jinzuan

drill pipes are in accordance with API 5D. The material of drill pipe body are chosen by 1&3 group of API 5D. echnological conditionsPipe joints and tube body strictly according to the selection criteria,for welding zone work procedure complete on C-132-J Friction welding machine, for welding parts carry on quenching and annealing after welding,hardening and tempering treatment. Each performance ...