[en] Analytical representations were developed for the fatigue life and cyclic stress-strain resonse of AWS A5.14 Class ERNiCr-3 as observed during strain controlled cycling at a strain rate of 4 x 10^-3/s over strain ranges from 0.35 to 3.0% at 25, 343, 538, and 593⁰C. Specific areas studied include fatigue life as a function of strain, cyclic hardening and softening during testing, development of cyclic stress-strain curves from stress-strain amplitude coordinates, and development of bilinear representations of cyclic stress-strain behavior as suggested by current advanced design techniques. At elevated temperatures, the fatigue life of ERNiCr-3 is reduced and the material cyclically hardens. At room temperature, some hardening due to cycling is displayed initially, followed by softening early in the test. The bilinear constants, E/sub m/ and C, are independent of temperature and strain rate, however, K/sub i/ is not. The power law, Δsigma = A(Δepsilon/sub p/)/sup n/, adequately describes the cyclic stress-strain behavior at low strains. By bilinearization, the power law can be extended to predict K/sub i/