Kinetics of Nitrogen Desorption from Liquid Iron with Low Nitrogen Content under Reduced Pressures

Harashima, Kazuumi; Mizoguchi, Shozo; Kajioka, Hiroyuki; Sakakura, Katsutoshi

doi:10.2355/tetsutohagane1955.73.11_1559

Cited by 26 publications

(14 citation statements)

References 8 publications

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“…The rate constant of nitrogen dissociation largely decreases by the increase of Cu and Sn contents, and the effect of these elements may be apparently represented by a site-blockage model, 6,8,9,[22][23][24][25][26] which is well known as a model used to explain the effect of surface active elements, such as oxygen and sulfur. Then, the site-blockage model is tried to apply to represent the variation of nitrogen rate constant with the addition of Cu and Sn.…”

Section: Analysis On the Basis Of Site-blockage Modelmentioning

confidence: 99%

Effects of Cu, Sn and W on the Rate of Nitrogen Dissociation on the Surface of Molten Iron

et al. 2006

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The effects of Cu, Sn and W on the rate of nitrogen dissociation on the surface of molten iron have been investigated at 1 973 K by an isotope exchange method. The rate constant of nitrogen dissociation increases with increasing the content of W. On the other hand, the rate constant decreases with increasing the Cu and Sn contents. These effects of the alloying elements on the rate of nitrogen dissociation depend on the affinity of the solute element with nitrogen in molten iron. The elements which have stronger affinity with nitrogen than iron have a stronger effect of enhancing the nitrogen dissociation rate, and those which have stronger repulsive force against nitrogen have a stronger effect of retarding the nitrogen dissociation. The effect of the alloying elements on the rate of nitrogen dissociation is investigated based on a model proposed from the analysis on the basis of surface concentration of the solute. This model can reasonably represent the variation of the rate constant of nitrogen dissociation with the W content.

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Section: Analysis On the Basis Of Site-blockage Modelmentioning

confidence: 99%

Effects of Cu, Sn and W on the Rate of Nitrogen Dissociation on the Surface of Molten Iron

et al. 2006

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“…[8][9][10] Many studies have also been reported on measurement method of nitrogen removal. [11][12][13][14][15][16][17][18] The present authors previously performed CaO powder top blowing experiments to remove sulfur and nitrogen from molten steel, examined increase of nitrogen removal rate constant due to activity changes in sulfur and oxygen resulting from reaction between CaO powder and melt, and confirmed that the same phenomenon occurred at the comparatively large scale (1 500 kg) experiments as well as the small scale experiments mentioned above. 19) And it was found out that powder compositions affected nitrogen removal rate through the change in oxygen activity due to the change in alumina activity in the powder.…”

Section: Introductionmentioning

confidence: 63%

Effect of Changes in Sulfur and Oxygen Concentration on Change in Nitrogen Concentration in Liquid Steel during CaO^|^ndash;CaSi Powder Blowing under Reduced Pressure

Numata¹,

Higuchi²

2012

ISIJ Int.

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In this paper, 1 500 kg scale experiments of CaSi mixed CaO powder top blowing onto the Al killed steel were carried out under reduced pressure. And the effects of CaSi alloy ratio in the mixture on reactions of desulfurization and nitrogen removal were examined. Aluminum decreasing rate decreased and rate constant of desulfurization and nitrogen removal increased with increasing CaSi mixing ratio to flux. It is supposed from the above that deoxidation and desulfurization reaction can simultaneously occur by blowing the mixture of CaSi and CaO powder and the effect of calcium mixing powder on desulfurization can be explained by promotion of CaO desulfurization and CaS formation. It is suggested that lower oxygen and sulfur activity due to reaction between molten steel and powder with CaSi increased rate constant of nitrogen removal.

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“…Here, the distance from the upper side of the crucible to molten steel surface was applied as the δ value 11) estimated approximately as 0.035 m.…”

Section: Discussionmentioning

confidence: 99%

“…According to the three researches, [15][16][17] the formulae for the rate constants of the chemical reaction at the gas/ liquid interface are suggested as follows accounting for the surface-active elements: 16) where [%O] is the oxygen content (mass%), and [%S] is the sulfur content (mass%). In present work, the oxygen content of the tested steel was below 0.008 mass%.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2016

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Kinetics of Nitrogen Desorption from Liquid Iron with Low Nitrogen Content under Reduced Pressures

Cited by 26 publications

References 8 publications

Effects of Cu, Sn and W on the Rate of Nitrogen Dissociation on the Surface of Molten Iron

Effects of Cu, Sn and W on the Rate of Nitrogen Dissociation on the Surface of Molten Iron

Effect of Changes in Sulfur and Oxygen Concentration on Change in Nitrogen Concentration in Liquid Steel during CaO^|^ndash;CaSi Powder Blowing under Reduced Pressure

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

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