摘要
针对某钢厂40Cr大方坯连铸工艺生产条件,建立二维非稳态传热模型,利用射钉实验结果修正传热模型。传热模型计算分析结果表明,工况配水方案下,二冷一区、二冷二区回热速率偏高,铸坯出结晶器坯壳厚度较厚,结晶器冷却强度有降低空间;随距铸坯表面中心距离的增大,铸坯内温度梯度逐渐减小,到铸坯中心区域,温度梯度差异很小;随距弯月面距离的增大,铸坯表面到中心连线上某一相同位置的温度梯度先逐渐减小,后逐渐增大;随冷却强度增大,铸坯柱状晶向等轴晶转变区域温度梯度增大,但单纯增大二冷五区冷却强度,温度梯度增大效果不明显。
In light of continuous casting technological conditions for producing 40Cr steel bloom, two- dimensional unsteady heat transfer model had been established, and this model had been corrected by the pin-shooting experimental data. The results show that the regenerative rate on bloom surface in the first and second partition of secondary cooling zone is higher under the actual water distribution. The bloom shell at the outlet of mould is thicker, and the intensity of cooling for the mould can be further reduced. The temperature gradients in the bloom are reduced gradually with distance from the center of bloom surface, and the temperature gradients in the central areas of bloom vary little. The temperature gradient at the same distance from bloom surface decreases first and then increases gradually with distance from the meniscus area. With the increase of cooling intensity, the temperature gradients in columnar-to-equiaxed transition of bloom increase. The increase of temperature gradients is not obvious by only increasing the cooling intensity in the fifth partition of secondary cooling zone.
出处
《武汉科技大学学报》
CAS
2013年第4期241-245,共5页
Journal of Wuhan University of Science and Technology
关键词
连铸
40Cr
大方坯
凝固
传热行为
continuous casting
40Cr steel
bloom
solidification
heat transfer behavior
