In order to elucidate fundamental phenomena taking place in the twin roll strip casting process and effects of the key process variables on the thickness and the surface and internal qualities of strip, an experiment in the direct casting of stainless steel strip was performed under wide experimental conditions using a laboratory-scale twin roll caster. In the experiment, it was found possible to cast thin strip with good surface quality and fine solidification structure by the twin roll process. Furthermore, on the basis of the experimental results and a theoretical analysis of the heat transfer, fluid flow and solidification in the process, the fundamental phenomena affecting the thickness, surface quality and solidification structure have been investigated. As a result, the mechanism determining strip thickness, effects of the process variables on the formation of strip surface, the relation between heat transfer and solidification in the strip have been made clear. The fluid flow near the rotating roll surface and the heat transfer between roll and metal have been found to be very important for the formation of better surface quality and solidification structure of the strip.
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