THREADED CONNECTION HAVING HIGH GALLING RESISTANCE AND METHOD OF MAKING SAME

摘要

A process for treating a pin having an external threaded portion and a box having an internal threaded portion wherein the process provides a threadable joint having a high galling resistance. One embodiment of the present invention includes applying a lubricant on the threaded portion of at least one of the pin and box. The threadable joint is made up by threadably engaging the threaded portions of the pin and box to a recommended torque according to the American Petroleum Institute and then breaking out the threaded joint. The making up and breaking out step with lubricant applied on the threaded portion of at least one of the pin and box is performed a plurality of times. One of the threaded portions of the pin and box is then case hardened. The threadable joint made from this process is highly resistant to galling without the requirement of any lubricant.

主权项

1. A process for manufacturing tubular components including a pin having an external threaded portion and a box having an internal threaded portion, the manufactured tubular components including the pin and box are capable of forming a dope-free threaded connection having effective galling resistance without the use of a lubricant, the manufacturing process steps comprising:
joining the pin and box to opposite ends of a pipe section to form a tubular component; applying a lubricant on the threaded portion of at least one of the pin and box which have been prepared by machining the threaded portions; making up the threaded connection by threadably engaging the pin threaded portion of one tubular component to the box threaded portion of another tubular component to a recommended make-up torque for the threaded connection according to the American Petroleum Institute and breaking out the threaded connection, wherein the making up and breaking out step with lubricant applied on the threaded portion of at least one of the pin and box is performed a plurality of times inducing plastic deformation; and case hardening the threaded portion of at least one of the pin and box after performing the step of making up and breaking out a plurality of times.