B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
B22D 11/11 (2006.01) B22D 11/10 (2006.01) C21C 7/06 (2006.01)
Patent
CA 2370437
According to this treatment, calcium is added to ultra low molten steel or low carbon which is aluminum killed (or in the course of being killed) in order to form non-metallic deoxidation inclusions that have a melting point which is below the casting temperature; the molten metal is maintained in the chain of treatment ranging from the ladle refining installation to the copper mold with a low minimum low magnesium content of approximately 2ppm. The inventive method increases the scope of fusibility of the inclusionary population of steels, thereby improving the castability of high aluminum-killed ultra low carbon grades without the need for argon bubbling.
Selon ce traitement, dans lequel, à un bain d'acier ultra bas ou bas carbone calmé à l'A1 (ou en cours de calmage) on ajoute du calcium afin de former des inclusions non métalliques de désoxydation ayant un point de fusion inférieur à la température de coulée, on maintient le bain métallique à une teneur minimale basse en magnésium, voisine de 2 ppm, dans la chaîne de traitement qui va de l'installation d'affinage en poche à la lingotière de coulée. La mise en oeuvre de l'invention procure un élargissement du domaine de fusibilité de la population inclusionnaire des aciers et améliore ainsi la coulabilité des nuances ultra bas carbone fortement calmées à l'Aluminium sans nécessiter de bullage argon.
Bertrand Florence
Lehmann Jean
Sosin Laurent
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Usinor
LandOfFree
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