A combined pressing method for continuous casting slabs

Abstract

The invention discloses a continuous casting slab combined reduction method, by establishing a solidification model before the continuous casting slab is pressed, determining the solidification end position and central solid phase ratio of the slab, and predicting the final formation position of the macro segregation in the center of the slab The critical solid phase ratio and the critical solid phase ratio at the position where the central porosity begins to form. At the end of the slab solidification, the central solid phase ratio is less than the critical solid phase ratio at the final formation position of the macrosegregation. Regions greater than the critical solid fraction at which central porosity begins to form are under heavy pressure. And the reduction model is used to predict the improvement effect of different reduction amounts on central segregation and porosity, so as to determine the optimal reduction position and reduction amount. The invention can effectively improve the segregation and porosity of the slab center, and can predetermine the optimal reduction parameters at the same time, realize the optimal reduction effect and reduce the experiment cost.

Description

technical field [0001] The invention relates to the technical field of continuous casting production, in particular to a combined pressing method for continuous casting slabs. Background technique [0002] Macro segregation and central porosity are the main internal defects of continuous casting slabs, and improper control will seriously affect the quality of steel products. Mechanical reduction is the main technical means to improve the internal quality of the slab, especially for macro segregation. With the advancement of technology, the current dynamic soft reduction technology can control the center segregation within a certain range, but the improvement of the center porosity by the light reduction technology With little success. This is mainly determined by the formation characteristics of macro-segregation and central porosity. The applicant’s research shows that the final formation position of macro-segregation is before the end of solidification, and the position w...

AI Technical Summary

Problems solved by technology

Although a few studies have given the exact position of reduction and the range of reduction amount, there is no relevant basis for it. Therefore, it is obvious that the process effect cannot be stably and reliably exerted

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