Engineering Materials
Free carbon in iron makes the metal

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

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Engineering Materials
Steel contains

50% or more iron
80% or more iron
Alloying elements like chromium, tungsten nickel and copper
Elements like phosphorus, sulphur and silicon in varying quantities

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