IF钢210t RH精炼过程中调钛时机对洁净度的影响

Effect of Timing of Titanium Adjustment in 210t RH Refining Process on Cleanliness of IF Steel

通过在210 t RH精炼IF钢3个浇次的试验,采用扫描电镜详细研究了RH精炼过程中调Ti时机对IF钢洁净度的影响。结果表明,加Al后2、4、6 min调Ti,RH结束时钢液中的N含量平均分别为26.7×10^(-6)、23.6×10^(-6)、27.4×10^(-6)。当吹氧升温所耗氧气量在30~40 m^(3),RH到站氧平均为579×10^(-6)时,RH结束T[O]为70.3×10^(-6),当吹氧升温氧耗量在75~90 m^(3),RH到站氧平均为669×10^(-6)时,RH结束T[O]为109.2×10^(-6)。随着加Al前氧活度增加,RH结束时T[O]总体呈增加趋势。加Al后6 min调Ti钢中5μm当量直径夹杂物数量密度最低为9.32个/mm 2,夹杂物数量密度最低。

Through 3 heats IF steel of 210 t RH refining process test,the effect of titanium-adjusted time on cleanliness of IF steel in RH refining process is studied by scanning electron microscopy.The results indicate that titanium adjustment after adding aluminum for 2,4 and 6 min,the average N content in molten steel at RH end is 26.7×10^(-6),23.6×10^(-6)and 27.4×10^(-6),respectively.When the oxygen blowing amount for heating,the oxygen consumption is 30~40 m^(3)and the average initial oxygen content in liquid of RH is 579×10^(-6),the T[O]is 70.3×10^(-6)at the RH end;When the oxygen blowing amount for heating,the oxygen consumption is 75~90 m^(3)and the average arrival oxygen of RH is 669×10^(-6),the T[O]is 109.2×10^(-6)at the RH end.The T[O]at the RH end shows an increase trend with the increase of oxygen activity before adding aluminum.The quantity density of inclosions with 5μm equivalent diameter in steel is 9.32/mm 2 when adjusted Ti alloy after adding aluminum 6 min,it is lowest.