Grain-oriented electrical steel sheet, iron core of transformer, transformer, and method for reducing noise of transformer
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United States of America Patent
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Feb 6, 2024
Grant Date -
Oct 31, 2019
app pub date -
Nov 17, 2017
filing date -
Dec 28, 2016
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Abstract
A grain-oriented electrical steel sheet having an insulating film disposed on a surface thereon. The insulating film having a chemical composition comprising Si, P, O, and at least one selected from the group consisting of Mg, Ca, Ba, Sr, Zn, Al, Mn, and Co. The insulating film has a crystallinity in a range of 20% or more, and a minimum tension provided to the steel sheet by the insulating film at a temperature in a range of 100° C. to 200° C. is 10 MPa or more.
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