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Why are people starting to use medium frequency? Steel-shell furnace So, shall we talk about it today? The steel-shell structure consists of a medium-frequency power supply cabinet, a compensation capacitor bank, a steel-shell furnace body, magnetic yokes and water-cooled cables, a hydraulic station, and a tilting furnace control box, among other components.

In the medium-frequency melting industry today, medium-frequency steel-shell furnaces are structurally divided into two types: steel-shell furnaces with magnetic yokes and hydraulic tilting mechanisms, and aluminum-shell furnaces equipped with gear-reduction tilting systems. These furnaces boast a long service life—typically over 10 years under normal operating conditions—and excellent stability. This is due to the use of magnetic conductors, which serve two key functions:

1. The magnetic core is securely fastened to the induction coil using set screws, ensuring that the coil and the magnetic core form a stable structure.

2. The magnetic conductor can form a magnetic shielding barrier around the coil, resulting in energy savings—furnaces equipped with magnetic conductors consume 3% to 5% less electricity than those with aluminum shells. Casting is precise and stable; the hydraulic tilting furnace mechanism allows for excellent control over casting angle and speed, and boasts superior safety performance thanks to its built-in furnace-leakage alarm system and fire-resistant clay lining. Due to these outstanding features, steel-shell structures are preferred for furnaces with capacities exceeding 2 tons.

Medium frequency Steel-shell furnace Compared to aluminum-shell furnaces, steel-shell furnaces offer greater durability and aesthetic appeal. Particularly for large-capacity furnaces that require a robust structural rigidity, steel-shell furnaces are the preferred choice from a safety standpoint when tilting the furnace. The magnetic yoke made of silicon steel sheets effectively shields and directs the magnetic flux generated by the induction coil, thereby reducing magnetic leakage, improving thermal efficiency, increasing production capacity, and achieving energy savings of approximately 5% to 8%. The presence of a furnace lid further minimizes heat loss and enhances equipment safety. Steel-shell furnaces also boast a longer service life. In contrast, aluminum tends to oxidize severely at high temperatures, leading to metal embrittlement and fatigue.

At casting enterprise sites, it’s common to see aluminum-shell furnace shells—used for about a year—falling into disrepair and becoming severely worn. In contrast, medium-frequency steel-shell furnaces, thanks to their minimal magnetic leakage, have a significantly longer service life than aluminum-shell furnaces. Moreover, steel-shell furnaces offer far superior safety performance compared to aluminum-shell furnaces. During smelting, aluminum-shell furnaces, subjected to high temperatures and intense pressure, tend to deform easily, resulting in poor safety margins. Steel-shell furnace Using a hydraulic tilting furnace ensures safety and reliability. At the same time, in terms of market prices, steel-cased furnaces are more expensive than aluminum-cased furnaces. In China, customers generally prefer steel-cased furnaces, whereas abroad, relatively more customers opt for aluminum-cased furnaces.