The percentage of carbon in grey iron castings usually varies between

A. 0.5 to 1%

B. 1.2%

C. 2.5 to 4.5%

D. 5 to 7%

Answer: Option C

Solution(By Examveda Team)

Most cast irons have a chemical composition of 2.5 - 4.0% carbon, 1 - 3% silicon, and the remainder iron.
Grey cast iron has less tensile strength and shock resistance than steel, but its compressive strength is comparable to low- and medium-carbon steel.