Engineering Materials
A small percentage of boron is added to steel in order to

Increase hardenability
Reduce machinability
Increase endurance strength
Increase wear resistance

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Engineering Materials
Cobalt in steel

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

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