The critical temperatures were set on based on dilatometric methods (Ac1s = 690°C, Ac1f = 760°C and Ac3 = 850°C), and normalizing process was designed. On figure 1 the as-cast condition microstructures of the examined cast steel in a raw condition (after casting) are shown. Cooling of cast during its solidification to the room temperature allowed to reach the microstructure of bainite (fig. 1). Cooling after normalizing from the area of homogeneous austenite (930°C) to the room temperature brought about its hardening to bainite once again (fig. 2). As a result of diversified intensity of etching in microstructure (fig. 2a) the segregation places formed during crystallization are visible. In comparison with the as-cast condition (fig. 1) the microstructure was refined and easily etching net is appears mostly along the prior boundaries of grains of former austenite. The appearance of easily etching places is caused by increased cooling rate after normalizing in comparison to slowly cooled massive cast. Fast cooling of the areas along the original boundaries of austenite, enriched in carbon and elements of alloy, do not allow to precipitation of carbides. In these areas the temperature MS is decreased, what leads to higher amount of retained austenite in them after cooling (fig. 2). The slow cooling results in precipitation of carbides from super saturated bainitic ferrite, taking off carbon from the areas of segregation after the original boundaries of austenite (fig. 1).