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Synopsis Solidification behaviours in the continuolls(y cast slabs of mild steel were determined by addition of radioactive gold and solute distribution in the slabs under various casting conditions was analysed, comparing with lhe solidification stmctures . From these experimental data, the flow velocity in Ihe liquid jlool and solute segregation in the cenler of the slabs were estimated mathematically, using the boundary layer Ihe01Y and partial mixing model in liquid. The liquid f low along the shell is comjlosed of the nou le jet, the natural convection and the bulging flow , the amount of its velocity being 10 to 40 Clll /sec, 1 to 2.5 clll/sec and 2 to 4 cm/sec. The cenler segregation is mainly caused of solule redistribution during uni-directiollal solidification in colulIlnar Cly stal reg ion , which inlensity is strongly dependent on the rate of solidification and Ihe liquid flow, especially the bulging flow. T o reduce the center segregation , increasing Ihe equiaxed c,ystals and minimiz ing the bulging were eifective, which are relaled to lhe amount of cooling water, casting speed, casting temjlerature , slab Ihickness and Ihe machine arrangement .

A Study on Solidification, Segregation and Fluid Flow of Molten Steel in Continuously Cast Slabs