FIELD: process engineering.
SUBSTANCE: invention relates to metallurgy. Sand blend contains filler and organic acid salt. The latter is selected from the group consisting of citrates, acetates, tartrates and mixes there of in compound of 0.25-5.0 wt % of filler bulk in sand blend.
EFFECT: decreased formation of punching.
18 cl, 1 tbl, 2 ex
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