Defines the grades of grain-oriented electrical steel sheet in nominal thicknesses of 0,23 mm, 0.27 mm, 0.30 mm and 0.35 mm. Gives general requirements, magnetic properties, geometric characteristics and tolerances, and technological characteristics, as well as inspection procedures. Applies to Goss textured grain-oriented electrical steel sheet supplied in the final annealed condition in sheets or coils, and intended for the construction of magnetic circuits.