Influences of Basicity and Li2O on the Properties of Fluorine-Free Mold Flux for the Casting of Medium Carbon Steels

Wang, Wanlin; Xiong, Yongmin; Zhou, Lejun; Xie, Senlin; Huang, Daoyuan

doi:10.1007/s11663-016-0597-x

Cited by 37 publications

(19 citation statements)

References 21 publications

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“…For the melting and the phosphorus distribution behavior measurement, the SHTT was utilized, and the schematic apparatus is shown in Figure . The slag powders were first mounted on the thermocouple, which was heated to 1600 °C at the rate of 15 °C s −1 and held for 300 s. Then, the molten slag was cooled down rapidly to 1350 °C for isothermal crystallization for 60 min. After that, the sample was quenched by turn off the power, when the holding time reached target value.…”

Section: Methodsmentioning

confidence: 99%

Effect of Al₂O₃ on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO₂–Fe₂O₃–P₂O₅ Slag System

Xie

Wang

Pan

et al. 2018

steel research int.

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An investigation is conducted to study the effect of Al2O3 on the melting, viscosity, and phosphorus distribution of CaO–SiO2–Fe2O3–P2O5 slag system by using Single Hot Thermocouple Technique and rotating cylinder viscometer. The results show that with the addition of Al2O3 content, the melting temperature range of slag system is first reduced and then increased, as the added Al2O3 may react with CaO to form different compounds with varied melting points. The slag viscosity increases with the addition of Al2O3 content, due to the fact that the polymerization degree of the melt slag is getting increased. Besides, the addition of Al2O3 can improve the mass percentage of P2O5 in the solid phase, but it may reduce the dephosphorization capacity of the slag due to the reduction of the total solid phase solution (2CaO · SiO2–n3CaO · P2O5) precipitation. The results of this study can elucidate the effect of Al2O3 on the property of dephosphorization slag and provide guidelines for the new slag design to achieve a better hot metal dephosphorization efficiency.

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Section: Methodsmentioning

confidence: 99%

Effect of Al₂O₃ on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO₂–Fe₂O₃–P₂O₅ Slag System

Xie

Wang

Pan

et al. 2018

steel research int.

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“…Flow temperature is defined as the temperature at which the height of slag column became ¼ of the height of the original slag column in the silicon-molybdenum electric furnace in the heating process. Some researchers [3,20] believed that the flow temperature is approximately equivalent to the liquidus temperature at which mold fluxes are completely melted.…”

Section: Methodsmentioning

confidence: 99%

“…Controlling the heat transfer from the shell to the mold can solve this problem [3]. Presently, the main method involves regulating the crystallization behavior of mold fluxes, such as increasing the basicity of mold fluxes to produce many crystals that control the horizontal heat transfer over the meniscus region.…”

Section: Introductionmentioning

confidence: 99%

Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al2O3-SiO2-Na2O-CaF2 Slags

Wen

Ding

et al. 2018

Materials

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How to coordinate the contradiction between lubrication and heat transfer in the peritectic steel casting process is the key technical difficulty in preparing mold fluxes. The mold fluxes that are required for casting are subjected to the shear stress generated by mold oscillation and slab movement, which affects the crystallization performance of slags. The quantitative effect of slags’ crystallization performance by shear stress is studied to develop a low-basicity and high-crystallization mold flux to solve the above problem. The results show that the crystallization kinetic condition is promoted, and the crystallization activation energy is reduced by the shear stress, which leads to an increase in the crystallization temperature. Concurrently, the crystal size is reduced. However, the shear stress has no effect on the crystalline phase. The influence of different shear stresses on the crystallization ability of molten slags is related to the crystal nucleation and growth mechanisms. The crystalline fraction of the slag films at 300 rpm (69 s−1) is 44.7%, which is an increase of 17.7% compared with the crystalline fraction of the slag films at 200 rpm (46 s−1). Moreover, the shear stress has little effect on the lubricating properties of the mold fluxes, although the crystallization ability is promoted by the agitation.

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“…Many authors have used the DHTT equipment to characterize the melting [6][7][8][9] and crystallization behaviors of different slags via TTT and/or CCT diagrams. [6,7,[9][10][11][12][13][14] Furthermore, this device is used to observe the crystallization that occurs when the slag is exposed to selected temperature gradients [3,15,16] and to investigate the effect of water vapor.…”

Section: Introductionmentioning

confidence: 99%

Modified DHTT Equipment for Crystallization Studies of Mold Slags

Kölbl

Harmuth

Marschall

2018

Metall Mater Trans B

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The double hot thermocouple technique (DHTT) enables simulations of the temperature gradient at near-service conditions during continuous casting of steel. With the equipment applied so far, a rectangular slag film of even thickness often cannot be achieved. Further, the minimum temperature frequently lies within the slag film. Modified equipment can avoid these disadvantages via the following design features. The entire furnace chamber is heated to the selected temperature of the cold wire, and the minimum temperature is not located within the slag film. Furthermore, the shape of the heating wire is improved, which enables mounting of a thin, rectangular slag film between four platinum wires. This modification allows for investigations on transparent and translucent slags. So far, the results from DHTT investigations were represented via snapshots of the samples at certain experimental times. Therefore, appropriate methods for the graphical representation of the results were suggested: the maximum crystallinity, the time related to certain crystallinities with a dependence on the position within the slag film, and the crystal growth rate. The CaO-MgO-Al 2 O 3 -SiO 2 slag investigated with this equipment was mineralogically examined additionally, and based on thermodynamic calculations, the allocation of temperatures to certain positions within the crystallized slag film was possible.

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Influences of Basicity and Li2O on the Properties of Fluorine-Free Mold Flux for the Casting of Medium Carbon Steels

Cited by 37 publications

References 21 publications

Effect of Al₂O₃ on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO₂–Fe₂O₃–P₂O₅ Slag System

Effect of Al₂O₃ on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO₂–Fe₂O₃–P₂O₅ Slag System

Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al2O3-SiO2-Na2O-CaF2 Slags

Modified DHTT Equipment for Crystallization Studies of Mold Slags

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Influences of Basicity and Li2O on the Properties of Fluorine-Free Mold Flux for the Casting of Medium Carbon Steels

Cited by 37 publications

References 21 publications

Effect of Al2O3 on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO2–Fe2O3–P2O5 Slag System

Effect of Al2O3 on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO2–Fe2O3–P2O5 Slag System

Effect of Shear Stress on Isothermal Crystallization Behavior of CaO-Al2O3-SiO2-Na2O-CaF2 Slags

Modified DHTT Equipment for Crystallization Studies of Mold Slags

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Product

Resources

About

Effect of Al₂O₃ on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO₂–Fe₂O₃–P₂O₅ Slag System

Effect of Al₂O₃ on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO₂–Fe₂O₃–P₂O₅ Slag System