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Which of the following is NOT a case hardening process?
1. Normalizing
2. Annealing
3. Cyaniding
4. Both Normalizing and Annealing

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Correct Answer - Option 4 : Both Normalizing and Annealing

Concept:

  • Case hardening is a method used to harden the outer surface of low-carbon steel while leaving the center or core soft and ductile.
  • Case hardening involves heating the metal to its critical temperature in some carbonaceous material.
  • The following methods are commonly used:
    • Carburizing
    • Cyaniding
    • Nitriding
    • Induction Hardening
    • Flame hardening

Heat treatment is an operation involving heating and cooling of a metal or alloy so as to obtain certain desirable properties. A few important heat treatment processes are:

  • Annealing
  • Normalizing
  • Hardening
  • Tempering

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