Effects of M-EMS Stirring Intensity on Homogeneity and Dendritic Structure of Rail Steel

Comparison experiments were carried out to find out the effects of M-EMS stirring intensity on the homogeneity of rail steel.The results show that homogeneity of bloom which produced without stirring is the best,the range value of carbon segregation degree is 0.13～0.20,the mean square deviation of carbon segregation degree is 0.027～0.048,the range value of manganese segregation degree is 0.04～0.06,the mean square deviation of manganese segregation degree is 0.012～0.014,the alternation of negative and positive segregation is non obvious,the maximum positive segregation area mainly gathered at center area,and columnar crystal is well developed,ratio of equiaxial crystal in bloom is higher which produced with strong stirring intensity(380×10^-4 T) ,the size of grain is small,the alternation of negative and positive segregation is obvious.The range value of carbon segregation degree in railhead which rolled from bloom that produced with strong stirring intensity(380×10^-4 T) is 0.08,and weak stirring intensity(220×10^-4 T) is 0.05,but non-stirring is 0.03 and it’s the best.The value of positive segregation degree for carbon in rail web which rolled from bloom that produced with strong stirring intensity(380×10^-4 T) is 1.01～1.03 and it’s the best,but weak stirring intensity(220×10^-4 T) is 1.03～1.05,and non-stirring is 1.02～1.06.Based the results,made suggestion to cancel M-EMS and equip F（S）-EMS combine with soft reduction to improve the homogeneity of rail steel,also spotting the install potion of F（S）-EMS by calculate where distance from the liquid steel level in mold is 5.0～6.0 m.