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The classification of sizing nozzle

Source: | Author:ChangXing Refractory | Published time: 1637 days ago | 1031 Views | Share:
The classification of sizing nozzle
Sizing nozzle is mainly applied for small billet, big billet, rectangular billet and small plate, which is with following characteristic: 
1.High refractoriness 
2.High thermal shock resistance
3.Erosion stability 
4.Little size change
5.Long service life

Zirconium sizing nozzle classified as follows:
1. Same raw material nozzle
For this kind nozzle, both coat and inner made from same raw material. This nozzle with high strength, good integrity, and higher safety factor. However, this kind nozzle is very expensive, and rarely used by steel plant.
2. Combined type nozzle
The body of nozzle is a zorite and Aperture made with high Zr2O material. This kind nozzle with good integrity, high strength and cheap price.
3. Mosaictype nozzle
This one is the very common one made by our factory, which with Al2O3-C coat and Zr2O material inner, which with 8-10 hour and 12 hour service life.

For sizing nozzle, the most important thing are these:
1.High Erosion resistance from molten steel and slag. The nozzle should made from high purity zirconite, CaO , stable ZrO2 and manufactured alumina.
2.Good thermal shock resistance
As zirconite will decompose with high temperature, and ZrO2 with high coefficient of expansion, so when manufacturing nozzle, we should overcome this straitened circumstances.