Ductile iron is a high-strength cast iron material widely used in recent years. The overall performance of this material is comparable to that of steel. Because of its excellent performance, it has been successfully used to cast some parts with high force requirements, high strength, toughness and wear resistance. At present, ductile iron has rapidly developed into a cast iron material that is second only to gray cast iron and widely used.
For example, the current "iron-based steel" material, which is often referred to as spheroidal graphite cast iron. The material is obtained by spheroidizing and inoculating to obtain spheroidal graphite, which effectively improves the mechanical properties of the cast iron, in particular, improves the plasticity and toughness, thereby obtaining higher strength than carbon steel.
The so-called cast iron is actually an alloy material. In the process of casting, if the precipitated graphite is in the form of strips, the cast iron is called gray cast iron or gray cast iron, and the cast iron in the form of worms is called vermicular cast iron. When the cast iron is called white cast iron or code iron, and the cast iron is spherical, it is called ductile iron. In ductile iron, in addition to iron, other chemical components are usually: carbon content of 3.0 to 4.0%, silicon content of 1.8 to 3.2%, total manganese, phosphorus and sulfur content of not more than 3.0% and appropriate amount of rare earth, Spheroidal elements such as magnesium.