Interfacial Reaction Between CaO-SiO2-MgO-Al2O3 Flux and Fe-xMn-yAl (x = 10 and 20 mass pct, y = 1, 3, and 6 mass pct) Steel at 1873 K (1600 °C)

Kim, Dong Jin; Park, Joo Hyun

doi:10.1007/s11663-012-9667-x

Cited by 63 publications

(27 citation statements)

References 52 publications

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“…Besides, in industrial practice, the present authors found many (Mn, Mg)O·Al 2 O 3 spinel inclusions in medium Mn steel during secondary refining process. In fact, this kind of inclusions is seldom reported, 33,34) and their formation mechanism is not clear as well. Therefore, some investigations need to be conducted to clarify the behavior of non-metallic inclusions in medium Mn steel.…”

Section: Introductionmentioning

confidence: 97%

Formation and Evolution of Non-metallic Inclusions in Medium Mn Steel during Secondary Refining Process

2017

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Section: Introductionmentioning

confidence: 97%

Formation and Evolution of Non-metallic Inclusions in Medium Mn Steel during Secondary Refining Process

2017

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“…[3][4][5] However, a range of issues with the poor casting performance are found during casting process due to the interfacial reaction between molten steel and mold flux, which changes slag composition and deteriorates lubrication and heat transfer between solidifying shell and mold, inducing severe depressions, cracks, and even breakout. [6][7][8][9] Recent studies focusing on the reaction mechanism between the conventional CaO-SiO 2 type mold flux and molten steel with high contents of Mn and Al have noted that the concentration of Al in the steel has the most significant influence on the interfacial reaction, resulting in the Al 2 O 3 accumulation in the mold flux. 6,10,11) Therefore, intensive trials and optimizations have been carried out to cope with this problem through the addition of fluxing…”

Section: Introductionmentioning

confidence: 99%

“…[6][7][8][9] Recent studies focusing on the reaction mechanism between the conventional CaO-SiO 2 type mold flux and molten steel with high contents of Mn and Al have noted that the concentration of Al in the steel has the most significant influence on the interfacial reaction, resulting in the Al 2 O 3 accumulation in the mold flux. 6,10,11) Therefore, intensive trials and optimizations have been carried out to cope with this problem through the addition of fluxing…”

Section: Introductionmentioning

confidence: 99%

Evolution of Compositions and Properties of CaO–SiO<sub>2</sub> Based Mold Flux for Continuous Casting High Mn Steel

Yang

Zhu

2016

ISIJ Int.

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“…(5) In the present study, the activity coefficients of oxide components CaO, MnO and SiO2 was calculated using a commercial thermochemical computing software, FactSage TM 6.2 with 'FToxid' database, which has been successfully applied in computation of thermochemical properties of multicomponent oxide melts. 5,6,8,[13][14][15][16][17][18][19][20][21][22][23] Especially, the thermodynamic database for the CaO-SiO2-MnO system was fully optimized by Kang et al 24) Also, from the previous works by the present author, 5,6,8,18,19) the activity calculation in the present CaO-SiO2-MnO system was in good consistency with other thermochemical properties such as carbide capacity, sulfide capacity, etc.…”

mentioning

confidence: 63%

Sulfide Capacity and Excess Free Energy of CaO^|^ndash;SiO2^|^ndash;MnO Slag Derived from Structural Analysis of Raman Spectra

Park

2012

ISIJ Int.

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KEY WORDS: silicate structure; Raman spectroscopy; sulfide capacity; excess free energy of mixing; Q 3 /Q 2 ratio; degree of polymerization; free oxygen; bridging oxygen; non-bridging oxygen.In a previous article, 1) the structure of molten CaO-SiO 2 -MnO slag was systematically analyzed using micro-Raman spectroscopic data obtained from a melt-quenched glass samples. Various thermophysical properties such as viscosity, density (molar volume), and electrical conductivity (resistivity) of the CaO-SiO 2 -MnO slag was strongly dependent of a degree of polymerization defined as Q 3 /Q 2 ratio. Furthermore, the speciation of free oxygen, bridging oxygen and non-bridging oxygen was also quantitatively derived from a novel approach based on a mass balance of oxygen and silicon atoms in discrete silicate anionic units, viz. Q n (n = 0, 1, 2, and 3). In the present note, the thermochemical properties such as sulfide capacity and excess free energy of mixing of oxide components which are important properties in metallurgical slags are evaluated using a concentration of free oxygen as well as a degree of polymerization of silicate melts, i.e. Q 3 /Q 2 ratio. The capability of molten slags absorbing sulfide ions is quantified as the sulfide capacity ( ) which is given in Eq. (2) where K (1) , , , , and p i indicate, respectively, the equilibrium constant of Eq. (1), the activity, mole fraction and activity coefficient of free oxygen ions as a reference to Raoultian standard state, the Henrian activity coefficient of sulfide ions, and the partial pressure of gaseous component i. Hence, the log will be directly proportional to the log , if the second term in Eq. (3) would not be significantly changed by silicate composition at a fixed temperature.The sulfide capacity of the CaO-SiO 2 -MnO slag measured by Abraham et al. 4) and Park et al. 5,6) is shown in Fig. 1 as a function of the concentration of free oxygen ions obtained in previous study. 1) Here, the relationship between the sulfide capacity and the content of free oxygen in the CaO-SiO 2 binary slag at 1 773 and 1 923 K is also compared.7) There is a good linear relationship with a slope of about 0.9 which is close to the ideal value of unity from Eq. (3) between log and log as given in Eq. (4) However, the sulfide capacity of the CaO-SiO2 binary slag at 1 923 K is above Eq. (4) at a given O 2-content, which probably results from the effect of temperature not only on the value of K(1) but also on the ratio. Consequently, it is concluded that the sulfur dissolution behavior into the silicate melts at high temperatures can be understood more quantitatively by considering not only the effect of concentration (or activity) of free oxygen ions, viz. basicity but also the effect of structural modification behaviour on the stability of oxygen and sulfide ions in silicate melts. 5,6,8) In previous works of the present author, 1,5,6,8) it was found that, in the relatively acidic region of which silica content is greater than about 30(±5) mass%, the large amounts of Ca 2+ ion...

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Interfacial Reaction Between CaO-SiO2-MgO-Al2O3 Flux and Fe-xMn-yAl (x = 10 and 20 mass pct, y = 1, 3, and 6 mass pct) Steel at 1873 K (1600 °C)

Cited by 63 publications

References 52 publications

Formation and Evolution of Non-metallic Inclusions in Medium Mn Steel during Secondary Refining Process

Formation and Evolution of Non-metallic Inclusions in Medium Mn Steel during Secondary Refining Process

Evolution of Compositions and Properties of CaO–SiO<sub>2</sub> Based Mold Flux for Continuous Casting High Mn Steel

Sulfide Capacity and Excess Free Energy of CaO^|^ndash;SiO2^|^ndash;MnO Slag Derived from Structural Analysis of Raman Spectra

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