Abstract
The low activation martensitic chromium steels OPTIFER Ia, Ib, II, III and IV and F82H mod. were subjected to aging by annealing between 550°C and 650°C for up to 10,000 h. In general, this caused a decrease in tensile strength by up to 10%. The decrease in total elongation depended on the thermal treatment of the material. Impact bending strength was hardly affected by aging. With one exception, all tested steels turned out to be sufficiently resistant to aging.
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