Research on Mold Electromagnetic Stirring Technologies for Bloom Continuous Casting of Heavy Rail

Metallurgical results of mold electromagnetic stirring（MEMS）in continuous casting previous employed at continuous bloom caster for heavy rail steel was not fully achieved.Therefore,experiments for optimizing process parameters of M-EMS for heavy rail steel was carried out.In order to analyze the influence of the current intensity on internal quality of heavy rail bloom,such as center looseness,central segregation and the ratio of equiaxed zone,the effects with different current intensity were investigated.On the basis,the MEMS scheme most suitable for heavy rail steel was developed,which improves internal quality of heavy rail bloom obviously.The operation shows that the area ratio of equiaxed zone is increased from 18.8% to 36.2 %,center looseness is≤1.5,central segregation and shrinkage cavity are≤1.0,meanwhile,the central segregation index of carbon is≤1.05.Internal quality and mechanical performance of the rails produced from continuously cast blooms have met the requirement of 350 km/h high-speed tracks.