... B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7, ... numerical control lathe and compete set of ultrasonic inspection and magnetic particle inspection. The whole process includes hot upset forging, ... and pipe end, magnetic particle inspection, friction welding, seam inspection. We strictly carry out API spec Q1 quality control system and ...