FIELD: metallurgy.
SUBSTANCE: cast iron melt is processed in the mould by feeding modifying mix. The latter contains a spheroidising additive composed of ferromagnesium silicon and graphitising additive composed of boric acid. Said additives are added in amounts that allows obtaining 0.03-0.06% of residual magnesium and 0.005-0.007% of boron in finished casting. Then, spontaneous annealing of casting is performed in the mould for 60 minutes.
EFFECT: higher toughness at negative temperatures and process efficiency.
2 tbl
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