Vyatka State University, Kirov, Russia:

M. Z. Pevzner, Professor, e-mail: mikhailpevzner@yandex.ru

This paper examines the process of continuous induction heating in a transverse magnetic field aimed at producing annealed rolled brass products with the maximum homogeneity of properties. The author used a three-phase line-frequency induction heater, which is a combination of several autonomous induction heaters (or modules). Each module consists of a lower (stationary) and upper halves, with the upper half positioned above the moving strip or band in the annealing section. A variety of the following parameters were applied: the number of induction heaters used and the wiring pattern (delta-wye), the width, thickness and steel grade (L63, L68) of the annealed strip/band, side shift of the lower and upper parts of the modules from the centre line, annealing regime and the cooling rate. The author looked at how to mitigate the impact of the crosswise edge effect on the non-homogeneity of properties across the width of the annealed strip/band. A relationship was established between the distribution of properties and how the width of the annealed strip/band correlates with the width of the induction heater. The author found the optimum ratio which can significantly mitigate the crosswise non-homogeneity of properties. The author tried to shift both the upper and the lower halves of the induction heater to different sides from the strip/band centre line, and thus established how it can be efficient when the ratio between the width of the strip/band and the induction heater width deviates from the optimum. The author demonstrates how such shift should expand the applicability of induction heating and make it more versatile. At the same time, this technique requires further investigation. It was established that rapid transverse magnetic field induction heating (TFIH) combined with the following equalizing heating of the rolled products can also contribute to the homogeneity of final properties. The maximum homogeneity of properties can be reached in a rolled product annealed to the soft state when a TFIH strip is coiled at a high temperature, and the coil is then left to slowly cool down.

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