Zirconia Insert Nozzle
Using this zirconia insert nozzle offers the following advantages:
Enhanced continuous casting efficiency
Improved billet quality
Reduced Production Costs
Products Description
Using this zirconia insert nozzle offers the following advantages:
- Enhanced continuous casting efficiency: Due to its excellent wear resistance and corrosion resistance, the zirconia ceramic insert maintains stable orifice diameter and molten steel flow characteristics. This reduces the frequency of nozzle replacements, thereby improving continuous casting efficiency.
- Improved billet quality: The insert precisely controls molten steel flow rate and velocity, preventing issues like flow deviation and dispersion. This enhances billet quality and dimensional accuracy while reducing casting defects.
- Reduced Production Costs: Although zirconia ceramic inserts have a relatively high initial cost, their extended service life and superior performance reduce refractory consumption, lower production costs, and minimize downtime, delivering significant overall economic benefits.
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Preparation Process
- Ingredient Mixing and Premixing: Stable zirconia, monoclinic zirconia, and other raw materials are added to the machine in specific proportions for premixing to ensure uniform composition.
- Forming: Multiple forming methods can be employed, including slip casting, slip injection, pressure vibration forming, and isostatic pressing. Among these, isostatic pressing achieves higher density and superior performance.
- Firing: The formed green bodies are placed in a high-temperature furnace for firing. The firing temperature typically ranges from 1520 to 1760°C, with a holding time of no less than 6 hours to ensure the zirconia ceramic insert achieves optimal performance.
FAQ
Q: What is a zirconia tundish metering nozzle?
A: It comprises a zirconia insert (inner zirconia nozzle) and an outer body such as high-grade alumina-carbon. It is manufactured by a unique process of directly pressing the outer body around the zirconia nozzle without using the cement joining, providing no risk of steel leakage between the inner and outer body.
Q: What are the advantages of using zirconia tundish metering nozzles?
A: Zirconia offers high heat resistance, chemical stability, and good wear resistance.
Q: How does the zirconia tundish metering nozzle affect the quality of the cast product?
A: It helps maintain a precise and consistent flow of molten metal, leading to improved microstructure and mechanical properties of the final product.
Q: How is the size of a zirconia tundish metering nozzle selected?
A: The size of a zirconia tundish metering nozzle is selected primarily based on the desired steel flow rate required for the casting process, considering factors like the steel grade, desired casting speed, tundish design, and the number of strands being cast, with the nozzle bore diameter directly impacting the flow rate; larger diameters allow for higher flow rates and smaller diameters for lower flow rates.
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