Topic: Material Science
The variety of cast iron which has maximum hardness is
- A. Gray iron
- B. Malleable iron
- C. Ductile iron
- D. White iron
Answer: D. White iron
Explanation: White cast iron has maximum hardness among various varieties of cast iron. The white cast iron structure is very hard, wear-resistant and brittle because of the presence of large amount of iron carbide instead of graphite.