... B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D, ... magnetic particle inspection. The whole process includes hot upset forging, heat treatment, hot straightening, could straightening, ultrasonic inspection on pipe ... all the roots are cold rolled. The products shall be equipped with pressed steel or plastic steel thread protectors on the connections ...