Question

Which of the following is a case hardening process ?
1. Carburizing
2. Nitriding
3. Cynading
4. All of the above

Answer 1

Correct Answer - Option 4 : All of the above

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