Thick plate blank macrosegregation calculation method based on blank shell bulging and mechanical pressing

Abstract

The invention belongs to the field of thick plate blank continuous casting production, and particularly relates to a thick plate blank macrosegregation calculation method based on blank shell bulgingand mechanical pressing. According to the method, the real shell deformation of the casting blank is considered. A thick plate blank macrosegregation calculation model based on the asymmetric blank shell bulging morphology and solidification tail end mechanical pressing is established. The calculation precision of the internal macrosegregation behavior of the thick plate blank is further improved.The mechanical reduction process parameters of the solidification tail end of the thick plate blank are systematically studied. The influence rule of factors such as asymmetric distribution of the casting blank shell bulging on the flowing and macrosegregation behaviors of the solute-enriched molten steel is regular. Data support is provided for making a reasonable casting system and a pressing system, and great theoretical guiding significance is achieved for improving the actual application effect of the continuous casting thick plate blank solidification tail end pressing process and solving the technical problem that macrosegregation of the thick plate blank is serious.

Description

technical field [0001] The invention belongs to the field of thick slab continuous casting production in the iron and steel metallurgical industry, and in particular relates to a thick slab macro segregation calculation method based on billet shell bulging and mechanical pressing. Background technique [0002] Since continuous casting thick slabs are often cast at low casting speeds, the solidification rate is low, and as the cross-section widens and thickens, the internal cooling conditions deteriorate, and the columnar dendrites develop, which hinders the long-distance transmission of solute elements between dendrites and tends to Enrichment makes serious macro-segregation inside the thick slab. In the subsequent heating and rolling process, the macro-segregation defects of the thick slab cannot be effectively eliminated through high-temperature diffusion and rolling deformation, thus affecting the quality of the final product. [0003] In the last century, some scholars ...

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Problems solved by technology

However, the hypothesis of shell bulging morphology in this study cannot restore the real shell bulging deformation to the greatest extent, nor can it accurately describe the shell bulging under the soft or heavy reduction process at the end of solidification. Morphology will greatly affect the accuracy of macro-segregation calculation during the solidification process of the slab

[0009] At present, there are many related technical patents and papers on the macro heat transfer behavior, reduction process design and macro segregation simulation calculation in the continuous casting process, but the quantitative calculation method of the macro segregation behavior considering the deformation of the real slab shell of the thick slab is still scarce. There are reports

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