On the Deoxidation of Liquid Iron with Argon-Calcium Bubbles

Kobayashi, Sohei; Omori, Yasuo; Sanbongi, Koji

doi:10.2355/tetsutohagane1955.56.8_998

Cited by 18 publications

(16 citation statements)

References 1 publication

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“…Other authors have also reported deoxidation equilibria in this system. [32,39,40] Results of Kato et al [41] for the Fe-Ba-O system are shown in Figure 7. Measurements were made under Ar in CaO crucibles in the presence of BaO.…”

Section: Fe-mg-o Fe-ca-o and Fe-ba-o Systemsmentioning

confidence: 92%

A thermodynamic model for deoxidation equilibria in steel

Jung

Decterov

Pelton

2004

Metall Mater Trans B

162

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For relatively dilute solutions of oxygen and a deoxidizer M (M ϭ Al, Cr, Ca, Mg, . . .) in molten Fe, a thermodynamic model is proposed wherein the dissolved species are associates as well as unassociated and atoms. At higher metal concentrations, a small amount of associates also form. Experimental deoxidation equilibria for 15 deoxidizers M are quantitatively reproduced at all temperatures, with only a constant, temperature-independent and composition-independent empirical parameter for the Gibbs energy of formation of each associate. The deoxidation behavior of Mg, Ca, and Ba is elucidated for the first time. The parameters are stored in a database, which can be used to predict complex deoxidation equilibria in multicomponent steels.

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Section: Fe-mg-o Fe-ca-o and Fe-ba-o Systemsmentioning

confidence: 92%

A thermodynamic model for deoxidation equilibria in steel

Jung

Decterov

Pelton

2004

Metall Mater Trans B

162

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“…Therefore, many studies of inclusion composition during the calcium treatment have been made, [1][2][3][4][5][6][7][8] especially on the equilibrium of calcium deoxidation and calcium desulfurization. 9,10) Since calcium vaporizes from the molten steel, the change in calcium content with time is influenced by the vaporization reaction during calcium treatment as well as after calcium treatment.…”

Section: Introductionmentioning

confidence: 99%

Change in Inclusion Composition during CaO Flux Powder Blowing under Reduced Pressure

Numata¹,

Higuchi²

2012

ISIJ Int.

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To examine the reaction mechanism of the variation of calcium content in inclusions and the molten steel and the effect of flux composition on the reaction, the variations of molten steel content and inclusion content during CaO, 60%CaO-40%CaF2 or 50%CaO-50%CaSi powder blowing onto the molten steel under reduced pressure were investigated with 15 kg scale experiments. From the experimental results, it was found that the inclusion composition was changed from Al2O3 to Al2O3-CaO by CaO flux that did not contain CaSi alloy, and that the reaction path of the inclusion composition was changed remarkably by CaSi alloy in CaO flux. From the experimental results and the chemical thermodynamic calculation, the effects of the flux and CaSi alloy on the change in composition of inclusion and melts were examined.

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“…The solubility of calcium and oxygen in molten iron was measured under Ar or H2 gas without molten slag. [2][3][4] Because the partial pressure of calcium vapor on liquid calcium is 1.8 atm at 1 873 K, calcium is difficult to dissolve into immiscible molten iron with calcium 5) and is easy to vaporize from the free surface of molten iron. Suito et al 6) measured aluminum, calcium and oxygen concentrations in molten iron deoxidized by aluminum in Al2O3 crucibles with and without CaO-Al2O3 slag.…”

Section: Introductionmentioning

confidence: 99%

Solubility of Calcium and Oxygen in Molten Iron Equilibrated with Slag in CaO, Al2O3 or CaO-stabilized ZrO2 Crucible at 1873 K

et al. 2011

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The solubility of calcium and oxygen in molten iron equilibrated with CaO-Al2O3-ZrO2 molten slag in CaO, Al2O3 or 5.5 mass% CaO-stabilized ZrO2 crucible at 1 873 K was measured by means of the slagmetal equilibrium partition method under Ar gas atmosphere. From the results by XRD and the phase diagram of CaO-Al2O3-ZrO2 system, the slag in a CaO crucible was in equilibrium with CaO·ZrO2 and CaO and the slag composition was 57.36 mass% CaO-34.86% Al2O3-7.78% ZrO2. The slag in a Al2O3 crucible was in equilibrium with CaO·2Al2O3 and ZrO2-CaO solid solution (Css) and the slag composition was 27.08 mass% CaO-53.42% Al2O3-19.50% ZrO2. The slag in a CaO-stabilized ZrO2 crucible was in equilibrium with ZrO2-CaO solid solution (Css) and CaO·ZrO2 and the slag composition was 30.38 mass% CaO-51.56% Al2O3-18.06% ZrO2. The average concentrations of oxygen and calcium in molten iron in equilibrium with slag and compounds were 251 ppm and 3 ppm in a CaO crucible, 33 ppm and 4 ppm in an Al2O3 crucible and 21 ppm and 5 ppm in a CaO-stabilized ZrO2 crucible, respectively. The logarithm of equilibrium constant, logK, for the reaction of CaO(s) = Ca + O is -4.38 and the interaction parameter of eCa O is 31.8. The value is satisfied the thermodynamic phase stability.

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On the Deoxidation of Liquid Iron with Argon-Calcium Bubbles

Cited by 18 publications

References 1 publication

A thermodynamic model for deoxidation equilibria in steel

A thermodynamic model for deoxidation equilibria in steel

Change in Inclusion Composition during CaO Flux Powder Blowing under Reduced Pressure

Solubility of Calcium and Oxygen in Molten Iron Equilibrated with Slag in CaO, Al2O3 or CaO-stabilized ZrO2 Crucible at 1873 K

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