Non-oriented electrical steel sheet and manufacturing method thereof
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United States of America Patent
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Apr 3, 2018
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Oct 15, 2015
filing date -
Feb 18, 2010
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Abstract
A manufacturing method of a non-oriented electrical steel sheet includes: performing finish annealing of a cold-rolled steel strip; and forming a tension-applying type insulating film of not less than 1 g/m2 and not more than 6 g/m2 on a surface of the cold-rolled steel strip. The performing the finish annealing includes forming an oxide layer containing Al2O3 or (Al, Cr)2O3 and having a thickness of not less than 0.01 μm and not more than 0.5 μm on the surface of the cold-rolled steel strip with setting a temperature of the cold-rolled steel strip to not lower than 800° C. and not higher than 1100° C. in an atmosphere where when the total content of Si and Al of the cold-rolled steel strip is represented as X (mass %), a partial pressure ratio of water vapor to hydrogen is equal to or less than 0.005×X2.
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