LANCE FOR METAL BLOWING Russian patent published in 1998 - IPC

FIELD: metallurgy, more specifically, lances for blowing of metal in converter in steel melting. SUBSTANCE: the offered lance has concentrically located tubes for oxygen supply, delivery and discharge of coolant, end head consisting of external and internal plates interconnected by Laval nozzles and axial branch pipe with cylindrical channel located at some angle to lance longitudinal axis. Channel is made of two successively located cylindrical holes with different diameters and interconnected by conical hole. Diameter of outlet cylindrical hole equals (0.2-0.5)D, its length is(0.2-2.0)D, angle of inclination of conical section of surface to its longitudinal axis is 10-30 deg, and length of conical section equals (0.2-0.8)D, where D is critical diameter of Laval nozzle. EFFECT: higher stability of lance, increased yield of steel from converter due to reduced splashing of metal from converter. 1 dwg , 1 tbl