SI CONTAINED FERROALLOY ADDITION AS A WEAK PRE-DEOXIDATION PROCESS IN STEELMAKING

摘要

ABSTRACT OF THE DISCLOSUREThe 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 properamount of Si-containing ferro-alloy is added into molten steelduring tapping, as Weak Pre-Deoxidation, then the ladle istransferred to Al-Wire feeder system or ladle injection treat-ing equipment to proceed final stage of deoxidation. Not onlycan the recovery rate of deoxidizer be increased by this newprocess, 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 deoxidizeraddition, less billet conditioning cost, less rejection andless customer claim. Thus the W.P.D. process is a break-throughin present steelmaking practice.