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US 2025/0051869 A1Published application
Annealing separating agent composition for grain oriented electrical steel sheet and method for manufacturing grain oriented electrical steel sheet
AssigneePosco
InventorMin Serk KWON
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Abstract
An annealing separating agent composition for a grain oriented electrical steel sheet according to an embodiment of the present invention contains 25-80 wt % of a boron compound on the basis of 100 wt % of the total solid content, with the remainder comprising at least one among magnesium oxide and magnesium hydroxide.
Claims16
An annealing separating agent composition for a grain-oriented electrical steel sheet comprising:
- 25 to 80 wt % of boron and
- a remainder of one or more of magnesium oxide and magnesium hydroxide,
- based on a total of 100 wt % of the solid content.
A grain-oriented electrical steel sheet comprising:
- a grain-oriented electrical steel sheet substrate and
- a coating film which is placed on one or both surfaces of the grain-oriented electrical steel sheet substrate and includes boron and forsterite,
- wherein the coating film includes a boron agglomerate and the boron agglomerate has an average particle diameter of 1 to 500 nm.
A method for manufacturing a grain-oriented electrical steel sheet, the method comprising:
- preparing a steel slab;
- hot rolling the steel slab to manufacture a hot rolled sheet;
- cold rolling the hot rolled sheet to manufacture a cold rolled sheet;
- first recrystallization annealing the cold rolled sheet;
- applying an annealing separating agent on a surface of the first recrystallization annealed steel sheet;
- and
- second recrystallization annealing the steel sheet coated with the annealing separating agent,
- wherein the annealing separating agent includes 25 to 80 wt % of a boron compound and a remainder of one or more of magnesium oxide and magnesium hydroxide, based on a total of 100 wt % of the solid content.
5 more elements
Dependencies are inferred from the claim text.