CAST IRON INOCULANT AND METHOD FOR PRODUCTION OF CAST IRON INOCULANT

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The present invention relates to an inoculant for the manufacture of cast iron with lamellar, compacted or spheroidal graphite. The inoculant comprises a particulate ferrosilicon alloy between 40 and 80 % by weight of silicon, between 0.5 and 5% by weight of calcium and/or strontium and/or barium, between 0 and 10 % by weight of rare earths, for example cerium and/or lanthanum, between 0 and 5 % by weight of magnesium, less than 5% by weight of aluminium, between 0 and 10 % by weight of manganese and/or zirconium, and the balance being iron, wherein said inoculant additionally contains 0.1to 10 % by weight of particulate bismuth oxide particles and optionally between 0.1 and 10 % by weight of one or more particulate metal sulphides and/or one or more particulate iron oxides, where said particulate bismuth oxide is mixed or blended with the ferrosilicon particles, or is simultaneously added to cast iron together with the particulate ferrosilicon particles. The invention further relates to a method for the production of the inoculant.