FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy. To increase the strength of the sheet steel and reduce its specific weight, an annealing of the sheet steel is carried out comprising the first step, consisting in the complete oxidation of the sheet steel surface and thereby creating a completely oxidized surface layer, the second step, consisting in the selective oxidation of other, in addition to iron, elements of steel in the area that continues under said fully oxidized layer, thus creating a selectively oxidized inner layer and the third step, consisting in the complete reduction of said fully oxidized surface layer.
EFFECT: increased strength and reduced specific weight of sheet steel.
15 cl, 2 tbl
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