Engineering Materials
Free carbon in iron makes the metal

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

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Engineering Materials
Chromium in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves wear resistance, cutting ability and toughness
Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves cutting ability and reduces hardenability

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