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A542 Grade D Class 2 in the standard A-542/A-542M is a kind of Mo-V alloy steel plates material used to fabric high temperature pressure vessels. A542 have Five grades or levels. They are : grade A, grade B, grade C, grade D, grade E . A542 Grade D Class 2 need to be done the (Quenching + Tempering ) heat-treatment to meet the property requirement in the standard ASTM A-542/A-542M.