ANTI-CARBURETION METHOD FOR PRODUCING LOW-CARBON AND LOW-SULFUR STEEL BY MEANS OF LF REFINING FURNACE

摘要

The present invention provides an anti-carburetion method for producing low-carbon and low-sulfur steel by means of an LF refining furnace. A bottom blowing flow rate of a ladle at a station to be treated of an LF furnace is controlled to initially range from 45 NL/min to 55 NL/min, and after molten steel reaches a work station and a furnace cover is closed in place, the bottom blowing flow rate of the ladle is controlled to range from 150 NL/min to 200 NL/min; 0.20-0.25 Kg/t of steel-aluminum wires are added to ladle slag for slag deoxidation, and 1.0-1.5 m/t of steel-aluminum wires are fed into the molten steel for molten steel deoxidation. In a lower electrode treatment process, the bottom blowing flow rate of the ladle is controlled to range from 250 NL/min to 400 NL/min, and the total amount of the ladle slag is controlled to range from 12 Kg/t steel to 14 Kg/t steel. Aluminum wires are added into a slag face in batches, and 0.12-0.15 Kg/t of steel-aluminum wires are added in each batch for slag formation. The bottom blowing flow rate of the ladle is controlled to range from 150 NL/min to 200 NL/min. By means of the present invention, the carburization content during the entire smelting process of an LF refining furnace can be stably controlled within 0.015%, components at the smelting end point are stably and accurately controlled, so that the purity of molten steel meets the requirements for high-quality molten steel, the judgment changing rate is reduced, and economic benefits are improved.