It is well known that center segregation of continuous casting steel is muchimproved by low superheat casting.However, the low superheat casting is not utilized because of the problem of nozzle clogging.The techniques of electromagnetic stirring and reduction technique have been employed to improve the segregation even under the high superheat casting.In these methods.a large amount of equiaxed crystals is favorable to maintain the internal quality.Therefore, Iow superheat casting methodby a new type nozzle with air cooling and electromagnetic stirring was devised and teeming experiment using 500kg or 3t molten steel was carried out to investigate the cooling ability of the nozzle.With increasing the intensity of stirring.the flow rate was reduced by the effect of electromagnetic value and the temperature drop in the nozzle was increased from 22 to 50'C, From the experiment, thermal resistances of each part of nozzle were obtained, and it was estimated that temperature drop of 30'C is gained when the nozzle is applied to billet contin'Jous casting.
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Ayata et al. (1995) studied this question.