METHOD OF REFINING MOLTEN STEEL Russian patent published in 2024 - IPC C21C7/72 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and can be used for refining molten steel in a ladle. In the process of gas mixing, the molten steel surface is exposed to hydrogen gas or a gaseous mixture of hydrogen gas and an inert gas in the form of plasma gas from the plasma generator above the steel melt under conditions which satisfy the expression G_P×(H₂)/Q is more than or equal to 0.05, where G_P is flow rate (n.m³/min) of plasma-forming gas, H₂ is concentration of gaseous hydrogen (vol.%) in plasma-forming gas, Q is rate of circulation of molten steel in ladle (t/min). Plasma treatment reduces amount of one, two or more elements selected from oxygen, nitrogen and sulphur contained in molten steel.

EFFECT: invention enables to obtain high-purity steel with fewer impurities.

7 cl, 1 dwg, 2 tbl, 19 ex