... L80 K55,,,, P110;4. Standard: API Spec 5 CT.5. My company can make for steel pipe outside corrosion ... 73-139.7 - Φ rod body 244.5 mm, light tube and Φ casing 73-88.9 mm tubing lightpipes heat treatment ... one of the leading technology of production line. Light tube computation, can achieve heat treatment capacity in six million ... examination, magnetic powder detection test.. drilling field oil tube(API)