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为了获得求解薄板坯流动、传热凝固模型的合理热流边界条件,并为揭示结晶器铜板及铸坯裂纹的形成机理提供参考依据,应用马钢薄板坯连铸机中结晶器温度监测软件在线采集了不同工况和不同时刻的铜板温度,分析了结晶器铜板温度的变化规律;在此基础上,结合实际冷却参数和铜板实测温度,计算了在不同拉速下浇注断面分别为1 275 mm×70 mm和1 525 mm×70 mm的SPHC钢种时的结晶器热流场。结果表明,相同条件下结晶器铜板温度和热流密度的分布具有相似的规律性,它们在结晶器纵向上呈逐渐下降趋势,而在横向上也存在明显的波动,靠近弯月面时这种波动尤为剧烈;采用相同水口和结晶器浇注宽度分别为1 275 mm和1 525 mm的铸坯时,结晶器铜板温度和热流密度在宽度方向上的分布总体上分别呈现为“M”和“W”形状,即铜板温度及热流密度的最高值分别位于铜板宽度方向的1/4处和中心线部位;拉速为4.5 m/min时,结晶器铜板最大热流密度可达到4.6MW/m2。
In order to obtain the reasonable heat flow boundary conditions of thin slab flow and heat transfer solidification model, and to provide a reference for revealing the formation mechanism of mold copper and slab cracks, the application of mold temperature monitoring software in Magang thin slab caster According to the actual cooling parameters and the actual measured temperature of the copper plate, the pouring section under different casting speeds were calculated to be 1 275 mm × 70 mm and 1 525 mm × 70 mm SPHC steel when the mold heat flow field. The results show that under the same conditions, the distribution of temperature and heat flux of copper mold have similar regularity. They show a gradual downward trend in the longitudinal direction of the mold, but also obvious fluctuations in the transverse direction. When the temperature is close to the meniscus, Especially when the castings with widths of 1 275 mm and 1 525 mm were cast by the same nozzle and mold, respectively. The distribution of the temperature and the heat flux density in the width direction of the mold copper plate showed “M” and “ ”W" shape, that is, the maximum copper temperature and heat flux density are located in the width of the copper plate and the center line of the location of the line; pulling speed of 4.5 m / min, the maximum copper mold heat flux can reach 4.6MW / m2.