As a rule the quality of parts made of powder materials is evaluated by the criteria of structural strength, which very often do not reflect their actual operating capacity. This is connected not only with the scale factor, because specimens of rather large size are required for correct determination of crack resistance, but also with the special features of porous steels with a nonuniform concentration. The present paper concerns results of a study of the fatigue and wear resistances of metastable steel -copper pseudoalloys that are copper-infiltrated powder steels.