20
JP2015092109A2015-05-14
JP2002061780A2002-02-28
JPH11132370A1999-05-21
JPH08303657A1996-11-22
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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