Scientific paper ID 25 : 2003/2

Present report is a part of series investigations on the fatigue failure of surface hardened steels. The hardness of the surface is uneven, caused by heat treatment - annealing, induction hardening, nitriding carburizing. Its designation is to analyze the results of the manners of the specimens from steel 40X under changeability loads. These results will be used for find out the parameters of the distribution function of the fatigue life of the real details, which work condition is variability.