Abstract
AbstractIn this study, the parameters of 44 sticker breakout samples were analysed. The research mainly focused on the steel grades and slab thickness of stickers. Other processing parameters, such as slab width, casting speed, mould fluctuation, heat flux and operation, were also discussed. The results show that the number of stickers of low carbon steel and low alloy steel was 16 and 28, respectively. The stickers of low carbon steel were less than those of low alloy steel regardless of the thickness and width. The ratio of stickers per 1,000 casting heats of 220, 260 and 320 mm thickness slabs was 2.5, 0.5 and 0.6, respectively. The higher casting speed of 220 mm thickness slabs made the casting status unsteady and caused more stickers. From the perspective of width, the stickers were gradually increased along with the increase in width due to the worse mould slag. This study provides a foundation to reduce slab stickers and is helpful for a more efficient technology of continuous casting.
Highlights
Breakout is a serious accident during continuous casting
If the causes of sticker breakout could be found before its formation, the stickers would be eliminated at the beginning
The heat flux of the narrow face is supposed to be lower than that of the wide face, which is about 70–90% of that of the wide face [19]
Summary
Breakout is a serious accident during continuous casting. In order to avoid breakout, some metallurgical researchers carried out many meaningful studies. BOPS could prevent breakout by reducing casting speed, this operation decreased the slab quality due to the decrease in casting speed. Some influence parameters, such as pouring temperature, mould slag, casting speed, mould fluctuation and heat flux, were investigated [11,12,13,14,15]. Steel grades, slab thickness and operation have not been studied, which are the important influence parameters to sticker breakout. The main casting parameters of sticker breakout were investigated, such as steel grade, slab thickness, slab width, casting speed and mould fluctuation. The research results can provide a foundation to prevent sticker breakout
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