Features of Induction Furnace Melting
1) Electromagnetic induction heating. Due to different heating methods, the induction furnace does not have the graphite electrode necessary for arc heating, nor does it have the local overheating zone under the arc, thus eliminating the possibility of electrode carburization. Induction furnace can smelt steel and alloy with extremely low carbon content, which are difficult to smelt in electric arc furnace, creating favorable conditions for obtaining products with low gas content.
(2) There is a certain intensity of electromagnetic stirring in the molten pool. The metal stirring caused by electromagnetic induction promotes the composition and temperature to be uniform, and the inclusions in the steel merge, grow up and float up. In the process of induction furnace melting, the burning loss of alloy elements is less, so the predicted composition is more accurate, which is conducive to composition control and shortening melting time.
(3) The specific surface area of molten pool is small. This is beneficial to reduce the loss of easily oxidized elements in the metal molten pool and reduce air intake, so induction furnace creates better conditions for smelting high alloy steels and alloys, especially varieties containing titanium, aluminum or boron and other elements. However, it is easy to form "cold slag" with poor fluidity and low reactivity, which is not conducive to the metallurgical reaction at the slag-steel interface. Therefore, induction furnace smelting has strict requirements on raw materials.
(4) Input power adjustment is convenient. In the process of induction furnace melting, the input power can be conveniently adjusted. Therefore, the temperature of the molten pool can be controlled more accurately, the heat preservation in the furnace can be carried out, and the steel can be tapped several times, thus creating conditions for smelting several products with different compositions in one furnace.
(5) The same power supply can supply power to several furnace seats with different capacities (but not at the same time), so the flexibility of induction furnace is greater than that of electric arc furnace in terms of smelting capacity.
(6) High thermal efficiency. The heating mode, specific surface area and heat dissipation of induction furnace are small, so the thermal efficiency of induction furnace is higher than that of electric arc furnace. However, the electric efficiency of induction furnace is lower than that of electric arc furnace, so the total efficiency of the two electric furnaces is similar.
(7) Less smoke and dust and less pollution to the environment. When melting in induction furnace, there is basically no flame and no combustion products.
(8) Refractory consumption is higher than that of electric arc furnace and crucible life is shorter. The requirements for crucible refractory materials are high, so the cost of refractory materials per ton of steel is higher than that of electric arc furnace.