Threaded connection for pipe or tube and method for producing the threaded connection for pipe or tube

Abstract

The present invention has an objective to provide a threaded connection for pipe or tube including a pin and a box, having excellent galling resistance, torque property, and anticorrosion property, and still having an excellent adhesiveness with a lubricating coating even when being repeatedly exposed to high temperature and very low temperature, and to provide a method for producing the threaded connection for pipe or tube. The threaded connection for pipe or tube according to the present embodiment includes a pin and a box. The pin and the box have contact surfaces including a thread portions and and unthreaded metal contact portions, respectively. The threaded connection for pipe or tube comprises an electroplating layer consisting of a Zn—Ni alloy, a mechanical plating layer consisting of Zn or a Zn alloy, and a lubricating coating, on the contact surface of at least one of the pin and the box, in this order from a contact surface side.

Dependencies are inferred from the claim text.