C82DA帘线钢中TiN夹杂的控制

TiN夹杂是导致C82DA帘线钢拉拔成丝或捻股过程中断丝的主要原因之一。采用110 t BOF-LF-150 mm×150 mm CC的冶炼工艺生产C82DA钢。经对TiN析出条件的研究,可通过降低钢液中的Ti和N含量来减少TiN夹杂。通过控制转炉下渣量,使用Ti含量低的合金及渣料,控制钢包残渣量等措施来降低钢液中Ti含量;采用降低BOF出钢时间至≤4 min,维护好出钢口避免散流和细流,对连铸长水口进行优化等措施降低增N量。可控制C82DA钢中Ti含量≤2×10^-6和N含量≤50×10^-6,使TiN夹杂得到了显著降低。

Control of TiN Inclusions in C82DA Tire Cord Steel

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.