基于强冷策略的连铸小方坯二冷纵-横均匀冷却研究  

Research on Vertical and Horizontal Uniform Cooling for Small Square Billets Based on Continuous Casting Strong Cooling in Secondary Cooling Zones

作　　者：刘少伟 韩延申 文艳梅 刘青 

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083

出　　处：《铸造技术》2017年第11期2693-2697,共5页Foundry Technology

基　　金：江苏省"双创"计划资助项目(2016);扬州市"绿扬金凤计划"资助项目(2015)

摘　　要：以国内某钢厂ML40Cr钢连铸小方坯为研究对象,考虑凝固过程中结晶器气隙的形成,建立了连铸小方坯二维凝固传热模型。在避开钢的第三脆性温度区(674~814℃)与二冷强冷的前提下,将二冷比水量由0.89 L/kg增加到1.29 L/kg,二冷区2段铸坯表面喷淋水覆盖率调整为90%。结果表明,配水优化后,矫直点处连铸坯角部温度为802℃,处于钢的脆性温度区,最大回温速率较大,为122℃/m;调整喷淋水覆盖率后,矫直点处连铸坯角部温度为821℃,避开了钢的脆性温度区,最大回温速率为80℃/m,且角部温度升高了136℃,改善了角部过冷问题,较好地实现了连铸坯纵-横均匀冷却。The billet of ML40Cr steel continuous casting in a domestic steel plant was studied. Considering the formation of air gap in mold, the solidification and heat transfer model for continuous casting billet was established. Under the premise of strong cooling and avoiding the brittle temperature zone, the specific water ratio in secondary cooling zone was increased from 0.89 L/kg to 1.29 L/kg and the spray water coverage ratio of billet surface was adjusted to 90% in the second segment of secondary cooling zone. The results show that the comer temperature of the continuous casting billet at the straightening point is 802 ℃, which is in the brittle temperature zone; and the maximum temperature rise rate is 122 ℃/m. After adjusting the spray water coverage ratio, the comer temperature of the continuous casting billet at the straightening point is 821 ℃ avoiding the brittle temperature zone;and the maximum temperature rise rate is 80℃/m. The comer temperature is increased by 136 ~C, which improves the problem of excessive cooling of the comer. The vertical and horizontal uniform cooling of the continuous casting billet is achieved.

关 键 词：ML40Cr 二冷强冷 喷淋水覆盖率 纵-横均匀冷却 

分 类 号：TF777.3[冶金工程—钢铁冶金]