Demand for alloys with high mechanical performance and optimum qualities in the service conditions require new studies regarding thermal stability, wear resistance and corrosion resistance to them. Of interest are materials in which the deficient and expensive Ni is partially or completely substituted with Mn, such as the alloys of the systems Fe-Cr-Mn-C or Fe-Cr-Mn-Ni. To build an accurate picture of the structural features, properties and their behavior in the operating conditions need to be carried out relevant studies. The objectives of the study are related to clarify the processes of structure formation in heating and cooling of this type of austenitic alloys. Object models are cast with an increased concentration of carbon and constant chromium and manganese in the starting composition, as well as those supplemented with vanadium and nickel.