High silicon steel sheet having excellent productivity and magnetic properties and method for manufacturing same

1. A method for manufacturing a high silicon steel sheet, the method comprising:

casting a molten metal by a strip casting machine as a strip having a thickness of 1 mm to 5 mm, the molten metal comprising, by weight %, C: 0.05% or less (excluding 0%), N: 0.05% or less (excluding 0%), Si: 4% to 6.3%, Al: 0.3% to 3%, Si+Al: 4.5% to 8%, and the balance of Fe and inevitable impurities;

hot-rolling the cast strip by a hot rolling mill at a temperature of 800° C. or higher;

annealing the hot-rolled strip at a temperature within a range of 900° C. to 1200° C.;

cooling the annealed strip at a rate of 100° C./sec to 200° C./sec to a temperature range of room temperature to 100° C.;

warm-rolling the cooled strip at a temperature within a range of 300° C. to 700° C.; and

annealing the warm-rolled strip at a temperature within a range of 800° C. to 1200° C.

2. The method of claim 1 , wherein the casting of the molten metal is performed under at least one of a nitrogen atmosphere and an argon atmosphere.

3. The method of claim 1 , wherein the annealing of the hot-rolled strip is performed under a non-oxidizing atmosphere.

4. The method of claim 3 , wherein the non-oxidizing atmosphere is at least one of a nitrogen atmosphere, an argon atmosphere, and a hydrogen and nitrogen mixture atmosphere.

5. The method of claim 1 , where the warm-rolling of the cooled strip is performed until the cooled strip has a final thickness of 0.5 mm or less.

6. The method of claim 1 , wherein the thickness of the strip is 1 mm to 2 mm.

7. The method of claim 1 , wherein the annealing of the hot-rolled strip is performed for 10 seconds to 5 minutes.

8. The method of claim 1 , wherein the annealing of the warm-rolled strip is performed for 10 seconds to 5 minutes.