METHOD FOR PRODUCING LOW PHOSPHOROUS STEEL BY OXYGEN FRESH AND APPLICATION OF THE METHOD

摘要

The present invention relates to a process for obtaining low phosphorus steel by oxygen refining of liquid iron in the presence of a slag containing lime, alumina, silica and iron oxides wherein at the beginning of the operation is added to the liquid metal a charge obtained by granulation and calcination of a mixture of an hydraulic aluminous cement with lime and magnesia in order to obtain at the end of the operation a slag containing }CaO 40 to 60 % }SiO2 5 to 25 % }MgO 2.5 to 15 % }Al2O3 5 to 25 % }Iron oxides expressed }as Fe2O3 10 to 35 % }P2O5 0.5 to 10 % } The process for obtaining steel by oxygen refining of iron known under the names of LD, LD-AC, Kaldo, OLP etc . . . which have made their appearance since a quarter of a century have seen their economic importance grow rapidly.