The primary material used in ladle sliding nozzles is refractory. Specifically, the upper and lower slides are constructed of fired oil-impregnated aluminum-carbon refractory, the upper and lower nozzles are constructed of unfired oil-impregnated aluminum-carbon refractory, the upper seat is constructed of corundum castable bricks, and the lower seat bricks are constructed of unfired high-alumina bricks. These materials are selected to ensure stable operation at high temperatures, with excellent refractory properties and mechanical strength.

In detail, a sliding nozzle generally consists of a drive mechanism, a mechanical component, and a refractory component (including the upper and lower slides and the nozzle). The refractory component is the core of the sliding nozzle, directly contacting the hot molten steel and therefore ideally able to withstand high temperatures and maintain excellent stability. Fired oil-impregnated aluminum-carbon refractory and unfired oil-impregnated aluminum-carbon refractory are widely used in the manufacture of ladle sliding nozzles due to their refractory properties and corrosion resistance.

In addition, the upper and lower seat bricks are constructed of different refractory materials to meet varying application requirements. Both the corundum cast bricks and the unfired high-alumina bricks have excellent fire resistance and mechanical strength, ensuring the stability and reliability of the sliding nozzle during long-term use.