热轧板带钢轧后冷却过程中，由于骤冷后表面与中心的温差导致轧件内部的热量传向表面，出现表面返红现象。对返红过程进行实验研究，实测了轧件在水冷后表层和内部温度的变化。用有限元法对不同规格轧件经历不同冷却条件下的返红情况进行模拟，分析钢板表面返红的原因，确定了发生返红的临界条件，得到了不同条件下返红引起的温升量和返红时间。结果表明，随着厚度和冷却速度的增大，水冷后心表温差增加，返红温升量增大，返红时间也增加。
Temperature difference between the center and the surface of hot rolled flat after rapid cooling results in heat transfer from the center to the surface, which causes the surface temperature rise in a short time. The flat cooling experiment has been carried out to measure temperature changing on the surface and interior of flat during water cooling process and after that. FEM has been used for simulating temperature rise phenomenon for different thickness under various cooling conditions. The cause of temperature rise has been analyzed, critical condition for the occurrence of temperature rise has been confirmed, and the duration of temperature rise and the value of temperature rise under various conditions have been obtained. The results indicate that both the duration and the value of temperature rise increase with the increment of temperature difference between center and surface caused by the increase of thickness and cooling rate.
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