Question

The main difference between cast iron is

• A. Cast iron is purest form of iron while pig iron is impure
• B. Cast iron has lower carbon content (3%) as compared to pig iron (4%) and is extremely hard and brittle
• C. Pig iron contains many impurities like S, P, Si and Mn while cast iron does not contain any impurity and can be casted into any shape.
• D. Cast iron is soft and malleable while pig iron is extremely hard and brittle.

Answer 1

Answer: (B)

Cast iron has lower carbon content (3%) as compared to pig iron (4%) and is extremely hard and brittle

Answer 2

Pig iron contains about 4% C and many other impurities like S, P Si and Mn. Cast iron is made by melting pig iron with scrap iron and coke. It has slightly lower carbon content (3%) and is extremely hard and brittle.