Grain oriented electrical steel sheet and method for manufacturing same
AssigneePosco
InventorsJae-Song Kim, Il-Nam Yang, Seonghoon Min
Life of this patent
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Abstract
A grain oriented electrical steel sheet according to an exemplary embodiment of the present invention includes a grain oriented electrical steel sheet base material and a metal oxide layer present on both sides of the grain oriented electrical steel sheet base material. A maximum Al fraction in the metal oxide layer is 0.15 to 1.0 wt %, and a ratio (DWL/DWS) of an average magnetic domain width (DWL) of a side with a large average magnetic domain width to an average magnetic domain width (DWS) of a side with a small average magnetic domain width of one side and the other side of the electrical steel sheet base material is 1.2 to 1.8.
Claims13
A grain oriented electrical steel sheet comprising:
- a grain oriented electrical steel sheet base material;
- and
- a metal oxide layer present on both sides of the grain oriented electrical steel sheet base material,
- wherein a maximum Al fraction in the metal oxide layer is 0.15 to 1.0 wt %, and
- wherein a ratio (DWL/DWS) of an average magnetic domain width (DWL) of a side with a large average magnetic domain width to an average magnetic domain width (DWS) of a side with a small average magnetic domain width of one side and the other side of the electrical steel sheet base material is 1.2 to 1.8.
A method for manufacturing a grain oriented electrical steel sheet comprising:
- manufacturing a hot-rolled steel sheet by hot-rolling a slab;
- manufacturing a cold-rolled steel sheet by cold-rolling the hot-rolled steel sheet;
- subjecting the cold-rolled steel sheet to primary recrystallization annealing;
- subjecting the primary recrystallization annealed steel sheet to secondary recrystallization annealing;
- and
- performing a magnetic domain refinement treatment on one side of the secondary recrystallization annealed steel sheet,
- wherein, in the primary recrystallization annealing, a dew point of an atmosphere is 69 to 72.5° C., and
- wherein, in the magnetic domain refinement treatment, an input energy is 6.5 to 10 J/m.
Dependencies are inferred from the claim text.