Abstract
The production flowsheet for MA ultra-low carbon steel (/%: less than or equal to 0.005C, 0.007~0.012Si, 0.07 ~ 0.15Mn, less than or equal to 0.025P, less than or equal to 0.025S, less than or equal to 0.035Als, less than or equal to 0.0020N) is KB-150 t BOF (end[C] less than or equal to 0.020% )-RH-200 mm slab CC flowsheet. The effect of mold flux, tundish shielding agent and ladle refractory materials on incremental carbon content in liquid has been tested and analyzed. Results show that the incremental carbon content in liquid in mold (AC 0.000 3% ~ 0.000 8%) is obviously higher that in tundish (AC 0.000 1% -0.000 5% ), through using the measures including defining metallurgy operation, controlling initial carbon content in mold flux 1%-2% and adding 3.5%-4.0% MnO(2) in flux, controlling the amount of tundish shielding agent, it is available to decrease the incremental carbon content in liquid.