Q.

Which one of the following contains maximum percentage of carbon?

A. Cast iron
B. Stainless steel
C. Wrought iron
D. High speed steel
Answer» A. Cast iron
Explanation: Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape, containing 2 to 4.5 percent carbon. Steels contain less than 2% and usually less than 1% carbon, while all cast irons contain more than 2% carbon. Most steel contains less than 0.35 percent carbon. Wrought iron is an iron alloy with very low carbon (0.04 to 0.08%) content.
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