| Electromagnetic stirring technology has been applied in iron and steel industry for more than30years. Casting practice has proved that the role of electromagnetic stirring have been widely recognized in improving the quality of continuous casting billet. Electromagnetic stirring can expand continuous casting process conditions, improve the quality of casting billet, such as increasing equiaxial crystal, lower porosity, segregation, etc., Electromagnetic stirring of continuous casting－EMS has become the important means to control solidified structure and to improve the slab quality.Many steel mills have adopted mold electromagnetic stirring. But a single part of mixing is limited to improve casting quality, especially for the center segregation problem of alloy steel and the heavy rail steel cannot be solved, so the combination of electromagnetic stirring technology is used more and more widely. Increasing the end electromagnetic stirring can further improve composition segregation and loose index, effectively improve central segregation. It is very significant in the production of high quality steel.This topic comes from1#and2#caster equipment renovation project about changing square billet to round billet continuous casting equipment, and adding solidification end electromagnetic stirring equipment on Five strand round billet caster in Baogang Group. The end electromagnetic stirrer of the round billet continuous casting will be studied to get temperature field and the magnetic field by using the method of numerical simulation with Ansys-finite element analysis software, and test the effect of electromagnetic parameters on casting quality by production.Firstly the installation position of solidification end electromagnetic stirring was determined by temperature field analysis:final electrical magnetic stirrer of1#continuous caster was installed in12.0m away from meniscus, namely within the scope from11.6to12.4m, final electrical magnetic stirrer of2#continuous caster was installed in13.0m away from meniscus, namely in the range of12.6to13.2m.Then the transient magnetic field was analyzed to get internal magnetic induction intensity and the distribution of the electromagnetic force in the process of solidification of round billet with the final electromagnetic stirring, to study the influence law of the electromagnetic parameters on slab internal magnetic field intensity, to optimize solidification end stirring process parameters of Φ430mm round billet from1#caster and Φ300mm from2#caster round billet. The field test of the magnetic field under no load obtained the measured value close to calculated value.Finally, production test for1#and2#round billet solidification end electromagnetic stirring showed that casting isometric zone increased10-20%, Center loose reduced0.5~1grade, center segregation index lowered to1.10, and the shrinkage cavity defects are reduced after installing end electromagnetic stirring. Thereby It was proved that the stirring location and electromagnetic stirring process is reasonable and The purpose of equipment modification were reached. |
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