Cast Iron
The cast iron is obtained by re-melting pig iron and with coke and limestone in a furnace known as a cupola. It is an alloy of iron and carbon. The carbon contents in cast iron differ from 1.7% to 4.5%. Also, it contains a very small amount of silicon, sulfur, manganese, and phosphorus.
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Carbon is present in the following two forms:
1. Free carbon or graphite
2. Combined carbon or cementite
http://www.pfa.org.pk/wp-content/uploads/2017/04/Types-of-cast-iron-1.pdf
