METHOD OF STEEL PRODUCTION Russian patent published in 2017 - IPC C21C7/00 C21C7/10 

FIELD: metallurgy.

SUBSTANCE: method involves smelting a metal with a carbon content of more than 0.03 wt %, melt release into the ladle with slag separation, adding slag-forming and alloying materials, vacuum treatment of the melt in the ladle, deoxidation, adding alloying materials and casting. During metal smelting in course of vacuum processing and before casting, the content of hydrogen, sulfur, oxygen activity in molten metal and slag on oxidation degree of iron oxide is determined, and melt is discharged into the ladle when hydrogen content reaches ≤5 ppm, sulphur ≤0.005 wt %, oxygen activity is 200-500 ppm in melt, and slag oxidation degree on iron oxide is 3-20%, deoxidation is carries out after hydrogen content reaches ≤1.5 ppm, sulphur ≤0.005 wt %, oxygen activity ≤100 ppm in the melt and slag oxidation degree on iron oxide is ≤0.2-0.8%, and the casting is conducted lead after hydrogen content is ≤1.2 ppm, sulphur ≤0.005 wt %, oxygen activity ≤5 ppm in the melt and the slag oxidation degree on iron oxide is ≤0.2%.

EFFECT: invention makes it possible to increase the purity of the metal with regard to non-metallic inclusions, and reduce the propensity of the steel to flock formation.

1 cl