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Time–Frequency Characteristics and Predictions of Instantaneous Abnormal Level Fluctuation in Slab Continuous Casting Mold

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Abstract

During the continuous casting process, the instantaneous abnormal mold level fluctuation has great detrimental effects on slab quality, thus the mold level fluctuation is a key parameter for continuous casting process of high-quality steel. In the present study, the slab continuous casting process data for low carbon steel, medium carbon steel, hypo-peritectic steel and peritectic steel are collected to investigate the effect of process parameter on the instantaneous abnormal mold level fluctuation. The frequency domain coherence results illustrate that the stopper-rod position is the key influence factor on the instantaneous abnormal mold level fluctuation during the continuous casting process of different steel grades. The time–frequency characteristics of instantaneous abnormal mold level fluctuation and stopper-rod position were analyzed by continuous wavelet transform (CWT), and the results show that before the instantaneous abnormal mold level fluctuation occurrence, the high-frequency region amplitude of stopper-rod position shows a linear increase trend. For the continuous casting process with constant casting speed, the increase rate is within the range of 0.1/s to 0.2/s. For the instantaneous abnormal mold level fluctuation induced by steep casting speed change, the increase rate can reach 0.67/s. For the instantaneous abnormal mold level fluctuation induced by ladle change, the increase rate can reach 0.85/s. Therefore, the instantaneous abnormal mold level fluctuation can be predicted by CWT analysis for the high-frequency region amplitude of stopper-rod position.

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Acknowledgments

The authors gratefully acknowledge the financial support of National Key Research and Development Plan (No. 2021YFB3702000) and National Natural Science of China (Nos. 52074076, 52174306 and U20A20272) and Fundamental Research Funds for the Central Universities No. N2225023.

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The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Northeastern University, Shenyang, 110819, Liaoning, China

    Xiaoliang Meng, Sen Luo, Weiling Wang & Miaoyong Zhu

  2. School of Metallurgy, Northeastern University, Shenyang, 110819, Liaoning, China

    Xiaoliang Meng, Sen Luo, Weiling Wang & Miaoyong Zhu

  3. Shanghai Meishan Iron & Steel Co., Ltd., Nanjing, 210039, Jiangsu, China

    Yelian Zhou

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  1. Xiaoliang Meng
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  2. Sen Luo
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  3. Yelian Zhou
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  4. Weiling Wang
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  5. Miaoyong Zhu
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Correspondence to Sen Luo.

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Meng, X., Luo, S., Zhou, Y. et al. Time–Frequency Characteristics and Predictions of Instantaneous Abnormal Level Fluctuation in Slab Continuous Casting Mold. Metall Mater Trans B 54, 2426–2438 (2023). https://doi.org/10.1007/s11663-023-02844-y

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  • DOI: https://doi.org/10.1007/s11663-023-02844-y

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