| 摘要 |
PURPOSE:To produce efficiently an ultra-iron loss grain-oriented steel sheet with economized energy by forming a film of an infilterative body to the grain- oriented electrical steel sheet subjected to finish annealing then heating the steel sheet by thermal irradiation and forming the infiltrated body at intervals. CONSTITUTION:The film of the infilterative body of a metal, non-metal, etc. is formed by painting, plating, etc., on the grain-oriented electrical steel sheet subjected to finish annealing. The steel sheet formed with the film is thermally irradiated by a pulse laser, etc. and is intermittently heated after drying of the film. The infilterative body is thereby brought into reaction with the steel sheet or the surface film thereof, etc., and the infiltrated body consisting of the alloy, result product of reaction, diffused body, etc., having the steel component or structure different from the component or structure of ferritic steel sheet is formed at intervals in the form of intruding into the sheet thickness direction. The magnetic domains are thus finely segmented without the loss of the effect of improving the iron loss even after the heat treatment such as stress relief annealing. The grain-oriented electrical steel sheet having extremely low iron loss is obtd. |
