VD炉氧脱碳工艺生产实践

 为了研发MCCR低碳钢种,采用KR→转炉→VD炉→LF炉工艺流程,开发利用VD炉氧脱碳工艺,生产超低碳钢(w(C])小于0.02%)。复吹转炉出钢w(C])小于0.06%,沸腾出钢,出钢过程平均脱碳率为33%;VD炉真空处理保持深真空(小于67 Pa),脱碳率达到65%,实现脱碳后平均w(C])为0.006 7%,最低w(C])为0.002 3%。LF炉采用控制增碳深脱硫,完全能够满足MCCR超低碳超低硫钢生产需求。

Practice of VD furnace oxygen decarburization process

To research and develop MCCR low carbon steel,in the process of "KR→converter→VD furnace→LF furnace", the decarburization process using oxygen in VD furnace was developed to produce ultra-low carbon steel (w(C])<0.02%). w(C])was less than 0.06% and the average decarburization rate was 33% during the tapping of boiling steel from the combined blown converter. The vacuum treatment was used in VD furnace. The high vacuum was maintained and the vacuum degree is less than 67 Pa.The decarburization rate reached 65%. The average w(C]) was 0.006 7%, and the lowest w(C]) was 0.002 3%. In LF furnace controlled carbonization and deep desulfurization were employed, which can completely meet the production demand of MCCR ultra-low carbon and sulfur steel.