HOT-MOLDED ARTICLE Russian patent published in 2020 - IPC C22C38/60 C22C38/06 B21D22/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely to a hot-stamped article used for structural parts or reinforcing elements of vehicles or for structures requiring strength. Product comprises middle part of sheet thickness, intermediate layer and surface layer, wherein intermediate layer adjoins said middle part over sheet thickness and said surface layer. Middle part of the leaf thickness contains the following, wt%: C: 0.20 or more and less than 0.70, Si: less than 3.00, Mn: 0.20 or more and less than 3.00, P: 0.10 or less, S: 0.10 or less, sol. Al: from 0.0002 or more to 3.0000 or less, N: 0.01 or less, Fe and unavoidable impurities – the rest, at that it has hardness from 500HV or more to 800HV or less. Surface layer has change of hardness ΔH₁ in direction of sheet thickness of 100HV or more and less than 200HV, and intermediate layer has change of hardness ΔH₂ in direction of sheet thickness of 10HV or more and less than 50HV.

EFFECT: article has high impact resistance and resistance to hydrogen embrittlement.

11 cl, 2 dwg, 16 tbl, 4 ex