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A method is proposed to predict the fatigue life under survice coditions subjected to temperature, corrosion and stress variations simultaneously using the results which were obtained from tests under stress variation, stress and temperature variations, or stress and corrosion variations. In this method the fatigue life L is calculated by following equation; L=L_0/Σ (1/ηTij・1/ηPHi・D_<ij>) where ηPHi and ηTij are the coefficients in relation to the variations of corrosion and temperature respectively and D_<ij> is the fatigue cumulative damage. The value of ηPHi range between 0.16 and 0.64 for 13%Cr-Mo steel tested under stress and corrosion variations. The value of ηTij range between 0.20 and 116 for Cr-Mo cast steel tested under stress and temperature variations.
