Nippon Steel Corporation

Yasuhiro Kochi

Michihiko Iwamoto

Yusuke Toyota

Yusuke Takeda

Satoshi Maruta

A threaded connection for steel pipe is provided that can be made up quickly and appropriately. The threaded connection includes a steel pipe, a steel pipe, and a couplingfor connecting the steel pipesand. The pipe bodiesandof the steel pipesandinclude annular marking groovesand, respectively, formed on the outer peripheries of the pipe bodiesand

Threaded connection for steel pipe

A threaded connection for steel pipe is provided that prevents cross-threading and provides good compression load resistance. A threaded connection () includes a pin () and a box (). The male thread stabbing flank () of the pin () includes two male thread stabbing flank portions () and (). The male thread stabbing flank portion () is located farther from the pipe axis (X) of the steel pipe () and has a stabbing flank angle (&#x3b1;1) of &#x2212;10 to 15 degrees. The male thread stabbing flank portion () is located closer to the pipe axis (X) and has a stabbing flank angle (&#x3b1;2) of 20 to 60 degrees. The female thread stabbing flank () of the box () includes two female thread stabbing flank portions () and (). The female thread stabbing flank portion () is located farther from the pipe axis (X) and has a stabbing flank angle (&#x3b1;1) equal to the stabbing flank angle (&#x3b1;1) of the male thread stabbing flank portion (). The female thread stabbing flank portion () is located closer to the pipe axis (X) and has a stabbing flank angle (&#x3b1;2) equal to the stabbing flank angle (&#x3b1;2) of the male thread stabbing flank portion ().

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Tokyo, Japan

Yasuhiro Kochi