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Steel-shell furnace Thanks to its many advantages—such as high durability, high efficiency, high productivity, low noise levels, and ease of maintenance—steel-shell furnaces have seen relatively rapid development in recent years. The magnetic yoke in a steel-shell furnace shields and “reflects” the magnetic flux lines generated by the coil, thereby reducing magnetic leakage, boosting productivity, and achieving energy savings of approximately 5% to 10%. The energy consumption of steel-shell furnaces ranges from 580 to 650 kWh/t, and the service life of the furnace shell exceeds 10 years.

Steel-shell furnace Unlike frame furnaces, this furnace features a high-strength, ring-shaped steel shell equipped with multiple larger inspection ports. During operation, these inspection ports remain closed; however, during maintenance, each port can be opened individually. The robust internal structure of the steel-shell furnace effectively prevents deformation that might otherwise occur due to tilted iron pouring, thereby extending the lining’s service life. Moreover, thanks to the furnace’s enclosed and sturdy steel shell—and the inclusion of sound-absorbing and insulating materials within—the operational noise is significantly reduced. Additionally, the robust steel shell effectively mitigates the risk of metal spatter from the induction coil, ensuring maximum safety during furnace operation. To achieve efficient thermal insulation and further extend the lining’s lifespan, this heavy-duty steel-shell furnace is also fitted with cooling rings at both the top and bottom, which help to maintain uniform lining temperatures and reduce thermal expansion.

Steel-shell furnace Not only does it feature a robust steel shell, but it also incorporates a specially designed thick-walled tubular coil structure optimized for induction melting. By carefully selecting the turn-to-turn spacing of the induction coil, we have achieved maximum conversion efficiency and minimized resistance. On the one hand, the thick-walled induction coil boasts a large current-carrying cross-section and uniform wall thickness, making it highly resistant to damage caused by electric arcs and thermal expansion. On the other hand, the coil is equipped with a specialized support system that securely locks each turn in place, ensuring excellent rigidity and significantly reducing vibrations induced by electromagnetic forces—thus greatly extending the service life of the furnace lining. Moreover, the induction coil is surrounded by a magnetic yoke covering 50% of its surface area, which effectively reshapes the magnetic field distribution. Additionally, isolation buffer pads further reduce noise and vibration while enhancing the efficiency of the magnetic yoke. The steel-shell furnace also employs an extended coil design, where the induction coil extends beyond the bottom of the furnace lining. This configuration ensures extremely uniform coupling between the charge load—from the top to the bottom of the furnace—and the magnetic field, thereby improving energy conversion efficiency and minimizing the impact of stirring forces generated by the magnetic field on the furnace lining at the bottom.