二冷区辊式电磁搅拌在包钢板坯连铸机的应用

Application of Roll-Type Electromagnetic Stirring in Secondary Cooling Zone of Slab Caster at Baotou Iron and Steel Corp

叙述辊式二冷区电磁搅拌(400 A,1～16 Hz)在包钢Q345B、Q550D、Q345E钢(200～300)mm×(1 200～2 300)mm板坯连铸机上的应用效果。生产实践表明,当连铸工艺相同时,采用电磁搅拌工艺后,板坯的内部质量得到了显著改善,中心等轴晶率由平均9.7%增加到30.3%,中心碳偏析指数由1.17降到1.01,A类中心偏析所占的比率由平均5.1%降到0.6%。

Application effect of roll-type electromagnetic stirring（400 A,1～16Hz） in secondary cooling zone of （200～300） mm×（1200～2300） mm slab caster for steel Q345B,Q550D and Q345E at Baotou Steel is presented.Production practice results show that with same continuous casting process the internal quality of casting slab is improved obviously by using final electromagnetic stirring process,i.e.the average central equiaxial crystal ratio increases to 30.3% from original 9.7%,the central carbon segregation index reduces to 1.01 from 1.17 and the average A-type central segregation ratio decreases to 0.6%from 5.1%.