The demand for LNG fueled tank on ship is growing in accordance with the IMO 2020 regulation. The 9% nickel steel has been used for LNG storage tank because this material has higher tensile strength than the other materials in the IGF code. The nickel-based alloy type welding consumable has been applied on 9% nickel steel welding because of good toughness at cryogenic environment and high tensile property. However that welding consumable has disadvantages of high price and poor weldability. In this study, new stainless steel-based flux-cored wire is developed for 9% nickel steel and mechanical properties are satisfied Class requirement. Additionally, fatigue, FCGR and CTOD test had been carried out to verify structure design suitability.

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