Methods have been developed for experimentally determining the fatigue limit, which has been called by the authors the minimum cyclic creep limit, and the stess limits at various cyclic stress ratios R, called the cyclic creep limits. During the cyclic creep limit tests, levels of residual stresses are achieved which are equal to the residual stresses obtained at the yield point. It has been shown that with increase in the value of R, the cyclic creep limits increase, and the minimum value of the cyclic creep limit is less than the corresponding yield points of steel 09G2 by about 8 %, and for steel 14Kh2GMR by about 15 %.