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The article includes the analysis of the results of fatigue testing of austenitic steel X2CrNiMo17-12-2 in as-delivered condition and after annealing. The steel selected was identified in terms of monotonic properties, the chemical composition and the microstructure. The samples for testing were exposed to fully reversed loads, sinusoidally variable: tension-compression, torsion, proportional load produced by tension-compression and torsion at various ratios of amplitudes as well as non-proportional complex load produced by tension-compression and torsion of various ratios of amplitudes and the phase shift angle φ=90. The paper covers a detailed analysis of the correlation between: fatigue life values and loading, fractography of fatigue fractures and loading, strains, stresses parameters and thermographic analysis results.