What is hardening and quenching of steel? Explain.

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Solution

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

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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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