Annealing separator composition for grain-oriented electrical steel sheet, grain-oriented electrical steel sheet, and method for producing grain-oriented electrical steel sheet
AssigneePosco
InventorsMin Serk Kwon, Chang Soo Park, Heon-Jo Choi, Se-Min Park
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Abstract
The present invention provides an annealing separator composition, a grain-oriented electrical steel sheet and a method for manufacturing a grain-oriented electrical steel sheet. An annealing separator composition for a grain-oriented electrical steel sheet according to an embodiment of present invention comprising: on the basis of total solid 100 wt %, 5 to 70 wt % of mullite; and the remainder being magnesium oxide or magnesium hydroxide.
Claims20
An annealing separator composition for a grain-oriented electrical steel sheet comprising:
- on the basis of total solid 100 wt %, 5 to 70 wt % of mullite;
- at least one of 0.1 to 20% of metal hydroxide, 0.5 to 10% of ceramic powder and 1 to 10% of Sb2(SO4)3, SrSO4, BaSO4 or a combination thereof;
- and
- the remainder being magnesium oxide or magnesium hydroxide.
A grain-oriented electrical steel sheet wherein a coating comprising mullite and forsterite is formed on one or both sides of a substrate of a grain-oriented electrical steel sheet.
A method for manufacturing a grain-oriented electrical steel sheet comprising:
- preparing a steel slab;
- heating the steel slab;
- hot rolling the heated steel slab to produce a hot rolled sheet;
- cold rolling the hot rolled sheet to produce a cold rolled sheet;
- primary recrystallization annealing the cold rolled sheet;
- applying an annealing separator to the surface of the primary recrystallization annealed steel sheet;
- and
- secondary recrystallization annealing the steel sheet applied with the annealing separator thereto,
- wherein the annealing separator comprises:
- on the basis of total solid 100 wt %, 5 to 70 wt % of mullite;
- and the remainder being magnesium oxide or magnesium hydroxide.
Dependencies are inferred from the claim text.