MODIFIER Russian patent published in 2009 - IPC C22C35/00 C21C1/08 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy, to foundry engineering and to machine building and can be implemented at production of casts out of grey cast hypoeutectic iron operating under conditions of excess wear, for example railroad car brake blocks, big tooth gears, parts of windlass and cylinder cartridge. As a zirconium containing additive the modifier contains zirconium dioxide (ZrO₂), as silicon containing additive it contains silicon dioxide (SiO₂), as a bubbling additive - foam plastic crumb and as a reducer - aluminium at following ratio of components, wt %: SiO₂ 35.0-45.0; ZrO₂ 35.0-45.0; Al 10.0-19.0; foam plastic crumb up to 1.0.

EFFECT: upgraded operational properties of iron casts: wear resistance is increased at 8-10%, and leak tightness - 1,5-2 times.

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