| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicon steel sheet with low coercive force while obviating the necessity of decarburizing annealing and high-temp. long-time annealing, by specifying the amount of acid-insoluble Al in particular among components. SOLUTION: An investigation of secondary recrystallizability on various sheet thickness shows that a relationship is held among sheet thickness, amount of acid-insoluble Al, and magnetic properties. That is, in the case where the sheet thickness, (t)(mm), of a final cold rolled steel sheet and the amount of acid-insoluble Al, insol.Al (ppm), in a hot rolled steel plate satisfy the relation of insol.Al×t <= 8.0, a silicon steel having excellent characteristic of <=10.0A/m coercive force can be obtained. It can be speculated that, in the case where sheet thickness is large, surface energy reduces pinning due to fine inclusions such as alumina and sufficiently functions as a driving force for abnormal grain growth though its influence decreases with the increase of sheet thickness. Practically, preferred thickness of the final cold rolled sheet is <=0.4mm.
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