| MATERIALS AND SUSTAINABLE DEVELOPMENT:GREEN MANUFACTURING AND PROCESSING OF MATERIALS |
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| Simulation of Heat Transfer Process and Optimization of Water Distribution Process in Continuous Casting of Nitrogen-alloyed HRB500E Steel |
| WU Guangliang1, WU Shangwen1, ZHANG Yongji1, MENG Zhengbing2
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1 School of Minerals Processing and Bioengineering, Central South University, Changsha 410083;
2 College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004 |
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Abstract Amathematical model for solidification heat transfer of HRB500E continuous casting billet with nitrogen alloying was established, and differen-tial equation of heat transfer was solved by finite difference method. The numerical simulation and calculation upon solidification heat transfer of the billet were conducted by Matlab software. In addition, the irrationality of the original cooling system was analyzed, and the optimization was carried out based on the relevant metallurgical criteria. By applying regression analysis, the dynamic relation for the water distribution among each cooling zone after optimization was determined. The research showed that the original water distribution scheme involves excessive cooling intensity, which makes the billets prone to cracking and porosity. And the optimized water distribution scheme have a cooling water flow for crystallizer lowered by 15%—20%, a cooling water flow for 0 and 1 sections lowered by 4%—15%, and a cooling water flow for 2 and 3 sections lowered by 30%—55%, compared to the original scheme. The practical casting guided by the optimized cooling scheme was carried out, and the considerably improved quality of the resultant billet validated the effectiveness of the model and the reliability of the optimization method: no crack was observed at the corner, the edge and the center of the billets, and the segregation and porosity were within 1.5 grades. The dynamic water distribution formula agreed well with the cooling water meter, which is instructive to the continuous casting of nitrogen-alloyed HRB500E.
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Published: 12 March 2019
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2019, Vol. 33 
