The deformation and damage of a high chromium steels in a wide temperature range was studied by numerical simulation method. A model was proposed to predict the deformation and damage of high chromium steels at a quasi-static loading within the temperature range from 295 K to 1100 K. The model takes into consideration mechanisms of hardening and softening high chromium steels in a wide temperature range. It is shown that the ductility of high-chromium steels increases proportional to temperature in the range from 750 K to 1100 K in connection with the growth of precipitates of alpha-phase.