... X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2 ... cold straighten device, friction welding machine, middle frequency heat treatment, numerical control lathe and compete set of ultrasonic ... hot upset forging, heat treatment, hot straightening, could straightening, ultrasonic inspection on pipe body and pipe end, magnetic particle ...