COLD-ROLLED STEEL STRIP HAVING A SILICON CONTENT OF AT LEAST 3.2 WT. AND USED FOR ELECTROMAGNETIC PURPOSES

摘要

The present invention relates to a cold-rolled steel strip or - metal sheet in thicknesses of 0,70 mm for electromagnetic applications, consisting of a steel, of the (in w -%) c: & 0,01%, si: 3,2 - 7%, al: & 2%, mn: 1%, remainder iron and usual impurities and after the melting to a starting material, such as a slab, a thin slab or a thin strip, has been cast, which then to a temperature t φ r φ & 1000 deg c and soaked in the case of a hot rolling final temperature t φ f φ of 800 deg c to form a hot strip has been finished hot-rolled, which is then, starting from an at least 750 deg c, but less than 850 deg c, temperature t, φ c φ of the hot strip, with an at least 400 deg c / min deltat / deltat cooling rate, amounting to a less than 300 deg c. temperature of cooled, after cooling, a surface treatment, such as mechanical descaling and / or pickling, according to the surface treatment in the case of an at most 500 deg c, temperature t, φ cr φ cold-rolled and, finally, the end has been annealed for.