Clogging in the upper nozzle restricted the maximum sequence length achievable on the continuous casting machines used for aluminum killed steel production. It was identified that one of the contributing factors for the clogging was the shape of nozzle bore. Plant observations and performance data were collected and used to help define the requirements from an operational steel plant perspective. These requirements were then used and an improved nozzle bore profile was developed based on the careful review of the molten steel flow in the tundish and the nozzle. The developed nozzle was then tested on the operational plant and further observations and performance indicators were evaluated to show that it decreased the level of clogging and thus increased the capability of the plant to achieve extended sequence lengths.
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