Patent ID: 9194515
Filing Date: 2015-11-24
Classification: C10M,C10N,E21B,F16L

Abstract:
1. A threaded joint for pipes comprising a pin and a box, each having a contact surface including a threaded portion and an unthreaded metal contact portion, the unthreaded metal contact portion including a sealing surface and a shoulder surface, the shoulder surface of the pin being located on an end surface of the pin, a non-contacting region in which the pin and the box do not contact each other being present between the sealing surfaces and the shoulder surfaces of the pin and the box, the threaded joint having one or more grooves formed in the shoulder surface of at least one of the pin and the box and extending to the non-contacting region and to an interior of the threaded joint, characterized in that at least the contact surface of at least one of the pin and the box has a solid lubricating coating exhibiting plastic or viscoplastic rheological behavior formed thereon, and a total volume V (mm