METHOD OF MAKING COLD-ROLLED WELDED STEEL SHEETS AND SHEETS PRODUCED IN SUCH A WAY Russian patent published in 2019 - IPC C21D8/02 B21B1/28 C22C38/58 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of metallurgy. To achieve technical result, method of making cold-rolled steel sheet with thickness e_f in range from 0.5 mm to 3 mm includes supply of at least two hot-rolled sheets with thickness of e_i, then said at least two hot-rolled sheets are butt welded to create weld (S1) with direction perpendicular to hot rolling direction, thereafter, said at least two hot-rolled sheets are etched as a result of continuously flowing through the bath, then at stage (L1), the prefabricated structure of at least two hot-rolled and welded sheets is subjected to cold rolling to intermediate thickness e_int, wherein cold rolling direction (DL₁) coincides with said hot rolling direction, wherein cold rolling is carried out at reduction ratio ε₁=Ln(e_i/e_int) and meeting the condition: 0.35≤(Ln(ei/eint))/Ln(ei/ef)≤0.65, after that, said weld (S1) is removed to obtain at least two intermediate cold-rolled sheets, after which two intermediate cold-rolled sheets are butt welded so as to form a weld (S2), the direction of which is perpendicular to the hot rolling direction, and then at stage (L2), assembly structure of at least two intermediate cold-rolled and welded sheets is subjected to cold rolling to final thickness e_f, wherein direction (DL₂) stage of cold rolling (L2) coincides with rolling direction (DL₁).

EFFECT: high degree of homogeneity of mechanical properties of the base sheet and the weld seam.

25 cl, 6 tbl