Abstract
Ural Steel has rebuilt its arc steelmaking furnace No. 1, equipping it with wall and door multi-lances that are moved into position by hydraulic manipulators. The changes have allowed the company to introduce a system that speeds up the steelmaking operation. Use of the system has shortened the average heat to 89 min. Unit electric-power consumption was previously 406 kWh/ton liquid steel and electrode consumption averaged 4.2 kg/ton. The replacement of 25 tons of solid pig iron by the same amount of liquid pig in each heat has made it possible to lower the average unit consumption of electric power to 382 kWh/ton and shortened the time of operation of the furnace under current to 50 min. The coefficient characterizing the use of oxygen in the blow is now within the range 0.86–0.92%.
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