针对采用弱脱氧工艺冶炼超低碳钢，利用Factsage软件计算了顶渣氧化性与钢水氧活度之间的关系，进而计算了炉渣各组元对硫分配比的影响。结果表明，对于超低碳钢的生产，顶渣中w(FeO+MnO)至少应控制在15%以下，w(CaO)/w(Al2O3)控制在2.5~4.0。工业试验表明，通过顶渣改性将w(FeO+MnO)控制在15%以下可避免回硫现象的发生，成品硫质量分数小于0.005%，达到了钢种要求。
Based on the softkilled process for ultralow carbon steel, the relationship between oxidizability of top slag and oxygen activity in steel was calculated using software Factsage, and then the effect of components of top slag on sulphur distribution ratio was also calculated. The results indicated that for ultralow carbon steel making,w(FeO+MnO) in top slag should be controlled below 15% at least, and w(CaO)/w(Al2O3) should be controlled 254.0. Industrial test showed that after the w(FeO+MnO) is controlled below 15% through the slag property changing treatment, the resulfurization can be avoidable, the sulfur content of products is controlled lower than 0.005%, and the requirements for the steel can be met.
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