Method for continuous casting bearing steel

摘要

PURPOSE: A method for continuous casting a bearing steel is provided to reduce center segregation by synthetically interpreting influences on the center segregation by each key technologies in the continuous casting and controlling the conditions thereof. CONSTITUTION: The method comprises the steps of controlling a degree of overheating in a tundish (3) of molten steel comprising 0.95 to 1.02 wt.% of C, 0.25 to 0.45 wt.% of Mn, 0.15 to 0.25 wt.% of Si, 0.045 wt.% or less of P, 0.010 to 0.040 wt.% of sol-Al and 1.35 to 1.55 wt.% of Cr to 12 to 15 deg.C; casting the molten steel at a casting speed of 0.60 to 0.63 m/min by injecting the molten steel into a mold (7); solidifying the strip by cooling a strip transferred after passing through the mold to a water-liter steel-ton of 0.11 to 0.17 l/kg in a second cooling zone (8); and light reduction rolling the solidified strip to a thickness reduction of 6 to 7mm, wherein S-EMS (standard-electric magnetic stirring) is controlled at a frequency of 10 Hz and current density of 301 to 400 A, and F-EMS (final-electric magnetic stirring) is controlled at a frequency of 15 Hz and current density of 401 to 500 A in the second cooling zone (8).