The process of heating and suddenly cooling of steel is known as :

Tempering

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Annealing

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Hardening

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Quenching

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Solution

The correct option is D Quenching
The process of heating and suddenly cooling of steel is known as quenching.
Quenching or hardening is a process of heating steel to redness followed by sudden cooling by plunging the red hot steel into water or oil.

Hence, the correct option is (D)

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Similar questions

(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

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