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US 12,729,412 B2Granted
Method for manufacturing grain-oriented electrical steel sheet
AssigneeJfe Steel Corporation
InventorsTakashi Terashima, Takuya Yamada
Life of this patent
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Abstract
Provided is a method for manufacturing a grain-oriented electrical steel sheet with excellent uniformity of magnetic properties in the sheet transverse direction without increasing production costs. An ignition loss of an annealing separator after drying: IGLOSS (mass %), a storage time of a cold-rolled steel sheet: T (hr), and a carbon dioxide concentration in a storage environment of the cold-rolled steel sheet: A (mass ppm) satisfy the following formula (1): A × IGLOSS ≤ - 1500 × Ln ( T ) + 9000. ( 1 )
Claims7
A method for manufacturing a grain-oriented electrical steel sheet, comprising
- preparing a cold-rolled steel sheet having a chemical composition containing C:
- 0.0100 mass % or more and Si:
- 1.0 mass % or more,
- subjecting the cold-rolled steel sheet to decarburization annealing,
- applying a MgO-based annealing separator to a surface of the cold-rolled steel sheet and drying the annealing separator,
- coiling the cold-rolled steel sheet and then storing the cold-rolled steel sheet, and
- subjecting the cold-rolled steel sheet to final annealing,
- wherein an ignition loss of the annealing separator after drying:
- IGLOSS (mass %), a storage time of the cold-rolled steel sheet:
- T (hr), and a carbon dioxide concentration in a storage environment of the cold-rolled steel sheet:
- A (mass ppm) satisfy the following formula (1):
- A
- ×
- IGLOSS
- ≤
- -
- 1500
- ×
- Ln
-
- (
- T
- )
- +
- 9000
- ,
- (
- 1
- )
- and
- wherein IGLOSS is 1.3 mass % or more and 8.0 mass % or less, T is 4 hr or more and 384 hr or less, and A is 24 mass ppm or more and 1200 mass ppm or less.
28 more elements
Dependencies are inferred from the claim text.