METHOD OF REPAIRING STEEL-TAPPING HOLE OF BASIC OXYGEN FURNACE Russian patent published in 2017 - IPC C21C5/44 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy, in particular to a method of hot repair of the tap hole of basic oxygen furnace. Method involves installation in the tap hole of the refractory block threaded on the metal tube, made in a form of a single piece comprising a flat washer and a truncated cone with the height of 1.5–2.0 of the tap hole diameter, and gunning of refractory block by gun mixture. Refractory block is installed in the tap hole ensuring the arrangement of the upper edge of the metal pipe over the tap hole. A flat washer is made with outer diameter equal to 2–3 diameters of the tap hole, and with a height equal to 0.5–1.0 of the diameter of the tap hole. On the outer surface of the flat washer evenly perform 3–4 vertical slits, the depth of which is equal to 1/3 of the radius.

EFFECT: use of the invention provides increased durability of tap hole.

3 cl, 7 dwg, 1 ex