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Application of magnesium refractory coating on tundish

2025-12-08

What is Magnesia Refractories Coating?

Magnesia refractory coating uses fused magnesia as aggregate and silica fume as binder. It exhibits strong adhesion, plasticity, and resistance to deformation, making it easy to apply, requiring minimal water, preventing slippage, and avoiding bulging or cracking during baking. It resists both hydration and the erosion of covering agents, provides excellent thermal insulation, has a long service life, and automatically detaches from the permanent layer of the tundish after cooling. With advanced technology, it removes impurities from molten steel, thus purifying it.

The Principle of Magnesium-Based Tundish Coating Technology

Magnesium-based tundish coating technology involves coating the inner wall of the tundish with a layer of magnesium-based material. Through the reaction between the magnesium-based material and the molten steel, a protective film is formed, thereby improving the fluidity and wettability of the molten steel and enhancing its stability and uniformity during continuous casting. Magnesium-based coating mainly involves the selection of the coating agent, the coating process, and the formation of the coating layer.

The Impact of Magnesium-Based Tundish Coating Technology on Molten Steel Quality

Magnesium-based tundish coating technology significantly improves the fluidity and wettability of molten steel, allowing it to flow more smoothly into the crystallizer, reducing the formation rate of slag inclusions, and improving the purity and uniformity of the molten steel. Simultaneously, this technology effectively removes gas from the molten steel, reducing its porosity and increasing its density and compactness. Through these methods, magnesium-based tundish coating technology significantly improves the quality of molten steel, enabling it to meet the needs of various applications.

The Impact of Magnesia-Coated Tundish Technology on Continuous Casting Efficiency

Magnesia-coated tundish technology improves the fluidity of molten steel within the crystallizer, allowing it to flow more smoothly into the crystallization surface. This reduces the residence time of the molten steel in the crystallizer, minimizing non-directional solidification and thus improving the surface quality and internal microstructure uniformity of the billet. Simultaneously, this technology also reduces the reaction between the molten steel and the crystallizer material, decreasing the thickness of the solidified shell and increasing continuous casting efficiency. Through these methods, magnesium-coated tundish technology significantly improves continuous casting efficiency, resulting in more stable and reliable billet quality.