Non-oriented electrical steel sheet having superior magnetic properties and method of manufacturing same
AssigneePosco
InventorsHun Ju LEE, Yong-Soo KIM, Su-Yong SHIN
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Abstract
The present invention relates to a non-oriented electrical steel sheet with excellent magnetism and a manufacturing method thereof. A non-oriented electrical steel sheet according to an embodiment of the present invention includes Si at 2.5 to 3.8 wt %, Al at 0.5 to 2.5 wt %, Mn at 0.2 to 4.5 wt %, C at 0.005 wt % or less (excluding 0 wt %), S at 0.005 wt % or less (excluding 0 wt %), N at 0.005 wt % or less (excluding 0 wt %), Nb at 0.004% or less (excluding 0 wt %), Ta at 0.0005 to 0.0025 wt %, and the balance of Fe and inevitable impurities.
Claims10
A non-oriented electrical steel sheet, comprising Si at 2.5 to 3.8 wt %, Al at 0.5 to 2.5 wt %, Mn at 0.2 to 4.5 wt %, C at 0.005 wt % or less (excluding 0 wt %), S at 0.005 wt % or less (excluding 0 wt %), N at 0.005 wt % or less (excluding 0 wt %), Nb at 0.004% or less (excluding 0 wt %), Ti at 0.004% or less (excluding 0 wt %), V at 0.004% or less (excluding 0 wt %), Ta at 0.0005 to 0.0025 wt %, and the balance of Fe and inevitable impurities.
A manufacturing method of a non-oriented electrical steel sheet, comprising:
- preparing a slab containing Si at 2.5 to 3.8 wt %, Al at 0.5 to 2.5 wt %, Mn at 0.2 to 4.5 wt %, C at 0.005 wt % or less (excluding 0 wt %), S at 0.005 wt % or less (excluding 0 wt %), N at 0.005 wt % or less (excluding 0 wt %), Nb at 0.004% or less (excluding 0 wt %), Ti at 0.004% or less (excluding 0 wt %), V at 0.004% or less (excluding 0 wt %), Ta at 0.0005 to 0.0025 wt %, and the balance of Fe and inevitable impurities;
- heating the slab;
- hot-rolling the heated slab to manufacture a hot-rolled sheet;
- cold-rolling the hot-rolled sheet to manufacture a cold-rolled sheet;
- and
- final-annealing the cold-rolled sheet to manufacture an electrical steel sheet.
Dependencies are inferred from the claim text.