The thickness of the solidified shell at different casting speeds was measured by the nail-shooting method.The solidification heat transfer model of the round billet was established and the growth curve of the solid shell was calculated.Based on the results of the nail-shooting experiment and the mathematical model

the optimized installation position of the final electromagnetic stirring（F-EMS）should be located at 10.23 mfrom the mold level.In consideration of plant conditions for the continuous casting of SWRH82 Bhigh carbon steel

the FEMS installation position was moved from 11.1 mto 9.75 mfrom the meniscus.The results show that after the process parameters optimization

the equiaxed crystal ratio in SWRH82 Bround billet is increased from 40%～46% before optimization to 50%～64%

and the central carbon segregation index is decreased from 1.08～1.10 before optimization to 1.04～1.06.The quality of continuous casting round billets has been improved significantly.Through tracking the quality of the rolled sheet

it is found that the network carbide in the SWRH82 Bwire rod is reduced

which indicates that the quality of the rolled sheet is improved greatly.