Abstract
To reduce slag entrapment in 150 × 1270 mm slab continuous casting molds at the Tang Steel Company, the effect of submerged entrance nozzle (SEN) depth and casting speed on the phenomenon was studied by computational fluid dynamics simulations. Then, the slag entrapment behavior in continuous casting molds, utilizing Large Eddy Simulation (LES) by coupling the volume of fluid (VOF) method, was also used. Finally, the effect of several common oils usually used to simulate slag in water modelling on slag entrapment was discussed and the water modelling results were used to validate the numerical simulation findings. The results showed that the optimum scheme is a submerged depth of SEN 90 mm and a casting speed of 1.6 m/min. Under optimal conditions, the maximum surface velocity is smallest (0.335 m/s) and the maximum slag entrapment ratio (0.44%) appears in the position of 0.1 m below the meniscus after 15 s. The water modelling results were in good agreement with the numerical simulation results.
Highlights
The core concept of high efficiency continuous casting is to produce high quality defect-free steel at high casting speeds
Slag entrapment in molds seriously deteriorate the quality of steel products, becoming one of the main obstacles affecting the production of high value-added steel products [1]
Thomas et al [8] have summarized that mold slag entrainment could cause both surface and internal defects in final products if the entrained droplets become trapped in the solidifying metal, which makes it a significant problem in the production of clean steel
Summary
The core concept of high efficiency continuous casting is to produce high quality defect-free steel at high casting speeds. Iguchi et al [9] focused on the shear flow instability between molten steel flow and mold powder as one of causes for mold powder entrapment, and investigated the effect of kinematic viscosity of mold powder on the onset of entrapment. They did not explain why they chose salt water, which has a different density ratio to water. The critical flow velocity (u) for entrainment is an important (u) for entrainment is an important parameter for slag entrapment in continuous casting molds. Effectthe of effect several oils usually used toused simulate slag inslag water method, was used. the of common several common oils usually to simulate in modelling on slag entrapment was discussed and the water modelling results were used to validate water modelling on slag entrapment was discussed and the water modelling results were used to the numerical simulation findings.findings
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