A new method for determination of the theoretical reduction amount for wide-thick slab during the mechanical reduction process

• Published in: Journal of mining and metallurgy. Section B, Metallurgy Metallurgy, 2021, Vol.57 (1), p.125-136
• Main Authors: Wu, C.-H., Zeng, J.-H., Wu, G.-R., Xie, X., Zhang, M.
• Format: Article
• Language: English
• Subjects: Continuous casting; Efficiency; Heat transfer; Influence; Infrared cameras; Iron and steel making; Mathematical models; mechanical soft reduction; non-uniform solidification; Reduction; Slab casting; Solidification; Temperature distribution; theoretical reduction amount; Thickness measurement; Two dimensional models; wide-thick slab
• ISSN: 1450-5339; 2217-7175
• DOI: 10.2298/JMMB200622010W

Mechanical soft reduction (MSR) is an effective method for elimination of the centerline segregation and porosity of the continuous casting steel slab, and the reduction amount is a key parameter that determines whether the MSR could be applied successfully. In the present work, a 2D heat transfer model was developed for predicting the non-uniform solidification of the wide-thick slab. The measured shell thickness by nail shooting experiment and the measured slab surface temperature by infrared camera were applied to validate the 2D heat transfer model. A new calculation method of theoretical reduction amount that could consider the influence of non-uniform solidification of the wide-thick slab was then derived. Based on the predicted temperature field by the 2D heat transfer model and the newly-proposed calculation method, the required theoretical reduction amount and reduction gradient/rate for the wide-thick slab were calculated and discussed. The difference between the newly-proposed method and the previous method, the influence of the casting speed and slab thickness on the required theoretical reduction amount and reduction gradient/rate were also investigated.