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The heating rods of iron embedded in charcoal powder are used to make railway wagon axles. The process is known as
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Case hardening
Case hardening : 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 a suitable oil.
Alternatively, case hardening can also be done by heating wrought iron with charcoal and then plunging it a suitable oil.
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