摘要
建立凝固模型并结合射钉试验对模型进行验证,通过理论分析研究了不同拉速和过热度对铸坯凝固过程的影响。理论上证明了试验铸机Φ150 mm断面拉速提高至2.7m/min的可行性。通过优化结晶器冷却、结晶器电磁搅拌以及二冷工艺的参数,将实际拉速提高至2.7m/min后,获得了表面质量和内部质量良好的圆坯,满足计划要求。同时结果也表明,中间包钢液过热度及二冷冷却不均容易造成铸坯中心缩孔以及中间裂纹等铸坯质量不稳定的问题。
The mathmatical model of solidification was established and verified by nail shooting tests. Through the theoretical analysis,the different effects of casting speed and the superheat on solidification process were analyzed,which proved that casting speeding increasing to 2.7 m/min is feasible for the experimental casting machine with Φ150 mm section. By optimizing the parameters of the cooling in mold,the mold electromagnetic stirring and second cooling process,the casting speed was increased to 2.7 m/min,and the surface quality and internal quality of the billets were improved,thus meeting the requirements of production. The results also showed that the high superheat of melton steel in tundish and asymmetry of second cooling had caused a series of problems such as internal cracks and central shrinkage.
出处
《连铸》
2017年第1期1-7,共7页
Continuous Casting
关键词
射钉试验
凝固传热模型
二冷优化
结晶器电磁搅拌
低倍质量
nail test
solidification and heat transfer model
second colding optimization
mold electromagnetic stirring
macrostructure quality
