Zirconia Tundish Nozzle
Zirconia tundish nozzles are critical functional components installed at the bottom of steel continuous casting tundishes. Constructed primarily from zirconia, they precisely control molten steel flow into the mold.
Products Description
Zirconia tundish nozzles are critical functional components installed at the bottom of steel continuous casting tundishes. Constructed primarily from zirconia, they precisely control molten steel flow into the mold. The service life of zirconia tundish nozzles is influenced by multiple factors, including material composition, production processes, molten steel composition, and continuous casting techniques. Typically, standard zirconia ladle nozzles have a service life of approximately 10-12 hours. However, long-life zirconia ladle nozzles, developed through optimized production processes and material enhancements, can achieve significantly extended service lives.
Anyang Changtai Silicon Industry Co., Ltd. has increased the service life of zirconia ladle nozzles from 20 to 30 ladle cycles by adjusting production processes.
Changtai's main products include zirconia nozzles, tundish nozzles, zirconia slides, and other refractory and thermal insulation materials. These products are primarily used in industries such as continuous steel casting and powder metallurgy casting. If you need to purchase related products, please click the button below to contact us !
Factors Affecting the Service Life of Zirconia Nozzles
The composition and manufacturing process of the material fundamentally determine its lifespan.
Higher zirconia content enhances erosion resistance. For instance, 93% zirconia nozzles exhibit superior resistance to molten steel erosion and chemical corrosion compared to standard nozzles containing 72%-85% zirconia.
Common stabilizers like MgO and CaO are used, and their proportions affect the crystalline phase stability of zirconia.
Forming pressure, sintering temperature, and holding time directly impact the nozzle's density.
Actual conditions during continuous casting are the primary external factors accelerating nozzle wear.
Oxidizing substances in molten steel, such as FeO and MnO, react with zirconia, accelerating nozzle erosion. Excessively high continuous casting temperatures further accelerate chemical reaction rates, shortening service life.
Longer continuous casting durations prolong the cumulative exposure of nozzles to high-temperature erosion and corrosion, leading to more severe wear.
If the slag in the ladle has excessively high alkalinity or contains significant amounts of FeO and MnO, it reacts chemically with the nozzle surface to form low-melting-point compounds. This causes surface spalling and reduces service life.
Standardized operations minimize unnecessary wear.
Improper sealing between the nozzle and ladle brickwork during installation can cause molten steel leakage, leading to localized erosion of the nozzle. Improper handling during nozzle replacement may cause cracks, shortening subsequent service life.
Failure of the nozzle cooling system during continuous casting can cause localized overheating, accelerating material aging. Accumulation of slag residues in the ladle that is not promptly removed can intensify localized erosion, affecting the overall service life of the nozzle.
Applications
our Four Major Advantages
Strong Corporate Capabilities
Equipped with multiple high-temperature tunnel kilns, fully automated batching production lines, a dedicated R&D center, and testing laboratories
Consistent Product Quality
Premium raw materials and advanced processes ensure excellent high-temperature physical and chemical properties, withstanding erosion, deformation, and delamination.
Customization Support
Accepting diverse custom requirements, Changtai Silicon's sales network spans domestic markets and extends globally.
Prompt After-Sales Service
Should you encounter any issues during product use, we provide timely technical support within 48 hours.
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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