Engineering Materials
Steel contains

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

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Engineering Materials
Cobalt in steel

Gives ductility, toughness, tensile strength and anti corrosion property
Refines grain size and produces less tendency to carburisation, improve corrosion and heat resistant proper ties
Improves wear resistance, cutting ability and toughness
Improves cutting ability and reduce hardenability

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