Introduction to Composition Analysis of Ductile Iron

Cast iron is an iron carbon alloy with a carbon content greater than 2.11%, obtained by high-temperature melting and casting of industrial pig iron, scrap steel and other steel and alloy materials. In addition to Fe, it also contains carbon in other cast iron that precipitates in the form of graphite. If the precipitated graphite is in the form of strips, the cast iron is called gray cast iron or gray cast iron; if it is in the form of worms, it is called nodular cast iron; if it is in the form of flocs, it is called malleable cast iron or code iron; and if it is in the form of balls, it is called nodular cast iron.

The chemical composition of ductile iron, except for iron, is usually: carbon content of 3.0-4.0%, silicon content of 1.8-3.2%, total manganese, phosphorus, sulfur content not exceeding 3.0%, and appropriate amounts of rare earth, magnesium and other spheroidizing elements.