| 摘要 |
<p>PURPOSE:To rapidly and effectively remove Cr at the time of adding an iron oxide-contg. flux to the molten steel before being deoxidized and supplying gaseous oxygen to remove the contained Cr by using the flux having specified basicity related to the Fe content of slag. CONSTITUTION:When the Cr content of the molten steel before being deoxidized refined in a converter or an electric furnace exceeds the command, an iron oxide-contg. flux is added to the molten steel, gaseous oxygen is added, and the relation between the basicity (X) of the flux and the total Fe content (T.Fe) of the slag is adjusted as follows. Namely, (T.Fe)>=7.5% when 0<=X<1, (T.Fe)>=5% when 1<=X<2, (T.Fe)>=10% when 2<=X<3 and (T.Fe)>=15% when 3<=X, where X=(CaO)%+(MnO)%+(MgO)%/(SiO2)%+(Al2O3)%, the bracketed material is the one to be mixed into the flux, and % denotes wt.%.</p> |
