Melt the black metal

Release time:

Jan 03,2025

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Melt the black metal

Induction heating is a simple method for heating a batch of metal to a specified temperature. It can replace large furnaces with long start-up and shutdown times and low efficiency. In contrast, induction heating devices are small, quick to start, clean and efficient. The energy of the induction heating furnace can go directly into the workpiece, and the heating time can often be as short as a few minutes (except when heating large objects), and this heating process is well suited to automated production methods. 

Although the cost of electricity per unit of energy is high, it can be compensated by high heating efficiency. In the first chapter, it was discussed that induction heating occurs within a certain surface depth (heating from room temperature at a frequency of 50 Hz, the heating depth of steel is 2 mm; copper is 10 mm). The heat needs to be transferred to the rest of the bar or slab by heat conduction. Non-ferrous metals have a high thermal conductivity coefficient, so the problem of heat transfer to the rest is not large, but for steel and other metals with low thermal conductivity coefficients, we must avoid overheating or even melting of the surface. Heat flow is an important aspect of penetration heating Melt the black metal.


Since we do not seek to limit the heating layer to the surface (e.g. for quenching), we can use lower frequencies for heating. Thus, non-changing frequency industrial frequency (50/60 Hz) induction heating is obviously worthy of attention, and medium frequency induction heating (1-10 kHz) is also widely used. Penetration heating can be used for forging, forming, annealing and induction melting. It can also be used for extrusion heating of aluminum and other non-ferrous metals. These heating applications are powerful, and since the furnace production rate is as high as several tons per hour, the power supply must be quite large (although hundreds of kilowatts are not uncommon, and most commonly used are hundreds of kilowatts).

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