The article presents the results of studies on the structure, phase composition, mechanical and corrosion properties of forged-rolled plates made from the structural aluminum alloy of Al-Mg-Cu system in different states. A comparative analysis of the obtained results and the properties of commercial AK4-1 alloy was carried out. It is established that the alloy under study exceeds the analog alloy in terms of the strength properties at room and elevated (up to 175 °С) temperatures on 9-12%. The impact strength of KCU of aluminum alloy of Al-Mg-Cu system is two times greater than that of the AK4-1 alloy. It is shown that the strength and corrosion properties raising after operating heating can be explained by the features of the phase composition and morphology of intermetallic phases including the transition metals phases formed in small quantities in the surface lays of the sample.