Abstract: In view of the problem of bottom height rising of 65 t top and bottom combined blown converter in Masteel, the causes were analyzed and some solutions were proposed. Production practice showed that,by using the reaction of molten iron and oxygen,the height of converter bottom could be reduced rapidly by controlling the lance position, oxygen accumulation and erosion time. The splash rate decreased from 0.63 % to 0.31 % due to blowing difficulty caused by converter bottom exceeding upper limit, and ferrous charges consumption was reduced by 4.16 kg/t, which provided a strong guarantee for converter steelmaking production safety.

Key words: top and bottom combined blown converter, height of converter bottom, splash rate