Grain-oriented electrical steel sheet and method for manufacturing same
Provided is a grain-oriented electrical steel sheet that has excellent magnetic properties and can be manufactured by secondary recrystallization orientation control using coil annealing with high productivity. A grain-oriented electrical steel sheet comprises a specific chemical composition, wherein an average value of a deviation angle (α 2 +β 2 ) 1/2 calculated from a deviation angle α from ideal Goss orientation around an ND rotation axis and a deviation angle β from ideal Goss orientation around a TD rotation axis is 5.0° or less, and an area ratio R β of crystal grains with β≤0.50° is 20% or less.
1. A grain-oriented electrical steel sheet comprising
a chemical composition containing, in mass %,
C: 0.005% or less,
Si: 3.0% or more and 4.0% or less,
Mn: 0.05% or more and 0.50% or less,
sol. Al: 0.001% or less,
N: 0.0015% or less,
S: 0.0010% or less, and
Se: 0.0010% or less,
with the balance being Fe and inevitable impurities,
wherein an average value of a deviation angle (α 2 +β 2 ) 1/2 calculated from a deviation angle α from ideal Goss orientation around an ND rotation axis and a deviation angle β from ideal Goss orientation around a TD rotation axis is 4.5° or less, and
an area ratio R β of crystal grains with β≤0.50° is 15% or less.
2. The grain-oriented electrical steel sheet according to claim 1 , wherein an average value of a deviation angle γ from ideal Goss orientation around an RD rotation axis is 3.0° or more and 7.0° or less.
3. The grain-oriented electrical steel sheet according to claim 1 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of
Sb: 0.005% or more and 0.1% or less,
Sn: 0.005% or more and 0.1% or less,
P: 0.005% or more and 0.1% or less,
Ni: 0.005% or more and 1.5% or less,
Cu: 0.005% or more and 1.5% or less,
Cr: 0.005% or more and 0.1% or less,
Mo: 0.005% or more and 0.5% or less,
Ti: 0.0005% or more and 0.1% or less,
Nb: 0.0005% or more and 0.1% or less,
V: 0.0005% or more and 0.1% or less,
B: 0.0002% or more and 0.0025% or less,
Bi: 0.005% or more and 0.1% or less,
Te: 0.0005% or more and 0.01% or less, and
Ta: 0.0005% or more and 0.01% or less.
4. The grain-oriented electrical steel sheet according to claim 2 , wherein the chemical composition further contains, in mass %, one or more selected from the group consisting of
Sb: 0.005% or more and 0.1% or less,
Sn: 0.005% or more and 0.1% or less,
P: 0.005% or more and 0.1% or less,
Ni: 0.005% or more and 1.5% or less,
Cu: 0.005% or more and 1.5% or less,
Cr: 0.005% or more and 0.1% or less,
Mo: 0.005% or more and 0.5% or less,
Ti: 0.0005% or more and 0.1% or less,
Nb: 0.0005% or more and 0.1% or less,
V: 0.0005% or more and 0.1% or less,
B: 0.0002% or more and 0.0025% or less,
Bi: 0.005% or more and 0.1% or less,
Te: 0.0005% or more and 0.01% or less, and
Ta: 0.0005% or more and 0.01% or less.