Nippon Steel Corporation

Kazuo Nakamura

Yoshitaka Hiromae

Toshiya Wada

Hajime Nitto

Hirotada Katoh

A coating composition including inorganic compounds dispersed in an organic material capable upon exposure to UV rays or electron beams of producing an adherent insulating film of high dielectric properties on the surfaces of electro-sheets of ferrous material. The coated electro-sheets are annealed after the forming, for example, cutting or punching operation in order to remove thereby imparted stresses without impairing the dielectric properties.

Insulating coating compositions applied on electrical steel sheets

An annealing separator useful for producing a grain oriented silicon steel strip having an excellent magnetic property, comprises non-hydrating magnesium oxide which has been calcined at a temperature of 1300.degree. C. or more, preferably, from 1300.degree. to 2100.degree. C., and which is in the form of fine particles, 70% by weight of which have a size of 5 microns or less, and optionally, magnesium hydroxide in an amount of 1 to 100% based on the weight of the magnesium oxide and/or an aluminium compound in an amount of 0.05 to 10% based on the weight of the magnesium oxide.

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Munakata, Japan

Kazuo Nakamura