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[en] Uniaxial creep strength of the martensitic steel T91 in static LBE at ≤10−7 mass% dissolved oxygen and air at 450–550 °C has been studied. To study an effect of loading, corrosion tests were carried out in LBE at co ≥ 10−7 mass% additionally. Experiments in LBE at 450 °C show that time-to-rupture of T91 is longer than 23,711 h at 390 MPa and co = 10−7 mass% and not shorter than 8900 h at the same load and significantly lower oxygen content. Thin protective oxide film forms on T91 in LBE in the co-range between 5.0 × 10−10 and 1.9 × 10−13 mass% at 500 °C while increasing of the test temperature up to 550 °C resulted in simultaneous solution-based corrosion attack and an internal oxidation on surface in the crept T91 in the co-range between 1.0 × 10−8 and 7.1 × 10−11 mass%. The results of post-test evaluations are presented and discussed with a link to the in-situ measured oxygen concentration.