STEP MODEL OF EROSION OF ELECTRODES. III. ADAPTATION TO ARBITRARY REGIMES OF ELECTROEROSION TREATMENTL. I. Sharakhovskii,a A. Marotta,b and A. M. Esipchuka UDC 621.387.143.014.31 The step model of erosion of the cold electrodes of electric-arc heaters proposed in Inzh.-Fiz. Zh., 76, No. 2, 36-42 (2003) and Ann. N.Y. Acad. Sci., 891, 36-42 (1999) has been modified for calculating the rate of electroerosion treatment of materials. The point heat source [J. Appl. Phys., 66, No. 9, 4095-4103 (1989)] for determining the effective enthalpy of erosion has been reduced to a plane surface heat source equivalent in erosion and corresponding to the step model. The approximation analytical relations in dimensionless numbers have been obtained. The calculation results are in satisfactory agreement with the experimental data of different authors. aA. V. Luikov Heat and Mass Transfer Institute, National Academy of Sciences of Belarus, Minsk, Belarus; email: email@example.com; bGleb Wataghin Institute of Physics at Campinas State University, Campinas, Brazil (Instituto de Fisica "Gleb Wataghin," Universidade Estadual de Campinas, Campinas, Sã Paulo, Brasil); email: firstname.lastname@example.org. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 2, pp. 127-133, March-April, 2003. Original article submitted October 14, 2002.