 quenching and partitioning, Q&P, treatments were applied to 0.25 C steel to produce the desired microstructure consisting of a balanced combination of mechanical properties. This was achieved through the simultaneous magnetic transformation and carbon enrichment of retained austenite, RA, during the partitioning stage at 350 degrees Celsius. This resulted in the coexistence of RA islands with irregular shapes embedded in magnetic ferrite and film-like RA in the martensitic matrix. The decomposition of coarse RA islands and the tempering of primary martensite during partitioning was accompanied by a decrease in the dislocation density and the precipitation slash growth of adicarbide in the lathe interiors of primary martensite. The best combinations of a yield strength above 1200 MPa and an impact toughness of approximately 100 J were obtained in the steel samples quenched to 210 to 230 degrees Celsius and subjected to partitioning at 350 degrees Celsius for 100 to 600 seconds. A detailed analysis of the microstructures and the mechanical properties of the steel. This article was authored by Evgeniy Tkachev, Sergey Borsov, Yulia Borsava, and others. We are article.tv, links in the description below.