Effect of density, electric conductivity, viscosity of a liquid-metal bath on quantitative and qualitative peculiarities of the melt hydrodynamic flow with a rectangular cross-section has been studied. Alloying components effect on liquid metal flow rate has been considered. It has been shown, that chromium, manganese, and silicon additions up to 5 at.% do not practically change iron flow rate in the lower bath layer. The similar dependence for nickel has maximum at its concentration of 10 at.%. Aluminium additions essentially increase this parameter. Variations in the flow quantitative characteristics are recommended to be taken into account, when preparing melts under individual process conditions.