Fluorine-free mould slags for slab casting: utilisation of the hot thermocouple technique to build TTT diagrams



Título del documento: Fluorine-free mould slags for slab casting: utilisation of the hot thermocouple technique to build TTT diagrams
Revue: Tecnologia em metalurgia, materiais e mineracao
Base de datos: PERIÓDICA
Número de sistema: 000344742
ISSN: 2176-1515
Autores:

1
1
2
Instituciones: 1Universidade Federal do Rio Grande do Sul, Escola de Engenharia, Porto Alegre, Rio Grande do Sul. Brasil
2Freiburg University of Mining and Technology, Institute or Iron and Steel Technology, Freiburg. Alemania
Año:
Periodo: Ene-Mar
Volumen: 9
Número: 1
Paginación: 30-36
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Aplicado, descriptivo
Resumen en inglés The elimination of fluorine from slags is necessary because F-bearing materials pollute the environment and cause machinery corrosion at steelworks. Regarding the development of F-free mould slags for slab casting, the main problem is how to control the heat transfer between steel shell and mould. In commercial products the heat transfer control is obtained through the crystallisation of cuspidine (3CaO.2SiO2.CaF2) from mould slag. Thus, the fluorine-free slag which would be used as the substitute must show similar crystallisation behaviour. This paper shows results of a cooperation work between Technische Universität Bergakademie Freiberg and Universidade Federal do Rio Grande do Sul. Ti-bearing slags were studied through the Single Hot Thermocouple Technique, building time-temperature-transformation (TTT) diagrams. The results indicate that the system CaO-SiO2-TiO2-Na2O can be used as substitute for F-bearing slags, regarding crystallisation behaviour, since the incubation times at TTT diagram can be similar to commercial products. This is possible because addition of Na2O shorten intensely the incubation times from the CaO-SiO2-TiO2 slag system
Disciplinas: Ingeniería
Palabras clave: Ingeniería metalúrgica,
Moldeado,
Lingotes,
Acero,
Escoria,
Técnica de termopares calientes
Keyword: Engineering,
Metallurgical engineering,
Casting,
Slabs,
Steel,
Slag,
Hot thermocouple technique
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