非对称式辊式搅拌在宽板坯连铸机的设计与应用  

Design and application of asymmetric in-roll EMS in wide slab caster

作　　者：张晓东[1] ZHANG Xiaodong(Shanxi Taigang Stainless Steel Co.,Ltd.,Taiyuan 030003,China)

机构地区：[1]山西太钢不锈钢股份有限公司,山西太原030003

出　　处：《重型机械》2024年第3期41-46,共6页Heavy Machinery

摘　　要：辊式搅拌是板坯连铸机的核心设备,主要用于提高铸坯等轴晶率,改善铸坯中心疏松和中心偏析,提升铸坯内部质量。对于铸坯宽度大于1 800 mm宽板坯连铸机,采用通辊式辊式搅拌经常出现辊端轴断裂和螺栓松动等故障,导致辊式搅拌使用寿命无法与连铸机正常自由辊相匹配,设备无法连续稳定运转。宽板坯连铸机上采用了非对称式辊式搅拌技术,通过对非对称式辊式搅拌辊进行建模仿真与实际磁学性能测试,验证该类型结构能达到改善铸坯中心质量所需磁场性能要求。通过改造扇形段适配非对称式辊式搅拌的安装,开展了430、0Cr13、439、409、2Cr13等不锈钢钢种的冶金试验,试验结果满足预期铸坯中心质量要求,铸坯中心等轴晶、中心疏松和中心偏析改善效果明显,改造后设备未出现辊端轴断裂和螺栓断裂问题,设备使用稳定性大幅提高,搅拌辊与自由辊寿命基本持平,满足连铸机稳定无故障运行要求。In-roll electromagnetic stirring(EMS)is one of the core equipments of slab caster,which is mainly used to improve the equiaxed crystal rate of slab,improve the center porosity and center segregation of slab,and improve the internal quality of slab.For the slab continuous casting machine with slab width exceeding 1800 mm,the roller end shaft fracture and bolt loosening often occur when using roller stirring,which leads to a mismatch between the service life of the roller-stirring and the normal free roll of the caster,and the equipment cannot operate continuously and stably.The asymmetric in-roll EMS technology is adopted in the wide slab caster.Through the modeling simulation and actual magnetic performance test of the asymmetric in-roll EMS roller,it is verified that this structure can meet the magnetic field performance requirements for improving the central quality of the slab.Metallurgical tests of stainless steel such as 430,0Cr13,439,409 and 2Cr13 were done by improving the sector section to adapt to the installation of asymmetric roller stirring.The test results meet the expected quality requirements of the slab center,the improvement effect of equiaxed crystal,center porosity and center segregation of the slab center is obvious.After the improvements,there is no roller end shaft fractures or bolt fractures in the equipment,and the equipment stability is greatly improved,the service life of the stirring roller and the free roller are basically the same,which meets the requirements of stable and trouble-free operation of the caster.

关 键 词：辊式搅拌 宽板坯连铸机 等轴晶 中心疏松 中心偏析 

分 类 号：TF777.1[冶金工程—钢铁冶金]