Steel used for LNG storage tanks
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What are the advantages and disadvantages of 9-nickel steel and stainless steel for inner tanks in LNG storage tanks?
Materials should be selected based on the design temperature...
9Ni steel can withstand low temperatures down to 296 degrees; its drawback is its poor weldability, as it is prone to cold cracking. Stainless steel can withstand low temperatures down to 196,
9 nickel steel is cheap but difficult to manufacture; stainless steel is expensive, but easy to manufacture
9Ni steel plates possess excellent low-temperature impact resistance and an extremely low coefficient of thermal deformation. It is delivered in a quenched and tempered heat treatment condition. To improve the toughness of the steel, intermediate heat treatment (secondary quenching) can also be carried out; for steel plates with a thickness of no more than 12 mm, they can also be delivered in a condition of two normalizations followed by tempering, with the tempering temperature being no less than 620 °C.