Case hardening is done on mild steel by _____ process. 

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  1. normalizing 
  2. hardening 
  3. annealing 
  4. nitriding 

Answer (Detailed Solution Below)

Option 4 : nitriding 
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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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