Rates of Nitrogen and Carbon Removal from Liquid Iron in Low Content Region under Reduced Pressures.

Harashima, Kazuumi; Mizoguchi, Shozo; Matsuo, Munetsugu; Kiyose, Akihito

doi:10.2355/isijinternational.32.111

Cited by 39 publications

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“…17) Effect of S on the activity coefficients and density were ignored because content of S considered in the present study is low. K S ( = 40 at 1 873 K) was taken from Sekino et al, 24) which is close agreement with a report by Harashima et al 25) and Nagasaka and Fruehan.…”

Section: )supporting

confidence: 79%

Evaporation of S from Liquid Fe–C–S Alloy

Kang

Tafwidli

2018

ISIJ Int.

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Section: )supporting

confidence: 79%

Evaporation of S from Liquid Fe–C–S Alloy

Kang

Tafwidli

2018

ISIJ Int.

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“…Harashimaet al 4,7) reported that the decarburization rate decreases with the increase of sulphur content in the carbon content range of 10 to 200 ppm. Figure (d=0,15m, T=1 873 K.…”

Section: Effect Of [S]mentioning

confidence: 99%

Decarburization Reaction in Ultra-low Carbon Iron Melt under Reduced Pressure.

et al. 1993

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The kinetics of the decarburization reaction with dissolved oxygen in a liquid iron in the ultra-low carbon concenttation range under reduced pressure have been studied, using an induction furnace with a 20kg melt, The results obtained are as follows:(1 ) The decarburization reaction proceeds to less than 5ppm of carbon, and the decarburization rate constant, K, decreases as the carbon content decreases. (2) As the pressure in the chamberdecreases, the decarburization rate increases with a carbon content of more than 10 ppm. On the other hand, the dependencyof decarburization rate on the pressure in the chamber is small, with less than 10ppm of carbon. The influence of the sulphur content on the decarburization rate is small with a carbon content of more than IOppm. The decarburization rates are not affected by the mass transfer of CO in the gas phase under experimental conditions. Thus, it is concluded that the decarburization rate is controlled by the mass transfer of carbon in liquid iron. (4) The fact that the decarburization rate at a carbon content of more than 10ppm is affected by the total pressure of the chamberhas been explained by the change in interfacial area of the reaction between the gas and liquid phases resulting from CO boiling in the bulk melt. (5) The decrease in the decarburization rate in the ultra-low carbon concentfation range in RH is also caused by the decrease in interfacia[ area of the reaction between the gas and liquid phases.KEY WORDS: kinetics; decarburization; molten iron; ultra-low carbon steel; RH degassing. Metal samples were taken by quartz tubes for analysis of [C] and [O]. Other compositions ([Si], [Mn], [P] and [S]) were analyzed and were found to be constant during experiments. The analytical method of carbon was combustion-infrared absorptiometry by electro resistance furnace. Type EMIA-U511 was used for this analysis. Samples were always cleaned by electropolishing before the analysis. Sucrose (C12H22011) was used as a standard reagent. In this paper, taking into account the accuracy of analysis of carbon, the decarburization reaction with a carbon content of more than 5 ppm will be discussed.Other experimental conditions are shown in Table 1. In some experiments, Ar gas was blown onto the melt surface. In other experiment. Ar gas bubbling i•nto the melt was performed. 1O ppm).of the melt was observed at all the surface of the melt, as shown in Fig. 2a). When carbon content decreased by 20~~O ppm, the evolution of CO bubbles was observed only at the interface between the crucible and the melt (Fig. 2b)). When carbon content decreased by less than lOppm (approximately lOmin after the start), the evolution of CO bubbles was not observed and hence, the surface of the melt became quiet (Fig. 2c)) . Figure 3 shows the typical changes in [C] and [O] (Fig. 2b)). At [C]

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“…[1][2][3][4][5][6][7][8][9] Therefore, in order to know the maximum rate of nitrogen removal in steelmaking processes, it is important to understand the reaction mechanism of the interfacial chemical reaction of nitrogen gas with molten iron and the effect of surface active elements on the reaction.…”

Section: Introductionmentioning

confidence: 99%

Interfacial Kinetics of Nitrogen with Molten Iron Containing Sulfur.

Morita

2003

ISIJ International

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Rates of Nitrogen and Carbon Removal from Liquid Iron in Low Content Region under Reduced Pressures.

Cited by 39 publications

References 0 publications

Evaporation of S from Liquid Fe–C–S Alloy

Evaporation of S from Liquid Fe–C–S Alloy

Decarburization Reaction in Ultra-low Carbon Iron Melt under Reduced Pressure.

Interfacial Kinetics of Nitrogen with Molten Iron Containing Sulfur.

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