PROCEDE POUR LE POST-TRAITEMENT D'UN BAIN DE FONTE

• Main Author: KARL GUT ET IVO HENYCH
• Format: Patent
• Language: French
• Published: 26.06.1987
• Edition: 4
• Subjects: ALLOYS; CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; METALLURGY OF IRON; PERFORMING OPERATIONS; POWDER METALLURGY; PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL; TRANSPORTING; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Dans ce procédé pour le post-traitement d'un bain de fonte, désulfurée et alliée au Mg, destinée à la production de fonte à graphite sphéroïdal, le bain subit un post-traitement par des gaz ou des mélanges gazeux, qui sont introduits dans le bain à l'aide de lances d'insufflation ou de tampons poreux. L'invention trouve son application principale dans l'amélioration de la qualité des articles en fonte. A process for the production of nodular cast iron is disclosed. The process comprises adding magnesium to molten iron and then desulphurizing the melt. Next, the melt is after-treated with a neutral gas. The neutral gas which is introduced into the melt may be Ar, N2, CO2, or any combination thereof. The after-treatment with the neutral gas scavenges the melt for nonmetallic inclusions. The after-treatment may be performed by blowing the gas into the melt in a known manner using blowing lances or through a porous plug. In a preferred embodiment, the melt is also carburized by treatment with a gaseous hydrocarbon.