ISSN 2594-5300
52º Seminário de Aciaria, Fundição e Metalurgia de Não-Ferrosos — vol. 52, num.52 (2023)
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Resumo
The ever-increasing demand for steel grades with improved quality requirements has brought to light the importance of the quality of ferroalloys and their influence on the quality of the steel products. These technological challenges are also concerning the cored wire process, particularly the calcium treatment, for improved castability and inclusion shape control. Besides the traditional CaSi and CaFe wires, new types of wires, Ca HDx™ and HDx™ hybrid, have been designed at Affival for becoming the new references in calcium treatment. The main features of these wires are to be intrinsically composed of extruded calcium and a thermal insulation layer. In particular, the filler of the HDx™ hybrid wire is constituted by a solid extruded calcium core, surrounded by a powder with the double purpose of providing insulation as well as a metallurgical effect to decrease the reactivity associated with pure calcium. There exist numerous references discussing the impact of calcium treatment on the steel cleanliness. However, the issue of the inherent cleanliness of the Ca-bearing additions performed in the bath and their potential impact on steel quality is commonly overlooked. This work intends to be a first contribution for filling in this gap.
The ever-increasing demand for steel grades with improved quality requirements has brought to light the importance of the quality of ferroalloys and their influence on the quality of the steel products. These technological challenges are also concerning the cored wire process, particularly the calcium treatment, for improved castability and inclusion shape control. Besides the traditional CaSi and CaFe wires, new types of wires, Ca HDx™ and HDx™ hybrid, have been designed at Affival for becoming the new references in calcium treatment. The main features of these wires are to be intrinsically composed of extruded calcium and a thermal insulation layer. In particular, the filler of the HDx™ hybrid wire is constituted by a solid extruded calcium core, surrounded by a powder with the double purpose of providing insulation as well as a metallurgical effect to decrease the reactivity associated with pure calcium. There exist numerous references discussing the impact of calcium treatment on the steel cleanliness. However, the issue of the inherent cleanliness of the Ca-bearing additions performed in the bath and their potential impact on steel quality is commonly overlooked. This work intends to be a first contribution for filling in this gap.
Palavras-chave
Calcium treatment; Cored wire; Inclusion; Steel cleanliness
Calcium treatment; Cored wire; Inclusion; Steel cleanliness
Como citar
Cedeno, Edgar Ivan Castro;
Carre, Alexandre;
Cainarca, Alvaro Andres Bustos.
CALCIUM ADDITION CLEANLINESS AND ITS POTENTIAL EFFECTS ON STEEL QUALITY
,
p. 587-600.
In: 52º Seminário de Aciaria, Fundição e Metalurgia de Não-Ferrosos,
São Paulo,
2023.
ISSN: 2594-5300
, DOI 10.5151/2594-5300-39418
