Characteristics of Decarburization Reaction by Combined Oxygen Blowing in High Carbon Range of Stainless Steel Melts

摘要

From the results of the experiments using a 100 kg induction furnace and a 60 ton AOD, it was found that efficiency of decarburization with the combined blowing became larger than that with the top blowing or the bottom blowing. It was suggested that the formation and reduction of (Cr_2O_3) in the hotspot with high temperature have influenced on decarburization reactions. The decarburization potential by chromium-oxide (CRP) was definded as the sum of the discrepancy (-#DELTA#G) from decarburization reaction equilibrium by (Cr_2O_3) in hotspot and bulk of metal, and experimental results were evaluated by using CRP.There were good correlations between efficiency of decarburization and the value of CRP in every oxygen blowing types.The decarburization rate was controlled by the balance of oxygen blowing rate and rate of carbon supply and conditions of reaction zone, and the decarburization by combined blowing with hard top blowing was promoted by the reduction of (Cr_2O_3) in hotspot region.