A molten steel deoxidizing method

By using calcined coal of a specific particle size to be added in batches during the converter steelmaking process, the problems of violent reaction and inaccurate feeding in the carbonaceous deoxidation process were solved, achieving safe and stable deoxidation and high purity, and reducing smelting costs and quality fluctuations.

CN122279144APending Publication Date: 2026-06-26UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing carbonaceous deoxidation processes in converter steelmaking suffer from problems such as violent reactions and easy splashing, inaccurate control of feed amount, and limited cleanliness of molten steel, making it difficult to guarantee production safety and steel quality.

Method used

Calcined coal with a particle size of 2-5 mm is used as a carbonaceous deoxidizer. It is added to the surface of the molten steel in 2-3 batches. The addition time and position are controlled by combining the formulas for the amount of carbon required for deoxidation and the amount of carbon required for alloying, so as to ensure the stability and uniformity of the carbon-oxygen reaction.

Benefits of technology

This effectively avoids localized surges in carbon and oxygen concentrations, eliminates rapid rises in the molten pool surface and splashing of molten steel, achieves deep deoxidation and high cleanliness, and reduces smelting costs and quality fluctuations.

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Abstract

This invention belongs to the field of steel deoxidation technology, specifically a method for steel deoxidation, comprising the following steps: during the tapping process of a converter, when the molten steel reaches a preset position on the ladle, a carbonaceous deoxidizer is added to the surface of the molten steel in multiple batches for deoxidation; wherein the carbonaceous deoxidizer is calcined coal, and the particle size of the calcined coal is 2-5 mm. This invention, by selecting a specific carbon source with a specific particle size and adopting a strategy of adding it dynamically in batches, effectively avoids a surge in local carbon and oxygen concentration, fundamentally eliminating the rapid rise of the molten pool surface and steel splashing, thus ensuring production safety; by using calcined coal with specific purity and strength, its anti-pulverization ability and low impurity characteristics reduce the reaction runaway and oxide inclusion residues caused by secondary pulverization, significantly reducing smelting costs while ensuring high cleanliness and deoxidation efficiency.
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