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针对Q345特宽特厚板的生产实际,建立了宽厚板坯传热数学模型,得到了在整个连铸凝固过程中铸坯任意横断面的固相率和温度分布情况。并进行了射钉试验,通过测量铸坯某位置的凝固坯壳厚度,计算出了液芯长度。对测量结果与数值模拟结果进行分析,最后得出在实际生产条件下,断面为370 mm×2 520 mm的Q345连铸坯在拉速为0.54 m/s时液芯长度是27.81 m,为连铸轻压下技术的改进提供了可靠的信息,同时也为企业探究大断面铸坯凝固末端位置提供了方法依据。
According to the actual production of Q345 extra-thick special thick slab, a mathematic model of heat transfer of wide and thick slab was established, and the solid fraction and temperature distribution of any cross section of slab during the entire continuous casting process were obtained. And the nailing test was carried out. The length of liquid core was calculated by measuring the thickness of the solidified shell at a certain position of the billet. The results of the measurement and numerical simulation are analyzed. Finally, under actual production conditions, the length of the liquid core of Q345 slab with a cross section of 370 mm × 2 520 mm at a pulling speed of 0.54 m / s is 27.81 m, The improvement of the light pressure casting technology provides reliable information, and also provides a method basis for enterprises to explore the position of the solidified end of a large section billet.