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Match Column $-I$ with Column $-II$
| Column $-I$ | Column $-II$ |
| $(P)$ Nitriding | $(I)$ Process of heating steel to redness and then cooling It very slowly |
| $(Q)$ Annealing | $(II)$ Process of heating steel in presence of $NH_3$ and producing hard coating of Iron Nitride on the surface of steel |
| $(R)$ Tempering | $(III)$ 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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