Numerical simulation on the solidification structure of ?600mm continuous casting round bloom

4th International Conference on Advances in Solidification Processes

材料科学;物理学

Fang, Q.^1 ; Ni, H.W.^1 ; Wang, S.J.^2 ; Zang, H.^1

Key Laboratory for Ferrous Metallurgy and Resources Utilization, Ministry of Education, Wuhan University of Science and Technology, Wuhan

430081, China^1

Chengde Jianlong Special Steel Co Ltd, Chengde

067201, China^2

关键词: Bloom continuous castings;    Casting conditions;    Casting temperatures;    Cellular automation;    Continuous casting process;    Corrosion testing;    Practical production;    Solidification structure;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/117/1/012036/pdf
DOI  :  10.1088/1757-899X/117/1/012036

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A FE (Finite Element) - CA (Cellular Automation) coupling model was developed for the simulation of solidification structure formation during the O600mm round bloom continuous casting process of Q345E steel. The simulation result of the temperature field was consistent with the nail-shooting experimental result, and the simulated solidification structure of the bloom was in great agreement with corrosion testing under the same casting condition. The simulation results showed that the centre equiaxed crystal ratio increased slightly with the increase of secondary cooling water rate and decreased with the increase of casting temperature and casting speed. When the secondary cooling water rate was over 0.08L/kg, it had less effect on the solidification structure. As the casting temperature increased by 1°C or the casting speed increased by 0.01m/min, the centre equiaxed crystal ratio would decrease by 0.4%∼1.2% and 3%∼0.8% respectively. According to the simulation results, the optimized continuous casting process of O600mm round bloom should be the secondary cooling water rate of 0.08L/kg, the casting temperature of 1532°C∼1539°C and the casting speed of 0.20m/min∼0.22m/min. It was found that the solidification structure of O600mm Q345E steel round bloom was much improved after the optimized continuous casting process was adopted in practical production.