Improvement of the Initial Stage of Solidification by Using Mild Cooling Mold Powder.

Kawamoto, Masayuki; Tsukaguchi, Yuichi; Nishida, Norihiro; Kanazawa, Takashi; Hiraki, Sei

doi:10.2355/isijinternational.37.134

Cited by 70 publications

(53 citation statements)

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“…A crystalline layer in slag film yields larger thermal resistance by producing air gap at the flux/mold interface and scattering infrared radiation from steel. [3][4][5][6][7][8] The authors have focused on the compound, cuspidine (3CaO · 2SiO 2 · CaF 2 ), which crystallizes in the crystalline layer in flux films. [9][10][11] Since cuspidine primarily crystallizes in almost all of commercial mold fluxes, controlling the crystallinity is a key factor to control the horizontal heat flux.…”

Section: Introductionmentioning

confidence: 99%

Stability of Cuspidine (3CaO 2SiO2 CaF2) and Phase Relations in the CaO-SiO2-CaF2 System.

2002

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Primary crystallization field of cuspidine (3CaO · 2SiO 2 · CaF 2 ) has been experimentally determined in the 2CaO · SiO 2 -SiO 2 -CaF 2 system by quenching method and differential thermal analysis (DTA). Hermetically closed platinum capsules were used as a sample container to prevent fluorine loss in the form of HF and SiF 4 by reaction of CaF 2 with moisture or SiO 2 for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO-SiO 2 -CaF 2 system has been developed. Cuspidine equilibrates with (2CaO · SiO 2 ) 2 CaF 2 , CaO · SiO 2 , 3CaO · 2SiO 2 , 2CaO · SiO 2 and CaF 2 in solid state. Cuspidine coexists with liquid phases at temperatures between 1 387 K and 1 680 K.

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Section: Introductionmentioning

confidence: 99%

Stability of Cuspidine (3CaO 2SiO2 CaF2) and Phase Relations in the CaO-SiO2-CaF2 System.

2002

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“…23) The mould fluxes were prepared by melting pre-mixed reagent grade CaCO 3 2 O were determined by inductively coupled plasma (ICP) analysis, and other components were analysed by X-ray fluoroscopy (XRF).…”

Section: Materials Preparationmentioning

confidence: 99%

“…The suppression of heat flux can be achieved by applying mould fluxes with high crystallisation tendency and, accordingly, thick crystalline layer [2][3][4][5][6] due to the scattering effect on thermal radiation at the grain boundaries. [7][8][9][10] Heat transfer is also suppressed by the formation of high thermal resistance pores, cracks and air gaps in the wake of the shrinkage of crystalline layer.…”

Section: Introductionmentioning

confidence: 99%

In-situ Study of Crystallisation Behaviour of CaO–SiO2–Na2O–B2O3–TiO2–Al2O3–MgO–Li2O Fluorine-free Mould Fluxes with Different CaO/SiO2 Ratios

et al. 2016

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The increasing environmental concern for the fluorine emission in steel continuous casting makes the development of fluorine-free mould fluxes imperative. The main challenge in the development of fluorinefree mould fluxes is controlling heat transfer rate which is closely related to the crystallisation behaviour of mould fluxes. In this study, the crystallisation behaviour of CaO-SiO 2 -Na 2 O-B 2 O 3 -TiO 2 -Al 2 O 3 -MgO-Li 2 O fluorine-free mould fluxes with CaO/SiO 2 mass ratios from 0.9 to 1.2 was examined using single hot thermocouple technique (SHTT) and double hot thermocouple technique (DHTT). Continuous cooling transformation (CCT) and time-temperature transformation (TTT) diagrams developed using SHTT showed that the crystallisation temperature increased and the incubation time decreased with the increase of CaO/SiO 2 ratio. DHTT was used to simulate the temperature gradient between copper mould and strand in steel continuous casting. Analysis of the crystallinity evolution in the simulated temperature field showed an increased crystallinity of fluxes with the increase of the CaO/SiO 2 ratio at certain times. The crystal phases and crystal morphologies formed in different conditions were analysed by X-ray diffraction (XRD), scanning electron microscope (SEM), and X-ray energy dispersive spectroscopy (EDS

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“…It is reported that the radiative heat transfer, as one of the two heat transfer ways in the mold, contributes 20-50% to the total heat transfer from the steel shell to the mold. [1][2][3] In the research of flux film and infrared glass, it was found that the addition of transition metal oxides such as MnO, FeO, Cr 2 O 3 , NiO etc. could increase infrared absorption coefficient of flux film and decrease infrared radiometric force.…”

Section: Introductionmentioning

confidence: 99%

Radiative Heat Transfer in Transition Metal Oxides contained in Mold Fluxes

et al. 2009

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Improvement of the Initial Stage of Solidification by Using Mild Cooling Mold Powder.

Cited by 70 publications

References 0 publications

Stability of Cuspidine (3CaO 2SiO2 CaF2) and Phase Relations in the CaO-SiO2-CaF2 System.

Stability of Cuspidine (3CaO 2SiO2 CaF2) and Phase Relations in the CaO-SiO2-CaF2 System.

<i>In-situ</i> Study of Crystallisation Behaviour of CaO–SiO<sub>2</sub>–Na<sub>2</sub>O–B<sub>2</sub>O<sub>3</sub>–TiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub>–MgO–Li<sub>2</sub>O Fluorine-free Mould Fluxes with Different CaO/SiO<sub>2</sub> Ratios

Radiative Heat Transfer in Transition Metal Oxides contained in Mold Fluxes

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