REFINING CONTROL MODEL FOR STAINLESS-STEE L

The refining control model for stainless steel was developed. At the t ime of developing this model, the refining index that was concerned wi th distributing oxygen to C and Cr was derived. The following points w ere clarified: 1) The refining control model that was composed of the mass balance and the beat balance in the converter and made it possibl e to estimate the composition of molten steel, the amount and composit ion of slag, and temperature of molten steel was developed. 2) The ref ining index (DOS) in which the bulk region as a reaction site in addit ion to the fire spot regions of top and bottom blowing was taken into consideration, was derived. 3) This model was applied to the actual YA WATA 145t LD-OB converter and it became possible to estimate [%C], [%C r], temperature of molten steel, and the amount and the composition of slag accurately.