Method for preventing and controlling slag in thin slab continuous casting with high drawing speed and low carbon steel prepared

Abstract

The invention discloses a method for preventing and controlling slag curling in high-speed thin slab continuous casting, which is applied to low-carbon steel, including: performing desulfurization of molten iron pretreatment; performing converter smelting on the desulfurized molten iron; and performing ladle refining furnace after tapping from the converter LF refining; when the LF exits the station, control the calcium-aluminum ratio Ca / Als of the first furnace of molten steel to be 0.09-0.15, and the calcium-aluminum ratio Ca / Als of the second continuous casting furnace to be 0.04-0.08; after the LF exits the station Continuous casting of molten steel, the superheat of the tundish is controlled to be 15°C-28°C, and the average superheat difference between furnaces is less than 5°C; the insertion depth of the submerged nozzle is controlled to be 75-85mm, and the slag of the submerged nozzle is controlled The line range is 0-40mm; the viscosity of mold flux is controlled to be 0.2-0.7Pa·S, the basicity is 1.20-1.30, the softening temperature is 970-1030℃, and the melting temperature is 1020-1080℃. The above method can significantly reduce the probability of slag entanglement in the high-speed thin slab continuous casting stage, thereby ensuring product quality.

Description

technical field [0001] The present application relates to the technical field of iron and steel smelting, in particular to a method for preventing and controlling slag entrainment in high-speed thin slab continuous casting and low-carbon steel prepared by the method. Background technique [0002] In the late 1980s, the high-speed continuous casting and rolling production line was successfully put into operation in the United States because of its simplified production process, short production cycle, small footprint, low fixed capital investment, high metal yield, and good steel performance , less energy consumption, greatly reduced company capacity, good working conditions, easy automation and other advantages, so it has aroused widespread attention from people, and introduced and successfully put into production multiple production lines in China. [0003] Since the slab casting speed of thin slab continuous casting and rolling is significantly higher than that of conventi...

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Problems solved by technology

[0004] The invention provides a method for preventing and controlling slag entanglement in high-speed thin slab continuous casting, to solve or partially solve the technical problem that slag entanglement defects are easily generated when thin slabs are produced by high-speed continuous casting

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