Formation Mechanism and Prevention Measurements of Macro-segregation during Continuous Casting Solidification

The macro-segregation of alloying elements during continuous casting steel has adverse effect on the quality of steel product.The nature of macro-segregation in casting is physical movement of liquid phase or solid phase during solidification.The causes of molten steel flow in continuous casting process were sum-marized,such as forced convection by external force,bulging and solidification shrinkage.Accordingly,the mechanisms of macro-segregation caused by these factors were analyzed. To solve macro-segregation,the technologies such as low superheat pouring,electromagnetic stirring and liquid core reduction at the end of solidification were applied.However,practice result shows that this problem could not be solved by using every individual technology alone.In order to improve the composition uniformity of continuous casting product,it is advised that the corresponding measurements should be adopted for each type of segregation.