Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD

Duan Fuchun; Wang Yuping; Zhu Zhiqiang

doi:10.20057/j.1003-8620.2024-00161

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Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD

Application and Service | 更新时间：2025-05-09

- Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD
- Special Steel Vol. 46, Issue 1, Pages: 126-133(2025)
- 作者机构：
  
  1.鞍钢集团本钢板材炼钢厂，本溪 117000
  2.ABB（中国）有限公司，北京 100015
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2024-00161
  CLC： TF777
- Received：24 June 2024，
  
  Published：30 January 2025
- 稿件说明：
移动端阅览
段富春,王玉平,朱志强.第三代FC结晶器控流装置的电磁参数优化[J].特殊钢,2025,46(01):126-133.

Duan Fuchun,Wang Yuping,Zhu Zhiqiang.Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD[J].Special Steel,2025,46(01):126-133.
段富春,王玉平,朱志强.第三代FC结晶器控流装置的电磁参数优化[J].特殊钢,2025,46(01):126-133. DOI： 10.20057/j.1003-8620.2024-00161.

Duan Fuchun,Wang Yuping,Zhu Zhiqiang.Optimization of Electromagnetic Parameters for the 3rd-generation FC MOLD[J].Special Steel,2025,46(01):126-133. DOI： 10.20057/j.1003-8620.2024-00161.

摘要

本钢炼钢厂8号连铸机配置了第三代FC 结晶器控流装置（以下简称FC MOLD G3）。为了减少板坯夹杂物，该钢厂利用结晶器液面波动标准差对结晶器的液面波动幅度进行评估，利用钉板试验检测结晶器钢液面的流动速度，通过工业化试验，优化了FC MOLD G3的运行参数。优化后，搅拌+制动的复合模式的参数为上线圈直流电为68%满载电流，上线圈交流电为26%满载电流，下线圈直流电为48%满载电流；高拉速的制动模式的参数为上线圈直流电为72%满载电流，上线圈交流电为12%满载电流，下线圈直流电为100%满载电流；宽断面的搅拌模式的参数为上线圈直流电为20%满载电流，上线圈交流电为25%满载电流，下线圈直流电为0 A。结果表明，与不投用FC MOLD G3相比，结晶器液面波动下降了30%～35%，在搅拌+制动的复合模式下，结晶器液位控制在±3 mm的比例超过95%，结晶器弯月面钢液表面流速在0.2～0.4 m/s的合理区间的比例达到80%。而且表面流速标准差也出现了不同程度的下降：标准的搅拌+制动模式时下降了64.1%，高拉速的制动模式时下降了12.8%，宽断面的搅拌模式时下降了40%。电镜扫描的结果显示，铸坯表层10 μm以上的夹杂物的数量密度下降了26%。生产实践表明，由夹杂物缺陷导致的冷轧卷降级率也下降了25%～30%。

Abstract

The No.8 caster of Benxi Steelmaking Plant is equipped with the 3

Flow Control Mold （ hereafter abbreviated as FC MOLD G3）. In order to reduce inclusions in slabs， the steel plant used the standard deviation of liquid level fluctuation in the mold to evaluate the amplitude of liquid level fluctuation， and used nail board test to detect the flow velocity of liquid level. Through industrial experiments， the operating parameters of FC MOLD G3 were optimized. After optimization， the parameters of the combined mode of stirring and braking are： upper DC current is 68% full current of upper coil， upper AC current is 26% full current of upper coil， and lower DC current is 48% full current of lower coil. The parameters for the high-speed braking mode are： upper DC current is 72% full current of upper coil， upper AC current is 12% full current of upper coil， and lower DC current is 100% full current of

lower coil. The parameters for the wide section stirring mode are： upper DC current is 20% full current of upper coil， upper AC current is 25% full current of upper coil， and lower DC current is 0 A. The results showed that compared with not using FC MOLD G3， the liquid level fluctuation in mold decreased by 30%-35%. In the compound mode of stirring and braking， the precision of liquid level was controlled within ± 3 mm， exceeding 95%. The reasonable range of surface flow velocity of molten steel in the mold reached 80% in the range of 0.2 m/s-0.4 m/s. Moreover， the standard deviation of surface flow velocity in the mold decreased individually： it decreased by 64.1% in the standard stirring+braking mode， and it decreased by 12.8% in the high speed braking mode， and it decreased by 40% in the wide-section stirring mode.The results of the EM scan showed a 26% decrease in the number density of inclusions above 10 μ m in the surface layer of the slab. Industrial production practice shows that the degradation rate of cold rolled coil caused by inclusion defects also decreased by 25%-30%.

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