Threaded joint for steel pipes
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United States of America Patent
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N/A
Issued Date -
Oct 7, 2004
app pub date -
Jul 25, 2003
filing date -
Jul 25, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A threaded joint for steel pipes which is capable of metal-to-metal sealing and which can be subjected to repeated fastening and unfastening without the application of a liquid lubricant containing a heavy metal powder comprises a pin and a box each having a contact surface including a threaded portion and an unthreaded metal contact portion. The contact surface of at least one of the pin and the box are coated with an undercoating layer and a lubricating coating layer atop it. The undercoating layer is a porous metal coating having a porosity of 5-80% and a thickness of 1-30 .mu.m and preferably a hardness of 50-250 Hv. The lubricating coating is a solid lubricating coating or a liquid lubricating coating, the latter containing substantially no heavy metal powders. The total thickness of the undercoating layer and the lubricating coating layer is at most 100 .mu.m.
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