Engineering Materials
Steel contains

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

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Engineering Materials
Smelting is the process of

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
Reducing the ore with carbon in the presence of a flux

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