China Baowu Steel Group has patented a method for smelting low nitrogen steel using a dual-shell electric furnace. This innovative approach alternates electric heating between two furnace shells, enhancing throughput, reducing smelting time, and minimizing environmental pollutants compared to traditional methods. GlobalData’s report on China Baowu Steel Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on China Baowu Steel Group, AI for workflow management was a key innovation area identified from patents. China Baowu Steel Group's grant share as of June 2024 was 69%. Grant share is based on the ratio of number of grants to total number of patents.
The patent US12018341B2 outlines a method for smelting low nitrogen steel using a dual-shell electric furnace. This innovative approach involves a sequential process where electric heating, feeding, sealing of the molten pool, and the introduction of a combustion medium and oxygen are performed alternately in two furnace shells. The method specifies that electric heating is conducted until the molten steel reaches a target temperature of 1,600-1,660°C, at which point heating is transferred to the other shell. The arc power system utilized is a direct current (DC) system, rated between 0.7 to 1 MW per ton of molten steel, and is equipped with a hollow argon blowing electrode to enhance the smelting process.
Further details of the method include the use of multiple blowing guns in each furnace shell for the combustion medium and oxygen, with specific flow rates outlined for optimal performance. The process also incorporates a decarburization phase, where oxygen is blown after an initial period of simultaneous combustion medium and oxygen introduction. Additionally, the method emphasizes the importance of controlling the oxygen blowing flow based on the carbon content of the molten steel, and it specifies the composition of the feed materials to achieve a final nitrogen content of less than 25 ppm. Overall, the claims present a comprehensive framework for efficiently producing low nitrogen steel while maintaining precise control over the smelting conditions.
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