ISSN 2594-5300
35º Seminário de Fusão, Refino e Solidificação dos Metais e 5º Seminário de Fundição — vol. 35, num.35 (2004)
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Abstract
The knowledge of the physical and chemical properties as well as the behaviour of the mould fluxes during melting are important in order to improve continuous casting operations. Lubrication and control of heat transfer in the mould are the more relevant functions of these materials. Values of physical properties like viscosity and surface tension at melting range temperatures are required, as much as the thermal behaviour under process conditions. The heat extraction from the liquid steel has an important effect in the final quality of products. Mould fluxes are constituted by different oxides, and may form glasses and crystal phases during cooling. The solidification rate and the chemical composition determine the proportion, type and crystalline morphology, which are responsible of the thermal transfer processes. In this paper, viscosity values are reported in the melting range temperatures calculated by means of the Riboud model and compared with fluidity results obtained by inclined plane technique. Also the linear expansion of the mould fluxes at high temperatures was determined by dilatometry. The crystallization in two different fluxes were determined by DTA tests and correlated with the basicity index. Crystal phases were evaluated by scanning electronic microscopy on quenched samples at 1300 °C. This information is relevant to increase the knowledge on peritectic steel grades casting process in order to improve its quality.
The knowledge of the physical and chemical properties as well as the behaviour of the mould fluxes during melting are important in order to improve continuous casting operations. Lubrication and control of heat transfer in the mould are the more relevant functions of these materials. Values of physical properties like viscosity and surface tension at melting range temperatures are required, as much as the thermal behaviour under process conditions. The heat extraction from the liquid steel has an important effect in the final quality of products. Mould fluxes are constituted by different oxides, and may form glasses and crystal phases during cooling. The solidification rate and the chemical composition determine the proportion, type and crystalline morphology, which are responsible of the thermal transfer processes. In this paper, viscosity values are reported in the melting range temperatures calculated by means of the Riboud model and compared with fluidity results obtained by inclined plane technique. Also the linear expansion of the mould fluxes at high temperatures was determined by dilatometry. The crystallization in two different fluxes were determined by DTA tests and correlated with the basicity index. Crystal phases were evaluated by scanning electronic microscopy on quenched samples at 1300 °C. This information is relevant to increase the knowledge on peritectic steel grades casting process in order to improve its quality.
Keywords
Mould fluxes, Heat transfer, peritectic steels.
Mould fluxes, Heat transfer, peritectic steels.
How to refer
Brandaleze, Elena;
Castellá, Lucas;
Benavidez, Edgardo.
BEHAVIOR OF CONTINUOUS CASTING FLUXES DURING HEATING AND COOLING
,
p. 351-359.
In: 35º Seminário de Fusão, Refino e Solidificação dos Metais e 5º Seminário de Fundição,
Salvador,
2004.
ISSN: 2594-5300
, DOI 10.5151/2594-5300-0035
