... B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7, ... , middle frequency heat treatment, numerical control lathe and compete set of ultrasonic inspection and magnetic particle inspection. The whole process ... and API Spec 5DP production standard. We have a complete set of inspection process, inspection for raw material, magnetic particle ...