1. A substantial phase transformation occurs in the surface layer of St. 3 steel samples as the results of electropulse treatment. As a consequence of the interaction of the medium with the graphite electrode and the high temperature carbon atoms penetrate the crystal lattice of α-iron, resulting in the formation of tetragonal martensite and austenite, and also cementite. The amount of austenite reaches 37–40%. The amount of carbon in martensite exceeds 1%. 2. Electropulse treatment of the KhN70VMYuT alloy induces substantial coarsening of the blocks. The depth of the layer of coarse blocks is a linear function of the severity of the treatment conditions. No phase transformations occur in this alloy as the result of the electropulse treatment.