Nippon Steel Corporation

Wataru O-hashi

Takeshi Kubota

Masafumi Miyazaki

Yousuke Kurosaki

A nonoriented electrical steel sheet excellent in core loss comprising copper sulfides with a sphere-equivalent radius of 100 nm or less, wherein the number density of the copper sulfides is less than 1&#xd7;10[inclusions/mm]. Preferably, the percentage of the number of copper sulfides with a (major axis)/(minor axis) ratio of more than 2 per total number of copper sulfides is 30% or less. The steel preferably further comprises Cu of 0.5 mass % or less and REM of 0.0005% or more and 0.03% or less, wherein the following expression (1) or expressions (1) and (2) are met:[REM]&#xd7;[Cu]&#x2267;7.5&#xd7;10&#x2003;&#x2003;(1),([REM]&#x2212;0.003)&#xd7;[Cu]&#x2266;1.25&#xd7;10&#x2003;&#x2003;(2).

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Futtu, Japan

Wataru O-hashi