cold rolled and annealed ferrous alloy sheet or strip, method of manufacturing a ferrous alloy strip or sheet, transformer magnetic core and transformer

摘要

It is a cold rolled and annealed ferrous alloy sheet or strip (1), characterized by the fact that its composition is, in percentages by weight: traces = co = 40%; if co = 35%, dashes = si = 1.0%; if dashes = co 35%, dashes = si = 3.5%; if traces = co 35%, si + 0.6% of al = 4.5 - 0.1% of co; dashes = cr = 10%; dashes = v + w + mo + ni = 4%; dashes = mn = 4%; dashes = 1 = 3%; dashes = s = 0.005%; dashes = p = 0.007%; dashes = ni = 3%; dashes = cu = 0.5%; dashes = nb = 0.1%; dashes = zr = 0.1%; dashes = ti = 0.2%; dashes = n = 0.01%; dashes = ca = 0.01%; dashes = mg = 0.01%; dashes = ta = 0.01%; dashes = b = 0.005%; dashes = o = 0.01%; the remainder being iron and impurities resulting from the preparation, where, for an induction of 1.8 t, the maximum difference (max ¿¿) between the deformation amplitudes by magnetostriction ¿, measured parallel to the magnetic field (ha ) applied (¿// h) and perpendicular to the magnetic field (ha) applied (¿-h) to three rectangular samples (2, 3, 4) of said sheet or strip whose long sides are respectively parallel to the direction of lamination ( dl) of said sheet or strip, parallel to the transverse direction (dt) of said sheet or strip, and parallel to the direction that forms an angle of 45 ° with said rolling direction (dl) and said transverse direction (dt) ), which is a maximum of 25 ppm, and its recrystallization rate is 80 to 100%. It is also a method of manufacturing such a sheet or strip, a transformer magnetic core made therefrom and a transformer comprising the same.