Effect of oxygen blowing under reduced pressure on decarburization reaction of ultra-low carbon steel

摘要

The effect of oxygen blowing under reducedpressure on decarburization and temperature changes were studiedusing an RH vacuum degasser. The decarburization rate wasincreased from 0.17 to 0.19min-1 by oxygen blowing duringdecarburization. It was caused by the increase of effective reactionarea such as cavity and splash formed by oxygen blowing on meltsurface. The carbon content below 20ppm was obtained by oxygenblowing. An average TDR (temperature drop-rate) duringdecarburization was decreased to -0.6℃/ min by oxygen blowing.It was caused by post combustion of the carbon monoxide gasgenerated from melt decarburization in RH vacuum vessel.