Effect of copper plate thickness on heat transfer behavior in thin slab continuous casting mold
MA Shuo1, LUO Yan-zhao2, ZHANG Cong-cong2, WANG Hao1, WANG Sheng-dong1, JI Chen-xi2
1. Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China; 2. Research Institute of Technology, Shougang Group Co., Ltd., Beijing 100043, China
Abstract：Based on the actual production data of thin slab continuous casting production line, the influence of copper plate thickness on the mold heat flux density and production stability was studied. The results showed that as the copper plate thickness decreased from 44.2 mm to 39.2 mm, the mold heat flux density increased from 2.65 MW/m2 to 2.82 MW/m2, and the mold “cold tooth” index increased from 0.4 to 17.5, greatly affecting production stability. In order to improve heat transfer stability and solve the problem of increasing mold heat flux due to the thinning of copper plate thickness, the cooling water volume of the mold was optimized and the relationship between copper plate thickness and cooling water flow rate was established. The thickness of the mold copper plate was reduced from 45 mm to 39 mm, and the cooling water flow rate was reduced from 8 500 L/min to 7 225 L/min. When producing low-carbon steel at a casting speed of 5.3 m/min, the mold wide surface heat flux can be stably controlled between 2.7 MW/m2 and 2.8 MW/m2. At the same time, the minimum flow rate of cooling water is 11 m/s, which can still make the copper plate and cooling water in a forced convection state, ensuring the service life of the copper plate. The “cold tooth” index of the mold is reduced from 3.85 to 0.73, effectively improving the quality of the casting slabs and production stability.
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MA Shuo, LUO Yan-zhao, ZHANG Cong-cong, WANG Hao, WANG Sheng-dong, JI Chen-xi. Effect of copper plate thickness on heat transfer behavior in thin slab continuous casting mold. CONTINUOUS CASTING, 2023, 42(3): 42-46.
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2023, Vol. 42 
