Method for producing liquid steel in an electric arc furnace with final decarburization

The method addresses high nitrogen and carbon issues in electric arc furnaces by controlling content through denitrogenation and decarburization, achieving low nitrogen and carbon levels in liquid steel for high-grade production.

WO2026115452A1PCT designated stage Publication Date: 2026-06-04ARCELORMITTAL SA
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ARCELORMITTAL SA
Filing Date
2025-11-26
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing methods for producing liquid steel in electric arc furnaces result in high nitrogen and carbon contents that are difficult to control, leading to inconsistent mechanical properties and impurities, which are not suitable for high-grade steel production.

Method used

A method involving targeted carbon and nitrogen content control through denitrogenation and final decarburization in an electric arc furnace, using oxygen injection and solid carbon material to achieve low nitrogen and carbon levels, maintaining oxygen content above 200 ppm by weight, and operating under slightly pressurized conditions to prevent recontamination.

Benefits of technology

Achieves low nitrogen and carbon contents in liquid steel, ensuring consistent mechanical properties and meeting high-grade steel requirements without vacuum processing.

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Abstract

Method for producing liquid steel in an electric arc furnace with final decarburization The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - melting a metal load in the electric arc furnace (2) for generating a steel bath (10); - denitrogenating the steel bath (10) to reach a nitrogen content %N below a targeted nitrogen content %Ntarg, wherein the carbon content %C remains greater than a targeted carbon content %Ctarg; - applying a final decarburization treatment to reach a carbon content %C ≤ %Ctarg, to reach an oxygen content %Op greater than 200 ppm, wherein oxygen is injected at a flow rate above 0.3 Nm3 / min / ton, the ambient air being at a pressure of above 90% of the atmospheric pressure; - tapping the steel bath (10), the oxygen content %Op reached by the final decarburization treatment being maintained up to the tapping.
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