STEEL PLATE WITH ELECTROPLATED COATING AND METHOD OF ITS MANUFACTURING Russian patent published in 2016 - IPC C21D9/48 C22C38/02 C23C2/06 C21D8/04 

FIELD: metallurgy.

SUBSTANCE: steel plate on its surface has layer of electroplated coating, and it is made out of steel containing in wt %: C 0.05-0.40, Si 0.5-3.0 and Mn 1.5-3.0, P within 0.04 or below, S within 0.01 or below, N within 0.01 or below, Al within 2.0 or below, O within 0.01 or below, Fe and inevitable admixtures, microstructure of the steel plate contains ferrite, beinite, tempered martensite 30 vol % or over, and austenite 8 vol % or over, at that tensile strength of the steel plate is 980MPa or over, at that layer of the electroplated coating has oxide containing at least one chemical element selected from Si, Mn and Al, and in cross-section through plate thickness, including steel plate and layer of electroplated coating the area of oxide projection is 10% or over.

EFFECT: assurance of plate resistance against delayed fracture, increased tensile strength, electroplated coating adhesion, elongation and expansion of holes.

11 cl, 13 tbl, 5 dwg