Selected properties of new "duplex" cast steel

In this paper selected properties of new 'duplex' cast steel are presented. The new cast steel was devised in HYDRO-VACUUM company in Grudziądz, where 'duplex' cast steel for pump elements is smelted. The goal was to devise a new grade of 'duplex' cast steel of better physicochemical properties and cheaper than now applied. It was demonstrated, that there is the possibility of devising the new grade of 'duplex' cast steel. It is characterized by higher mechanical properties, similar wear resistance and greater corrosion resistance in 15% water solution of H2SO4 in comparison to now ap p lied 'duplex' cast steel. The chemical composition was selected to obtain in microstructure about of 50% ferrite and 50% austenite. It guarantee the highest properties and the lowest costs of its smelting. In the paper results of: the microstructure, Rm, Rp0,2, A5, HB, wear resistance and corrosion resistance in water solution of 15% HCl and H2SO4 acids of new cast steel was presented. They were compared with now applied in HYDRO-VACUUM company 'duplex' cast steel.