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ASTM A537 carbon steel pressure vessel plates are widely used in the construction of liquefied petroleum gas (LPG) storage tanks. The plates can be furnished in three classes (Class 1, Class 2, Class 3) according to different heat treatment conditions and minimum yield strength requirements. The main constituents of LPG are propane and butane, which are usually stored at the design temperature as low as -45°C. The LPG tanks can be furnished in spherical or cylindrical shape.