METHOD FOR MANUFACTURING A STEEL STRIP WITH IMPROVED CONNECTION OF HOT METAL COATINGS Russian patent published in 2023 - IPC C21D1/68 C21D6/00 C23C2/02 C23C2/04 C23C28/00 C25D3/20 C25D3/22 C25D5/10 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, namely, to a method for manufacturing cold-rolled or hot-rolled steel strip with a metal coating. Method for creating a metal coating on a cold-rolled or hot-rolled steel strip includes the stages of providing a cold-rolled or hot-rolled steel strip containing iron as the main component and, in addition to carbon, Mn 8.1 to 25.0 wt.%, unavoidable impurities, as well as at least one alloying element, if necessary: Al, Si, Cr, B, Ti, V, Nb, Mo, P, and S; cleaning the strip surface; applying a layer of pure iron with an average iron content above 96 wt.% onto the cleaned surface; applying an oxygen-containing iron-based layer containing oxygen more than 5 to 40 wt.% onto the pure iron layer. The cold-rolled or hot-rolled steel strip with the oxygen-containing iron-based layer is then subjected to annealing treatment and reduction treatment in the course of the annealing treatment in the reducing atmosphere of a furnace. Finally, a metal coating is applied by hot dipping onto the treated annealed steel strip.

EFFECT: high adhesion of the metal coating to a steel substrate and higher capacity for galvanising steels with a high content of manganese.

19 cl, 3 tbl