Abstract
The flow behavior in the mold has a considerable influence on the final product quality of the strand. In this paper, the variation of flow field, level fluctuation, and liquid slag distribution was analyzed by a hydraulic modeling experiment of a high-speed billet continuous casting mold with and without consideration of hydrostatic pressure and a solidified shell. The results indicate that a mold with hydrostatic pressure and a solidified shell possesses an impact depth shallower by 10–30 mm, level fluctuation greater by 3–15%, and more active liquid slag layer at different casting speeds than a mold without them. Moreover, the results of the hydraulic modeling with hydrostatic pressure and a solidified shell agree well with those of the numerical simulation. Therefore, the mold flow behavior modeled with hydrostatic pressure and a solidified shell is closer to the actual behavior than that obtained by models without them. The method in this paper contributes to improving the accuracy of the hydraulic modeling experiment and establishing a foundation for further study of continuous casting.
Highlights
Continuous casting, wherein molten steel is moved through a mold, is a finishing process that can improve the quality of the molten steel
Compared with the previous hydraulic models, we note that the solidified shell thickness in the continuous casting mold gradually augments with the increasing distance from the meniscus, and the corresponding solidification flux of the molten steel alters along the casting direction
To accurately represent the flow behavior in the mold, this paper established a hydraulic model of the mold that considers a solidified shell and a variation of the solidification flux by adding an extra multi-hole shell made of polymeric methyl methacrylate (PMMA) inside the hydraulic model in Figure 1
Summary
Continuous casting, wherein molten steel is moved through a mold, is a finishing process that can improve the quality of the molten steel. To simulate a solidified shell, Jin et al [15] established a hydraulic model of the slab mold that incorporated a tapered solid shell uniformly covered with small holes This model is closer to the actual continuous casting mold and has obtained results that are relatively more accurate. In view of the aforementioned deficiencies, hydraulic modeling experiments of a high-speed billet continuous casting mold considering a solidified shell and hydrostatic pressure were carried out in this paper, and attaining more accurate and faithful results. This paper mainly investigates the flow behavior in the billet mold, and the corresponding experimental results were compared with those of hydraulic modeling experiments without a solidified shell, as well as to numerical simulations, and the corresponding differences were investigated and analyzed
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