Enameled cookware may be fabricated from either mild steel, cast iron or aluminum.
The required enameling process & equipment varies per substrate.
Pretreatment for mild steel cookware is usually a pickling process, while cast iron is shotblasted.
Aluminium cookware is fired at a lower temperature in a convection oven, while cast iron & mild steel are fired in a radiation furnace.
Cast iron & mild steel can’t be fired simultinuously in the same furnace due to different temperature profiles.