Magnesia-carbon bricks are made of magnesia, re-burned magnesia, fused magnesia, high-purity magnesia, and high-quality graphite and bauxite additives. The price and performance of magnesia-carbon bricks are closely related to the graphite content in the bricks. As the graphite content increases, the strength of the brick decreases, the thermal expansion rate decreases, and the residual expansion rate increases.

Therefore, the graphite content in the bricks should be controlled at about 20%. Magnesia carbon bricks have little wettability to molten slag, have excellent spalling resistance and corrosion resistance, and are suitable for the slag line of the ladle, especially in the occasion of multiple furnace continuous casting. In order to meet the needs of producing clean steel, when refining in the ladle, the application part of the magnesia carbon brick has been expanded from the slag line to the side wall.

When building magnesia carbon bricks on the ladle, care should be taken not to mix with bricks with high Si02 content. Otherwise, it will increase the local melting loss of the magnesia carbon brick, and the melting loss mechanism is:

It is mainly used for the lining and taphole of the steel-making oxidation reformer, the hot spots of the high-power electric furnace wall, the inner lining of the refining furnace outside the furnace, and the slag line of the ladle.