Both cast iron and cast steel are ferrous materials made mostly of iron and carbon. Cast iron is a ferrous substance that contains more than 2% carbon. Cast steel, on the other hand, contains less than 2% carbon. The fundamental variation in composition is the quantity of carbon in cast iron and steel. Cast iron and cast steel both have excellent casting characteristics and are employed in various applications. Cast iron and cast steel both have excellent mechanical characteristics. This article will look at the fundamental distinctions between cast iron and cast steel.