In this study, Taguchi method is used to find out the effect of micro alloying elements like vanadium, niobium and titanium on the

hardness and tensile strength of the normalized cast steel. Based on this method, plan of experiments were made by using orthogonal

arrays to acquire the data on hardness and tensile strength. The signal to noise ratio and analysis of variance (ANOVA) are used to

investigate the effect of these micro alloying elements on these two mechanical properties of the micro alloyed normalized cast steel. The

results indicated that in the micro alloyed normalized cast steel both these properties increases when compared to non-micro-alloyed

normalized cast steel. The effect of niobium addition was found to be significantly higher to obtain higher hardness and tensile strength

when compared to other micro alloying elements. The maximum hardness of 200HV and the maximum tensile strength of 780 N/mm2

were obtained in 0.05%Nb addition micro alloyed normalized cast steel. Micro-alloyed with niobium normalized cast steel have the finest

and uniform microstructure and fine pearlite colonies distributed uniformly in the ferrite. The optimum condition to obtain higher hardness

and tensile strength were determined. The results were verified with experiments.