A new method to determine the theoretical reduction amount for wide-thick slab during the mechanical reduction process
J. Min. Metall. Sect. B-Metall., 57 (1) (2021) 125-136 DOI:10.2298/JMMB200622010W
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Available online 21 January 2021
(Received 22 June 2020; Accepted 05 January 2021)
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Abstract
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.
Keywords: Theoretical reduction amount; Mechanical soft reduction; Continuous casting; Wide-thick slab; Non-uniform solidification
Correspondence Address:
C.-H. Wu,
Pangang Group Research Institute Co., Ltd., Panzhihua, Sichuan, China ,
email: wch_neu@126.com
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