METHOD OF PRODUCING TUBE STEEL Russian patent published in 2017 - IPC C21C5/52 C21C7/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy, in particular, production of carbon and low-alloy tube grades of steel deoxidized by aluminium. The method includes melting a half-product in an arc steel-melting furnace, discharging the half-product into a steel-teeming ladle with a simultaneous addition of deoxidizing agents, and alloying and part of slag-forming materials, doping of metal by chemical composition and temperature, and final deoxidation and calcium modification in furnace-ladle plant, vacuum treatment with subsequent blowing of metal with argon and pouring metal in continuous casting machine. Tapping of metal melt into steel-teeming ladle is carried out at oxidation of not more than 800 ppm, metal modification is carried out containing not more than 0.004% of sulphur, calcium is introduced in the amount of 15-20 ppm, after final deoxidation of metal to aluminium content of 0.025-0.03% followed by vacuum treatment and blowing of metal with argon no more than 30 s after vacuum removal.

EFFECT: improved quality of steel due to reduced content of non-metallic inclusions, reduced cost of steel due to reduced consumption of deoxidizing agents and modifiers.

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