ASTM A240 focused on stainless steel plate, sheet, and strip. ASTM A480 focus on flat-rolled products. ASTM A240 has more processing requirements, stricter tolerances, and a broader thickness and width range compared to the ASTM A480.
ASTM A240 and A480 Chemical Composition
One of the key differences between these ASTM A240 and A480 standards is the chemical composition. ASTM A240 defines chromium, molybdenum, nickel, manganese, silicon, copper, titanium, vanadium, and nitrogen limits for stainless steel plate, sheet, and strip products. On the other hand, ASTM A480 defines chromium, cobalt, molybdenum, nickel, and chromium-nickel limits for flat-rolled stainless and heat-resisting steel products.
ASTM A240 and A480 Categories Covered
ASTM A240 Stainless Steel Plate Sheet: Primarily focused on stainless steel plate, sheet, and strip for pressure vessels and general applications.
ASTM A480 Plate: Encompasses a broader range, including plate, sheet, and strip made from stainless and heat-resisting steel, with a focus on flat-rolled products.
ASTM A240 and A480 Thickness Tolerances
Another difference between these ASTM A240 and A480 standards is the thickness tolerances. ASTM A240 has stricter tolerances than ASTM A480 when it comes to thickness. For example, the thickness tolerance for ASTM A240 Type 304L Plate is ±0.024″ while the tolerance for ASTM A480 Type 304L Plate is ±0.030″. This means the former can be up to 0.006″ thinner.
ASTM A480 and A240 Flatness Tolerances
The flatness tolerances are also different between these SA480 and SA240 standards. The flatness tolerance for ASTM A240 Type 304L Plate is ±0.010″ while the tolerance for ASTM A480 Type 304L Plate is ±0.005″. This means the former can be up to 0.005″ thicker than the latter.
Heat Treatment Requirements
Finally, there are also differences in the heat treatment requirements between these two standards-for example, Annealed material of ASTM A240.
