How many types of cast iron are used in foundries
Release Time:
10 Jul,2024
1、 According to the different forms of carbon in cast iron, cast iron can be divided into
1. White cast iron
Except for a small amount dissolved in ferrite, the remaining carbon exists in the form of cementite in cast iron, and its fracture surface is silver white, hence it is called white cast iron. At present, white cast iron is mainly used as a raw material for steelmaking and as a blank for producing malleable cast iron.
2. Grey cast iron
Carbon exists entirely or mostly in the form of flake graphite in cast iron, with a dark gray fracture surface, hence it is called gray cast iron.
3. Hemp cast iron
Part of the carbon exists in the form of graphite, similar to gray cast iron; The other part exists in the form of free carbides, similar to white cast iron. The black and white spots on the fracture surface are called ductile iron. This type of cast iron also has significant hardness and brittleness, so it is rarely used in industry.
2、 According to the different forms of graphite in cast iron, cast iron can be divided into
1. Grey cast iron
Graphite exists in the form of flakes in cast iron.
2. Malleable cast iron
Graphite in cast iron exists in a flocculent form. It is obtained by high-temperature and long-term annealing of white cast iron with a certain composition. Its mechanical properties (especially toughness and plasticity) are higher than gray cast iron, so it is commonly referred to as malleable cast iron.
3. Ductile iron
Graphite exists in spherical form in cast iron. It is obtained after spheroidization treatment before pouring molten iron. This type of cast iron not only has higher mechanical properties than gray cast iron and malleable cast iron, but also has a simpler production process than malleable cast iron. Moreover, its mechanical properties can be further improved through heat treatment, so its application in production is becoming increasingly widespread.
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