Ichiji Obinata and Hiroshi Tanaka
Casting experiments have been carried out in order to obtain 2S slabs of practical size by S.A.C. process. The results of examination of the slabs showed that, if suitable casting condition may be choosen, the macrostructures of slabs are homogeneous, consisting of fine equiaxed grains and the difference in the mechanical properties due to the position of the test pieces taken in a slab is very small. Casting molten alminium into a thin walled copper mould set in hot water and drawing the bottom of the mould downwards gradually, long cylindrical 2S slabs, having the diameter of 60 mm and 135 mm respectively, have been obtained. Macrostructures of the slab cast thus continuously in hot water were also homogeneous and no columnar crystals, which may be observable in the slab of ordinary continuous casting method using water cooled mould, have been detected. The surface appearance of the slab by S.A.C. process was almost smooth and the existence of ``bleeding band'' was not conspicuous.
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