Tundish Refractory Materials
Corrosion Resistant Tundish Lower Nozzle
Corrosion is a common problem in the steelmaking industry due to the highly corrosive nature of molten steel. To combat this, tundish lower nozzles can be made from corrosion-resistant materials to...
DESCRIPTION
Corrosion is a common problem in the steelmaking industry due to the highly corrosive nature of molten steel. To combat this, tundish lower nozzles can be made from corrosion-resistant materials to prolong their lifespan and improve the quality of the castings.
One commonly used corrosion-resistant material for tundish lower nozzles is alumina graphite. This material is a composite of alumina and graphite, which provides high strength and excellent resistance to corrosion. The alumina component provides resistance to the high temperatures of the molten steel, while the graphite component enhances the thermal conductivity of the nozzle.
Another material that is used for corrosion-resistant tundish lower nozzles is zirconia. Zirconia is a ceramic material with high chemical stability, which makes it resistant to the corrosive effects of molten steel. Additionally, zirconia has excellent thermal shock resistance, which means it can withstand sudden temperature changes without cracking or breaking.
Tundish lower nozzles can also be coated with a layer of refractory material to provide additional protection against corrosion. These coatings can be made from a variety of materials, including alumina, zirconia, and silicon carbide.
| Item | SX-1 | SX-2 | SX-3 | SX-4 | SX-5 | SX-6 | SX-7 | SX-8 |
| ZrO2+(Hf)O2% | >=70 | >=75 | >=80 | >=85 | >=90 | >=93 | >=93 | >=93 |
| Bulk Density g/cm3 | >=3.8 | >=4.0 | >=4.2 | >=4.4 | >=4.6 | >=4.9 | >=5.1 | >=5.2 |
| Apparent Porosity % | <=22 | <=22 | <=20 | <=20 | <=20 | <=15 | <=13 | <=10 |
| Mpa Compressive Strength | >=80 | >=80 | >=80 | >=80 | >=80 | >=90 | >=90 | >=100 |
| Thermal Shock Resistance (1100ºC cold water) | >5 | >5 | >5 | >5 | >5 | >5 | >5 | >5 |
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