Effect of continuous casting speed on mold surface flow and the related near-surface distribution of non-metallic inclusions

Peng Fei; Yi Min; Cheng-jun Liu; Mao-fa Jiang

doi:10.1007/s12613-019-1723-y

Volume 26 Issue 2

Feb. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2019 > 26(2): 186-193

Peng Fei, Yi Min, Cheng-jun Liu, and Mao-fa Jiang, Effect of continuous casting speed on mold surface flow and the related near-surface distribution of non-metallic inclusions, Int. J. Miner. Metall. Mater., 26(2019), No. 2, pp. 186-193. https://doi.org/10.1007/s12613-019-1723-y

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Peng Fei, Yi Min, Cheng-jun Liu, and Mao-fa Jiang, Effect of continuous casting speed on mold surface flow and the related near-surface distribution of non-metallic inclusions, Int. J. Miner. Metall. Mater., 26(2019), No. 2, pp. 186-193. https://doi.org/10.1007/s12613-019-1723-y

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Research Article

Effect of continuous casting speed on mold surface flow and the related near-surface distribution of non-metallic inclusions

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Corresponding author:
Yi Min E-mail: miny@smm.neu.edu.cn
Received: 22 April 2018; Revised: 13 June 2018; Accepted: 15 June 2018

Abstract

Abstract

For the control of surface defects in interstitial-free (IF) steel, quantitative metallographic analyses of near-surface inclusions and surface liquid flow detection via the nail-board tipping method were conducted. The results show that, at casting speeds of 0.8 and 1.0 m/min, a thin liquid mold flux layer forms and non-uniform floating of argon bubbles occurs, inducing the entrainment and subsequent entrapment of the liquid flux; fine inclusion particles of Al₂O₃ can also aggregate at the solidification front. At higher casting speeds of 1.4 and 1.6 m/min, the liquid mold flux can be entrained and carried deeper into the liquid steel pool because of strong level fluctuations of the liquid steel and the flux. The optimal casting speed is approximately 1.2 m/min, with the most favorable surface flow status and, correspondingly, the lowest number of inclusions near the slab surface.
- non-metallic inclusions;
- distribution;
- casting speed;
- surface flow

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References

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