ASTM A517 Grade B in the standard A517/A517M is a kind of high tensile alloy steel plates material used to fabric hightemperature pressure vessels. ASTM A517 have six grades or levels. They are : Grade A, grade B, grade E, grade F, grade J , grade P. ASTM A517 Grade B need to be done the (Quenching + Tempering ) heat-treatment to meet the property requirement in the standard ASTM A517.

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ASTM A517 Grade B application :
With high strength, good plasticity, toughness and welding performance, mechanical module supports used in nuclear power plants.