Abstract: In the view of the complex heat transfer procedure in the ingot (slag pool)/slag crust/air gap/mold wall/cooling water in an electroslag remelting crystallizer， the heat transfer of the crystallizer was defined 5 modes according to the thermal shrinkage of ingots and slag crust， the distribution of gap and slag， etc. The boundaries of the modes were divided based on the maximum axial temperature gradient. The integral mathematical model of the complex heat transfer procedure of the ingot (slag pool)/slag crust/air gap/mold wall/cooling water interface was established through integrated utilization of these five heat transfer modes. At the same time， the multipoint continuous temperature measuring system was also developed. The measured temperature values were used as the boundary conditions， thus the temperature distribution of the ingot (slag pool)/slag crust/air gap/mold wall/cooling water interface and heat fluxes along the radial direction were solved. The regular pattern of the redial temperature variation in five heat transfer modes of this complex heat transfer system was analyzed by the simulation.

Key words: electroslag remelting (ESR), thermocouple measurement, mold wall, complex heat transfer, heat transfer model