Abstract
AbstractThe growth rate of the shell thickness in the funnel mold for ultrahigh-speed continuous casting of steel has a significant effect on the shell surface quality. By using the node temperature inheritance algorithm, a three-dimensional transient thermal conductivity model of the liquid steel solidification inside the mold was established, and the effects of casting temperature and speed on the heat transfer behavior of the thin slab were investigated. The results show that with an increase in the casting speed from 4.0 to 6.0 m·min−1, the maximum thickness of the shell at mold exit was reduced from 26 to 12.8 mm, and the maximum temperature of the slab surface at mold exit increased from 1,210 to 1,305°C. However, the increase of casting temperature from 1,550 to 1,560°C had little effect on the surface temperature and thickness of the slab shell.
Highlights
To fulfill the perfect match between the continuous casting and the rolling process, the casting speed of continuous casting is getting faster, and normally the casting speed forIn past decades, researchers have established a large number of mathematical models to analyze the heat transfer behavior of thin slabs inside the continuous casting mold
The high casting speed has a significant effect on the heat transfer and the liquid steel solidification inside the mold [4,5,6], leading to the formation of slab surface defects and even the steel breakout [7,8]
The purpose of this study is to investigate the effect of the high casting speed (>5.0 m·min−1) on the heat transfer behaviors of the flexible thin-slab casting technology (FTSC) continuous casting mold at Tangshan Iron and Steel Co., Ltd. [13]
Summary
Researchers have established a large number of mathematical models to analyze the heat transfer behavior of thin slabs inside the continuous casting mold. Nam et al [9] established a fluid flow, heat transfer, and solidification-coupled mathematical model to analyze the flow and solidification behavior of molten steel within the funnel mold. Liu et al [10] established a three-dimensional (3D) fluid flow, heat transfer, and solidification-coupled mathematical model to study the heat transfer behavior inside the mold of both compact strip production and flexible thin-slab casting technology (FTSC) processes. Few literature about the effect of the high casting speed during the full endless rolling process on the heat transfer behaviors of the continuous casting mold were reported
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