How Many Types Of Cast Iron Are There
1. White cast iron
Carbon exists in cast iron in the form of cementite except a few dissolved in iron. The fracture is silver white, so it is called white cast iron. At present, white cast iron is mainly used as raw materials for steelmaking to produce malleable iron billets.
All carbon in white cast iron exists in the form of permeating carbon (Fe3c), and the fracture of ball cast iron is bright white. Due to a large number of hard and brittle Fe3c, white cast iron is hard, brittle and difficult to machine.
2. Grey cast iron
All or most of the carbon layer exists in cast iron as sheet graphite, and its fracture is dark gray, so it is called gray iron.
Most or all of the carbon in cast iron exists as free flake graphite. It has good casting performance, good machinability, good wear reduction, good wear resistance, simple melting ingredients, low cost, and is widely used to manufacture castings and wear-resistant parts with complex structures.
3. Ma cast iron
The carbon part is graphite, similar to gray cast iron; Some are free cementite, similar to white cast iron. There are black and white pits in the fracture surface, so it is called hemp cast iron. This kind of cast iron also has a greater hardness and brittleness characteristics, so it is rarely used in industry.