Ultra-low iron loss grain-oriented silicon steel sheet
AssigneeKawasaki Steel Corporation
InventorYukio Inokuti
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Abstract
Ultra-low iron grain-oriented silicon steel sheet which is made by forming a ceramic tensile coating including at least inner and outer portions of a nitride and/or a carbide, the outer portion having a coefficient of thermal expansion that is lower than that of the inner portion, and wherein the outermost portion has an insulating property.
Claims18
An ultra-low iron loss grain-oriented silicon steel sheet comprising a grain-oriented silicon steel sheet having a ceramic tensile coating, wherein said ceramic tensile coating comprises at least two portions, one being an outer portion comprising a ceramic tensile coating formed on an outer surface thereof, and one being an inner portion comprising a ceramic tensile coating portion which is positioned between said outer portion and said steel surface,
- wherein said portions are selected from the group consisting of a nitride, carbide and combination thereof;
- and
- wherein said outer tensile coating portion has a coefficient of thermal expansion that is lower than the coefficient of thermal expansion of said inner tensile coating portion;
- and
- wherein said outer portion of said ceramic tensile coating is an insulating coating;
- and wherein said grain oriented silicon steel sheet has a thickness of about 0.05 to 0.5 mm.
A method of making a ultra-low iron loss grain-oriented silicon steel sheet having superior iron loss and lamination factors, comprising:
- forming a ceramic tensile coating, wherein said ceramic tensile coating comprises at least two portions, one being an outer portion comprising a ceramic tensile coating formed on an outer surface thereof, and one being an inner portion comprising a ceramic tensile coating portion which is positioned between said outer portion and said steel surface,
- wherein said portions are selected from the group consisting of a nitride, carbide and combination thereof;
- and
- wherein said outer tensile coating portion has a coefficient of thermal expansion that is lower than the coefficient of thermal expansion of said inner tensile coating portion;
- and
- wherein said outer portion of said ceramic tensile coating is an insulating coating;
- and wherein said grain oriented silicon steel sheet has a thickness of about 0.05 to 0.5 mm.
Dependencies are inferred from the claim text.