Metall. Res. Technol.
Volume 116, Number 6, 2019
|Number of page(s)||11|
|Published online||08 October 2019|
High-efficiency continuous casting of GCr15 bearing steel bloom based on cooperative control technique of complex electromagnetic stirring and soft reduction
National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing,
100083, PR China
2 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, PR China
3 ZENITH Steel Group Co., Ltd., Changzhou, PR China
4 Equipment Manufacturing Department, Jiangsu Automation Research Institute, Lianyungang, Jiangsu, PR China
* e-mail: email@example.com
Accepted: 11 September 2019
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.
Key words: high-efficiency bloom continuous casting / GCr15 bearing steel / center macro-segregation / complex electromagnetic stirring / soft reduction
© EDP Sciences, 2019
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