Molten steel composite deoxidation method good for improving pouring

Abstract

The invention belongs to the category of metallurgy and steelmaking processes, and particularly relates to a molten steel composite deoxidation method good for improving pouring, which is applicable to smelting of gear steel, non-quenched and tempered steel and constructional steel as well as high-titanium solder wire series steel, wherein a silicon barium alloy is fed into the deep part of molten steel through a core-spun yarn to complete the composite deoxidation of the molten steel, a core wire in the core-spun yarn comprises the components of 48%-58% of silicon, 25%-32% of barium and the balance of iron according to weight percentage. The method has the advantages that the deoxidation effect of the molten steel is enhanced and the consumption of an aluminum alloy in the deoxidation of the molten steel is reduced through the regulation of alloy elements; meanwhile, the purity of molten steel and the quality of the molten steel are remarkably improved, an occluded foreign substance in the molten steel is effectively promoted to be gathered and float upwards to the slag, the smoothness of multi-furnace sequence casting production is guaranteed, the cleanliness of the molten steel is increased, the smoothness of the continuous casting is guaranteed, the number of furnaces for sequence casting in continuous casting is improved, a continuous casting water gap is prevented from being blocked, and the consumption of deoxidation aluminum is reduced.

Description

technical field [0001] The invention belongs to the metallurgical steelmaking process category, and in particular relates to a method for improving the compound deoxidation of poured molten steel. Background technique [0002] Composition characteristics of gear steel, non-quenched and tempered steel and structural steel series produced by electric furnace, ladle refining (LF), vacuum degassing (VD) and bloom continuous casting processes, one of which is the composition of sulfur and aluminum in molten steel The content is relatively high, especially the steel types with S≥0.045%. During the pouring process, the nozzle is blocked, resulting in poor continuous pouring performance, resulting in abnormal final pouring and single-furnace pouring, which affects the smooth production and molten steel quality. Contents of the invention [0003] The object of the present invention is to provide a method for improving the composite deoxidation of poured molten steel ...

AI Technical Summary

Problems solved by technology

[0002] Composition characteristics of gear steel, non-quenched and tempered steel and structural steel series produced by electric furnace, ladle refining (LF), vacuum degassing (VD) and bloom continuous casting processes, one of which is the composition of sulfur and aluminum in molten steel The content is relatively high, especially the steel types with S≥0.045%. During the pouring process, the nozzle is blocked, resulting in poor continuous pouring performance, resulting in abnormal final pouring and single-furnace pouring, which affects the smooth production and the quality of molten steel

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