Ductile iron, also known as nodular cast iron or spheroidal graphite iron, is a type of cast iron characterized by its spherical graphite microstructure. This structure gives ductile iron unique properties such as high tensile strength, excellent elongation, and superior impact resistance compared to traditional gray iron.Ductile iron is widely used in industries that require components combining durability with cost efficiency — such as automotive, construction, water supply, and heavy machinery.