In view of the special and high requirements of 1500m deep sea steel pipe service environment, HYST has successfully developed X65QO series specification deep sea pipeline pipe, successfully realized the domestic replacement for the first time in China, and applied to China's first deep water self-operated large gas field -- Lingshui 17-2 gas field in the South China Sea, creating a new record for laying China's sea pipe, marking 1542 meters "China depth".