METHOD FOR PRODUCTION OF BAND-SHAPED ELECTRICAL STEEL WITH ORIENTED STRUCTURE AND STRIP ELECTRICAL STEEL WITH ORIENTED STRUCTURE Russian patent published in 2020 - IPC C21D8/12 C22C38/00 C23C22/00 G01N21/84 

FIELD: metallurgy.

SUBSTANCE: invention relates to production of high-magnetic strip electric steel with oriented structure. Steel contains, wt. %: 2.0–4.0 Si, 0.010–0.100 C, ≤ 0.065 Al, ≤ 0.02 N, optionally additional elements, Fe and unavoidable impurities is the balance, is treated by a standard method for producing a cold-rolled strip which is subjected to oxidative/primary recrystallization annealing to form an oxide layer, then, using Fourier transformation infrared spectroscopy, the spectrum of the obtained oxide layer is picked up and the area (Fe₂SiO₄) for the peak, which is Fe₂SiO₄ molecules in the oxide layer and is found at 980 cm^-1, is determined on it, as well as area (α-SiO₂) for peak, which is present in oxide layer of α-SiO₂ molecule αand is at 1250 cm^-1. Composition of steel, modes of cold rolling, oxidizing/primary recrystallization annealing, and optional annealing of hot-rolled strip is controlled when the following condition is met: 0.5 x area (Fe₂SiO₄) ≤ area (α-SiO₂) ≤ 2 x area (Fe₂SiO₄). Annealing separator layer is applied on the strip with an oxide layer and high-temperature annealing is performed to form a layer of forsterite, on which an insulating layer is applied and final annealing is performed.

EFFECT: invention discloses a method of producing strip-oriented electrical steel with an oriented structure and strip electrotechnical steel with an oriented structure.

10 cl, 3 tbl, 2 dwg