INOCULATION ALLOY AGAINST MICRO-SHRINKAGE CRACKING FOR TREATING CAST IRON CASTINGS

The invention concerns inoculation alloys for treating cast iron castings containing (by wt. %%) 0.005 %% to 3 %% of an element of the group consisting of bismuth, lead and antimony, 0.3 to 10 %% of metals of rare- earth group and optionally aluminium up to 5 %% and calcium up to 1.5 %%, the rest being ferro-silicon, lanthanum constituting more than 90 %% of the rare-earth metals contained in the composition. The inventive alloys enable efficient inoculation of cast iron and avoid occurrence of micro- shrinkage cracking in the cast parts. The alloys are conditioned in the form of slugs or powder. © KIPO & WIPO 2007