Question : Which one of the following is the purest commercial form of iron?
Option 1: Pig iron
Option 2: Steel
Option 3: Stainless steel
Option 4: Wrought iron
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Correct Answer: Wrought iron
Solution : The correct option is Wrought iron .
Its carbon percentage is 0.12 - 0.25%. Impurities (Mn, Si, P) are present in low amounts. On melting of cast iron with scrap iron in a reverberatory furnace, wrought iron is formed. It is relatively soft, malleable and fatigue-resistant. The mechanical properties and corrosion resistance are also good in wrought iron.
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