Abstract
The practice of combination blowing has been instituted and tested on 60-ton oxygen converters. The inert gas (nitrogen, argon) was fed into the bath from below through four blocks with directional porosity. Oxygen was supplied from above through a four-channel lance. Different regimes for delivering the inert gas were tested including providing for complete combustion of CO to CO/sub 2/ with the top lance raised. Indices were compared for heats made in the same converter but using either combination or top blowing. The analysis showed that the use of combination blowing at a unit inert-gas consumption of about 1.5 m/sup 3//ton increases usable output by 0.6% and raises the residual manganese content of the steel by 0.02 to 0.03%.
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