FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Proposed composition contains that following substances, in wt %: fine-fraction expanded-clay - 49-55, carbon-containing substance - 39-49, carbonate of alkaline metal - 0.2-0.8, sodium chloride - 1.4-4.0, and cryolite - 0.4-1.2.
EFFECT: higher surface quality, better macro- and microstructures, reduced amount of rejections.
1 cl, 3 tbl
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