Define cast iron$?$

Hint: Cast iron is an alloy of iron that contains $2$ to $4$ percent carbon, alongside changing measures of silicon and manganese and traces of impurities like sulfur and phosphorus. It is made by diminishing iron mineral in an blast furnace and alloy constituents affect its color when fractured

Complete answer:
Cast iron is a group of iron-carbon alloys with a carbon content more than$2\% $. Its usefulness derives from its relatively low melting temperature. Cast iron is made from pig iron, which is the product of melting iron ore in a blast furnace.
Cast iron can be made directly from the molten pig iron or by re-melting pig iron, often along with substantial quantities of iron, steel, limestone, carbon and taking various steps to remove undesirable contaminants. Phosphorus and sulfur may be burnt out of the molten iron, but this also burns out the carbon, which must be replaced.
Cast iron will in general be weak, aside from malleable cast irons. With its moderately low melting point, great smoothness, castability, incredible machinability, protection from deformation and wear obstruction, cast irons have become a designing material with a wide scope of utilizations and are utilized in lines, machines and auto industry parts, for example, cylinder heads, cylinder squares and gearbox cases. It is impervious to harm by oxidation.

Note:
Cast iron's properties are changed by adding different alloying components, or alloyants. Close to carbon, silicon is the most significant alloyant on the grounds that it powers carbon out of arrangement. A low level of silicon permits carbon to stay in arrangement shaping iron carbide and the creation of white cast iron. A high level of silicon powers carbon out of arrangement, framing graphite and the creation of dark cast iron.