Engineering Materials
Carbon steel is

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

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Engineering Materials
Tungsten in steel

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

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