Spiral Welded Oil Drilling Pipes 1.OD: 10.3 ... ,X46,X52,X56,X60,X65,X70,X Spiral Welded Oil Drilling Pipes We can produced drilling pipe( ... treatment, numerical control lathe and compete set of ultrasonic inspection and magnetic particle inspection. The whole process ... upset forging, heat treatment, hot straightening, could straightening, ultrasonic inspection on pipe body and pipe end, magnetic particle ...