Method for producing liquid steel in an electric arc furnace with carburization and oxygen injection

The method of carburization and oxygen injection in electric arc furnaces addresses high nitrogen content issues by controlling carbon and nitrogen levels, enhancing steel quality and metallurgical control.

WO2026115296A1PCT designated stage Publication Date: 2026-06-04ARCELORMITTAL SA
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
ARCELORMITTAL SA
Filing Date
2024-11-26
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing methods for producing liquid steel in electric arc furnaces result in high nitrogen content, which affects the quality of the steel, leading to inconsistent mechanical properties and poor cold formability, and there is no effective control over carbon content during the process.

Method used

A method involving carburization and oxygen injection in the electric arc furnace to control nitrogen content, where a targeted carbon amount is added to the steel bath, followed by oxygen injection to achieve the desired nitrogen levels, with optional dephosphorization steps to manage phosphorus content.

Benefits of technology

This method effectively reduces nitrogen content in liquid steel to acceptable levels, ensuring better metallurgical control and improved steel quality, while maintaining low oxygen content for efficient nitrogen removal.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure IB2024061844_04062026_PF_FP_ABST
    Figure IB2024061844_04062026_PF_FP_ABST
Patent Text Reader

Abstract

The invention relates to a method for producing liquid steel in an electric arc furnace (2) comprising successively: - defining a targeted nitrogen content wt. %Ntarg of the produced liquid steel, - introducing a metal load in the electric arc furnace (2) and - melting it for generating a steel bath (10) and a slag (12); - carburizing the steel bath (10) by adding a carbon amount equal to or greater than a minimum denitrogenation carbon amount CdeN said amount CdeN being defined as a function of the nitrogen content in excess to wt. %Ntarg at the beginning of the step (E4), - injecting a flow of oxygen to reach a nitrogen content wt. %N such that wt. %N ≤ wt. %Ntarg, - tapping the steel bath (10) to obtain the produced liquid steel.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Electric arc furnace steelmaking method based on biomass injection

    CN115449593A

  • Clean and rapid smelting method in an electric arc furnace with full scrap steel

    US20190048430A1