LOW-CARBON STEEL MAKING METHOD Russian patent published in 2013 - IPC C21C7/10 

FIELD: metallurgy.

SUBSTANCE: method for steel pouring to a steel-pouring ladle involves pre-deoxidation and alloying with manganese-containing ferroalloys, out-of-furnace metal treatment is performed at a circulation steel vacuumising plant; at that, negative pressure is set in a vacuum chamber for not more than 10 mbar and argon consumption for mixing is 0.8 to 1.1 l/(t*min). After that, final deoxidation and metal alloying in the vacuum chamber is performed with aluminium shot in the quantity of 1.5…2.5 kg/t in terms of obtaining the required content of aluminium in metal. At that, total duration of vacuumising is set from 10 to 15 minutes.

EFFECT: invention allows maximum elimination of non-metallic inclusions, reduction of aluminium consumption and stabilisation of metal pouring process owing to improving poured steel quality.