Technical Effects:
The integration of electromagnetic induction heating in the continuous casting process within Chinese steel plants has yielded remarkable technical effects, particularly in the context of temperature management within the tundish. When the target temperature is set at 1595℃, the following observations were made:
Temperature Stability: In the absence of electromagnetic induction heating, the molten steel's temperature in the tundish exhibited fluctuations within a range of ±8℃. This variability can lead to inconsistencies in the casting process. However, with the application of electromagnetic induction heating, the temperature control was significantly enhanced, maintaining a much tighter fluctuation range of ±3℃. This precise temperature control is pivotal for the quality and uniformity of the final steel product.
Low Superheat Constant Temperature Casting:The use of this technology has essentially achieved low superheat constant temperature casting throughout the entire casting process. This means that the molten steel is cooled to a lower temperature before solidification, which reduces the thermal stress on the cast slab and improves its structural integrity.
Enhanced Equiaxed Grain Ratio: One of the key benefits of this technology is its impact on the equiaxed grain ratio of the cast slab. Improved temperature control allows for better nucleation and growth of equiaxed grains, which in turn enhances the mechanical properties of the steel, such as ductility and toughness.
Prevention of Nozzle Clogging: Maintaining a consistent temperature within the tundish helps prevent the clogging of the nozzles, which is a common issue in continuous casting. Clogging can lead to interruptions in the casting process, increased downtime, and a decrease in production efficiency. The electromagnetic induction heating system mitigates this risk by providing a stable flow of molten steel.
Increased Casting Speed:With improved temperature stability and reduced risk of clogging, the casting speed can be increased. This acceleration in the casting process translates to higher production rates without compromising the quality of the cast slab.
Economic Benefits:The implementation of electromagnetic induction heating not only improves the quality of the steel but also brings about economic benefits. These include reduced energy consumption due to more efficient cooling, lower maintenance costs due to decreased downtime, and increased yield due to improved product quality and reduced wastage.
In summary, the application of electromagnetic induction heating in the continuous casting tundish has proven to be a significant technological advancement in the steel industry. It offers a range of technical benefits that enhance the quality of the steel, increase production efficiency, and provide economic advantages, making it an invaluable addition to the steelmaking process.
| Technical parameters sheet of tundish induction heating system | ||||
| No. | Item | Technical parameters | ||
| 1 | Type | Structure with upper and lower iron core separated | ||
| 2 | Cooling method | Compound cooling method of air cooling + Aerosol cooling | ||
| 3 | Voltage | 2400V | ||
| 4 | Power | 1200-1600KW | ||
| 5 | Frequency | 40~150HZ adjustable frequency conversion | ||
| 6 | Phase | Single phase | ||
| 7 | Insulation Class | Class C | ||
| 8 | Self weight of the inductor body | The total weight is about 4000kgs | ||
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