European industry increasingly focusses on recycling, pushing towards circular economy as part of EU Green deal. This offers enormous energy savings and CO2 reductions. However, there are several problems hindering the metals recycling such as the progressive accumulation of tramp impurities in alloys produced from scrap metal. Elements such as antimony cannot be effectively removed during manufacturing of alloys from scrap. Therefore, the next generation of alloys will have be able to tolerate more impurities than current alloys. Such materials also have to be more resistant to fracture, due to the potential damage nucleation at inclusions caused by higher impurity elements concentrations. However, impurities cause significant changes of mechanical properties even in low concentrations and induce considerable complexity even in simple alloy systems. Therefore, the development of the recycling-oriented alloys based on understanding of changes caused by various compositional deviations require a significant volume of research. Concentrated solid solution alloys, including some of the established compositions of austenitic steels have the attributes essential for recycling-oriented alloys. They show enhanced tolerance to compositional deviations due to the extended compositional space with desired microstructures and intrinsically high ductility levels. In this project we aim to analyze the consequences of the intentional contamination with Sb to the changes of microstructures and basic mechanical properties. A highly alloyed austenitic steel AISI 310MoLN (X1CrNiMoN25-22-2) and CoCrNi alloy chosen as a representative concentrated systems.