RH-MFB生产超低碳钢的工艺优化

Process optimization for production of ultra-low carbon steel by RH-MFB

在RH脱碳静态模型的基础上对RH脱碳理论进行了分析，分析结果表明，涟钢RH的实际脱碳水平还有待提高。针对影响RH脱碳速率的主要因素进行分析，结果表明：为获得最佳脱碳效果，处理时应消除压降平台，全程真空度在400Pa以下保持16min以上，同时在钢水循环开始后的3～4min控制吹氩流量为80～100m^3/h；真空度达8kPa以后（即3min左右时）为吹氧的最佳时机，此时应将氧枪高度控制在250～400cm，氧气流量控制在1200～1600m^3／h。实践证明，通过这些优化措施，可使处理后碳质量分数稳定在0．003％以下。

The RH decarburization theory has been analyzed on the basis of RH decar-burization static model. The overall results indicate that the practical decarburization level in Liangang s RH needs to be further improved. Analysis on the main factors influencing the RH indicates that in order to obtain the optimal decarburization result it＇s im- perative to eliminate the pressure drop platform and maintain the vacuum degree below 400 Pa for more than 16min in the process of RH treatment and moreover, flow rate of argon should be controlled at 80～100 mB^3/h in first 3～4 minutes after molten steel cir culation starts and as soon as the vacuum degree reaches 8 kPa （around 3 minutes）, which is supposed to be the best iuncture for blowing oxygen the height of oxygen lance should be maintained at 250～400 cm and the oxygen flow rate be controlled at 1 200～1 600 m^3/h. Practical results show that by application of these optimized measures the carbon content in after treatment is steadily reduced to below 0. 003%.