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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。
During the cooling process after the hot-rolled steel strip is rolled, since the temperature difference between the surface and the center after the quenching causes the heat inside the rolled material to transfer to the surface, the surface is reddish phenomenon. The red return to the process of experimental study, the measured rolling in the water after the surface and internal temperature changes. The finite element method was used to simulate the reddening of different rolling stock under different cooling conditions. The reason of returning red to the surface of the steel was analyzed. The critical conditions of returning to red were determined, and the temperature rise caused by redness under different conditions And return to the red time. The results showed that with the increase of the thickness and cooling rate, the temperature difference of water table increased, the temperature of red return rose and the time of red return increased.