Engineering Materials
Free carbon in iron makes the metal

Hard and gives a fine grained crystalline structure
Soft and gives a fine grained crystalline structure
Hard and gives a coarse grained crystalline structure
Soft and gives a coarse grained crystalline structure

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Engineering Materials
Carbon steel is

Extensively used for making cutting tools
Made by adding carbon in steel
Refined from cast iron
An alloy of iron and carbon with varying quantities of phosphorus and sulphur

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