Abstract：Some longitudinal cracks on the surface of the continuous cast slab SS400 were detected. The slabs with these cracks were analyzed by the means of high temperature plasticity , macrostructure, microstructure and inclusion test. The results showed that the reasons caused the surface longitudinal cracks included the high content of [S] in the molten steel , the inclusions in the slab, the variable slab surface shell thickness ,unreasonable mold taper and straighten temperature. Some ways to control the surface cracks in the continuous cast slab were proposed.
2009, Vol. 28 
