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街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/m~2.
The copperplate temperature in different conditions and different time were collected on line using mould temperature monitoring soft of the continuous thin slab caster in Ma'anshan Iron and Steel Co.,Ltd.,and also the mould copperplate temperature change regularity was analyzed in order to obtain proper heat flux boundary conditions for solving thin slab flow,heat transfer and solidification model and references for revealing crack formation mechanism of mould copperplate and slab.According to actual cooling parameter and measured temperature of copperplate,the mould heat flux field has been calculated while producing the SPHC steel slabs whose section were1 275 mm×70 mm and 1 525 mm × 70 mm respectively at different casting speed.The results show that distribution of copperplate temperature and heat flux of the mould was similar on the same conditions.Both of them had downtrend in the longitudinal direction of mould.Their fluctuations are obvious in the transverse direction of mould especially near meniscus.While the slab whose width was 1 275 mm and 1 525 mm were cast with the same nozzle,distribution curves of copperplate temperature and heat flux of the mould on the whole presented to be"M"and"W"shape in the transverse direction respectively.In another word,the maximum value of copper temperature and the heat flux were in the quarter and centerline of copperplate broadside respectively.The maximum heat flux was 4.6MW/m~2.
参考文献
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