Improving Inner Quality in Continuous Casting Rectangular Billets: Comparison Between Mechanical Soft Reduction and Final Electromagnetic Stirring

2016 ◽  
Vol 69 (8) ◽  
pp. 1623-1632 ◽  
Author(s):  
Jie Zeng ◽  
Weiqing Chen ◽  
Qingxian Wang ◽  
Guangshun Wang
Keyword(s):  
Continuous Casting ◽  
Electromagnetic Stirring ◽  
Soft Reduction ◽  
Final Electromagnetic Stirring

Effect of Final Electromagnetic Stirring on Flow, Solidification, and Solute Transport in Continuous Casting Bloom

JOM ◽  
2021 ◽  
Author(s):  
Qing Fang ◽  
Hua Zhang ◽  
Jiahui Wang ◽  
Peng Zhao ◽  
Guoliang Wu ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Solute Transport ◽  
Electromagnetic Stirring ◽  
Final Electromagnetic Stirring

High-efficiency continuous casting of GCr15 bearing steel bloom based on cooperative control technique of complex electromagnetic stirring and soft reduction

2019 ◽  
Vol 116 (6) ◽  
pp. 621 ◽  
Author(s):  
Hanghang An ◽  
Yan Ping Bao ◽  
Min Wang ◽  
Quan Yang ◽  
Xiang Hong Wang ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Casting Speed ◽  
Bearing Steel ◽  
Average Degree ◽  
Electromagnetic Stirring ◽  
Control Technique ◽  
Internal Quality ◽  
Soft Reduction ◽  
Carbon Segregation ◽  
Gcr15 Bearing Steel

GCr15 bearing steel exhibits comparatively serious center macro-segregation in the continuous casting of bloom with the increase of casting speed. In the present work, the influence of complex electromagnetic stirring (M + F-EMS) and mechanical soft reduction (MSR) on the center macro-segregation in the continuous casting of 220 × 260 mm blooms of GCr15 bearing steel have been comparatively investigated to increase casting speed in order to ensure a good internal quality. Based on numerical simulation and experiments, M + F-EMS and MSR have been comprehensively evaluated and compared by combination of industrial trials. The results show that center carbon segregation first decreases and then increases with the increase of casting speed in both processes without optimization. For M + F-EMS process, when casting speed increases from 0.75 to 0.85 m · min−1, the average degree of center carbon segregation decreases from 1.2 ∼ 1.26 to 1.18 ∼ 1.25 by asymmetrical optimization; with regard to combination of M + F-EMS and MSR process, when casting speed increases from 0.75 to 0.9 m · min−1, the average degree of center carbon segregation decreases from 1.2 ∼ 1.26 to 1.08 ∼ 1.1 and the solute element distribution becomes homogeneous by optimization. In comparison, significant reduction of the center macro-segregation with the increase of casting speed can be achieved for combination of M + F-EMS and MSR process, however, it is infeasible for M + F-EMS process in the present technology situation.

scholarly journals Numerical Simulation of Electromagnetic Field in Round Bloom Continuous Casting with Final Electromagnetic Stirring

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 903 ◽  
Author(s):  
Bingzhi Ren ◽  
Dengfu Chen ◽  
Wentang Xia ◽  
Hongdan Wang ◽  
Zhiwei Han
Keyword(s):  
Electromagnetic Field ◽  
Continuous Casting ◽  
Electromagnetic Force ◽  
Measured Data ◽  
Electromagnetic Stirring ◽  
Magnetic Flux Density ◽  
Force Density ◽  
Secondary Cooling ◽  
Current Frequency ◽  
Final Electromagnetic Stirring

A 3D mathematical model was developed to simulate the electromagnetic field in Φ600 mm round bloom continuous casting with final electromagnetic stirring (F-EMS), and the model was verified using measured data for the magnetic flux density in the stirrer centre. The distribution of electromagnetic force and the influence of current intensity and frequency were investigated. The results show that the Joule heat generated by F-EMS is very small and its influence on secondary cooling heat transfer in the stirring zone can be ignored. With an increase in current frequency, the electromagnetic force density at R/2 and R/3 of the Φ600 mm round bloom first increases and then decreases, reaching a maximum at 10 Hz.

scholarly journals Coordinated Optimal Control of Secondary Cooling and Final Electromagnetic Stirring for Continuous Casting Billets

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Dongsheng Wu ◽  
Zhenping Ji ◽  
Jian Yang ◽  
Hongwei Gao ◽  
Jiahui Yu ◽  
...  
Keyword(s):  
Optimal Control ◽  
Particle Swarm Optimization ◽  
Continuous Casting ◽  
Particle Swarm ◽  
Electromagnetic Stirring ◽  
Internal Quality ◽  
Secondary Cooling ◽  
Swarm Optimization ◽  
Multiobjective Particle Swarm Optimization ◽  
Final Electromagnetic Stirring

Secondary cooling and final electromagnetic stirring (F-EMS) are both key technologies for continuous casting. These parameters are usually optimized and controlled separately which caused internal quality fluctuations in unsteady conditions. In this paper, a coordinated optimal control strategy based on a multiobjective particle swarm optimization (MOPSO) algorithm is proposed for the parameter optimization of secondary cooling and F-EMS, which is solved based on multiobjective particle swarm optimization (MOPSO) algorithm. The solidification and heat transfer model are developed for the computation of billet temperature and the solidification, and the adaptive grid method is used to improve the diversity and robustness of optimal solutions. The secondary cooling water and F-EMS’ stirring current are dynamically controlled based on the optimization results. The results of field trials showed that the maximum carbon segregation and other quality indexes of billets can be improved significantly.

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