For the experiments, an induction m

For the experiments, an induction melting unit UPI-0.5-3.0-440 produced by "Reltec", Ekaterinburg, consisting of an induction melting furnace IPP-0.5 and a semiconductor frequency converter PVG-3-440.Technical characteristics of the furnace IPP-0.5: Capacity of the furnace 0,5 kg Power of the feeding converter 3 kW Power of the furnace 2,7 kW Number of phases of the supply network 1 Number of phases of the loop circuit 1 Frequency of the mains current 50 Hz Current frequency of the loop 440 kHz Nominal voltage Power supply 220 V Rated voltage on the inductor 900 V For each steel grade, 10 control and prototypes weighing 0.15 kg were manufactured. Castings after melting were heat treated (normalization at 920oC and tempering). The chemical composition of steels 35 L, 45 L, 20 GFL and 20 GL is given in Table. 1.Mechanical tests were carried out on cylindrical samples, carved from castings, obtained as a result of experimental and control melting. The average values from the results of mechanical tests of control and prototypes are given in the tables for each grade of steel. In all experiments, the torsion beam device (source) was located 1 m from the crucible of the induction furnace. The effect of torsion radiation on the melt was carried out with predetermined components of the line spectrum of the characteristic frequencies prior to the start of casting, and this treatment processed the melt. For example, one of the generators described in [1] or [2] can be used as a source of torsion radiation.