In comparison to the high magnetic field iron loss characteristics method of manufacturing the excellent grain-oriented electrical steel sheet in a low magnetic field iron loss characteristics

摘要

PROBLEM TO BE SOLVED: To improve the iron loss characteristic in a low magnetic field by controlling a slab heating temp., Al content and the combination of a hot-rolled sheet annealing temp. and decarburizing annealing temp. ;SOLUTION: In order to reduce the iron loss, secondary recrystallized grain is necessary to fine. For this purpose, the content of Al as an inhibitor component is made to in the range of 0.010-0.020wt.%. The steel adjusted with the component in such a way, is heated on the slab and this slab heating temp. is made to ≤1250°C. By this method, the good crystal grain distribution and the magnetic characteristics can be obtd. The slab in such a way, is hot-rolled, and successively, after applying the annealing to the hot-rolled sheet, cold-rolling is executed and further, the decarburize-annealing is executed. In order to fine the secondary recrystallized grain, the hot-rolled sheet annealing temp. x (°C) and the decarburized annealing temp. y (°C) are regulated so as to satisfy the following relations. 800≤x≤1000 and (-x/2)+1200≤y≤(-x/2)+1300.;COPYRIGHT: (C)1998,JPO