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

The method addresses high nitrogen content in electric arc furnace steel by carburizing and oxygen injection to control nitrogen and carbon levels, enhancing steel quality and mechanical properties.

WO2026115449A1PCT 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
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 content, which affects the mechanical properties and quality of the steel, and there is limited control over carbon content during the melting process, hindering the production of high-grade steel.

Method used

A method involving carburization and oxygen injection in the electric arc furnace to control nitrogen and carbon levels, including defining a targeted nitrogen content, carburizing the steel bath with a minimum amount of carbon, and injecting oxygen to achieve the desired nitrogen levels, followed by optional dephosphorization steps to enhance nitrogen removal.

Benefits of technology

The method effectively reduces nitrogen content in liquid steel to acceptable levels, ensuring better mechanical properties and quality, while maintaining controlled carbon levels, suitable for producing high-grade steel.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure IB2025062081_04062026_PF_FP_ABST
    Figure IB2025062081_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