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US 2026/0209878 A1Published application
Non-oriented electrical steel sheet and method for manufacturing same
AssigneePosco
InventorsJaewan HONG, Sangwoo LEE, Junesoo PARK
Life of this patent
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Abstract
A non-oriented electrical steel sheet according to an embodiment of the present invention includes, in wt %, Si: 3.0 to 5.0%, Mn: 0.1 to 1.4%, and Al: 0.3 to 1.3%, with the balance being Fe and inevitable impurities. In the non-oriented electrical steel sheet according to the embodiment of the present invention, when a 5 mm×5 mm area on the surface is observed, the length of unevenness having a height difference of 1.0 μm or more compared to the average height may be 3 mm or less.
Claims18
A non-oriented electrical steel sheet comprising:
- in wt %, Si:
- 3.0 to 5.0%, Mn:
- 0.1 to 1.4%, and Al:
- 0.3 to 1.3%, with a balance being Fe and inevitable impurities,
- wherein, when observing a 5 mm×5 mm area of a surface thereof, a length of unevenness having a height difference of 1.0 μm or more with respect to an average height is 3 mm or less.
2 more elements
A method for manufacturing a non-oriented electrical steel sheet, comprising:
- a step of hot rolling a slab including, in wt %, Si:
- 3.0 to 5.0%, Mn:
- 0.1 to 1.4%, and Al:
- 0.3 to 1.3%, with a balance being Fe and inevitable impurities, to manufacture a hot-rolled sheet;
- a step of cold rolling the hot-rolled sheet to manufacture a cold-rolled sheet;
- and
- a step of annealing the cold-rolled sheet,
- wherein, in the step of the hot rolling, a speed at which a front end portion of a rough-rolled bar is charged into a hot finish rolling mill is 300 m/min to 800 m/min, and a speed at which a rear end portion of the rough-rolled bar is charged is 1.25 times or more the speed of the front end portion thereof.
5 more elements
Dependencies are inferred from the claim text.