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| Optimization of solidification heat transfer and secondary cooling water distribution process for 170 mm×170 mm billet |
| FANG Ming1, ZHANG Zhaohui1, LÜ Ming1, GUO Hongmin2, LIANG Shaopeng2, LI Xintao1, GAO Qi3 |
1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China;
2. Shaanxi Longmen Iron and Steel Co., Ltd., Hancheng 715400, Shaanxi, China;
3. Department of Steelmaking, China National Heavy Machinery Research Institute Co., Ltd., Xi’an 710032, Shaanxi, China |
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Abstract In order to solve the problem of uneven distribution of cooling water in the 170 mm×170 mm billet continuous casting machine and reduce the production defects of the billet, a two-dimensional solidification heat transfer model was established to simulate the solidification heat transfer process of the billet and analyze the original secondary cooling. Combined with the target surface temperature setting, metallurgical criteria and high-temperature mechanical properties of steel, the secondary cooling process is optimized, the optimized total water volume of secondary cooling and the relationship between water volume and casting speed are proposed, and the water distribution scheme is simulated and verified. The research results show that after adopting the optimized water distribution model, the water volume in the crystallizer zone is reduced by 3% to 10%, the total water volume in the secondary cooling zone is decreased by 10% to 26%, and the cooling water distribution ratio of the foot roll zone and the secondary cooling zone is reduced. When the casting speed is 3.2 m/min and 3.8 m/min, the billet surface temperature control meets the metallurgical criteria and meets the production requirements of high-efficiency continuous casting secondary cooling water distribution. With the optimized secondary cooling water distribution model, the control accuracy and applicability of the secondary cooling water volume are further improved, and the cooling uniformity of the billet is increased, which has guiding significance for improving the quality of the billet.
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Received: 17 February 2023
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2023, Vol. 42 
