Ultrafine-grained (UFG) state with a mean grain size of 180 nm was produced in a 6060 alloy of the Al-Mg-Si system by high pressure torsion (HPT). The UFG Al 6060 alloy demonstrated high strength: microhardness of 120 Hv and ultimate tensile stress of 525 MPa at room temperature. The tensile tests were carried out at temperatures 120, 150 and 180 °C with the strain rate 10⁻², 5 × 10⁻³, 10⁻³, 5 × 10⁻⁴ and 10⁻⁴ s⁻¹ to determine the best conditions for the manifestation ductility and study of changes in strength of the study material. It established, that the UFG alloy retains an increased 80% of level of strength at room temperature after deformation at elevated temperatures in the temperature range 120–150 °C. The results obtained are compared with changes of the microstructure and strength of the UFG alloy after annealing under similar temperature–time conditions.