FIELD: machine building.
SUBSTANCE: invention relates to mandrel, used in piercing mill, piercing and rolling workpiece. Piercing mandrel consists of housing and coating based on iron and iron oxide sprayed on housing surface, wherein sprayed coating contains the following, wt%: C 0.015-0.6, Si 0.05-0.5, Mn 0.1-1.0, Cu 0-0.3, iron, iron oxide and impurities - the rest, wherein iron oxide content in coating ranges from 55-80 vol%.
EFFECT: higher efficiency of hollow tubular billets production by obtaining mandrels with high-quality coating.
6 cl, 2 tbl, 3 dwg, 1 ex
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