Production of Nitrogen-Alloyed Stainless Steels in Argon Oxygen Decarburization Converter: Kinetics and Modeling of Nitrogenation and Denitrogenation
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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12
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Steel Research International, Volume 95, issue 11
Abstract
The study aims to comprehend the behavior of nitrogen in the argon oxygen decarburization (AOD) process during the production of nitrogen-alloyed stainless steels, where the precise adjustment of nitrogen content plays a crucial role in enhancing productivity. Furthermore, the objective is to investigate the rate of change in nitrogen content when blowing a mixture of nitrogen and argon, instead of using pure nitrogen or argon alone. Hence, both nitrogenation and denitrogenation cases are examined, and kinetic models are developed. While solution thermodynamics can predict the final nitrogen content, the kinetics are influenced by the gas flow rate, steel temperature and composition, and levels of the surface active elements in the steel. By integrating a previously developed thermodynamic equilibrium equation with the kinetic models, nitrogen contents in the range of 0.150–0.400% can be reliably predicted. Consequently, the equations can be applied to predict nitrogen content during both the nitrogenation and denitrogenation stages in the reduction and desulfurization phases of the AOD process.Description
Funding Information: The authors express their gratitude to Outokumpu Stainless Steel AB, Avesta, for providing the opportunity to conduct test measurements. Special thanks go to the process and laboratory operators for their valuable assistance, positive attitude toward extra sampling, and willingness to tolerate any inconvenience caused. This research was conducted without external funding. The authors gratefully acknowledge the open access funding provided by Aalto University. Publisher Copyright: © 2023 The Authors. Steel Research International published by Wiley-VCH GmbH.
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Pitkälä, J, Holappa, L & Jokilaakso, A 2024, 'Production of Nitrogen-Alloyed Stainless Steels in Argon Oxygen Decarburization Converter: Kinetics and Modeling of Nitrogenation and Denitrogenation', Steel Research International, vol. 95, no. 11, 2300597. https://doi.org/10.1002/srin.202300597