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.