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@chinaelong
Based on functions, the submerged entry nozzles manufactured by our company are classified into plug-in type, hanging type and fast renewal type; and based on material quality, nozzles mainly classified into aluminum carbon, zirconium carbon and magnesia carbon. This product enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance
The Zr metering nozzle manufactured by this company is specially used for the tundish gating system without plug stick in the small square-base continuous casting machine, and it is more suitable for multi-thread and small square-base continuous casting machine. All nozzles adopt special-type and high-quality refined raw materials with reasonable structure and strong erosion resistance. In the entire course of pouring, there is little change in diameter of the nozzle with stable speed. Nozzles of the mosaic type, combined type and entire difference type can also be provided as required by customers.
Ladle upper/lower nozzle series are developed with the newest matrix optimization technology and the theory of the most compact. They are characterized by good thermal shock resistance, strong washout resistance, steady quality and long life.
Methods of Eliminating the Phenomenon of Ladle Nozzle Clogging
A ladle nozzle is one of the slide gate ceramic elements. Systematic extension of the length of the steelmaking ladle campaign increases the demands on a ladle nozzle. The ideal solution would be a ladle nozzle which withstands the entire ladle campaign. In addition to thermal stability, ladle nozzles must be characterized by high resistance to corrosion and erosion caused by the flow of steel. An important factor affecting the durability of a ladle nozzle is clogging due to steel deoxidation products deposition in the nozzle channel. The phenomenon of clogging makes it difficult to regulate the rate of steel outflow from the ladle and, in extreme cases, can make the nozzle channel close. Clearing the nozzle by oxygen lancing accelerates its destruction. Methods to prevent clogging:
1. Ladle Refining Practice. A vacuum degassing treatment yields better cleanliness than does argon bubbling.
2. Reoxidation Prevention. Submerged ladle-to-tundish pouring, shielded tundish surface, ann leak-tight refractory joints will reduce exposure of the steel to oxygen and thereby improve cleanliness.
3. Oxygen absorber Prevention.Optimal tundish flow patterns as well as filtration and electromagnetism techniques can remove Oxygen absorber products from the melt.
4. Flux Enrainment Prevention. Submerged ladle-to-tundish pouring and avoidance of ladle slag carryover will reduce the amount of exogenous inclusions in the melt.
The requirements of refractory sliding nozzle
Sliding nozzle mainly stalled in the bottom of ladle, whose applied condition has got a big improvement comparing with plug, as its refractory part does not soak in molten steel for a long time. To sliding nozzle, slide gate is the key section, as its quality influences life span of nozzle directly.
The lower/upper nozzle only as a role of alleyway for steel running, but the upper nozzle is required to resist high temperature and eroding, which has the same life span of ladle well block. The lower nozzle is only used for one time, so which holds less demand than upper nozzle.
Both of upper/lower sliding plate are beard fastening pressure, and also required to slid and no molten steel overslow between them when pouring. So it is required to take finish machining to slip plan of upper and lower sliding plate, to make sure high parallelism and smoothness, besides, both of them are required rather high mechanical property.
Now the material of sliding plate mainly include: High alumina, Magnesia, Aluminum silicon carbide, Aluminum chromium, Aluminum carbon, and Aluminum zirconium carbon.
Above materials can be made into burned and unburned skateboarding brick.
As high quality sliding plate is expensive, one can choose compound sliding plate, which is more appliable and economical.
Based on functions, the submerged entry nozzles manufactured by our company are classified into plug-in type, hanging type and fast renewal type; and based on material quality, nozzles mainly classified into aluminum carbon, zirconium carbon and magnesia carbon. This product enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance
This product selects high-quality materials, pressing in molding machine, and low baking, It can be used with all kinds of tundish nozzles, and this product has advantages of high product strength, good thermal shock stability and erosion resistance.
Tundish castable Refractory
This product used extra alumina as the principal raw material and it is made of various additives. This product is characterized by favorable stability of heat and shock resistance, high strength and no chipping, with service life over 250 times.