Abstract: Through the change of total oxygen content in the tundish during the ladle exchange moment and the composition analysis of slag in tundish, meanwhile combining with the effects of ladle slag carry-over in continuous casting and the defects of slab, the influence of ladle slag carryover in continuous casting was obtained. The results showed that ladle slag carry-over deteriorated the liquid steel castability, causing the blocking of SEN and the oxidation of alloy element and reducing the molten steel purity. In severe cases, it might cause serious results such as corrosion of SEN, solidified crust of tundish slag and so on. According to the characteristics of steel quality requirements, the development of differential ladle slag control process can effectively balance the product quality and the production costs.

Key words: ladle slag carry-over, reoxidation, total oxygen content, ladle slag detection