Quick-change Nozzles Must Have Excellent Thermal Shock Resistance And Erosion Resistance

Zirconium quick-change water outlet is one of the tundish refractory materials in continuous casting process. It is mainly used for small billet continuous casting and can control the flow of molten steel. The quick-change water outlet must have excellent thermal shock resistance and erosion resistance to ensure that the molten steel can flow into the crystallizer evenly and steadily through the quick-change water outlet, thus ensuring the normal progress of the continuous casting process and increasing the production efficiency. The zirconium quick-change water outlet is made of stable zirconia after being stabilized by a special process, and is formed by high-pressure molding and high-temperature firing.

　　 Zirconium quick-change nozzles are widely used in small billet continuous casting tundish. The performance of the nozzle will directly affect the length of continuous casting time. The reliable serviceability of the quick-change nozzle is very important for providing high-quality molten steel for billet continuous casting machines and successful casting operations. It can not only increase the number of continuous castings, but also directly improve production efficiency. Therefore, the quick-change water outlet must have good erosion resistance, erosion resistance and thermal shock stability, and no problems such as clogging, cracking and diameter expansion can occur during use.

At present, when producing zirconium quick-change water outlets in China, high-purity zirconia usually uses calcium oxide or magnesium oxide as a stabilizer. The content of zirconium oxide is generally controlled at about 95%, and the resistance of calcium oxide to the erosion and erosion of steel liquid is not High, magnesium oxide is prone to falling off after long-term use at high temperature. Using fused magnesia partially stabilized zirconia, fused calcium oxide partially stabilized zirconia, and zirconia as raw materials, adding certain additives and binders, rationally adjusting the particle gradation of raw materials, optimizing the molding process, and adjusting the oxidation in the products The stabilization rate of zirconium changes the performance of the zirconium quick-change water outlet.

When the forming pressure is about 300MPa, the bulk density of the zirconium quick-change water outlet is large, the porosity is low, and there is no crack in the zirconium quick-change water outlet after molding, the molding effect is good, and the additive can promote the zirconium quick-change water outlet Sintering is conducive to the increase of density and the decrease of apparent porosity, and the improvement of thermal shock resistance is more obvious. The zirconium quick-change water outlet is made of high corrosion-resistant refractory material, and the diameter of the water outlet remains basically unchanged throughout the continuous steel casting process. It is used for the plugless casting system of small billet continuous casting intermediate tank, which can ensure a stable pulling speed during the continuous casting process. Usually made of zirconium (ZrO2 is 60%~95%) material. I hope you can understand the zircon quick-change water outlet by reading the above information, and you can fully use the zirconium quick-change water outlet through reasonable application to achieve good results.