If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called

Tempering

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Hardening

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Softening

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Annealing

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Solution

The correct option is C Annealing
If steel is heated to a temperature well below red heat and is then cooled slowly, the process is called annealing. This softens the metal which means it can be cut and shaped more easily. Mild steel is heated to a red heat and allowed to cool slowly.

Suggest Corrections

(p) Nitriding	(I) Process of heating steel to redness and then cooling it very slowly
(Q)Annealing	(II) Process of heating steel in presence of $N H_{3}$ and producing hard coating of Iron Oxide on the surface of steel
(R) Tempering	(II) Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil.
(S) Quenching	(IV) Process of heating quenched steel to a temperature well below redness and then cooling it slowly