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Carbon content range for cast irons Select the correct typical carbon range that defines cast iron (as opposed to steel). Choose the correct option.

Difficulty: Easy

0.1 to 0.5% C
0.5 to 1.0% C
1.0 to 1.7% C
1.7 to 4.5% C

Correct Answer: 1.7 to 4.5% C

Explanation:

ConceptCast iron is generally defined for carbon contents from about 2% up to roughly 4.3–4.5%. Many curricula round the lower bound to 1.7% (the eutectoid limit of steel) to distinguish it clearly from steels.

Final Answer1.7 to 4.5% C

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