摘要:
Provided is a grain-oriented electrical steel sheet which exhibits an excellent noise property in an actual transformer. Magnetostrictive properties of the grain-oriented electrical steel sheet are set such that there are four acceleration/deceleration points of the magnetostrictive speed level dλ/dt within one period of magnetostrictive vibration, and the speed level change amount of adjacent speed change points in the acceleration region or the deceleration region of the magnetostrictive vibration is 3.0×10-4sec-1 or less.
摘要:
A grain-oriented electrical steel sheet having a forsterite base film and an insulating tension coating on the surface thereof, wherein if magnetic domain refinement processing is performed by using a laser beam, a plasma flame, or electron beam irradiation, a sufficient iron loss reduction effect is achieved within a range in which film peeling does not occur, said effect being achieved by: the relationships FX(Ti)/FX(Al) ≥ 0.15 and FX(Ti)/FX(Fe) ≥ 0.004 being satisfied if FX(Ti) is Ti strength, FX(Al) is Al strength, and FX(Fe) is Fe strength when the surface has been quantitatively analysed by X-ray fluorescence analysis; furthermore, the grain boundary frequency of secondary recrystallised grains in the direction perpendicular to rolling being 20 boundaries/100 mm or less; and moreover, the relationship t(Fo)/t(C) ≥ 0.3 being satisfied if t(Fo) is the average thickness of the forsterite base film and t(C) is the thickness of the insulating tension coating.
摘要:
Die Erfindung betrifft ein kornorientiertes Elektroblech mit einer elektrisch isolierenden Beschichtung aus einem amorphen Kohlenstoff-Wasserstoff-Netzwerk, welche nach der Schlussglühung aufgetragen wird, um für die Verwendung des kornorientierten Elektroblechs, z. B. in Transformatoren, die elektrische Isolierung der einzelnen Blechschichten zu gewährleisten. Die Erfindung betrifft ferner ein Verfahren zur Herstellung des kornorientierten Elektroblechs mit einer elektrisch isolierenden Beschichtung aus einem amorphen Kohlenstoff-Wasserstoff-Netzwerk, welches darin besteht, dass die Beschichtung des bandförmigen Blechsubstrats mit der elektrisch isolierenden Beschichtung in einem kontinuierlichen Banddurchlaufverfahren erfolgt.
摘要:
An ultra-low iron loss unidirectional silicon steel sheet suitable for use as a core material for transformers and other electrical devices. It is far superior to conventional unidirectional silicon steel sheets in iron loss and space factor by forming two or more layers of ceramic tension films made of a nitride and/or a carbide over a smoothened surface or a grooved surface of a unidirectional silicon steel finished annealed sheet in such a way that the thermal expansion coefficient of the ceramic tension films decreases toward the outside and the outermost ceramic tension film is an electrical insulator.
摘要:
Provided is a treatment solution for a chromium-free tension coating, which can be prepared using an inexpensive Ti source without requiring the use of an expensive Ti chelate, and can simultaneously achieve both excellent hygroscopicity resistance and a high iron loss-reducing effect that is produced as a result of being imparted with high tension. A treatment solution for a chromium-free tension coating, which comprises at least one phosphoric acid salt selected from phosphorus acid salts of Mg, Ca, Ba, Sr, Zn, Al, and Mn, colloidal silica in an amount of 50 to 120 parts by mass in terms of SiO2 solid content relative to 100 parts by mass of the phosphoric acid salt, a Ti source in an amount of 30 to 50 parts by mass in terms of TiO2 content relative to 100 parts by mass of the phosphoric acid salt, and H3PO4, wherein the number of moles of a metal element in the phosphoric acid salt and the number of moles of phosphorus in the treatment solution satisfy the relationship represented by formula (1). (1) 0.20 ≤ ([Mg]+[Ca]+[Ba]+[Sr]+[Zn]+[Mn]+1.5[Al])/[P] ≤ 0.45
摘要:
Provided is a grain-oriented electrical steel sheet, subjected to magnetic domain segmentation through the repeated linear introduction of strain in a direction intersecting the rolling direction of a steel sheet at intervals in the rolling direction. The grain-oriented electrical steel sheet is characterized in that when the interval of repetition of the strain in the rolling direction is made d (mm) and, when the steel sheet is placed on a flat surface, the mean value of the difference between the height from the flat surface at the center of a linear section of the surface of the steel sheet where the strain was introduced and the height from the flat surface at the equal division point of an interval between the linear sections is made h (mm), the ratio of h to d, (h/d), is in the range 0.0025-0.015 inclusive.