FECO- OR FESI- OR FE-ALLOY SHEET OR STRIP AND ITS MANUFACTURING PROCESS, TRANSFORMER MAGNETIC CORE MADE FROM IT AND TRANSFORMER CONTAINING IT

• Main Authors: HELBERT, Anne-Laure, BATONNET, Rémy, WAECKERLE, Thierry, HUBERT, olivier, BAUDIN, Thierry
• Format: Patent
• Language: English; French; German
• Published: 11.08.2021
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INDUCTANCES; MAGNETS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

Sheet or strip of cold-rolled and annealed ferrous alloy (1), characterized in that its composition is, in weight percentages: traces≤Co≤40%; if Co≥35%, traces≤Si≤1.0%; if traces≤Co<35%, traces≤Si≤3.5%; if traces≤Co<35%, Si+0.6% Al≤4.5−0.1% Co; traces≤Cr<10%; traces≤V+W+Mo+Ni≤4%; traces≤Mn≤4%; traces Al≤3%; traces≤S≤0.005%; traces≤P≤0.007%; traces≤Ni≤3%; traces≤Cu≤0.5%; traces≤Nb≤0.1%; traces≤Zr≤0.1%; traces≤Ti≤0.2%; traces≤N≤0.01%; traces≤Ca≤0.01%; traces≤Mg≤0.01%; traces≤Ta≤0.01%; traces≤B≤0.005%; traces≤O≤0.01%; the remainder being iron and impurities resulting from the preparation, in that, for an induction of 1.8 T, the maximum difference (Max Δλ) between the magnetostriction deformation amplitudes λ, measured parallel to the magnetic field (Ha) applied (λ/H) and perpendicular to the magnetic field (Ha) applied (λ⊥H) on three rectangular samples (2, 3, 4) of the said sheet or strip whose long sides are respectively parallel to the direction of rolling (DL) of the said sheet or strip, parallel to the transverse direction (DT) of the said sheet or strip, and parallel to the direction forming an angle of 45° with the said rolling direction (DL) and the said transverse direction (DT), being at most 25 ppm, and in that its recrystallization rate is 80 to 100%.Method of manufacturing such a sheet or strip, transformer magnetic core made from it and a transformer comprising it.