Railway wagon axles are made by heating rods of iron embedded in charcoal powerder. The process is known as
A
Case hardening
B
Sherardizing
C
Annelaing
D
Tempering
Text Solution
Verified by Experts
The correct Answer is:
A
Case hardeing: 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 cantact with potassium ferrocyanide. Alternatively, case hardening can also be done by heating wrought iron with charcoal and then plunging it a suitable oil.
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