无取向电工钢RH精炼顶渣优化

Optimization of RH top slag for non-oriented electrical steel

采用FactSage7.2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SiO_(2)将造成钢液的二次氧化。结合热力学分析、顶渣对Al_(2)O_(3)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(SiO_(2))≤5.01%,w(CaO)/w(Al_(2)O_(3))=1.5~2.0。精炼结束渣系接近低熔点,w(CaO)/w(Al_(2)O_(3))≈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。

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 SiO_(2)in RH top slag would cause secondary oxidation of steel.Combined with thermodynamic analysis,calculation of the absorption capacity of the top slag for Al_(2)O_(3)and industrial tests,the ideal RH refining process top slag composition range is w(CaO)=50%~60%,w(SiO_(2))≤5.01%,w(CaO)/w(Al_(2)O_(3))=1.5~2.0.At the end of refining,the slag system is close to the low melting point,w(CaO)/w(Al_(2)O_(3))≈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 from4.6%to 0.3%,and the smelting effect of RH top slag was excellent.