Abstract: Aimed to the problem of low qualified rate of acidsoluble aluminum in liquid steel from converter into ladle furnace, the statistical analysis was carried out based on unqualified samples. The results showed that the low qualified rate was mainly affected by the smelting process control in the converter; through further study for the process control, three main influencing factors for low qualified rate were slag in tapping, inconsistent carbon and temperature, and unstable aluminum yield. Then detailed analyses were performed for above three influencing factors, and according process management system and improvement measures were proposed based on the analysis conclusions, thus the qualified rate of acid-soluble aluminum from converter into LF furnace was increased from 81 % to 88 %.

Key words: Al-killed steel, ladle furnace, acidsoluble aluminum