高碳钢矩形坯凝固末端永磁搅拌试验  

Final permanent magnet stirring in high carbon rectangular billet continuous casting

作　　者：曾杰[1] 张森林 刘澄 陈伟庆[1] 李兵 

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 [2]岳阳通海炉窑电磁设备有限公司,湖南岳阳414000 [3]青岛钢铁集团有限公司技术中心,山东青岛266043

出　　处：《钢铁》2016年第7期22-27,共6页Iron and Steel

摘　　要：为了改善高碳钢82A断面180 mm×240 mm矩形坯内部质量,首次在凝固末端进行了永磁搅拌工业试验。根据射钉结果,确定了搅拌器安装位置为距弯月面7 m。搅拌器磁体采用液压系统驱动,通过增加永磁搅拌器入口油压来提高搅拌频率。随着搅拌频率从0增加到5 Hz,矩形坯凝固中心平均碳偏析值从1.18降到1.09。此外,永磁搅拌改善连铸坯中心疏松和缩孔效果显著,铸坯中心疏松0.5级的比例增加了40%,中心缩孔0级比例从0增加到20%。To improve the intemal quality of high carbon 82A steel, such as center carbon segregation in rectangular bil- let with the size of 180 mm - 240 ram, the final permanent magnet stirring was applied in a rectangular billet caster. Based on the pin-shooting results, the installation position of the final permanent magnet stirring was 7 m from the me- niscus. The permanent magnet was driven by a hydraulic system and the stirring frequency was increased by increasing the inlet oil pressures. Results showed that the mean center segregation degree of carbon decreased from 1.18 to 1.09 as the stirring frequency increased from 0 to 5 Hz. Besides, the implementation of new casting technology provided an es- sential improvement in other internal qualities of high carbon rectangular billets, such as the grades of center porosity and shrinkage cavity. The grade of center porosity that was less than 0.5 increased by 40% and the grade of shrinkage cavity that equaled to 0 improved from 0 to 20%.

关 键 词：永磁搅拌器 高碳钢矩形坯 入口油压 搅拌频率 中心碳偏析 

分 类 号：TF777[冶金工程—钢铁冶金]