Abstract: The melting process of the scrap into the low carbon melting pool is difficult to predict, and it is impossible to realize a good control of the continuous charging process in electric arc furnace (EAF). Based on the principles of heat transfer and energy balance, a coupled model of scrap-melt pool-energy was developed. Through verification with experimental data, it was proven that the model could accurately quantify the melting process of single scrap steel and visualize the characteristics of scrap and molten pool under external energy input conditions. The results show that, for spherical scrap, the results of the model are close to the experimental results. For cylindrical scrap with diameters of 50.8, 63.6 and 76.2 mm, it is necessary to multiply the modification parameter for the immersion time in the model results (1.4, 1.3 and 1.2, respectively). On the other hand, higher energy intensity is beneficial to increase the melting speed of the scrap. In the case of insufficient energy input, the increase of melt pool steel volume is favorable for scrap melting, while in the case of sufficient energy input, the increase of melt pool steel volume is unfavorable for scrap melting.

Key words: EAF, scrap, melt, mathematical model