Nippon Steel Corporation

Takatoshi Egawa

Osamu Tanaka

Teruaki Izaki

Seizun Higuchi

Toshiya Wada

Yashichi Oyagi

Hidejiro Asano

Makoto Yoshida

Makato Yoshida

A grain-oriented electromagnetic steel sheet has an ultra low watt loss and heat resistant subdivided magnetic domains. The electromagnetic steel sheet has spaced apart regions of plastic strain and an insulating coating disposed thereon. Intruders are thermally intruded into the spaced apart regions of plastic strain causing the subdivided magnetic domains to be heat resistant and maintaining the subdivided magnetic domains after stress relief annealing. Preferred intruders include Sb and Sb containing materials.

Grain-oriented electrical steel sheet having a low watt loss

Method for subdividing the magnetic domains of a grain-oriented electrical steel sheet is improved so that the watt loss can be further lessened and the watt-loss improving effect does not disappear during stress relief annealing. An intrudable means is formed on the finishing-annealed steel sheet on or in the vicinity of strain which promotes the intrusion of an intrudable means. Sb or Sb containing material is a preferred intrudable means and the laser irradiation is a preferred method for imparting the strain and also for attaining the removal of a surface coating.

Method for producing a grain-oriented electrical steel sheet having a

A method for treating the surface of a steel sheet adapted for use in making a container or can is provided. A nickel-defused layer is first formed while recrystallization annealing is conducted, upon which layer a film of chromium is plated after temper rolling or double cold rolling. The good lacquer adhesion property of the Cr layer and the good formability of the Ni layer will synergetically act so as to give an excellent anti-corrosion property to a material for cans.

Method for the manufacture of a steel sheet having a Ni-diffused base

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Kitakyushu, Japan

Takatoshi Egawa