A dilatometric study of the austenite transformation in steel 0,2C-2Cr-2Mn-Si-Ni-Mo-N was carried out during the various modes of quench-ing-partitioning treatment. The processes occurring during single-stage, two-stage quenching-partitioning and quenching-partitioning-tempering have been studied. It is shown that two-stage QP stabilized up to 14% of retained austenite at room temperature in the structure of the steel under study. The values of mechanical properties (strength, plasticity, impact strength) are determined. It has been established that quenching-partitioning provides higher strength and elongation compared to oil quenching and low-temperature tempering, but lower values of reduction of area and impact strength.