Application effect of roll-type electromagnetic stirring (400 A

1 ~ 16 Hz) in secondary cooling zone of (200 - 300) mm x (1 200 〜2 300) mm slab caster for steel Q345B

Q550D and Q345E at Baotou Steel is presented. Production practice results show that with same continuous casting process the internal quality of casting slab is improved obviously by using final electromagnetic stirring process

i. e. the average central equiaxial crystal ratio increases to 30. 3% from original 9. 7%

the central carbon segregation index reduces to 1. 01 from 1. 17 and the average A-type central segregation ratio decreases to 0. 6% from 5.1%.