FIELD: foundry and metallurgy, more particularly treatment of modifiers for cast iron. SUBSTANCE: prior to cladding ultradispersive modifier is treated with 10- 20 % glycerol-containing nitric acid solution. Nitric acid solution to glycerol ratio is 1:(3-5). Ultradispersive modifier is plasmochemical synthesis modifier with particle size of 0.01-0.10 mcm. EFFECT: more efficient treatment method. 3 cl, 1 tbl
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