Non-oriented electrical steel sheet and method for manufacturing same
AssigneePosco
InventorsHunju Lee, Su-Yong Shin, Yunsu Kim
Life of this patent
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Abstract
A non-oriented electrical steel sheet includes by wt %, Si: 3.0 to 4.0%, Al: 0.1 to 1.5%, Mn: 0.1 to 0.5%, Cr: 2 to 20% of Mn content, a sum of Sn and Sb: 0.006 to 0.1%, C: 0.0010 to 0.0050%, and 0.0003 to 0.0050% of at least one of N, S, Ti, Nb, and V, and balance being Fe and unavoidable impurities, in which an area fraction of a grain having a grain diameter which is 10% or less of a thickness of the steel sheet is 0.5% or more, a number fraction of the grain is 20% or more, and an average grain diameter from a central layer to a surface layer in a thickness direction of the steel sheet satisfies a relationship of D(surface)/D(center)≥0.6.
Claims4
A non-oriented electrical steel sheet, comprising:
- by wt %, Si:
- 3.0 to 4.0%, Al:
- 0.1 to 1.5%, Mn:
- 0.1 to 0.5%, Cr:
- 2 to 20% of Mn content, a sum of Sn and Sb:
- 0.006 to 0.1%, C:
- 0.0010 to 0.0050%, and 0.0003 to 0.0050% of at least one of N, S, Ti, Nb, and V, and balance being Fe and unavoidable impurities,
- wherein an area fraction of a grain having a grain diameter which is 10% or less of a thickness of the steel sheet is 0.5% or more, a number fraction of the grain is 20% or more, and an average grain diameter from a central layer to a surface layer in a thickness direction of the steel sheet satisfies a relationship of Equation 1 below,
- D(surface)/D(center)≥0.6 [Equation 1],
- wherein, in Equation 1, D (surface):
- represents average grain diameter of a region from the surface layer in the thickness direction of the steel sheet to a ¼ layer, D (center):
- represents an average grain diameter of a region from a central layer to the ¼ layer in the thickness direction of the steel sheet.
Dependencies are inferred from the claim text.