Nonoriented electrical steel sheet excellent in core loss

Details Nonoriented electrical steel sheet excellent in core loss Nonoriented electrical steel sheet excellent in core loss

2005-09-09

2009-10-27

Sheehan, John P. (Department: 1793)

Metal treatment

Stock

Magnetic

C148S111000, C148S121000, C148S306000, C148S307000

Reexamination Certificate

active

07608154

ABSTRACT:
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 1×1010[inclusions/mm3]. 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]×[Cu]3≧7.5×10−11  (1),in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?([REM]−0.003)0.1×[Cu]2≦1.25×10−4  (2).in-line-formulae description="In-line Formulae" end="tail"?

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Kurosawa et al., “Observations of Precipitates and Mettalographic Grain Orientation in Steel by a Non-aqueous Electrolyte-Potentiostatic Etching Method”, J. Japan Inst. Metals, vol. 43, 1979, pp. 1068-1077.

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