The percentage of carbon present in cast iron is

Composition of cast iron is 2.5 to 4.5% carbon.

Cast iron is an alloy of iron that contains a significant percentage of carbon, typically ranging from 2.5% to 4.5% by weight. This high carbon content gives cast iron its characteristic hardness and brittleness. The exact percentage can vary depending on the type of cast iron, such as gray iron, white iron, or ductile iron, but it generally falls within this range. The elevated carbon content allows for easy casting into complex shapes, making cast iron an ideal material for a wide range of applications, including pipes, engine blocks, and cookware.