Abstract: Grain size refinement is a unique technique for developing both strength and ductility of steel. In comparison with other techniques of refinement, normalizing is the most economical and suitable process for continuous production. In this work, different chemical compositions of as-forged Ti-V-microalloyed steel alloys were subjected to the normalizing process (just above Ac3) for 30 minutes after varying their microstructure through thermo-mechanical treatments. The obtained microstructures of the normalized steel showed differences due to the initial microstructure variation. The initial martensitic structures produced finer grain sizes in comparison with the initial ferrite-pearlite ones. Moreover, the higher the initial martensitic volume fraction, the higher the efficiency of grain refinement. Finally, a microstructure with a grain size of 2 μm and mechanical properties of 760 YS, 1060 UTS and 19 % elongation was obtained.