Railway Wagon Axles Are Made By Heating Rods Of Iron Embedded In Charcoal Powder. The Process Is Known As

Why Kaysons ?

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Question

Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as

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Solution

Correct option is

The process of hardening the surface of wrought iron by depositing a surface layer of steel on it is called case-hardening. It is done by heating wrought iron in contact with potassium ferrocyanide.

Alternatively, case hardening can also be done by heating wrought iron with charcoal and then plunging it in a suitable oil.