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建立了连铸板坯凝固传热与自由线收缩计算模型。揭示了不锈钢板坯连铸凝固与冷却过程线收缩的一般规律,为铸机基础辊缝锥度曲线的设计提供了合理依据。针对304不锈钢板坯连铸,结合实际生产冷却条件的计算分析表明:连铸过程板坯厚度的自由线收缩在二冷初期较为平缓,二冷后期铸坯凝固末端附近为快速线收缩阶段;目标表面温度下,拉速对板坯厚度线收缩量与线收缩率差异影响显著;板坯断面厚度影响次之,浇铸过热度影响不明显。此外,板坯厚度的线收缩沿宽向分布并不均匀,其中角部附近的线收缩量最大,不同部位的线收缩范围构成了该钢种连铸的辊缝设定操作窗口。
The calculation model of solidification heat transfer and free line shrinkage of continuous casting slab was established. The general rule of line shrinkage in the process of solidification and cooling of stainless steel slab continuous casting is revealed, which provides a reasonable basis for the design of taper curve of roll gap of the foundry foundation. According to the calculation and analysis of 304 stainless steel slab continuous casting and actual production cooling conditions, the free line shrinkage of the slab thickness in the continuous casting process is relatively flat during the initial stage of the second cooling and the rapid contraction stage near the solidification end of the second cooling stage; At the surface temperature, the pulling speed has a significant effect on the difference between the shrinkage of the thickness of the slab and the linear shrinkage rate; the thickness of the slab has the second largest effect, and the influence of the casting superheat is insignificant. In addition, the linear shrinkage of the slab thickness distribution is not uniform along the width direction, in which the maximum shrinkage of the line near the corner, the line contraction range of different parts constitute the roll gap setting operation window of the continuous casting of the steel.