Nippon Steel Corporation

Toshihiko Uemura

Takeshi Kubota

Fumiaki Takahashi

Masato Mizokami

Takahito Mizumura

Masao Yabumoto

Eisuke Minematsu

Ichiro Tachino

Masahiro Nakamoto

A wound core is formed by laminating a plurality of bent bodies formed from a grain-oriented electrical steel sheet having a coating containing phosphorus formed on a surface, in a sheet thickness direction of the grain-oriented electrical steel sheet, in which the bent body is formed in a rectangular shape by having four flat portions and four corner portions adjacent to the flat portions, the corner portion has a bent region having a total bending angle of approximately 90&#xb0; in a side view, the number of deformation twins present in the bent region in the side view is five or less per 1 mm of a length of a center line in the bent region in the sheet thickness direction, and the amount of phosphorus eluted from the corner portion in a case of being boiled in water for 30 minutes is 6.0 mg or less per 1 mof a surface area of the corner portion.

Wound core and manufacturing method thereof

A high strength non-oriented electrical steel sheet with good magnetic properties having a yield strength of .gtoreq.60 kg-f/mm.sup.2 and a yield point elongation of YP-El.gtoreq.0.3% comprising, by weight percent: up to 0.04% carbon; from 2.0% to less than 4.0% silicon; from zero percent to 2.0% aluminum; up to 0.2% phosphorus, and including one or more elements selected from manganese and nickel in an amount within the range 0.3%.ltoreq.Mn+Ni&lt;10%, with the remainder of iron and unavoidable impurities, and a method of manufacturing the steel.

High strength non-oriented electrical steel sheet and method of

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Tokyo, Japan

Toshihiko Uemura