FIELD: metallurgy.
SUBSTANCE: proposed mandrel comprises shank and working section with cross-section decreasing from the shank. Mandrel is increased owing to its production from steel of grades that features higher hardenability compared with that of steels "ШХ15" and "50ХФА". Note here that hardened ply on mandrel surface features depth making at least one third of its cross-section.
EFFECT: decreased losses at transfer caused by replacements.
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