METHOD OF PRODUCING STEEL PARTS WITH HIGH-PRODUCTIVITY COATING HARDENED IN PRESS Russian patent published in 2018 - IPC C09D5/32 C09D5/00 C09D133/02 C09D163/00 B32B15/08 C23C2/12 C23C2/26 C23C2/28 

FIELD: metallurgy.

SUBSTANCE: invention relates to a pre-coated sheet or a workpiece comprising a steel substrate for heat treatment, which is overlapped by a preliminary coating over at least one section of at least one of its main surfaces. The pre-coating comprises at least one layer of aluminium or an aluminium alloy, covered over at least one section of above-mentioned pre-coating by a polymerized layer having thickness of 2-30 mcm. The polymerized layer consists of a polymer which contains no silicon and which nitrogen content does not exceed 1 wt % in terms of the weight of the above-mentioned layer. The above-mentioned polymerized layer contains carbon-containing pigments in an amount of 3-30 wt % in terms of weight of the said layer.

EFFECT: enhancement of coating reliability.

22 cl, 9 dwg, 9 tbl, 4 ex