Inoculant products comprising bismuth and rare earths

Details Inoculant products comprising bismuth and rare earths Inoculant products comprising bismuth and rare earths

C - Chemistry, Metallurgy

22

C

C22C 33/08 (2006.01) B22D 27/20 (2006.01) C21C 1/10 (2006.01)

Patent

CA 2526268

The invention relates to an inoculant mixture for the treatment of molten cast iron, comprising 5 to 75 % by weight of a ferro-silicon alloy of type A where Si/Fe > 2, containing 0.005 to 3 % by weight of rare earths, 0.005 to 3 % bismuth, lead and/or antimony and less than 3 % calcium, with a ratio (Bi+Pb+Sb)/TR of between 0.9 and 2.2 and 25 to 95 % of at least one alloy of type B, based on silicon or ferro-silicon such that Si/Fe > 2, containing calcium to a level such that the total amount of calcium in the mixture is from 0.3 to 3 %. The above mixtures have a good granulometric stability over time and provide an efficient inoculation of cast pieces, in particular of thin pieces.

L'invention a pour objet un mélange inoculant pour le traitement de la fonte liquide constitué pour 5 à 75% en poids d'au moins un alliage de type A à base de ferro-silicium tel que Si/Fe > 2, contenant de 0,005 à 3% en poids de terres rares, de 0,005 à 3% de bismuth, plomb et/ou antimoine, et moins de 3% de calcium, avec un rapport (Bi+Pb+Sb)/TR compris entre 0,9 et 2,2, et pour 25 à 95% d'au moins un alliage de type B à base de silicium, ou de ferro-silicium tel que Si/Fe > 2, contenant du calcium à une teneur telle que la teneur totale en calcium du mélange soit comprise entre 0,3 à 3%. Les mélanges selon l'invention présentent une bonne stabilité granulométrique dans le temps et assurent une inoculation efficace des pièces en fonte, notamment des pièces de faible épaisseur.

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