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In this work we have concentrated on the effect of aluminium on the formation of segregation during casting and the resultant effect on the microstructure and properties of multiphase steel.Different processing conditions were applied on the basis of model calculations in order to promote and suppress banding in segregated and non-segregated steel.It is shown that Al segregates preferentially to the solid during solidification,in contrast to the other elements which segregate preferentially to the liquid and increasing Al content leads to a increased partitioning of the other chemical elements.It has been shown experimentally,and in good agreement with the predicted model calculations,that the effect of segregation second phase banding can be suppressed.The tensile behaviour of all the variants is identical up to the yield point,but the non-banded samples show a much higher tensile strength with similar levels of ductility to the banded samples.