Grain-oriented electrical steel sheet and manufacturing method of grain-oriented electrical steel sheet
An oriented electrical steel sheet includes Ba at about 0.005 wt % to about 0.5 wt % inclusive, Y at about 0.005 wt % to about 0.5 wt % inclusive, or a composite of Ba and Y at about 0.005 wt % to about 0.5 wt % inclusive, the remainder including Fe and impurities, based on 100 wt % of a total composition of a base steel sheet thereof.
1. An oriented electrical steel sheet comprising
Ba at about 0.005 wt % to about 0.5 wt % inclusive, or a composite of Ba and Y at about 0.005 wt % to about 0.5 wt % inclusive, wherein Ba and Y are included in the composite of Ba and Y, and
the remainder including Fe and impurities, based on 100 wt % of a total composition of a base steel sheet thereof,
wherein the base steel sheet thereof includes:
Si at about 1.0 wt % to about 7.0 wt % inclusive,
C at about greater than 0 wt % and 0.0050 wt % or less,
Al at about greater than 0 wt % and 0.005 wt % or less,
N at about greater than 0 wt % and 0.0055 wt % or less, and
S at about greater than 0 wt % and 0.0055 wt % or less, and Mn at about 0.01 wt % to about 0.5 wt % inclusive.
2. The oriented electrical steel sheet of claim 1 , wherein
an area of grains of the electrical steel sheet having a grain size of about 2 mm or less is about 10% or less with respect to 100% of an area of total grains.
3. The oriented electrical steel sheet of claim 2 , wherein
an average size of grains of the electrical steel sheet having a grain size of about 2 mm or more is about 10 mm or more.
4. The oriented electrical steel sheet of claim 3 , wherein an angular difference between a <100> plane and a plate plane of the electrical steel sheet is about 3.5° or less.
5. The oriented electrical steel sheet of claim 4 , wherein B 10 corresponding to magnetic flux density of the electrical steel sheet measured at a magnetic field of about 1000 A/m is about 1.88 or more.
6. The oriented electrical steel sheet of claim 1 , wherein Ba, Y, or a combination thereof is segregated at grain boundaries of the electrical steel sheet.
7. The oriented electrical steel sheet of claim 1 , comprising
a composite of Ba and Y at about 0.005 wt % to about 0.5 wt % inclusive, wherein Ba and Y are both included in the composite of Ba and Y.
8. The oriented electrical steel sheet of claim 7 , wherein Ba is segregated at grain boundaries of the electrical steel sheet.
9. A manufacturing method of an oriented electrical steel sheet, comprising: heating a slab including Ba at about 0.005 wt % to about 0.5 wt % inclusive, Y at about 0.005 wt % to about 0.5 wt % inclusive, or a composite of Ba and Y at about 0.005 wt % to about 0.5 wt % inclusive, the remaining portion including Fe and other inevitably incorporated impurities, based on 100 wt % of a total composition of the slab;
producing a hot-rolled steel sheet by hot-rolling the slab;
producing a cold-rolled steel sheet by cold-rolling the hot-rolled steel sheet;
performing primary recrystallization annealing for the cold-rolled steel sheet; and
performing secondary recrystallization annealing for an electrical steel sheet for which the primary recrystallization annealing is completed,
thereby producing the oriented electrical steel sheet of claim 1 .
10. The manufacturing method of the oriented electrical steel sheet of claim 9 , wherein the slab includes Si at about 1.0 wt % to about 4.5 wt % inclusive, C at about 0.001 wt % to about 0.1 wt % inclusive, Al at about 0.005 wt % or less, N at about 0.0055 wt % or less, S at about 0.0055 wt % or less, and Mn at about 0.01 wt % to about 0.5 wt % inclusive.
11. The manufacturing method of the oriented electrical steel sheet of claim 9 , wherein a slab heating temperature in the heating of the slab is about 1280° C. or lower.
12. The manufacturing method of the oriented electrical steel sheet of claim 11 , wherein a soaking temperature in the secondary recrystallization annealing is about 900° C. to about 1250° C. inclusive.
13. The manufacturing method of the oriented electrical steel sheet of claim 12 , wherein after the hot-rolling, hot-rolled steel sheet annealing is performed.
14. The manufacturing method of the oriented electrical steel sheet of claim 13 , wherein in the primary recrystallization annealing, the cold-rolled steel sheet is maintained at a temperature of 750° C. or higher for about 30 seconds or more.
15. An oriented electrical steel sheet comprising
Ba at about 0.005 wt % to about 0.5 wt % inclusive, and
the remainder including Fe and impurities,
based on 100 wt % of a total composition of a base steel sheet thereof,
wherein the base steel sheet thereof includes:
Si at about 1.0 wt % to about 7.0 wt % inclusive,
C at about greater than 0 wt % and 0.0050 wt % or less,
Al at about greater than 0 wt % and 0.005 wt % or less,
N at about greater than 0 wt % and 0.0055 wt % or less,
S at about greater than 0 wt % and 0.0055 wt % or less, and
Mn at about 0.01 wt % to about 0.5 wt % inclusive.
16. The oriented electrical steel sheet of claim 15 , wherein Ba is segregated at grain boundaries of the electrical steel sheet.