Tundish Refractory Materials
Tundish Nozzles for Casting Steel
Tundish nozzles play a critical role in the steelmaking process, as they control the flow of molten steel from the tundish to the mold during casting. Here are some features of tundish nozzles that...
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Tundish nozzles play a critical role in the steelmaking process, as they control the flow of molten steel from the tundish to the mold during casting. Here are some features of tundish nozzles that are optimized for casting steel:
- High-temperature resistance: Tundish nozzles used in steel casting must be able to withstand high temperatures of up to 1600°C, as well as thermal shock and thermal cycling. Materials such as zirconia, alumina-carbon, and magnesia are commonly used for tundish nozzles in steel casting, as they provide high-temperature resistance and excellent thermal shock resistance.
- Wear resistance: Tundish nozzles used in steel casting are subject to wear and erosion from the continuous flow of molten steel. To minimize wear and prolong the lifespan of the nozzle, materials such as alumina-carbon and zirconia are often used, as they provide excellent wear resistance and are less susceptible to erosion.
- Precise flow control: Tundish nozzles used in steel casting must provide precise flow control to ensure a consistent and stable flow of molten steel from the tundish to the mold. Flow control mechanisms such as internal pins, tubes, or cones are often used to regulate the flow of molten steel and prevent turbulence.
- Easy installation and maintenance: Tundish nozzles used in steel casting must be easy to install and maintain to minimize downtime and maximize productivity. Graphite tundish nozzles are often used in steel casting applications, as they are easy to machine and install, and provide a reliable and consistent flow of molten steel.
| zirconia tundish upper nozzle | Upper Nozzle | |
| Zirconia core | Outside | |
| ZrO2+HfO2(%) | ≥95 | |
| Al2O3(%) | ≥85 | |
| MgO(%) | ||
| C(%) | ≥3 | |
| Buik Density g/cm³ | ≥5.2 | ≥2.6 |
| Apparent porosity % | ≤10 | ≤20 |
| Crushing strength Mpa | ≥100 | ≥45 |
| Thermal shock resistance | ≥5 | ≥5 |
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