Commercial test for the effect of 300 mm x 340 mm bloom mold electromagnetic stirring-final electromagnetic stirring (M-EMS and F-EMS) and 3-section multiple EMS (M-EMS

S-EMS and F-EMS) on carbon segregation of bloom of steel 20CrMnTi (% ： 0. 17 ~0. 23C

0. 80 ~ 1. lOMn

1. 00 ~ 1. 30Cr

0.04 ~0. lOTi) has been carried out. Results show that as current intensity of M-EMS and F-EMS for 2-section stirring decreases respectively to 2 HZ/100 A and 20 HZ-100 A from original 2 HZ/250 A and 20 HZ/150 A

the max different of carbon content in steel at section of bloom decreases to 0. 02% from original 0. 05% ； and as using 3-section multiple EMS

i. e. current intensity- 2 HZ/100 A for M- EMS

20 HZ/50 A for S-EMS and 20 HZ/100 A for F-EMS

the max different of carbon content in steel at section of bloom is 0. 02%

while the rating of centre porosity of rolled products decreases to 1. 0 ~ 1. 5 from original 1. 0 ~ 2. 0 as using 2- section EMS

and the occurred ratio of square segregation decreases to 0. 8% from 9. 7%.