Types and characteristics of refractory materials for tundish lining

The tundish is located between the ladle and the continuous casting machine, and has a rectangular shape and a T-shape. The refractory materials used for the lining of the tundish are also diverse. The permanent layer castable is made of high-alumina bricks and castable as a whole.

The working layer is equipped with thermal insulation board, smearing material, and integrally cast with dry castable. The material is acidic, neutral, and alkaline. Because the tundish has a bottom and a wall, the structure is simple. Moreover, there are nozzles and impact areas at the bottom, and overflow grooves or retaining walls along the wall of the bag.

The tundish is the refractory lining that is the most frequently overhauled in steel plants. It must be used for future development, and the construction is quick and convenient. The permanent layer of the tundish is also made of high-aluminum castable, which is installed or painted as needed. If the permanent layer is castable as a whole, the cladding must be cleaned before pouring, and the tundish nozzle can be placed before demoulding, and the bottom can be poured with high-aluminum castable. The surface should be flat and vibrate densely. Do not stop during the mixing process of the castable, wait for the bottom to dry naturally for 24 hours, and then place the mold pouring ladle wall. The gap between the cladding mold and the steel plate is uniform, and the cloth should be uniform when the high-aluminum castable is poured. The thickness of the stack should not exceed 300mm. It can be demoulded and put on the baking table after natural curing for 24 hours.

If you use smears, the application is simple. Install the nozzle, block, tundish impact plate and slag retaining wall first. Then smear the mixed smear on the permanent layer. When the design thickness is reached, pierce the heat dissipation holes; smear the smear at the junction of the impact plate and the slag retaining wall into a slope. The surface of the overflow tank should also be smeared with tundish coating material.

In recent years, a lot of dry materials are used. The dry material construction is similar to that the permanent layer is cast with high-aluminum castables. The mold is fed and vibrated. After molding, the dry materials are evenly baked, and after reaching a certain temperature, they are demoulded and baked. 

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