Nippon Steel Corporation

Hirotada Katoh

Osamu Tanaka

Shozaburo Nakashima

Toshiya Wada

Yoshitaka Hiromae

Takaaki Yamamoto

Kazuo Nakamura

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

Annealing separator for heat treatment of a silicon steel sheet comprising not more than 0.2% SO.sub.3, not more than 0.04% Cl with the balance being MgO and unavoidable impurities, and having a bulk density between 0.18 and 0.30 g/cm.sup.3, and a particle size distribution of 40 to 70% of particles not larger than 3.mu.m, 10 to 25% of particles not smaller than 10.mu.m, not more than 15% of coarse particles larger than 15.mu.m with the balance being intermediate particles between 3.mu.m and 10.mu.m.

Annealing separator for heat treatment of silicon steel sheets

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Kitakyushu, Japan

Hirotada Katoh