Effective Thermal Conductivity of Slag Crust for ESR Slag

摘要

During electroslag remelting process, the shape and dimension of molten steel pool is very important for steel solidification quality. All the time shallow and flat molten steel pool is regarded as an optimal method to obtain high quality electroslag ingot.!’ Many mathematical models have been developed to simulating the electroslag remelting pro- cess.” The purpose of most models is to study how to obtain the optimal solidification condition. A lot of param- eters are essential to deal with the work including power supply, flow rate and temperature of cooling water, geome- try of furnace and so on. In addition, thermal conductivity of slag plays an important role in remelting process. Accu- rate property data of slag is very important for the accuracy of calculation. However, as it is well known, there are a lot of different slags for electroslag metallurgy process. There is solid slag skin surrounding the electroslag ingot and liq- uid slag pool, which acts as an insulator during electroslag remelting process. Because of the lack of thermal conduc- tivity data of fluoride slag, which results in the simulation results separate from the practical situation. To improve the model prediction of thermal field of electroslag remelting process, accurate physical property data are needed. In addi- tion, the energy of 40%-60% has been consumed through solid slag skin by cooling water.” This has a great relation- ship with the thermal conductivity of solid slag, which affects the power consumption of electroslag remelting pro- cess to a certain extent. Few data!?'” of thermal conductiv- ity can be found about fluoride containing slag. Even if the influence of slag component on the thermal conductivity is still not clear. Therefore, data of thermal conductivity of flu- oride slag is very scarce. The investigation of thermal con- ductivity of fluoride slag is very necessary.