Correct Answer - Option 4 : Cast iron
Cast iron contains about 2 to 3.75% carbon and small percentages of silicon, sulfur, phosphorous, and manganese.
Properties of Cast iron
- Cast iron is a hard and brittle material
- It has high compressive strength and low tensile strength
- It is neither malleable nor ductile
- It has excellent vibration damping capacity and wears resistance
- Graphite is present in cast iron in free form and it adds self-lubricating properties to cast iron
- The corrosion resistance of cast iron is improved via the addition of minor elements such as silicon, nickel, chromium, molybdenum, and copper.
So, because of its high compressive strength and excellent vibration damping capacity, the machine beds are manufactured of Cast iron.