A612 steel plate is the standard specification for pressure vessel plates that are high strength, carbon steel for moderate and lower temperature use. The maximum thickness for plates supplied under this specification is 1 in. [25mm].
ASTM A612. ASTM A612 specification is the Standard Specification for Pressure Vessel Plates, Carbon Steel, High Strength, for Moderate and Lower Temperature Service. ASTM A612 encompasses carbon-manganese-silicon steel plates intended for use in welded pressure vessels for moderate and low temperature service.