Steels and other ferrous alloys are very well known as construction materials in many fields but still are widely used and in the near future this will not change [1-4]. Among the steel and cast steel resistant to corrosion most modern and dynamically developing group are ferritic-austenitic alloys, commonly known as duplex. Higher than austenitic steels, mechanical properties and good corrosion resistance in both overall and pitting make duplex steels irreplaceable material in the petrochemical industry, power, pulp and paper, food. Duplex steels and cast steels characterized by multiphase microstructure have a complex plasticity due the fact of deforming two different phase austenite and ferrite. The chemical composition of a steel containing about 0.02% C, 26% Cr, 6.5% Ni, 3% Mo, 1.4% Mn, 0.2% N guarantees that already, in the raw state, immediately after casting is obtained ferritic - austenitic structure. Because due to the fact that a substantial part of the problems associated with the production of duplex steels appears in the as cast state this state was taken as initial condition for the deformation process. In the paper  were presented discussed problems of the discussed steel plasticity. As the microstructure of the final product is affected, by three last deformation  in this paper are presented results different variant of deformation including three equal deformation 20%. In this article are presented results of microstructure changes and physical simulation of the rolling process carried out with the simulator Gleeble 3800.Keywords: duplex steel, innovative materials, plastic deformation, physical modeling, microstructure
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