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Specifies the steel grades of grain-oriented electrical sheet and strip in nominal thicknesses of 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm; in particular, general requirements, magnetic properties, geometric characteristics and tolerances and technological characteristics, as well as inspection procedures. This European Standard applies to Goss extured grain-oriented magnetic sheet steel supplied in the final annealed condition in sheets or coils, ad intended for the construction of magnetic circuits. The materials are grouped into two classes: - conventional grain oriented material; - high permeability grain oriented material.