Select the correct option for the given processes. (P) Process of heating stell to redness and then cooling it very slowly. (Q) Process of heating steel in presence of NH_(3) and producing hard coasting of iron nitrate on the surface of steel. (R ) Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil. (S) Process of heating quencheed steel toa temperature well below redness and then cooling it slowly.

Select the correct option for the given processes. (P) Process of hea

1.	Select the correct option for the given processes. (P) Process of heating stell to redness and then cooling it very slowly. (Q) Process of heating steel in presence of NH_(3) and producing hard coasting of iron nitrate on the surface of steel. (R ) Process of heating steel to redness and then cooling it suddenly by plunging it into water or oil. (S) Process of heating quencheed steel toa temperature well below redness and then cooling it slowly.
Answer» TEMPERING , Nitriding, Annealing and Quenching RESPECTIVELY Quenching,Nitriding, Annealing and case HARDENING respectively Tempering , Case hardening ,Quenching Annealing respectively Annealing ,Nitriding,Quenching ,and Quenching Tempering respectively Answer :D