Abstract
Tundish-heater by utilizing channel type electromagnetic induction heating method has been newly developed to prevent the temperature drop of molten steel in tundish at the start, the end of casting and the ladle change in continuous casting. The effect of tundish-heater on temperature of molten steel and qualities of cast slabs of stainless steels have been investigated.
The results obtained are as follows:
1) The degree of the temperature drop of molten steel in tundish without heater at the start of casting is 1020°C, on the contrary that with tundish-heater to be 05°C. Temperature drops at the end of casting and the ladle change can be perfectly prevented.
2) Number of the subsurface inclusions in stainless steel slabs cast at such unsteady states decreases to 1/41/12 compared with that of slabs cast without heating. Surface and internal qualities of coldrolled sheets are also improved to the level of the sheets cast at steady state.
3) The strong stirring of molten steel in tundish by electromagnetic force can be considered as one of the effect of removal of large inclusions.
