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Energy-Saving Retrofit of Steel Billet Induction Heating Machine

May. 26, 2026

Traditional steel billet induction heating machine widely used in forging and rolling production generally suffer from low energy conversion efficiency, severe heat loss, and unreasonable power matching. Outdated SCR power units, aging coil structures, and backward temperature control systems lead to high power consumption, large temperature deviation, and excessive oxide scale. These problems not only increase production costs but also fail to meet current industrial green production and carbon reduction standards. Therefore, targeted energy-saving retrofit of existing heating equipment has become an essential measure for steel processing enterprises to reduce consumption, improve efficiency and upgrade production.

The core of the energy-saving retrofit lies in systematic optimization of Intermediate frequency induction heating power supply， heating structure, temperature control logic and heat preservation structure. First, the traditional SCR rectifier power supply is upgraded to high-efficiency IGBT inverter power supply. This optimization raises the electric energy conversion efficiency from below 85% to over 95%, and increases the power factor to 0.95 or above, effectively reducing reactive power loss and no-load power consumption. It avoids the energy waste caused by “large power driving small load” in traditional equipment and realizes efficient power output matching with billet heating demand.

medium-frequency induction billet heating machine

Energy-Saving Retrofit of Steel Billet Induction Heating Machine

Second, the heating coil and furnace body structure are optimized. The original ordinary copper coil is replaced with a refined water-cooled copper coil with optimized winding structure, which reduces magnetic flux leakage and improves electromagnetic induction utilization. Meanwhile, nano aerogel insulation materials and multi-layer thermal insulation structures are added to the furnace body. This greatly cuts down surface heat dissipation of the equipment, locks internal heating heat, and reduces invalid thermal loss. The overall heat utilization rate of the equipment is significantly improved.

In addition, an intelligent closed-loop temperature control system is installed to replace the original manual adjustment mode. Equipped with high-precision infrared thermometers and PLC automatic control program, the system dynamically adjusts heating power and feeding speed according to the size, initial temperature and production rhythm of steel billets. It controls the heating temperature error within ±5℃, eliminates overheating and insufficient heating, reduces billet oxidation rate to less than 0.5%, and avoids energy waste caused by repeated heating.

Energy-Saving Retrofit of Steel Billet Induction Heating Machine

After the systematic energy-saving retrofit, the equipment operation performance is comprehensively improved. The unit power consumption is reduced to 40–60kWh per ton of steel, saving more than 30% of electric energy compared with the original equipment. The continuous and stable heating capacity not only improves the surface quality and processing performance of steel billets, but also extends the service life of equipment components. Meanwhile, the retrofit reduces carbon emissions and equipment failure rate, lowers later maintenance costs, and realizes dual improvement of economic and environmental benefits. It provides a cost-effective green upgrading solution for the traditional steel billet heating process

Next: Process Introduction of Steel Billet Induction Heating Machine