PRODUCTION METHOD OF HIGH-STRENGTH CAST-IRONS WITH BALL-SHAPED OR COMPACTED GRAPHITE BASED ON NANOSTRUCTURED RECARBURISING AGENT Russian patent published in 2013 - IPC C21C1/10 

FIELD: metallurgy.

SUBSTANCE: proposed method involves melting of a charge in a melting unit, heat treatment of the melt at 1300…1650°C; at that, when obtaining cast-iron with ball-shaped graphite, primary modification is performed with nanostructured recarburising agent in the quantity of 0.10…0.25% of the melt weight, and secondary spheroidising modification is performed by means of a modifying agent containing 5…7% of magnesium, in the quantity of 1.2…2.0% of the melt weight, and when obtaining cast-iron with compacted graphite, primary modification is performed with nanostructured recarburising agent in the quantity of 0.10…0.25% of the melt weight, and secondary compacting modification is performed with a modifying agent containing 3…5% of magnesium and 3…6% of rare-earth elements in the quantity of 0.3…0.8% of the melt weight.

EFFECT: invention allows obtaining high-strength cast-iron for mass casting of items with increased physic and mechanical properties.

4 cl, 1 tbl