IF钢RH脱碳结束氧含量对钢液洁净度的影响

炼钢 ›› 2023, Vol. 39 ›› Issue (2): 24-27.

IF钢RH脱碳结束氧含量对钢液洁净度的影响

安超，李辉，张普，李利杰，杜国峰，刘晓明

首钢京唐钢铁联合有限责任公司炼钢作业部，河北唐山 063210

出版日期:2023-04-05 发布日期:2023-04-06

Effect of oxygen content on liquid steel cleanliness after RH decarburization of IF steel

Online:2023-04-05 Published:2023-04-06

摘要/Abstract

摘要： 以IF钢为研究对象，结合首钢京唐钢铁联合有限责任公司300 t RH生产实际，采用生产密集取样、数据统计、夹杂物扫描电镜等分析手段，对IF钢精炼过程中RH脱碳结束氧含量与脱氧后的夹杂物尺寸、数量等进行了研究。研究发现，RH脱碳结束氧质量分数控制在(290～310)×10^-6时，钢液中产生的Al₂O₃夹杂物最少。基于此，对RH脱碳结束氧含量的控制方法进行研究，发现强制脱碳模式下脱碳结束氧含量命中率高、可控性强，且强制脱碳模式下顶渣氧化性弱于自然脱碳模式，可减少二次氧化导致的Al₂O₃夹杂物的生成。研究并建立吹氧计算模型以保证达到精确控制脱碳结束氧含量，可达到提高钢液洁净度的目的。

关键词: IF钢, RH, 精确控氧, 洁净度

Abstract: Taking IF steel as the research object, combined with the production practice of 300 t RH furnace of Shougang Jingtang company, the oxygen content at the end of RH decarburization and the size and quantity of inclusions after deoxidation in the smelting process of IF steel were studied by means of production intensive sampling, data statistics, inclusion scanning electron microscope and other analysis methods. It was found that when the oxygen mass fraction after RH decarburization was controlled at (290-310)×10^-6, the Al₂O₃ inclusions produced in molten steel were the least. Based on this, the control method of oxygen content at the end of RH decarburization was studied. It was found that the hit rate of oxygen content at the end of decarburization in the forced decarburization mode was high and controllable, and the oxidation of top slag in the forced decarburization mode was weaker than that in the natural decarburization mode, which could reduce the formation of Al₂O₃ inclusions caused by secondary oxidation. The oxygen blowing calculation model was studied and established to ensure accurate control the oxygen content at the end of decarburization, which could improve the cleanliness of molten steel.

Key words: IF steel, RH, precise control of oxygen content, cleanliness

安超, 李辉, 张普, 李利杰, 杜国峰, 刘晓明. IF钢RH脱碳结束氧含量对钢液洁净度的影响[J]. 炼钢, 2023, 39(2): 24-27.

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