Non-oriented electrical steel sheet and method for preparing same
AssigneePosco
InventorsJae-Hoon Kim, Geun Ha Jun, So Hyun Park
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Abstract
A non-oriented electrical steel sheet according to an exemplary embodiment of the present invention includes, by weight, Si: 2.0 to 3.5%, Al: 0.3 to 2.5%, Mn: 0.3 to 3.5%, Sn: 0.0030 to 0.2%, Sb: 0.0030 to 0.15%, P: 0.0040 to 0.18%, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and a remainder including Fe and unavoidable impurities, and satisfies Equation 1 below. 0.05≤([Sn]+[Sb])/[P]≤25 [Equation 1] ([Sn], [Sb], and [P] respectively represent the content (% by weight) of Sn, Sb, and P.)
Claims14
A non-oriented electrical steel sheet comprising, by weight, Si:
- 2.0 to 3.5%, Al:
- 0.3 to 2.5%, Mn:
- 0.3 to 3.5%, Sn:
- 0.0030 to 0.2%, Sb:
- 0.0030 to 0.15%, P:
- 0.0040 to 0.18%, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and a remainder including Fe and unavoidable impurities, and satisfying Equation 1 below:
- 0.05≤([Sn]+[Sb])/[P]≤25 [Equation 1]
- ([Sn], [Sb], and [P] respectively represent the content (% by weight) of Sn, Sb, and P.)
A method for manufacturing a non-oriented electrical steel sheet, comprising:
- producing a slab including, by weight, Si:
- 2.0 to 3.5%, Al:
- 0.3 to 2.5%, Mn:
- 0.3 to 3.5%, Sn:
- 0.0030 to 0.2%, Sb:
- 0.0030 to 0.15%, P:
- 0.0040 to 0.18%, individually or in a total amount of 0.0005 to 0.03% of at least one of Ga and Ge, and a remainder including Fe and unavoidable impurities, and satisfying Equation 1;
- heating the slab;
- hot rolling the slab to produce a hot-rolled sheet;
- cold rolling the hot-rolled sheet to produce a cold-rolled sheet;
- and
- finally annealing the cold-rolled sheet:
- 0.05≤([Sn]+[Sb])/[P]≤25 [Equation 1]
- ([Sn], [Sb], and [P] respectively represent the content (% by weight) of Sn, Sb, and P.)
Dependencies are inferred from the claim text.