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专利名称：Threaded joint for steel pipes发明人：Keishi Matsumoto,Kunio Goto,Toshiro
Anraku,Shigeo Nagasaku,Hideo Yamamoto
申请号：US10765837申请日：20040129
公开号：US20040239105A1公开日：20041202
专利附图：
摘要：A threaded joint for steel pipes comprising a pin and a box each having a contactsurface comprising a threaded portion or and an unthreaded metal contact portion isprovided with improved anti-galling propertied by forming a lubricating coating on the
contact surface of at least one of the pin and the box, the lubricating coating exhibiting aself-repairing function by liquid lubrication and having a decreased greasiness. Thelubricating coating is (1) a coating which comprises a lower lubricant layer which is in liquidform in the temperature range of above 0 C. and below 40 C. and an upper lubricant layerwhich is in solid form at 40 C., or (2) a coating which is semi-solid or solid at 40 C. and isformed of a mixture comprising a lubricating oil which is in liquid form in the temperaturerange of above 0 C. and below 40 C. and a wax which is in solid form at 40 C., the mixturepreferably having been heated so as to liquefy the wax and dissolve in each other the waxand lubricant oil.
申请人：MATSUMOTO KEISHI,GOTO KUNIO,ANRAKU TOSHIRO,NAGASAKUSHIGEO,YAMAMOTO HIDEO
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