Effect of stirring force by bottom blown gas and partial pressure of CO in it on characteristics of metallurgical reaction in a converter

Experiments were carried out in 5 t converter using five kinds of gases as a bottom blown gas. The results obtained are summarized as follows: Independently of the bottom blown gas, oxygen concentration dissolved in steel decreases with increasing gas flow rate of bottom blown gas. Taking into consideration oxygen transfer from metal to slag, the model can reasonably explain the phenomena that concentrations of carbon and oxygen reduce to those in equilibrium with less than 1.0 atm of CO. The amount of oxygen transfer from metal to slag increases with increasing the stirring force by bottom blown gas and decreasing carbon concentration in molten steel. The effect of dilution of P_CO on behavior of oxygen concentration in steel and (%T.Fe) in slag is considered to be small. Hence, the decrease of oxygen and (%T.Fe) in IOD(Inert and Oxygen Gases Decarburization) mode result from the increase of stirring intensity by inert gas blown from bottom.