Currently increasingly widespread the application of the induction hardening of ferromagnetic details, due to the high efficiency and universality of this kind of heat treatment. For the most part, the companies which realize this method have limited power capacities and limitations in the frequency range. For these reasons, certain difficulties arise in the induction hardening of cylindrical internal surfaces and achievement of even hardened layer along the detail providing concrete depth. Optimization of the technological regimes can be effectively done using computer models. For this purpose two-dimensional model was developed, simultaneously analyzing the electromagnetic and thermal processes, having taken into account their influence on the properties of the detail and with his help we have optimized the parameters of the inducers