Engineering Materials
Smelting is the process of

Reducing the ore with carbon in the presence of a flux
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
All of these
Removing the impurities like clay, sand etc. from the iron ore by washing with water

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

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