FIELD: metallurgy.
SUBSTANCE: invention relates to galvanized steel sheet for hot pressing used in automotive industry. Zinc-plated steel sheet contains a zinc-plated layer and the main steel sheet. In the region from the boundary between the galvanized layer and the main steel sheet on the side of the main steel sheet at the boundaries and inside the crystalline grains there is an internal oxide containing at least such oxidising elements as Si, Mn and Cr. Main steel sheet has the composition containing the following, wt. %: C: from 0.10 to 0.5, Si: from 0.50 to 2.5, Mn: from 1.0 to 3, Cr: from 0 to 1.0, iron and unavoidable impurities - the rest. Composition of the main steel sheet satisfies the following expression: (2×[Si]/28.1 + [Mn]/54.9 + 1.5×[Cr]/52.0)≥0.05, where [Si], [Mn] and [Cr] are content of Si, Mn and Cr, wt. %, in the main steel sheet, respectively.
EFFECT: provides for suppression of cracks formation during pressing due to liquid metal embrittlement.
8 cl, 3 dwg, 4 tbl, 3 ex
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