The results of bending tests are presented for cracked plane specimens of steel 09G2 under combined loading, i.e., under simultaneous action of static and dynamic stresses at room and low (down to −80°C) temperatures. It has been shown that, at a given temperature, the dynamic component of the critical stress decreases linearly with increase in the static stress. The influence of the static-to-dynamic stress ratio upon critical stresses and the second critical transition temperature has been studied. It is shown that with increase in the coefficient of dynamic capacity which is equal to the critical-to-static stress ratio, the critical stresses decrease and the second critical transition temperature increases. The conclusion has been drawn regarding the necessity of determining the critical stress and the second critical transition temperature of the material under study for the coefficient of the load dynamic capacity of a real structure.