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Stopper system is normally used in tundish for con-casting of slab and bloom. Through adjusting the slot between the stopper and the upper nozzle, the steel flowing rate could be controlled. During the casting, there will be some erosion on the stopper and upper nozzle. So the quality of the upper nozzle is very important to tundish life.
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The PN series of upper nozzles with ZrO2 Insert feature high refractoriness, superior resistance to thermal shock, erosion/corrosion etc. Fitting together with PN serial of ladle shroud, stopper and SEN, tundish casting sequences will be remarkablely improved. The products have been used in decades of steelworks worldwide, gain high customer satisfaction.
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