tundish metallurgy

The traditional tundish is an excessive container in the continuous casting process, which only serves to uniform the composition and temperature of the molten steel, reduce pressure, divert the molten steel and remove inclusions. With the increasing requirements for steel quality, people have put forward a new view on the location of molten steel refining in the steel production process, that is, using the tundish as a refining reactor between the ladle molds to further improve the quality of the cast slab .



When tundish is used as a refining vessel, it can complete the following metallurgical functions: Purification function-to produce high purity steel, slag wall, argon blower, ceramic filter and other components are used in tundish, together with slag remover materials , Can greatly reduce the content of non-metallic inclusions in steel, and has achieved obvious results in production practice. Temperature adjustment function-in order to make the temperature difference of the molten steel before, during and after the tundish process less than 5℃, reach the standard temperature and remain stable, expand the equiaxed crystal area of ​​the continuous casting slab and reduce the center segregation, the tundish can be reduced To adjust the temperature of molten steel, measures such as scrap steel and iron powder injection. In addition, you can fine-tune the composition of molten steel. There is a tundish center hole to feed aluminum, barium, boron and other cored wires to the mold. It can realize the fine adjustment of the alloy composition in the molten steel, which not only improves the yield of easily oxidized elements, but also avoids the clogging of the nozzle; tundish also has a refining function , Add double-layer slag to the surface of the tundish molten steel to absorb the floating inclusions in the steel, or adding solid calcium cored wire to the tundish to change the Al2O3 inclusions in forms to prevent the tapping hole from being blocked. And, tundish also has a heating function. In tundish, induction heating and plasma heating are used to accurately control the molten steel pouring temperature.

In summary, the realization of the above functions can further purify the purity of the molten steel entering the mold. Therefore, the tundish is regarded as a continuous metallurgical refining reactor, which has become an independent steelmaking production process. Metallurgical reactors, which have achieved remarkable results in production, have sufficient guarantees for product quality, and are more economically advantageous.