Method of producing low iron loss, low-noise grain-oriented...

Details Method of producing low iron loss, low-noise grain-oriented... Method of producing low iron loss, low-noise grain-oriented...

C - Chemistry, Metallurgy

21

D

C21D 8/12 (2006.01) C21D 9/56 (2006.01) H01F 1/147 (2006.01) H01F 41/02 (2006.01)

Patent

CA 2088326

A grain oriented silicon steel sheet which exhibits reduced iron loss and which contributes excellent noise characteristics when used as a material of a stacked transformer. The sheet is produced by applying electron beam irradiation to a finish-annealed grain oriented silicon steel sheet, along scan paths which cross the rolling direction at a scanning speed V(cm/s) and a spacing L(cm) in the rolling direction, with an electron beam of a beam diameter d (cm) generated by a current Ib (mA) and acceleration voltage Vk (KV); wherein the surface energy density a (J/cm2) on the surface of said steel sheet as determined by the following formula (1) is about 0.16 J/cm or more, and said surface energy density a (J/cm2) and the surface energy density .beta. (J/cm2) on the scan paths meet the approximate condition of the following formula (3): .alpha. = (VkIb)/(Lv) ........ (1) .beta. = (VkIb)/(dv) ........ (2) 0.6 - 0.06.beta. .alpha. 0.90 - 0.08.beta. ........ (3) Disclosed also is a stacked transformer produced from this grain oriented silicon steel sheet.

L'invention est une tôle d'acier au silicium à grains orientés à pertes dans le fer réduites et à caractéristiques de bruit excellentes comme matériau pour transformateur à étages. La tôle est obtenue par l'irradiation, au moyen d'un faisceau électronique, d'une tôle d'acier au silicium à grains orientés recuite. L'irradiation est effectuée selon des trajets qui croisent la direction de laminage à une vitesse de balayage V (cm/s) et à un espacement L (cm) dans la direction du laminage. Le faisceau électronique a un diamètre d (cm) et est engendré par un courant Ib (mA) et une tension accélératrice Vk (kV). La densité d'énergie surfacique a (J/cm2) de la tôle déterminée par la formule (1) est d'environ 0,16 J/cm2 ou plus, et cette densité d'énergie surfacique a (J/cm2) et la densité d'unité surfacique (J/cm2) sur les trajets de balayage satisfont la condition approximative de la formule (3) qui suit : = (Vk ?????

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