The chemical composition of the tested shaft flange material corresponds to the requirements of the GOST 977-88 standard
[6]. The fact that some of the obtained elongation values were lower than the minimal required, shows that there are
locations in the microstructure that have reduced ability for plastic deformation. So, in these locations easier occurrence of
initial cracks can be expected.
The established tensile properties, specifically tensile strength and elongation values, are lower than required ones, i.e.
the tested steel casting sample does not fully meet the tensile characteristics requirements stated in the GOST 977-88 standard
[6]. From the point of view of toughness, the presented and analyzed results of testing the notch impact strength shows
that the material meet the requirements of the reference standard [6].
The results of micro-structural analysis in light microscope show that the microstructure was cast fine grained, ferritepearlite
microstructure with non-metallic oxide-type inclusions and with sporadic dendrite-structure participation. The
presence of microcracks is also noticed.