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Refractory materials for LF refining furnace mainly include the following categories:
- Corundum or chrome-corundum castable: used for the lower furnace cover, with high refractoriness and good thermal stability, able to resist the thermal shock of three-phase electric arc, and long service life.
- High-alumina castable: used for the upper furnace cover, mainly for dust removal and sound insulation.
- Magnesium-chrome refractories: Traditionally used for off-furnace refining, but are being replaced due to their environmental pollution and health risks.
- Magnesia zirconium bricks, magnesia spinel bricks, low carbon magnesia carbon bricks: These materials are used to replace magnesia chromium refractory materials. Although their cost is higher and their service life is shorter, through improved formulas and processes, they have been Significant progress has been made.
The working principle of the LF refining furnace includes heating the molten steel through three-phase electrodes, stirring the molten steel with argon gas, and removing inclusions in the molten steel to achieve the purpose of adjusting the temperature, composition and continuous casting production rhythm.The working principle of the LF refining furnace includes heating the molten steel through three-phase electrodes, stirring the molten steel with argon gas, and removing inclusions in the molten steel to achieve the purpose of adjusting the temperature, composition and continuous casting production rhythm.
Refractory materials play a role in LF refining furnaces, including providing physical protection at high temperatures, chemical stability, thermal shock stability, and corrosion resistance. They ensure the reliability of the furnace under extreme working conditions, reduce maintenance costs, extend service life, improve production efficiency and flexibility, and contribute to energy conservation, emission reduction, and environmental protection.
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