... B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7 ... API drill pipes are of high physical property, for their strictly controlled processing of sulphur and phosphorus.To ensure the materials to ... phosphated or coppered, and all the roots are cold rolled. The products shall be equipped with pressed steel or plastic steel thread protectors on ...