Threaded joint for steel pipe and process for producing the same

Threaded joint for steel pipe and process for producing the same

  • CN 1,938,542 B
  • Filed: 04/05/2005
  • Issued: 11/30/2011
  • Est. Priority Date: 04/06/2004
  • Status: Active Grant
First Claim
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1. screw joint for steel pipe, it is made of tool joint pin that possesses contact surface respectively and female joint, described contact surface has screw section and no threaded metal contacting part, it is characterized in that, be formed with the solid lubrication tunicle at least one side'"'"'s of described tool joint pin and female joint contact surface, this solid lubrication tunicle contains:

  • the lubricity powder of selecting from graphite, mica, calcium carbonate and white clay more than a kind or 2 kinds;

    Copper powder;

    And bond, its surface of described copper powder is passivated processing, passivation is for remaining in copper powder in the high-temperature atmosphere at surface formation cupric oxide epithelium, or copper powder heated in the air-flow of hydrogen and hydrogen sulfide and form the cuprous sulfide epithelium on the surface, perhaps contact with matal deactivator and form epithelium, the content C of the copper powder in the described solid lubrication epithelium is 0.5~

    5.0 with respect to the mass ratio C/B of the content B of described lubricity powder.

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