Turbine ductile iron castings

Turbine ductile iron castings

constituent

Cast iron is an iron-carbon alloy with carbon content greater than 2.11%. It is obtained by industrial pig iron, scrap steel and other steel and alloy materials through high-temperature melting and casting. In addition to Fe, it also contains carbon in other cast iron in the form of graphite precipitation. If the cast iron is called gray cast iron or gray cast iron when the precipitated graphite is sheet-like, the cast iron is called vermicular cast iron, the cast iron is white cast iron or code iron when it is flocculent, and the cast iron is called ductile cast iron when it is spherical.

In addition to iron, the chemical composition of ductile iron is usually: carbon content 3.0 ~ 4.0%, silicon content 1.8 ~ 3.2%, the total amount of manganese, phosphorus, sulfur does not exceed 3.0% and an appropriate amount of rare earth, magnesium and other nodular elements.