Precautions when using a tundish (intermediate ladle) heater for baking.
2025-11-28
The tundish gets its name because it is located between the ladle and the continuous casting machine during operation; it is also referred to as a middle ladle or intermediate tank. There are many types of tundishes, with common shapes including rectangular and... T In terms of construction, the permanent lining of intermediate ladles can be either brick-laid or cast-in-place; the working lining can be lined with insulating boards, or applied via spraying or coating. In recent years, there has also been a trend toward using dry-mixed castables for integral forming of the working lining. ; The lining materials used can be acidic, alkaline, or neutral. However, the tundish structure is relatively simple and generally consists of a tundish bottom and walls. The bottom features a nozzle and an impact zone. ( board ) The ladle has an overflow groove along its upper edge, and some intermediate ladles are also equipped with slag-deflecting walls. ( board )。
For tundishes equipped with fused-quartz immersion nozzles, the nozzle section may not require baking or can be subjected to low-temperature baking. This is because prolonged high-temperature baking of quartz nozzles can degrade their thermal stability and even cause cracks to appear on the inner walls of the nozzles. During the casting process, this could lead to perforations or fractures (though the quality of the nozzle itself also plays a role).
For tundishes used in small billet continuous casting, most employ insulating boards as the lining. These tundishes are not subjected to baking; some steel plants merely perform a low-temperature bake, which serves only to dry them out. Typically, tundishes used in small billet continuous casting are equipped with: 3-6 A zirconia-based fixed-diameter nozzle. For this type of nozzle, it is essential to bake it thoroughly to prevent the risk of cracking during use. This is because zirconia products have exceptionally poor thermal stability; inadequate preheating can cause them to crack.
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Tel:+86-371-60960056
Mobile:+8613849187223
Email:zhongweigongyelu@126.com
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