| 摘要 |
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 1x10<SUP>10 </SUP>[inclusions/mm<SUP>3</SUP>]. 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: <?in-line-formulae description="In-line Formulae" end="lead"?>[REM]x[Cu]<SUP>3</SUP>>=7.5x10<SUP>-11</SUP>, (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>([REM]-0.003)<SUP>0.1</SUP>x[Cu]<SUP>2</SUP><=1.25x10<SUP>-4</SUP>. (2)<?in-line-formulae description="In-line Formulae" end="tail"?>
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