Method for efficiently modifying low-carbon and ultra-low carbon steel continuous casting tundish slag

By adding aluminum-barium-based alloy to the intermediate enclosure slag in the continuous casting production of low-carbon and ultra-low carbon steel, the secondary oxidation problem of liquid steel caused by high iron oxide, manganese oxide and silicon oxide content in the intermediate enclosure slag is solved, and efficient modification of the intermediate enclosure slag and the improvement of the cleanliness of the intermediate enclosure slag is achieved.

CN119634692AActive Publication Date: 2025-03-18UNIV OF SCI & TECH BEIJING
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Patent Information

Application Number
CN202411851848.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-03-18
Estimated Expiration
2044-12-16

AI Technical Summary

Technical Problem

In the continuous casting of low-carbon and ultra-low carbon steel, the iron oxide, manganese oxide and silicon oxide content in the intermediate insulated slag is relatively high, resulting in secondary oxidation of the liquid steel and affecting the quality of the liquid steel. In the prior art, adding aluminum particles to the intermediate enclosure slag for modification has problems such as the generation of smoke and low yield.

Method used

When the total FeO and MnO content in the intermediate enclosure slag is greater than 2.5 wt%, an aluminum-barium-based alloy is added to the intermediate enclosure slag to achieve the modification of the intermediate enclosure slag. The aluminum content in the aluminum barium-based alloy is greater than 50 wt%, the barium content is greater than 8 wt%, the density is 3.0-5.5 g/cm3, and the particle size is 3.0-50 mm.

Benefits of technology

By using aluminium-barium-based alloy to modify the insulated slag, the content of iron oxide, manganese oxide and silicon oxide is reduced, the secondary oxidation of the molten steel is reduced, the cleanliness of the molten steel is improved, the fluidity and absorption capacity of the furnace slag are improved, and the incidence of surface defects of the cold-rolled sheet is reduced.

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an efficient modification method for low-carbon and ultra-low carbon steel continuous casting tundish slag, in low-carbon and ultra-low carbon steel continuous casting production, aluminum-barium-based alloy is adopted for tundish slag modification, the strong reducing capacity of aluminum and barium in the alloy is fully utilized, and the low-carbon and ultra-low carbon steel continuous casting production is achieved. The content of easily-reduced oxides such as iron oxide, manganese oxide and silicon oxide in the tundish slag is reduced, and secondary pollution of the easily-reduced oxides to the molten steel is controlled; meanwhile, after barium in the alloy reacts with the slag, the generated BaO product can remarkably reduce the viscosity of the slag, improve the fluidity of the slag, reduce the activity of Al2O3 in the slag and remarkably improve the capacity of the slag for absorbing Al2O3 inclusions in low-carbon steel and ultra-low carbon steel.
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