Engineering Materials
Machining properties of steel are improved by adding

Vanadium, aluminium
Silicon, aluminium, titanium
Chromium, nickel
Sulphur, lead, phosphorous

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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
Reducing the ore with carbon in the presence of a flux
All of these
Removing the impurities like clay, sand etc. from the iron ore by washing with water

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