Si contained ferroalloy addition as a weak pre-deoxidation process in steelmaking

摘要

The present invention relates to a Weak Pre-Deoxidation Process (abbreviated as W.P.D. process) for producing Al-killed and/or Ti- Killed steel. In this process the proper amount of Si-containing ferro- alloy is added into molten steel during tapping, as Weak Pre-Deoxidation, then the ladle is transferred to Al-Wire feeder system or ladle injection treating equipment to proceed final stage of deoxidation. Not only can the recovery rate of deoxidizer be increased by this new process, but also the cleanliness as well as surface and internal quality of products are effectively improved. Besides, the production cost will be reduced due to less deoxidizer addition, less billet conditioning cost, less rejection and less customer claim. Thus the W.P.D. process is a break- through in present steelmaking practice.