Low carbon steel of composition 0.98wt was subjected to heat treatment at different holding times, to effect a change in the microstructure of Dual Phase (DP) steel. The samples were quenched in water and the results obtained were analyzed. The influence of operating parameters on the mechanical properties of DP steels was investigated, using response surface methodology (RSM) to develop a prediction model. In developing the model, temperature and holding time were considered as the model variables. The optimum operating parameters were predicted using the user-defined design (UDD) under RSM and the result was validated through experiments. The resulting dispersion of mainly ferrite and martensite largely varied with the holding time for the given composition, cooling rate, and annealing temperature, which was observed under the optical microscope. Improved mechanical properties with increased holding time were observed and this can be attributed to the changes in the microstructure. The longer the holding time, the more changes are witnessed in the microstructure and consequently improved mechanical propriety was observed. At a holding time of 30 minutes, DP steel quenched in water compared with the-received sample shows a Hardness value of 153.43 HV as against 89.45 HV, Ultimate tensile strength of 543.77 MPa as against 317.02 MPa, and Yield strength of 275.60 MPa as against 160.687 MPa. These findings show that at a longer holding time (50 – 60 min), it can be exploited for the production of Dual Phases steel. Keywords— Microstructure, Dual Phases Steel, Mechanical Properties, Low carbon steel