Influence of secondary cooling water distribution optimization on quality of titanium microalloyed casting slab
SUN Fengjie1, HUANG Weili2,3, CHEHN Wei1, WANG Xingjuan1, LI Yao1, NIU Yuewei2,3
1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063000, Hebei,China; 2. Technology Center of Delong Steel Co., Ltd., Xingtai 054009,Hebei,China; 3. Hebei Hot Rolled Strip Technology Innovation Center, Xingtai 054009,Hebei,China
Abstract：Based on the problems of center crack, triangle crack and product elongation deficiency of DL350 billet of titanium microalloy steel of Delong Company, the heat transfer model of billet was established by the optimization system of secondary cooling water distribution combined with the metallurgical limit criterion, and the optimization of secondary cooling water distribution was studied. ANSYS simulation was used to simulate the temperature of different specific water volume at 0.9-1.2 m/min. The results show that the simulation and experiment are in good agreement, and the quality of casting billet with specific water volume is improved after optimization. According to the drawing speed correlation water distribution method, the optimal specific water volume of 0.9, 1.0, 1.1, 1.2 m/min at different drawing speeds are 0.68, 0.73, 0.77, 0.80 L/kg. In production, the correctness of the simulation is also verified. From the morphology of the low magnification for billet produced after optimization, the defects of the billet great elimination, the surface and internal quality of the billet meet the needs of rolling technology, and finally the elongation of the product is improved and the production needs are met.
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2023, Vol. 42 
