FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, namely, to a ferrosilicon-based modifier for producing cast iron with spherical graphite. Modifier contains a ferrosilicon alloy in the form of particles, consisting of, wt.%: 40 to 80 Si; 0.02 to 8 Ca; 0 to 5 Sr; 0 to 12 Ba; 0 to 15 rare earth metal; 0 to 5 Mg; 0.05 to 5 Al; 0 to 10 Mn; 0 to 10 Ti; 0 to 10 Zr; the rest being Fe and random impurities, wherein the alloy additionally contains, as calculated for the total mass of the modifier, wt.%: 0.1 to 15 Bi2O3 in the form of particles and optionally 0.1 to 15 Bi2S3 in the form of particles, and/or 0.1 to 15 Sb2O3 in the form of particles, and/or 0.1 to 15 Sb2S3 in the form of particles, and/or 0.1 to 5 of Fe3O4, Fe2O3, FeO in the form of particles or a mixture thereof, and/or 0.1 to 5 of one or more from FeS, FeS2, Fe2S2 in the form of particles or a mixture thereof.
EFFECT: invention ensures production of a highly efficient modifier forming a large amount of crystallisation nuclei, leading to an increase in the numerical density of spherical graphite inclusions and contributes to an increase in the efficiency of modification due to the resistance to the reduction in the modifying effect for a long settling time of the cast iron melt.
21 cl, 5 tbl, 8 dwg, 5 ex
