Si contained ferroalloy addition as a weak pre-deoxidation...

Details Si contained ferroalloy addition as a weak pre-deoxidation... Si contained ferroalloy addition as a weak pre-deoxidation...

C - Chemistry, Metallurgy

21

C

53/107

C21C 7/06 (2006.01)

Patent

CA 1249724

ABSTRACT OF THE DISCLOSURE The present invention relates to a Weak Pre-Deoxida- tion 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 treat- ing 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 inter- nal 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.

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