A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%[% Sb]0.20% and 0.02%[% P]2.0[% Sb], with a balance being Fe and incidental impurities, wherein when the steel sheet is excited to 1.0 T at 50 Hz in a rolling transverse direction, a magnetizing force (TD-H.sub.10) and an iron loss (TD-W.sub.10) are respectively (TD-H.sub.10)200 A/m and (TD-W.sub.10)1.60 W/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost.

Provided is a way to inhibit propagation of edge cracks. A method of producing a grain-oriented electrical steel sheet including, before final annealing, local strain with an indentation amount from the steel sheet surface of 5 m to 30 m is applied to a linear region that, when coiled and the coil is charged into a final annealing furnace, is separated from the axial end of the coil that comes into contact with a coil receiving base of the final annealing furnace by 5 mm or more and 20 mm or less in the axial direction of the coil and that extends continuously or discontinuously in a direction on that intersects the axial direction, in order to produce crystal grains having a misorientation angle of 15 or more from Goss orientation grains along 50% or more of the total length of the linear region.

Provided is a non-oriented electrical steel sheet including silicon (Si): 2.8 wt % to 3.8 wt %, manganese (Mn): 0.2 wt % to 0.5 wt %, aluminum (Al): 0.5 wt % to 1.5 wt %, carbon (C): more than 0 wt % and not more than 0.003 wt %, phosphorus (P): more than 0 wt % and not more than 0.015 wt %, sulfur(S): more than 0 wt % and not more than 0.003 wt %, nitrogen (N): more than 0 wt % and not more than 0.003 wt %, titanium (Ti): more than 0 wt % and not more than 0.003 wt %, and a balance of iron (Fe) and other unavoidable impurities, wherein second-phase particles with an average diameter of 1.0 m or more among second-phase particles constituting a microstructure of the non-oriented electrical steel sheet have a volume fraction of 60% or more, and wherein the non-oriented electrical steel sheet has a core loss (W.sub.10/400) of 12.0 W/kg or less.

Provided is a non-oriented electrical steel sheet including carbon (C): more than 0 wt % and not more than 0.003 wt %, silicon (Si): 2.0 wt % to 4.0 wt %, manganese (Mn): 0.1 wt % to 0.5 wt %, aluminum (Al): 0.3 wt % to 0.9 wt %, phosphorus (P): more than 0 wt % and not more than 0.015 wt %, sulfur (S): more than 0 wt % and not more than 0.003 wt %, nitrogen (N): more than 0 wt % and not more than 0.003 wt %, titanium (Ti): more than 0 wt % and not more than 0.003 wt %, and a balance of iron (Fe) and other unavoidable impurities, wherein a final microstructure of the non-oriented electrical steel sheet satisfies Inequality 1:

[00001]$\mathrm{Inequality}1:0.00172\left[A\right]-0.0266\left[B\right]<2.0$ (where [A] represents an average number of second-phase particles in a steel sheet cross-section with an area of 1010 mm.sup.2, and [B] represents a volume fraction value (unit: %) of particles with an average size of 2 m or more among the second-phase particles.)

Provided is a method for manufacturing a grain-oriented electrical steel sheet. A steel slab having a specific chemical composition is heated and hot rolled. A hot-rolled steel sheet thus obtained is subjected to hot band annealing to obtain a cold-rolled steel sheet, which is then subjected to primary recrystallization annealing to obtain a primary recrystallized steel sheet. An annealing separator is applied to the primary recrystallized steel sheet, which is then coiled. The coil is subjected to secondary recrystallization annealing to obtain a grain-oriented electrical steel sheet having an average value of a deviation angle (.sup.2+.sup.2).sup.1/2 calculated from a deviation angle from ideal Goss orientation around an ND rotation axis and a deviation angle from ideal Goss orientation around a TD rotation axis of 4.5 or less, and an area ratio R.sub. of crystal grains with 0.50 of 15% or less.

A preparation method of glassless grain-oriented silicon steel includes the following operations. During a decarburization annealing, a thickness of an oxide film on a surface of strip is 1.5-2.5 m; an atomic weight ratio of Si element and Fe element in the oxide film satisfies: Si/(Si+Fe)0.76; during a high-temperature annealing, a cooling stage includes sequentially: cooling with an inner cover when a temperature drops from 1200 C. to 500 C.; wherein a protective gas is a mixed gas containing nitrogen and hydrogen, and a volume percentage of the hydrogen in the mixed gas is >3%; cooling with the inner cover when the temperature drops from 500 C. to 200 C.; wherein the protective gas is nitrogen; and cooling in air by removing the inner cover when the temperature is <200 C.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%Carbon0.007%, 0.21%Manganese0.7%, 3%Silicon3.6%, 0.7%Aluminum1.3%, Phosphorus0.15%, Sulfur0.006%, Nitrogen0.09%, with 3.85%Si+Al+Mn5.5%, and can contain various optional elements. The remainder composition being composed of iron and unavoidable impurities. The microstructure is ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, from 35% to 45% and simultaneously having a magnetic polarization at 5000 A/m (J50) from 1.63T to 1.66T.