Method for determining steel belt feeding process parameter of crystallizer in thick slab continuous casting process

Abstract

The invention relates to a method for determining the steel belt feeding process parameter of a crystallizer in the thick slab continuous casting process. The method comprises the steps the work condition parameter of the crystallizer in the thick slab continuous casting process is collected, and the feeding quantity of a cold steel belt is determined through the work condition parameter of the crystallizer in the thick slab continuous casting process based on the liquidus congruent melting and phase change heat transfer theory; a continuous casting slab-cold steel belt system phase change heat transfer theoretical model is built through a generalized enthalpy method, namely, a relation model among the melting time and feeding thickness of the cold steel belt, the superheat degree of casting molten steel and the initial temperature of the cold steel belt; the section size and feeding speed of the cold steel belt are determined through the continuous casting slab-cold steel belt system phase change heat transfer theoretical model according to the feeding quantity and melting time of the cold steel belt and the depth of a solidified liquid core; and the cold steel belt with the determined section size and feeding speed is preheated and fed into molten steel in the crystallizer through the position between a water opening and a narrow face of the thick slab crystallizer parallel to the wide face of the crystallizer in a low-amplitude high-vibration manner.

Description

technical field [0001] The invention belongs to the field of thick slab continuous casting production, and in particular relates to a method for determining process parameters of a crystallizer feeding strip in the thick slab continuous casting process. Background technique [0002] Compared with the traditional mold casting process, the continuous casting process is a major technological progress, but many inherent product defects restrict the quality of continuous casting products. The general problems to be solved for medium-thick slabs, extra-thick slabs and thicker rectangular slabs are internal quality defects such as center segregation, center porosity, center cracks, and low equiaxed crystal ratio. Defects such as center segregation and center porosity of continuous casting slabs are bottlenecks that restrict the further improvement of thick slab quality, so eliminating or controlling problems such as center segregation, center porosity and cracks is the key to solvi...

AI Technical Summary

Problems solved by technology

These measures are a good way to clean and homogenize molten steel and reduce internal defects of slabs; however, the degree of improvement is limited, and excessive requirements will increase the difficulty of smelting and increase the cost of smelting

Slight reduction at the end of the liquid core compensates the solidification shrinkage of the slab by applying pressure near the end of the liquid core to compensate for the solidification shrinkage of the slab. On the one hand, it can eliminate or reduce the internal voids formed by the shrinkage of the slab and prevent intergranular enrichment The molten steel with solute elements flows laterally toward the center of the slab; on the other hand, the extrusion effect generated by light pressure can also promote the reverse flow of molten steel enriched with solute elements in the center of the liquid core along the direction of casting, so that the solute elements are Redistribution in the molten steel, so that the solidified structure of the slab is more uniform and dense, which plays a role in improving center segregation and reducing center porosity. This technology has a significant effect on improving the internal quality of thin slabs, but the effect on thick slabs is not significant

Electromagnetic stirring technology can increase the equiaxed crystal ratio on the cross-section of the slab, thereby effectively improving the ce

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