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Control of mould level fluctuation through the modification of steel composition

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Abstract

Periodic mould level fluctuation (MLF) during slab casting is a bottleneck for upgrading the surface quality and casting speed especially for hypoperitectic (HP) or ultralow carbon steels. The uneven growth of the initially solidified shell is verified to be one of the important inducements to MLF due to related unsteady bulging in the secondary cooling zone. It is shown that the solidification mode of steels and the contraction behavior can be modified through chemical composition optimization within given composition limits. For high strength low alloy (HSLA) steels, the actual peritectic points calculated by Thermo-Calc software may change remarkably with the slight variations of alloying element contents. Accordingly, the narrow limit of chemical composition of HP steels through optimization is proven to be one of the effective factors to control the popular MLF phenomenon during slab casting.

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Abbreviations

C A :

Maximal carbon content of ultralow carbon steel, wt%

C B :

Maximal solubility of carbon in high-temperature ferrite, wt%

C C :

Carbon content on the peritectic point, wt%

C D :

Minimal carbon content of high carbon steel, wt%

C B-w[C] and C C-w[C]:

Peritectic characteristic point and actual carbon point, respectively

T P :

Peritectic reaction temperature

w[X]:

Element X content of actual steel, X=C, Al, Mn, Si, Ni, Mo, V, and Cr

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Yang Li, Xiao-huan Zhang, Peng Lan & Jia-quan Zhang

Authors
  1. Yang Li
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  2. Xiao-huan Zhang
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  3. Peng Lan
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  4. Jia-quan Zhang
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Correspondence to Yang Li.

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Li, Y., Zhang, Xh., Lan, P. et al. Control of mould level fluctuation through the modification of steel composition. Int J Miner Metall Mater 20, 138–145 (2013). https://doi.org/10.1007/s12613-013-0705-8

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  • DOI: https://doi.org/10.1007/s12613-013-0705-8

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