Question

The Cast Iron which possesses all the carbon in the combined form as cementite is known as

• A. Grey Cast Iron
• B. Spheroidal Cast Iron
• C. Malleable Cast Iron
• D. White Cast Iron

Hint:

White cast iron has all its carbon in the form of cementite (Fe₃C), making it hard and brittle.

Answer 1

The Correct Option is D

The iron that contains all its carbon in the form of cementite (Fe₃C) is known as White Cast Iron. This type of cast iron has very little free graphite, and the carbon is mainly present as cementite.

- Grey Cast Iron contains free graphite, which gives it a grey color when fractured.
- Spheroidal Cast Iron has graphite in spherical form, providing higher strength and ductility compared to grey cast iron.
- Malleable Cast Iron is created by heat-treating white cast iron to convert the cementite into graphite.

Thus, the correct answer is White Cast Iron.
Final Answer: (D)