Cast iron inoculum and method of making cast iron inoculum

摘要

An inoculant for manufacturing cast iron with lamellar, compacted or spheroidal graphite is disclosed. The inoculant has a particulate ferrosilicon alloy 40 and 80% by weight of silicon, 0.5 and 5% by weight of calcium and/or strontium and/or barium, 0 and 10% by weight of rare earths, 0 and 5% by weight of magnesium, less than 5% by weight of aluminium, 0 and 10% by weight of manganese and/or zirconium, and the balance being iron, wherein the inoculant additionally contains 0.1 to 10% by weight of particulate bismuth oxide particles and optionally 0.1 and 10% by weight of one or more particulate metal sulphides and/or one or more particulate iron oxides, where the particulate bismuth oxide is mixed or blended with the ferrosilicon particles, or is simultaneously added to cast iron together with the particulate ferrosilicon particles.