The quality of 150 mm ×150 mm casting billet of 0.60C steel(0.57%~0.62%C) with and without M-EMS (mold electromagnetic stirring) has been systematically studied
and the M-EMS process was optimized. Results showed that with stronger M-EMS current intensity (250 A) and lower superheating extant of liquid steel(≤25 ℃)for casting process
the quality of billet was obviously improved
i.e.the average ratio of equiaxed zone at billet centre of 0.60C steel increased to 52.58% from 27.65%
the central carbon segregation index decreased from 1.07 to 1.01
the content and size of inclusions in billet decreased markedly as the oxide inclusions in liquid steel were efficiently removed.