9 Nickel steel material has small shrinkage at low temperature, small volume change and good toughness at low temperature.
But in terms of cost, 9 nickel steel is much more expensive than 304.
At present, there are two main standards in the field of LNG onshore design, installation, production, storage and transportation-American standard NFPA 59a-LNG production, storage and treatment standard and EU standard EN1473-LNG installation and equipment-offshore device design.
China has GB/T 20368-20 12 "Production, Storage and Shipping of Liquefied Natural Gas". The American standard NFPA 59A:2009 was revised by redrawing method, and its contents are basically consistent with GB/T 20368 and NFPA 59A.
American standard NFPA59A and EU standard EN 1473 have the same main objects and research contents, but the biggest difference lies in the different ways and methods of determining safety objectives and measures.
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