Dyson Technical Ceramics manufactures a comprehensive range of zirconia metering nozzles used for the continuous casting of steel. Nozzles can be supplied as a solid one piece or within a co-moulded high alumina body. Solid metering nozzles were historically supplied but in recent years many customers have shown preference towards a composite nozzle for reasons of economy. The composite nozzle method of manufacture pioneered by Dyson allows a nozzle to be manufactured without the use of cement jointing, using an insert and pressed outer body. This method of manufacture provides a reliable system with no risk of steel leakage between the insert and outer body. Zirconia nozzles are manufactured from a variety of raw materials depending upon the manufacturing route and service application. Dyson Zirconia ZPZ™ Metering Nozzles The Zirconia ZPZ™ series of products are acknowledged to be at the forefront of zirconia ceramics technology currently used in the continuous casting of steel. Many of our customers have achieved extended casting sequences when using ZPZ™ metering nozzles and numerous casting records have been achieved.
The ultra-high densities associated with the ZPZ™ family of products impart excellent erosion resistance even in the most severe casting environments. Consistent casting speeds are achieved and the products have a high resistance to oxygen lancing.
Exchangeable Metering Nozzles Dyson Technical Ceramics are closely involved with the development of nozzle changer systems in conjunction with both system manufacturers and steel plants.
Key features of nozzle changer systems include:
• Improved casting operator safety
• Enables longer casting sequences
• Improved metallurgical quality
• Flexibility – Ability to change the
nozzle diameter to suit desired casting speed Stationary (Upper/Inner) Nozzle The stationary nozzle is located within the tundish lining and conveys steel to the controlling exchangeable nozzle, which determines the steel flow. The stationary nozzle must be capable of withstanding long sequence times.
Dyson Technical Ceramics recommends the use of a stationary nozzle that incorporates a ultra-high density ZPZ™ insert. The ZPZ™ insert provides excellent erosion resistance and can provide extended casting sequence times.
