Study On Inclusion Control And Purity In LF Refining Of Low Carbon Steel

The argon blowing system of ladle refining(LF)process in a steel plant was studied by means of water simulation and numerical simulation.At the same time,the level of inclusions in steel was investigated under the existing production process conditi0 ons,which provided guidance for the actual production work.The results shown that:When the angle between the two bottom blowing holes was 90° and the bottom blowing gas flow rate was 510L/h,the mixing time was 52 s,and there was no big fluctuation.Compared with 14 s shorter,the optimization effect was obvious.The numerical simulation results shown that: the rising bubbles are discontinuous at a certain instant,and the relative distribution is relatively continuous after average.With the increase of the discontinuity of bubbles,they oscillate and vibrate continuously,which increased the possibility of slag layer breaking and being involved in molten steel;with the increasing of blowing flow rate,the height of liquid steel bulge increased,but the volume fraction of liquid steel in the bulge area decreased with the increase of blowing flow rate;with the same bottom blowing rate,with the increasing of slag thickness,the height of liquid steel bulge increased and the diameter of bare slag decreases.The results shown that: in the process of ladle refining,the concentration of oxygen tended to be the same in the tundish: 46?50 ppm,which is at a good level in the actual production;the results of microscopic observation showed that the effect of calcification is not good;the results of large sample electrolysis show that at the end of LF slagging,the size of Al2O3 inclusion is millimeter.Figure 44;Table 14;Reference 40...