Abstract
The “Slag-Remaining+Double-Slag” BOF steelmaking process has been developed and applied in Shougang Corporation, Ltd., by which consumption of lime and volume of slag in BOF steelmaking are remarkably decreased. In this paper, three important technologies taken in application of the new steelmaking process are introduced: 1. To solve the two most serious problems, i.e. difficult to make fast and enough amount of deslagging and decrease the metallic Fe droplets in the slag, low basicity slag is used in the dephosphorization stage. 2. Hard blow pattern is adopted to utilize the top blown O2 jet to strengthen agitation of the bath in the dephosphorization stage, through which good dephosphorization has been obtained. (3) By speeding up the steelmaking operations and particularly better matching the BOF, secondary refining and continuous casting productions, productivity has not been reduced though the BOF tap to tap time has been increased by about 4min after using the new process.
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