ISSN 2594-5300
13º Seminário de Aciaria — Vol. 01 , num. 13 (1981)
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Crowing quality demands prompted ARBED to develop and implement a process for in-ladle desulphurizing of steel that would easily fit into its existing ladle treatment equipment. The ALT process uses a special cellular feed device for adding powdery materials to a gas stream. The technique thus developed permits reliable desulphurization rates of 90% with final sulphur contents below 0.003%. The effects of in-ladle desulphurization on the inclusion property and the mechanical characteristics have been studied: considerable decrease of the quantity of sulphurous inclusions and globularisation of the remaining inclusions; vanishing of silicates and replacing of alumina trails by complex Ca-based globular inclusions; distinct improvement of cross ductility (elongation and flexibility); improvement of longitudinal and especially transverse resilience; considerable improvement of constriction.
Crowing quality demands prompted ARBED to develop and implement a process for in-ladle desulphurizing of steel that would easily fit into its existing ladle treatment equipment. The ALT process uses a special cellular feed device for adding powdery materials to a gas stream. The technique thus developed permits reliable desulphurization rates of 90% with final sulphur contents below 0.003%. The effects of in-ladle desulphurization on the inclusion property and the mechanical characteristics have been studied: considerable decrease of the quantity of sulphurous inclusions and globularisation of the remaining inclusions; vanishing of silicates and replacing of alumina trails by complex Ca-based globular inclusions; distinct improvement of cross ductility (elongation and flexibility); improvement of longitudinal and especially transverse resilience; considerable improvement of constriction.
Palavras-chave
In-ladle desulphurization, ALT process, Calcium injection, Inclusion modification, Mechanical properties
In-ladle desulphurization, ALT process, Calcium injection, Inclusion modification, Mechanical properties
Como citar
Goedert, J.; Mousel, R..
The "ALT" Process (ARBED Ladle Treatment),
p. 407-414.
In: 13º Seminário de Aciaria,
None,
1981.
ISSN: 2594-5300, DOI 10.5151/2594-5300-13Aciaria-407-414
