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 (JP)
TAKEDA YUSUKE (JP)
KOCHI YASUHIRO (JP)
MARUTA SATOSHI (JP)
TOYOTA YUSUKE (JP)
TAKEDA YUSUKE (JP)
KOCHI YASUHIRO (JP)
MARUTA SATOSHI (JP)
TOYOTA YUSUKE (JP)
Application Number:
PCT/JP2018/008155
Publication Date:
October 04, 2018
Filing Date:
March 02, 2018
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
F16L15/04; E21B17/042
Domestic Patent References:
| WO2016056222A1 | 2016-04-14 |
Foreign References:
| US20110012349A1 | 2011-01-20 | |||
| JP2015092109A | 2015-05-14 | |||
| JP2002061780A | 2002-02-28 | |||
| JPH11132370A | 1999-05-21 | |||
| JPH08303657A | 1996-11-22 |
Other References:
See also references of EP 3604881A4
Attorney, Agent or Firm:
UEBA, Hidetoshi (JP)
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