In casting slab and Bloom, the slug system is usually used to control the flow of molten steel in Tundish. The injection speed of molten steel from Tundish to mold is mainly controlled by adjusting the slug and the gap between the slug and the Tundish. During the whole casting process, the plug rod and the bowl of the Tundish nozzle will have some erosion and scour. When the contact surface of the plug and Tundish has abnormal erosion, it can not be used again after the proper steel injection speed can not be guaranteed. Therefore, the quality of the nozzle on the package has an important impact on the service life of the package. The main component of the nozzle liner of PN series zirconium-inlay lining Tundish upper nozzle is zirconia, which has the characteristics of high fire resistance, good thermal shock stability, corrosion resistance and erosion resistance, it can obviously increase the number of Tundish single casting furnace. This series of products have been used in many steel plants, such as Lianyuan Steel, Xinyu Steel, Suzhou Steel, Wuhang steel and so on. Packing: in cartons or wooden cases. Note: handling, loading and handling should be handled gently, to avoid rain, water.