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Measurement and Calculation of Magnetic Flux Density During Mold Electromagnetic Stirring on a Continuous Casting Bloom Mold

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Abstract

In the current study, a three-dimensional measurement of the magnetic flux density was performed for a 280 mm width × 250 mm thickness continuous casting bloom mold installed with electromagnetic stirring with varied current intensity and frequency. The magnetic flux density increased gradually to a peak value and then decreased along the downward vertical direction, and it decreased in the transverse direction from the copper plate to the center of the mold. The electromagnetic field in the mold and the stirrer was calculated, and the node loading method was used to model the current input. The effect of the mesh size on calculation accuracy was investigated, and it was found that the 0.02-m cell size for the mold and the 0.001-m cell size for the coil conductor and the iron core were enough to achieve good agreement between the calculation and measurement. It was revealed that the stainless metal shell of the stirrer and the molten steel flow had little influence on the magnetic flux density. The following empirical equation was obtained to calculate the local magnetic flux density along the vertical distance:

\(B = 0.0017 \times N \times I \times f^{ - 0.9} \exp \left( { - 0.022 + 0.064 \times \left( {\frac{{L - z_{{\text{o}}} }}{{L_{{\text{o}}} /2}}} \right) - 0.42 \times \left( {\frac{{L - z_{{\text{o}}} }}{{L_{{\text{o}}} /2}}} \right)^{2} } \right),\) where B is the local magnetic flux density in mT, I is the current intensity in A, f is the current frequency in s−1, N is the number of turns of coils, L is the vertical distance away from the center of the stirrer in m, Lo is the height of the stirrer and was 0.35 m in the current study, and zo is the distance of the stirrer center below the mold top and was 0.665 m in the current study.

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Acknowledgments

The authors are grateful for support from the National Science Foundation China (Grant Nos. U1860206, 51725402 and 52104343), the Fundamental Research Funds for the Central Universities (Grant No. FRF-BD-20-04A), S&T Program of Hebei (Grant No. 20311005D), the High Steel Center (HSC) at North China University of Technology (NCUT), University of Science and Technology Beijing (USTB), and Yanshan University (YSU), China.

Conflict of interest

On behalf of all authors, the corresponding authors states that there is no conflict of interest.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB), Beijing, 100083, P.R. China

    Qilan Li

  2. School of Vehicles and Energy, Yanshan University, Qinhuangdao, 066004, Hebei, P.R. China

    Zhen Zhao & Jing Zhang

  3. School of Mechanical Engineering, Yanshan University, Qinhuangdao, 066004, Hebei, P.R. China

    Wei Chen

  4. School of Mechanical and Materials Engineering, North China University of Technology, Beijing, 100144, P.R. China

    Lifeng Zhang

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  1. Qilan Li
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  2. Zhen Zhao
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  3. Wei Chen
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Correspondence to Wei Chen, Jing Zhang or Lifeng Zhang.

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Li, Q., Zhao, Z., Chen, W. et al. Measurement and Calculation of Magnetic Flux Density During Mold Electromagnetic Stirring on a Continuous Casting Bloom Mold. Metall Mater Trans B 53, 2481–2498 (2022). https://doi.org/10.1007/s11663-022-02544-z

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