摘要
为了实现超洁净低磷钢的批量高效生产,研究开发了大型转炉基于低MgO(2.5%≤w(MgO)≤4.0%)、低MnO(w(MnO)≤1.5%)、高碱度(R≥6)和超高磷分配系数(L_(P)≥1 500)的极低磷钢高效冶炼技术。研究发现,减低钢渣中MgO和MnO含量及提高钢渣碱度可以大幅提高转炉终点渣钢平衡磷分配系数LPbal至1 500以上。通过优化冶炼初期炉料结构,提高钢渣氧化性,实现高速化渣,半钢渣中平均磷质量分数达到3.47%、FeO质量分数控制在17%~20%;通过倒渣模型计算和优化及自动控制,实现半钢快速高效稳定倒渣,经测量半钢结束倒渣量控制在35%以上;通过熔池高效搅拌,使实际生产渣钢磷分配系数LPact与理论平衡磷分配系数L_(Pbal)的比值平均为0.81左右。采用低温出钢等低磷钢冶炼技术,实现双渣工艺冶炼转炉出钢最低磷质量分数为0.000 38%、整浇次转炉出钢平均磷质量分数为0.000 73%、整浇次成品平均磷质量分数为0.001 05%的批量、稳定、高效生产,平均转炉冶炼周期为42 min。本研究首次发现并应用的转炉炼钢超深脱磷技术,对低磷洁净钢冶炼具有很好的参考价值和技术应用前景。
In order to realize the high efficiency production of the ultra-clean steel with low-phosphorus,the efficient smelting technology of ultra-low phosphorus steel based on low MgO(2.5%≤w(MgO)≤4.0%),low MnO(w(MnO)<1.5%),high alkalinity(R≥6)and ultra-high phosphorus distribution coefficient(L_(p)≥1500)was studied and developed.It is found that reducing the content of MgO and MnO in steel slag and increasing the alkalinity of steel slag can greatly improve the balance phosphorus distribution coefficient Lpbal of converter end slag to more than 1500.By optimizing the burden structure in the early stage of smelting,the oxidation of steel slag is improved,and high-speed slag melting is realized,the average phosphorus content reaches 3.47% and the FeO content is controlled at 17%-20%in semi-steel slag.Through calculation and optimization of the slag-dumping model and automatic control,the rapid,efficient and stable slag pouring of semi-steel is realized,and the amount of slag pouring at the end of semi-steel is controlled above 35%.Through the efficient stirring of molten pool,the ratio of actual production slag steel phosphorus distribution coefficient Lpact to theoretical balance phosphorus distribution coefficient Lpbal is about O.81 on average.Low phosphorus steel smelting technology such as low temperature tapping is adopted to realize batch,stable and efficient production of converter tapping with the minimum phosphorus mass fraction of 0.00038%,the average phosphorus mass fraction of 0.00073% and 0.00105%for converter tapping and finished product respectively by double slag process smelting.The average converter smelting cycle is 42 min.In this study,the ultra-deep dephosphorization technology of converter steelmaking is first discovered and applied,which has a good reference value and technical application prospect for low phosphorus clean steel smelting.
作者
吕延春
周德光
朱国森
朱志远
王国连
李海波
刘洋
LU Yanchun;ZHOU Deguang;ZHU Guosen;ZHU Zhiyuan;WANG Guolian;LI Haibo;LIU Yang(Research Institute of Technology,Shougang Group Co.,Ltd.,Beijing 100043,China;Engineering Research Center of Energy Steel,Beijing 100043,China;Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063210,Hebei,China)
出处
《中国冶金》
CAS
CSCD
北大核心
2023年第10期73-80,共8页
China Metallurgy
关键词
转炉
炼钢
MGO
磷分配系数
极低磷钢
高效冶炼
BOF
steelmaking
MgO
phosphorus distribution coefficient
ultra-low phosphorus steel
efficient smelting
