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在实测铸坯表面温度的基础上,通过对各冷却段界面换热系数进行修正,建立了适合实际工况条件的凝固传热数学模型,并将模型计算结果应用于静态轻压下试验中,取得了良好的效果。研究结果表明:实施轻压下最佳的工艺条件为:过热度10～30℃、二冷比水量0.28 L/kg、拉速0.85 m/min,压下量8 mm;采用轻压下技术后,铸坯的中心疏松级别由原来的2.0～2.5级降低为1.0～1.5级;V型偏析和中心缩孔有所改善;铸坯的中心平均碳偏析指数由1.17～1.26降低为1.07～1.13。
Based on the measured surface temperature of the slab, the heat transfer coefficient of each cooling section was modified to establish the mathematical model of solidification and heat transfer which is suitable for the actual working conditions. The calculation results of the model were applied to the test of static soft reduction. got a good result. The results show that the optimum conditions of soft reduction are as follows: superheat 10 ~ 30 ℃, second cooling specific water 0.28 L / kg, casting speed 0.85 m / min, reduction 8 mm; , The slab center loose level from the original 2.0 to 2.5 to 1.0 to 1.5; V segregation and shrinkage of the center has been improved; the center of the slab average carbon segregation index decreased from 1.17 to 1.26 to 1.07 to 1.13.