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Optimization of Thermal Soft Reduction on Continuous-Casting Billet

机译：连铸坯热软压下的优化

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Thermal soft reduction (TSR) is an effective technique to improve the inner quality of continuous-casting billet, but it may lead to undesired internal and surface cracks. In this work, the technologic parameters of TSR were optimized to ensure its effect and control the cracks of 82A tire cord steel billet. A heat transfer model with comprehensive thermo-physical parameters was established to simulate the thermal behavior of continuous-casting billet. The model was verified by comparing the measured surface temperatures and the calculated ones. According to the mechanism of TSR on billet, both the location and water flow rate were comparatively optimized. TSR was determined to locate at 6.96 m–8.46 m from meniscus, where the temperature of billet center dropped rapidly to liquid impenetrable temperature. The water flow rate of TSR was set to 2.2 m~(3)/h, which allowed the reheating rate and surface temperature in a reasonable range and prevented the formation of the cracks. Plant trials were conducted to verify the effect of the optimized TSR. The results showed that the central porosity, V segregation and central segregation of the billet were obviously improved by applying TSR. Meanwhile, the internal and surface cracks were well controlled in the billet.
机译：热软压下法（TSR）是提高连续铸造坯料内部质量的有效技术，但它可能导致不希望的内部和表面裂纹。在这项工作中，优化了TSR的工艺参数以确保其效果并控制82A轮胎帘线钢坯的裂纹。建立了具有综合热物理参数的传热模型，以模拟连铸坯的热行为。通过比较测量的表面温度和计算的表面温度来验证模型。根据TSR在方坯上的作用机理，对位置和水流量进行了相对优化。 TSR被确定为位于距弯月面6.96 m–8.46 m处，在那里钢坯中心温度迅速下降至液体不可渗透的温度。将TSR的水流量设定为2.2m〜（3）/ h，可以使再加热速度和表面温度在合理范围内，并防止裂纹的形成。进行了植物试验以验证优化的TSR的效果。结果表明，采用TSR可明显改善坯料的中心孔隙率，V偏析和中心偏析。同时，钢坯内部和表面裂纹得到了很好的控制。

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