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There are several types of cast iron according to the microstructure of the alloy. Those types are as follows;

Grey cast iron

Ductile cast iron

Malleable cast iron

White cast iron

We use cast iron usually for engineering and construction structures because of its stability. Therefore, it is useful in pipes, machines and automotive industry parts, such as cylinder heads (declining usage), cylinder blocks and gearbox cases. Moreover, it is resistant to destruction via oxidation.

The key difference between ductile iron and cast iron is that we use ductile iron for water pipes due to its durability while we use cast iron usually for engineering and construction structures because of its stability.

Ductile iron and cast iron are useful in the metal industry on an everyday basis. However, the two alloys have different characteristics that result in them being important for various purposes. Both these are alloys of iron. An alloy is a mixture of two or more metals that gives improved properties for different uses.

Summary – Ductile Iron vs Cast Iron

Ductile iron is a form of cast iron having improved properties. The difference between ductile iron and cast iron is that we use ductile iron for water pipes due to its durability while we use cast iron usually for engineering and construction structures because of its stability.