... 1/2"oil drilling pipe :-Drilling pipe,heavy weight drilling pipe,tubing pipe,casing pipe. We can produced drilling pipe(eu,iu ieu) ... treatment, hot straightening, could straightening, ultrasonic inspection on pipe body and pipe end, magnetic particle inspection, friction welding, seam inspection ... of no defects. All threads are machined by CNC Lathes and inspected with API Spec standard thread gauges ...