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Fatigue damage accumulation model was developed on basis of present-day linear fracture mechanics development (LFMD), eligible for small and big cracks. It uses relative length of fatigue crack D(l/lc) as a means of material damaging. With the factor use durability objectives (l/lc) allow taking into account the special aspects of fatigue damaging. LFMD using allows detecting features of upbuilding process of fatigue damaging and their quantities, and taking the gage of equipment components resource on basis of the experimental results on trials of the laboratory samples. Fatigue damage accumulation curves in the samples with cross section 50 x 75 mm and from 06H12NZD steel in cast and rolled conditions on stationary loading modes are presented. Appraisal values of their durability for two- and multiunit loadings are also described.