TiN inclusions are one of the main reasons for wire breakage during drawing or twisting of C82DA cord steel. The 110 t BOF-LF-150 mm x 150 mm CC smelting process is used to produce C82DA steel. The research on the precipitation conditions of TiN

TiN inclusions can be reduced by decreasing the Ti and N content in molten steel. By means of controlling the amount of going down slag from converter

using alloys and slag materials with low titanium content

and controlling the amount of ladle residual slag

it can reduce the titanium content in molten steel. By shortening the BOF tapping time ≤4 min

maintaining the tap hole to avoid loose flow and trickle

optimizing the continuous casting nozzle

etc.

it can reduce the nitrogen addition amount

Ti and N content of C82DA steel can be controlled to ≤ 2X10

-6

and ≤50 x 10

-6

respectively

to obviously decrease the TiN inclusions in steel.