Process for the refining of the steel by blowing oxygen by the bottom with an inert gas during the period

摘要

In the Q-BOP process for the production of low carbon steels (eg. 0.02 - 0.05% C), inert gas-oxygen mixtures are employed during the latter part of the blow, i.e. when the C content of the melt reaches a level of about 0.25%. As such lower carbon contents, the rate of decarburization is not decreased by dilution of the oxygen with inert gas. However, such dilution results in less O.sub.2 being available for oxidation of iron, hence significant increases in metallic yield may be achieved. By precise control of the O.sub.2 /inert gas ratio, increases in metallic yield in excess of 2% are achieved.