Method for improving internal structure of heavy rail steel by adopting combined electromagnetic stirring

The invention discloses a method for improving the internal structure of heavy rail steel by adopting combined electromagnetic stirring, which comprises the following steps: 1) a square billet continuous casting machine adopts combined stirring of a crystallizer and a solidification tail end, and the electromagnetic stirring parameter of the crystallizer is 580A/1.8 Hz; (2) under the conditions that the section is 280 mm * 380 mm and the pulling speed and the superheat degree are the same, the current of a crystallizer is 580 A and 1.8 HZ, the tail end electromagnetic stirring current is 300 A to 450 A, and the frequency is 8 HZ; according to the method for improving the internal structure of the heavy rail steel through combined electromagnetic stirring, the combined electromagnetic stirring, namely, the crystallizer electromagnetic stirring and solidification tail end electromagnetic stirring technology, is adopted, and the tail end electromagnetic stirring current is optimized; the problems of center segre