| 摘要 |
PURPOSE:To form a unidirectional electromagnetic steel plate with superior iron loss and high magnetic flux density by a method wherein Cu is added to a molten silicon steel including a very small amoung of Al and Sn. CONSTITUTION:Sn of 0.03-0.5% and Cu of 0.02-0.3% are compounded and added to basic component consisting of C:0.085% or less, Si:2.5-4.0%, acid soluble Al:0.010-0.050%, Mn:0.03-0.15%, S:0.01-0.050%, N:0.0045-0.012%. Next, normal hot rolling is applied to the silicon steel material composed of the above component and the silicon steel material is rolled for hot rolled coil. Furthermore, final plate thickness is obtained by successive one-stage cold rolling or a plural stages of cold rolling including intermediate annealing. Rolling rate at the final rolling shall be 80% or more. Decarbonizing annealing is then applied to the cold rolled plate rolled to the final plate thickness by a normal method. |
