Engineering Materials
Carbon steel is

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

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Engineering Materials
Cobalt in steel

Improves cutting ability and reduce hardenability
Improves wear resistance, cutting ability and toughness
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

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