150mm×150mm方坯连铸机末端电磁搅拌及拉速对铸坯内部质量的影响  

Influence of F-EMS Parameters and Casting Speed on the Inner Quality of 150 mm×150 mm Continuous-Casting Billet

作　　者：王涛[1,2] 张炯明[1,2] 赵新凯[1,2] 

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 [2]北京科技大学冶金与生态工程学院

出　　处：《连铸》2014年第6期50-55,共6页Continuous Casting

摘　　要：某钢厂生产的150 mm×150 mm小方坯铸坯质量不稳定,主要问题在于铸坯中心碳偏析及横截面低倍不合格率较高。因此在该连铸机上采用末端电磁搅拌设备并进行现场试验。探讨了不同搅拌位置、搅拌频率、电流大小、搅拌方式及铸机拉速对铸坯质量的影响。实验结果表明,在液芯厚度分别为35、60 mm处进行电磁搅拌均会导致中心偏析严重。电磁搅拌频率、电流大小、搅拌方式、拉速也会对铸坯内部质量产生影响。根据实验结果,在该连铸机生产工况下,最佳末搅位置在液芯厚度45 mm处,较为合理的搅拌参数为电流400 A、频率12 Hz、交替搅拌方式。拉速提高不利于铸坯内部质量。The quality of 150 mm × 150 mm billet produced by a domestic plant was not stable. The main problem was the high percent defective of central carbon segregation and inner defects. Therefore, experiments were conducted on this continuous- casting machine with F- EMS. It researched the influence of stirring position, frequency, current, stirring modes of FEMS and casting speed on the inner quality of billet. It concluded that stirring at the position where the thickness of liquid core is 35 mm or 60 mm would cause the center segregation more serious. The frequency, current, stirring modes of F-EMS and casting speed could have effect on the inner quality of billet. According to the result of the experiments, the optimal stirring position is where the thickness of liquid core is 45 mm, the optimal stirring parameters are 400 A, 12 Hz and alternating electromagnetic stirring under this working condition. The increasing of casting speed would make against the improving of inner quality of billet.

关 键 词：连铸方坯 末端电磁搅拌 拉速 内部质量 

分 类 号：TF777[冶金工程—钢铁冶金]