The effect of mold powder with different type and addition of carbon materials on carbon pick-up in 0.003%C ultra low carbon molten steel in 200 mm x 100 mm mold has been studied by theoretical calculation and experimental measurement. The results showed that with casting rate 2.0 m/min

on steady condition of continuous casting

the carbon pick-up content in steel was (1.2~2.4) X 10

-6

and on non-steady condition of continuous casting

the maximum carbon pick-up content in steel was 67.9 x 10

-6

. In 3 hinds of addition carbon materials the carbon pick-up content in molten steel in mold added graphite was highest

added carbon black next and added active carbon lowest; and with increasing the amount of carbon materials addition in powder

the carbon pick-up content in steel increased.