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Medium-Frequency Electric Furnace – Weifang Kanda Electric Furnace Co., Ltd. – Manufacturer of Medium-Frequency Electric Furnaces
Apr 16,2020
In China’s casting industry, medium-frequency induction furnaces equipped with a solid-state power supply featuring a full-bridge parallel inverter using silicon-controlled rectifiers (SCRs) are commonly referred to as “medium-frequency furnaces.” On the other hand, medium-frequency induction furnaces equipped with an IGBT half-bridge series inverter solid-state power supply are typically called “variable-frequency furnaces” (though this term is not entirely accurate; it’s used merely to distinguish them from medium-frequency furnaces equipped with SCR full-bridge parallel inverters). Because these two types of induction furnaces employ different inverter power supplies, their operational performance also differs significantly.
In the casting industry, induction medium-frequency furnaces serve three primary purposes: melting, holding heat, and pouring. Consequently, based on their specific use, they are categorized into melting furnaces, holding furnaces, and pouring furnaces.
Medium-frequency aluminum-shell electric furnace
Crucible induction furnaces are primarily used for melting cast iron and non-ferrous metals. Due to their strong electromagnetic stirring force, the furnace lining has a very short service life when melting steel. As shown in the mid-frequency induction furnace image, such furnaces are therefore not suitable for steelmaking unless the issue of refractory material lifespan can be resolved.
Compared with crucible-type electric furnaces, medium-frequency induction furnaces have several advantages: they offer high power density, facilitate easy melting initiation, and do not require a three-phase balancing device. Under the same production rate conditions, they also feature a smaller furnace size. Moreover, since they can be emptied completely, it is easier to switch between different metal types.
For the complete annealing of medium-frequency induction furnaces, the heating temperature is generally Ac3 + (30–50℃) for carbon steels and Ac3 + (500–70℃) for alloy steels. The holding time, on the other hand, must be determined based on various factors, including the type of steel, the dimensions of the workpiece, the loading capacity of the furnace, and the model of equipment used. To ensure that the undercooled austenite undergoes a complete pearlitic transformation, the cooling process during complete annealing must be slow—allowing the workpiece to cool gradually with the furnace until it reaches around 500℃, at which point it is removed from the furnace and air-cooled.
Incomplete annealing
Incomplete annealing is a heat treatment process in which an iron-carbon alloy is heated to a temperature between Ac1 and Ac3, using a medium-frequency induction furnace, achieving partial austenitization followed by slow cooling.
Incomplete annealing is primarily applicable to forged and rolled parts made of medium- and high-carbon steels as well as low-alloy steels. Its purpose is to refine the microstructure and reduce hardness. The heating temperature is Ac1 plus (40–60)°C; after holding at this temperature, the material is slowly cooled.
Medium-Frequency Induction Furnace Prices – Medium-Frequency Induction Furnace – Provided by Weifang Kanda Electric Furnace Co., Ltd. Medium-Frequency Induction Furnace Prices – Medium-Frequency Induction Furnace – Weifang Kanda Electric Furnace Co., Ltd. is Weifang Kanda Electric Furnace Co., Ltd. (
www.kangdadianlu.com ) This year’s newly upgraded version—please note that the images above are for reference only. To obtain the contact information, please call the phone number listed on this page or on the images; the contact person is Manager Li.
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Kangda Electric Furnace specializes in the manufacture of the following equipment: KGCL series medium-frequency power supplies, KGPS series medium-frequency power supplies, GTR series medium-frequency induction heating furnaces...
Contact Information
Address: Yuhe Industrial Park, Weicheng District, Weifang City, Shandong Province
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