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Question
The percentage of carbon in grey iron castings usually varies between
Options:
A .  0.5 to 1%
B .  1.2%
C .  2.5 to 4.5%
D .  5 to 7%
Answer: Option C
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.

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