... quenching furnace,, hot and cold straighten device, friction welding machine, middle frequency heat treatment, numerical control lathe and compete ... heat treatment, hot straightening, could straightening, ultrasonic inspection on pipe body and pipe end, magnetic particle inspection, friction welding, seam inspection. We ... 8” TO 5 1/2” of label 1 or 60.32mm to 139.7mm3) Wall thickness:6.45 to 12 ...