Procedimiento para la fabricación de una banda de acero eléctrico de grano orientado y banda de acero eléctrico de grano orientado

• Main Authors: HECHT, Christian, SCHEPERS, Carsten, LAHN, Ludger
• Format: Patent
• Language: Spanish
• Published: 01.09.2020
• Subjects: CHEMISTRY; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS

A method is used to produce a grain-oriented electrical steel strip having optimized magnetic properties. The method may utilize a steel comprising in percent by weight 2.0-4.0% Si, 0.010-0.100% C, at most 0.065% Al, at most 0.02% N, and optionally further constituents, the balance being iron and unavoidable impurities. The steel may be processed to give a cold strip, which may then be subjected to oxidation/primary recrystallization annealing. The resultant cold strip may have an oxide layer to which an annealing separator layer is applied. In a subsequent high-temperature anneal, a forsterite layer forms therefrom, and an insulation layer may be applied thereto prior to a final anneal. After the oxidation/primary recrystallization anneal, a spectrum of the oxide layer obtained is determined by way of FTIR, and an area (Fe2SiO4) is determined for a peak representing Fe2SiO4 molecules present in the oxide layer and is at 980 cm−1, and an area (αSiO2) for a peak representing αSiO2 molecules present in the oxide layer and is at 1250 cm−1. Then the composition of the steel, parameters for the cold rolling, parameters for the oxidation/primary recrystallization anneal, or parameters for a hot strip anneal are adjusted such that 0.5×area (Fe2SiO4)≤area (αSiO2)≤2×area (Fe2SiO4).