Kinetics of Nitrogen Absorption and Desorption in High-Cr Molten Steel under Pressurized Atmosphere

Takahashi, Fumio; Momoi, Yoshikazu; Kawasaki, Koji; Oikawa, Katsunari

doi:10.2355/isijinternational.isijint-2016-202

Cited by 9 publications

(1 citation statement)

References 9 publications

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“…Moreover, these differences in critical mass percentages were observed to be more pronounced in the limiting steps of nitrogen desorption and absorption. Besides, as the denitrification reaction conditions change, the limiting steps could be the interfacial chemical reaction, nitrogen mass transfer in liquid steel, or both [7][8][9][10][11]. Furthermore, previous studies [12][13][14] on denitrification and nitrogen absorption in liquid steel primarily focused on steel with a nitrogen content of 30 ppm or more (hereafter, referred to as common-nitrogen steel).…”

Section: Introductionmentioning

confidence: 99%

Vacuum denitrification and nitrogen absorption of molten steel under ultra-low nitrogen conditions

Wang

et al. 2019

Materials Science and Technology

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Vacuum smelting experiments were conducted to investigate the effects of different initial nitrogen content and surface active elements on nitrogen denitrification and nitrogen absorption in molten steel. Thermodynamic calculations show that the pressure corresponding to 10 ppm of [N] should be less than 45 Pa; at 30 Pa and 1600°C, the nitrogen content in the steel reduced from 18 to 10 ppm in 50 min. Furthermore, denitrification can be described as a 1.5th order reaction model. In addition, the mean parameters of nitrogen absorption between the ultra-low and common-nitrogen steels are different: for ultra-low nitrogen molten steel exposed to air, even if [S] ≥ 200 ppm and [O] ≥ 300 ppm, [N] can increase from 10 to over 40 ppm in 20 min.

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Section: Introductionmentioning

confidence: 99%

Vacuum denitrification and nitrogen absorption of molten steel under ultra-low nitrogen conditions

Wang

et al. 2019

Materials Science and Technology

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Production of Nitrogen‐Alloyed Stainless Steels in Argon Oxygen Decarburization Converter: Kinetics and Modeling of Nitrogenation and Denitrogenation

Pitkälä,

Holappa,

Jokilaakso

2023

steel research int.

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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.

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Effect of Revert Addition on the Nitrogen Removal From Liquid Superalloy During Vacuum Induction Melting Process: Experimental and Simulation Studies

Zhao,

Gao,

Yang

et al. 2023

Metall Mater Trans B

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Kinetics of Nitrogen Absorption and Desorption in High-Cr Molten Steel under Pressurized Atmosphere

Cited by 9 publications

References 9 publications

Vacuum denitrification and nitrogen absorption of molten steel under ultra-low nitrogen conditions

Vacuum denitrification and nitrogen absorption of molten steel under ultra-low nitrogen conditions

Production of Nitrogen‐Alloyed Stainless Steels in Argon Oxygen Decarburization Converter: Kinetics and Modeling of Nitrogenation and Denitrogenation

Effect of Revert Addition on the Nitrogen Removal From Liquid Superalloy During Vacuum Induction Melting Process: Experimental and Simulation Studies

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