| 摘要 |
PURPOSE:To save energy and to reduce process period in manufacture by a method in which the stock of an unidirectional electromagnetic steel sheet containing specified amount of Si is made into the finished sheet by way of hot roll and cold roll and decarburization annealing and secondary recrystallization annealing are achieved in one process, while coating the finished sheet with an annealing separation reagent. CONSTITUTION:After the stock of an unidirectional silicon steel sheet containing 2-4wt% Si is hot-rolled and then is cold rolled, a finally finished sheet with specified thickness is obtained. This finally finished sheet is coated with an annealing separation reagent and decarburization and secondary recrystallization are successively carried out, while carrying out said decarburization annealing and secondary recrystallization annealing in one process. Thus, the unidirectional silicon steel sheet is obtained. As the annealing separation reagent, the material containing one or more kinds of carbonate or silicate family compounds of alkali metal or alkali earth metal by 1-50% and residual MgO, is used. |
