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Advanced SEM Methodology for Tracking Reoxidation in the Tundish

The tundish bath encounters strong reoxidation at caster start-up and at ladle exchanges. We use automated inclusion analysis to show the severity of these events on aluminum killed, calcium treated steel. CaS inclusions made during ladle refining dissociate upon reoxidation in the tundish and form higher alumina compounds. The start of a cast sequence may show the lingering effect of oxidation for more than thirty minutes, and a ladle exchange may show it for more than ten minutes. The higher alumina phases formed during these events may contribute to clog events in the flow control casting channel.

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