Effects of Oxygen Blowing Types on Decarburization Reaction in High Carbon Range of Stainless Steel Melts

摘要

The experiments using a 100 kg induction furnace were carried out to evaluate the effect of combined blowing on efficiency of decarburization of high carbon stainless steel melt. Temperature of hotspot area was measured by an optical fiber scope and fluid motion was observed by a video. Also, micro analysis of samples taken from hotspot area was done. Results were summarized as follows:1. Efficiency of decarburization with the combined oxygen blowing became larger than that with top oxygen blowing or bottom oxygen blowing. By micro analysis of hotspot samples and video observations, the bottom blowing oxygen gas in combined blowing promoted the interface stirring between metal and slag and the reduction of (Cr_2O_3) in hotspot region.In combined oxygen blowing with same oxygen blowing conditions, temperature of hotspot area raised with raising the bath temperature, and efficiency of decarburization increased. This reason was explained by the promotion of (Cr_2O_3) reduction in hotspot by means of raising the hotspot temperature.