... A,B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7, ... beam quenching furnace,, hot and cold straighten device, friction welding machine, middle frequency heat treatment, numerical control lathe and compete ... . We have a complete set of inspection process, inspection for raw material, magnetic particle inspection to pipe end, ultrasonic ...