Electrotechnical steels include dynamo and transformer steels, so that to dynamo belong steels with content of silicon from 0.8% to 2.5%, and to transformer - with content of silicon to 4.8%. From the flatness of the electrotechnical sheet steel, and, respectively, the elements stamped from it, the filling factor of the magnetic circuit depends. The rolling force exerts the greatest influence on the elastic deformations of the roller system, and, consequently, on the violation of the uniform distribution of the drawing coefficient over the width of the rolled strip, and, accordingly, its flatness. To study the effect of temperature on the hot rolling force, experimental studies were carried out at the Gleeble-3800 facility. The experiments were carried out with steel with two different silicon (Si) contents: samples A - 0.43%; samples B - 1.12%. The experiments showed that the dependence of the reduction stress on the reduction deformation for samples A is maximal at T = 900 ° C, and at T = 1100 ° C and 850 ° C are minimal and practically identical. The microstructure of sample A, obtained at a deformation temperature of 850 ° C, and sample B, obtained at a deformation temperature of 900 ° C, illustrated the dynamics of the development of phase transformations.