The effects of electromagnetic stirring on cast structure of continuously cast SUS 430 slabs have been investigated in order to improve ridging of sheets by grain refinement of cast structure.
The results are summerized as follows:
(1) As stirring intensity increases, equiaxed crystal zone enlarges. Grain refinement of cast structure is influenced considerably by super heat (ΔT) of molten metals and even if stirring intensity increases equiaxed crystal zone hardly enlarges when ΔT reaches a certain temperature. Alternate stirring mode is most suitable for stirring. The effect of super heat on grain refinement of cast structure can be relieved by falling position of stirrer, but ratio of equiaxed crystal zone decreases. Suitable stirring conditions for high ratio of equiaxed crystal zone above 60% are found.
(2) As ratio of equiaxed crystal zone increases ridging of sheets from continuously cast SUS 430 slabs are improved. Ratio of equiaxed crystal zone above 50% is necessary to obtain almost the same ridging as sheets from ingots.
