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　　 Medium-frequency furnace It is a power device that converts the 50 Hz AC power frequency into a medium frequency (ranging from 300 Hz to 1,000 Hz). After rectification, the three-phase AC power at industrial frequency is converted into DC power, which is then transformed into an adjustable medium-frequency current. This medium-frequency AC current flows through capacitors and induction coils, generating high-density magnetic flux lines within the induction coil. As these magnetic flux lines cut across the metal material contained in the induction coil, they induce large eddy currents in the metal.

　　This eddy current also exhibits some of the characteristics of medium-frequency currents. In other words, if free electrons within the metal itself flow through a metallic body that offers resistance, heat will be generated. A three-phase bridge fully controlled rectifier circuit is used to convert alternating current into direct current. For example, if a metal cylinder is placed inside a conductive coil carrying medium-frequency alternating current, the metal cylinder will not come into direct contact with the induction coil, and the temperature of the electrical coil itself will remain relatively low. However, the surface of the cylinder will heat up to a red-hot state, and the intensity of this reddish glow and the rate of melting can be precisely controlled by adjusting the frequency and the strength of the current. If the cylinder is positioned at the center of the coil, the temperature around the cylinder will be uniform; even as the cylinder heats up and melts, no harmful gases or intense light pollution will be produced.

　　The medium-frequency furnace is primarily used for smelting non-ferrous metals, including ferrous materials such as steel, alloy steel, special steel, and cast iron, as well as non-ferrous metals like stainless steel and zinc. It can also be used for the smelting of non-ferrous metals such as copper and aluminum, as well as for temperature increase, heat preservation, and dual-operation in blast furnaces.

　　Online heating for forging heating bars, round steel, square steel, and steel plates—including through-heating, heat preservation, and quenching—plus online heating for blanking, partial heating, and in-line forging, extrusion, and hot rolling of metal materials. We also provide surface heat treatment for various mechanical components (such as automotive and motorcycle parts), as well as full-scale heat treatments including quenching, annealing, and tempering of entire metal materials.

　　Features of medium-frequency furnaces: fast heating speed, high production efficiency, minimal oxidation and decarburization, material and cost savings, and extended die life. Medium-frequency furnace

　　Since the principle of medium-frequency induction heating is electromagnetic induction, the heat is generated internally within the workpiece itself; ordinary workers can use it. Medium-frequency furnace Ten minutes after starting work, you can immediately begin continuous forging operations without requiring specialized furnace operators to preheat or seal the furnace. Thanks to its rapid heating rate, this heating method produces minimal oxidation—oxidation loss in medium-frequency heated forgings is only 0.5%, whereas oxidation loss in gas-fired furnaces reaches 2%, and in coal-fired furnaces it can go as high as 3%. The medium-frequency heating process saves materials: for every ton of forged parts, it reduces steel material consumption by at least 20–50 kilograms compared to coal-fired furnaces. Moreover, its material utilization rate can reach up to 95%. Because this heating method ensures uniform heating with a minimal temperature difference between the core and surface, it significantly extends the service life of forging dies and reduces the surface roughness of forged parts to below 50 μm. In terms of energy savings, medium-frequency heating is 31.5% to 54.3% more efficient than heavy oil heating and 5% to 40% more efficient than gas heating. The heating quality is superior, reducing the defect rate by 1.5% and increasing production efficiency by 10% to 30%, while also extending die life by 10% to 15%.