The effect of current(150~500 A)of mold electromagnetic stiring(M-EMS)technology on metallurgy quality of 280 mm×380 mm
280 mm×325 nm concasting bloom of heavy rail steel U75V etc grade has been tested and studied. Results showed that with the current increasing from 250 A to 500 A
the percentage of equiaxed zone increased from 18.8% to36.2%
the total inclusion amount decreased from8.53 mg/10kg to4.68 mg/10kg and the percentage of ratting units ≤1.0 of defects centre porosity
segregation
shrinkage cavity
centre cracks and midway cracks was up to 98%.As concasting stiring current was 350~400 A for medium carbon steels and concasting stiring current was 250 A for low carbon steels
the percentage of ratting units ≤1.0 of casting bloom intemal defects was respectively up to93% and 90%.