炼钢 ›› 2021, Vol. 37 ›› Issue (6): 28-33.

• 炉外精炼 • 上一篇    下一篇

无取向电工钢RH精炼顶渣优化

刘坚锋1,2, 胡金文1,2, 郭飞虎1,3, 余小琴2, 乔家龙1, 仇圣桃1   

  1. (1.钢铁研究总院 连铸技术国家工程研究中心,北京 100081;
    2.新余钢铁股份有限公司 营销中心,江西 新余 338001;
    3.东北大学 冶金学院,辽宁 沈阳 110819)
  • 出版日期:2021-12-05 发布日期:2021-12-03

Optimization of RH top slag for non-oriented electrical steel

  • Online:2021-12-05 Published:2021-12-03

摘要: 采用FactSage 7.2 热力学软件研究了无取向电工钢RH精炼过程顶渣的理化特性,结合工业生产提出顶渣优化方案,并进行了工业试验。研究表明,精炼过程顶渣FeO和SiO2将造成钢液的二次氧化。结合热力学分析、顶渣对Al2O3吸收能力计算和工业试验,理想RH精炼开始顶渣成分范围为:w(CaO)=50 %~60 %,w(SiO2)≤5.01 %,w(CaO)/w(Al2O3)=1.5~2.0。精炼结束渣系接近低熔点,w(CaO)/w(Al2O3)≈1.25。工业试验结果表明,顶渣成分优化后,精炼结束钢水w(T.O)=14×10-6,冷轧产品表面缺陷率由4.6 %降至0.3 %,精炼顶渣的冶炼效果优异。

关键词: 无取向电工钢, RH精炼, 顶渣优化, 钙铝比, 表面缺陷

Abstract: The physical and chemical properties of RH top slag for non-oriented electrical steel were studied by FactSage 7.2 thermodynamics software. The top slag optimization plan were proposed in combination with industrial production. Studies have shown that FeO and SiO2 in RH top slag would cause secondary oxidation of steel. Combined with thermodynamic analysis, calculation of the absorption capacity of the top slag for Al2O3 and industrial tests, the ideal RH refining process top slag composition range is w(CaO)=50 %~60 %,w(SiO2)≤5.01 %,w(CaO)/w(Al2O3)=1.5~2.0. At the end of refining, the slag system is close to the low melting point,w(CaO)/w(Al2O3)≈1.25. Industrial experiments showed that after the top slag compositions were optimized, T.O mass fraction of steel reached 14×10-6 at the end of refining, the surface flaw rate of cold-rolled products decreased from 4.6 % to 0.3 %, and the smelting effect of RH top slag was excellent.

Key words: non-oriented electrical steel, RH refining, slag optimization, w(CaO)/w(Al2O3), surface flaw