LNG Cryogenic Tank Plate Selection

Key Technologies for LNG Storage Tank Plate Selection
Due to its excellent low-temperature toughness, weldability, and crack propagation resistance at -162°C cryogenic conditions, 9% nickel steel (Ni9) is the preferred core material for the inner tank of LNG storage tanks. Its coefficient of thermal expansion is highly compatible with concrete outer tanks, and the vacuum insulation design can effectively prevent BOG generation. Austenitic stainless steel (such as 304L) is mostly used for secondary barrier systems and requires ASTM A240 standard certification.

Optimization Suggestions for Material Adaptability
Selection needs to comprehensively consider NACE MR0175 requirements for sulfur corrosion resistance and ASME BPVC VIII-1 pressure vessel specifications. It is recommended to use a multi-layer composite structure: nickel steel main pressure-bearing layer + aluminum alloy leak-proof film + polyurethane foam cold insulation layer, and verify the fatigue life of the material under liquid hydrogen impact load through finite element analysis (usually requiring more than 10^6 cycles).