Non-oriented electrical steel sheet and manufacturing method therefor
AssigneePosco
InventorsJae-Hong KIM, Jong Uk RYU, Seung Il KIM, Sin Young JUNG, Su Yong SIN, Sang Woo LEE
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Abstract
A non-oriented electrical steel sheet according to an embodiment of the present invention includes Ti at 0.0030 wt % or less (excluding 0 wt %), Nb at 0.0035 wt % or less (excluding 0 wt %), V at 0.0040 wt % or less (excluding 0 wt %), B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and other inevitably added impurities, wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) may be 0.17 to 7.8.
Claims13
A non-oriented electrical steel sheet comprising, based on 100 wt % of a total composition thereof, Ti at 0.0030 wt % or less (excluding 0 wt %), Nb at 0.0035 wt % or less (excluding 0 wt %), V at 0.0040 wt % or less (excluding 0 wt %), B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and impurities,
- wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) is 0.17 to 7.8:
- (herein, [Ti], [Nb], [V], and [B] represent an addition amount (wt %) of Ti, Nb, V, and B, respectively).
A manufacturing method of a non-oriented electrical steel sheet, comprising:
- heating a slab, based on 100 wt % of a total composition thereof, including Ti at 0.0030 wt % or less (excluding 0 wt %), Nb at 0.0035 wt % or less (excluding 0 wt %), V at 0.0040 wt % or less (excluding 0 wt %), B at 0.0003 wt % to 0.0020 wt %, and the remaining portion including Fe and impurities,
- wherein a value of ([Ti]+0.8[Nb]+0.5[V])/(10*[B]) is 0.17 to 7.8, and then hot rolling it to prepare a hot-rolled steel sheet;
- cold rolling the hot-rolled steel sheet to prepare a cold-rolled steel sheet;
- and
- annealing the cold-rolled steel sheet:
- (herein, [Ti], [Nb], [V], and [B] represent an addition amount (wt %) of Ti, Nb, V, and B, respectively).
Dependencies are inferred from the claim text.