Grain oriented electrical steel sheet and method for manufacturing the same

摘要

A grain oriented electrical steel sheet has a total length of cracks in a film on a steel sheet surface, of 20 μm or less per 10000 μm2 of the film, wherein magnetic domain refinement interval in a rolling direction of the steel sheet, provided in magnetic domain refinement through substantially linear introduction of thermal strain from one side of the steel sheet corresponding to a winding outer peripheral side of a coiled steel sheet at a stage of final annealing in a direction intersecting the rolling direction; and deflection of 3 mm or less per unit length: 500 mm in the rolling direction of the steel sheet.

主权项

1. A grain oriented electrical steel sheet having a total length of cracks in a film on a steel sheet surface, of 20 μm or less per 10000 μm2 of the film, wherein:
magnetic domain refinement interval D (mm) in a rolling direction of the steel sheet, provided in magnetic domain refinement through substantially linear introduction of thermal strain from one side of the steel sheet corresponding to a winding outer peripheral side of a coiled steel sheet at a stage of final annealing in a direction intersecting the rolling direction; and deflection of 3mm or less per unit length: 500 mm in the rolling direction of the steel sheet, wherein D satisfies:
0.5/(Δβ/10)≦D≦1.0/(Δβ/10), Δβ (°) represents variation of angle β (angle formed by <001> axis closest to the rolling direction, of crystal grain, with respect to the steel sheet surface) per unit length: 10 mm in the rolling direction within a secondary recrystallized grain of the steel sheet, and Δβis 0.4° to 3.3°.