鞍钢ASP线连铸电磁搅拌应用实践.pdfVIP

鞍钢 ASP 线连铸电磁搅拌应用实践 张 文 徐世帅 谷春阳 阎东宇 刘 威 王 健 （鞍钢股份有限公司热轧带钢厂，鞍山 114021 ） 1 摘 要 连铸坯凝固过程中，由于冷却速度很快，造成铸坯凝固时柱状晶的发展，往往产生“搭桥”现象，导致铸 坯内缩孔、偏析、疏松、夹杂物聚集等缺陷产生。由于鞍钢 ASP 连铸机铸坯厚度为 135mm，拉速可达2.9m/min， 铸坯内部缺陷较多，为解决以上问题，采用电磁搅拌装置，有利于改善连铸坯的凝固组织，从而改善铸坯表面及内 部质量。电磁搅拌的实质是借助电磁力控制铸坯液相穴中钢水的运动，强化钢水的传热，从而控制凝固过程。通过 对鞍钢 ASP 生产线连铸坯凝固组织研究，得到正常工艺下的铸坯的凝固组织、二次枝晶间距等铸态特征，并通过 应用二冷区电磁搅拌技术，使铸坯等轴晶数量增加，等轴晶区扩大，铸坯中心偏析和内裂裂纹等也得到减轻或消除。 关键词 电磁搅拌 凝固组织 二次枝晶间距 等轴晶粒 The Practice of Electromagnetic Stirring of ASP Process in An Steel Zhang Wen Xu Shishuai Gu Chunyang Yan Dongyu Liu Wei Wang Jian (The Hot Strip Mill of Angang Steel Company Limited，Anshan, 114021) Abstract In the solidification process of continuous casting strand，columnar crystal is developed due to fast cooling rate， likely to cause the phenomenon of bridging first，resulting in the defects such as porosity ，segregation，looseness，inclusion conglomeration in the slab. To resolve the above problems，the application of EMS device is not only favorable for improving the solidification structure of the casting strand, but is also an effective measure to improve the strand surface quality ．Electromagnetic stirring technology is controlling hot metal movement in liquid pool of bloom, strengthing hot metal heat transfer by electromagnetic power in order to control solidification process ．By studying of the solidification microstructure of slab produced by ASP process in An Steel, the structural features were researched in the normal process, which included the solidification microstructure, the secondary arm spacing etc. By using EMS in secondary cooling zone, the amount of the equi-axed crystals were increased, the equi-axed crystals