Define Annealing,Quenching ,Tempering,Nitriding & Case-hardening



Annealing:

It is the process of heating steel to redness followed by slow cooling.

Quenching or Hardening:

It is the process of heating steel to redness followed by sudden cooling and plunging the red hot steel into water or oil.

Tempering:

It is the process of heating the hardened or quenched steel to a temperature much below redness (350 °C) followed by slow cooling.

Case -hardening:

It is a process of giving a thin coating of hardened steel to wrought iron or to a strong, flexible, and mild steel by heating it in contact with charcoal followed by quenching in oil.

Nitriding:

It is a process of heating steel at 700 °C in an atmosphere of ammonia. This process impart a hard coating of iron nitride on the surface of steel.

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