The staircase test block with 20, 45 and 75mm wall thickness were performed on low alloyed Mn-Ni cast steels microalloyed by V or V + Nb additions. Precipitations of carbo -nitrides in these alloys are related to the different cooling rate and segregation during solidification process.
The effects of V + Nb nanoparticles and heat treatments increased yield strength up to 850-950 MPa at the elongation above 8-10 %. Particle size changes from 10 to 60nm and depends on the cooling rates (0,15 - 0,9 0C) and the process of microalloying. Carbo - nitrides are distributed mainly in one phase of mikrostructrue.

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