Title

The "ALT" Process (ARBED Ladle Treatment)

The "ALT" Process (ARBED Ladle Treatment)

Authorship

GOEDERT, J.; MOUSEL, R.

GOEDERT, J.

I am this author

MOUSEL, R.

I am this author

DOI

10.5151/2594-5300-13Aciaria-407-414

Downloads

Abstract

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.

Keywords

In-ladle desulphurization, ALT process, Calcium injection, Inclusion modification, Mechanical properties

In-ladle desulphurization, ALT process, Calcium injection, Inclusion modification, Mechanical properties