Research Status of Welding Technology of 9%Ni Steel and Its Welding Consumables

9%Ni steel is the mainstream material for manufacturing liquefied natural gas (LNG) storage containers.The selection and welding technology of welding consumables are the difficulties and key points in manufacturing of LNG storage containers, which has attracted much attention. The specification requirements of composition and mechanical properties of 9%Ni steel and its welding consumables in different countries were summarized, the weldability of 9%Ni steel, the selection principles of welding materials and methods and the welding control key points were analyzed. The development prospect of 9%Ni steel welding consumables and welding technology was also discussed.