THREADED JOINT FOR STEEL PIPES
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United States of America Patent
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app pub date -
May 26, 2015
filing date -
May 30, 2014
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Abstract
A threaded joint has a solid coating formed on a surface of a male threaded portion thereof, the solid coating having fluidity during application and being cured after the application. In a made-up state, clearances are provided between flat crests of the male threaded portion and flat roots of a female threaded portion which face each other. The crests of the male threaded portion have a helical groove previously formed therein, the helical groove having a lead angle equal to the lead angle of the threads. The groove has a maximum depth of at least 30 μm, the depth being at most one-fifth of a height of the threads. In this threaded joint, the occurrences of galling and an abnormal make-up torque can be prevented during make-up without compromising the strength properties of the threaded joint.
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