Abstract
Low cycle fatigue and cyclic creep at ambient temperature of UHSLA, the Czech equivalent of the American 300M steel, were studied for different heat treatment (HT). Optimal properties correspond to the annealing temperature of 300 °C that also provides the most favourable complex of other mechanical properties. Cyclic creep threshold curves were proved to exist for this steel, as well. Nevertheless, their relation to the fatigue life drop is significant only for high annealing temperatures. Results show that steel investigated exhibits better mechanical properties than the ROL N steel currently used in the Czech military aircraft and motorcar industry.

Key words
UHSLA, low cycle fatigue, creep, heat treatment

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