Provided is a grain-oriented electrical steel sheet including: a forsterite base film formed on a surface of the steel sheet; and an insulating tension coating formed on the base film, in which when Ti intensity FX(Ti), Al intensity FX(Al), and Fe intensity FX(Fe) obtained through quantitative analysis by performing fluorescent X-ray analysis on the surface of the steel sheet satisfy FX(Ti)/FX(Al)0.15 and FX(Ti)/FX(Fe)0.004, the frequency of crystal boundaries of secondary recrystallized grains in the direction orthogonal to the rolling direction is 20 grain boundaries/100 mm or less, the mean thickness of the forsterite base film t(Fo) and the thickness of the insulating tension coating t(C) satisfies t(Fo)/t(C)0.3, and magnetic domain refining treatment is performed by irradiation with a laser beam, plasma flame, or electron beam, a sufficient iron loss reducing effect is achieved in a range where coating detachment does not occur.

A method and a system for continuously in-line annealing a forwarding ferromagnetic amorphous alloy ribbon in a curved shape to improve its magnetic properties without causing the ribbon to become brittle and which operates at significant high ribbon feeding rates. The amorphous alloy ribbon is fed forward, tensioned and guided along a path at a preset feeding rate and is heated at a point along the path at a rate greater than 10.sup.3 C./sec to a temperature to initiate a thermal treatment. Then the ribbon is initially cooled at a rate greater than 10.sup.3 C./sec until the thermal treatment ends. During the thermal treatment, a series of mechanical constraints is applied on the ribbon until the amorphous alloy ribbon adopts a specific shape at rest after the thermal treatment is ended. After the initial cooling, the amorphous alloy ribbon is subsequently cooled at a sufficient rate to a temperature that will preserve the specific shape.

An FeCo-based alloy bar and a method for manufacturing same, whereby excellent magnetic properties can be reliably obtained. The method for manufacturing an FeCo-based alloy bar comprises a heating straightening step for applying tensile stress to a hot-rolled material of an FeCo-based alloy while heating the hot-rolled material to a temperature of 500-900 C. Preferably, ohmic heating is used in the heating straightening step. In addition, the FeCo-based alloy bar has 20% or more by area ratio of crystal grains having a grain orientation spread (GOS) value of at least 0.5.

An FeCo-based alloy bar and a method for manufacturing same, whereby excellent magnetic properties can be reliably obtained. The FeCo-based alloy bar has 20% or more by area ratio of crystal grains having a grain orientation spread (GOS) value of at least 0.5. The FeCo-based alloy bar contains 95% or more of Fe+Co in mass %.

In a non-oriented electrical steel sheet according to the present disclosure, TS is higher than 580 MPa, and when P.sub.120/Fe.sub.700 that is a ratio of a peak-to-peak value P.sub.120 of P around an electron energy of 120 eV to a peak-to-peak value Fe.sub.700 of Fe around an electron energy of 700 eV in Auger differential spectra obtained in a grain boundary region of a fracture surface is defined as [P].sub.GB, and P.sub.120/Fe.sub.700 that is a ratio of a P.sub.120 to Fe.sub.700 in Auger differential spectra obtained in an intragranular region of a fracture surface is defined as [P].sub.IG, the [P].sub.GB and the [P].sub.IG satisfy Formula (1). A difference S between TS and YP is 110 MPa or less, and an average grain size D (m) satisfies Formula (2).

[00001]$\begin{array}{cc}{\left[P\right]}_{GB}{/\left[P\right]}_{\mathrm{IG}}>2.& \left(1\right)\end{array}$$\begin{array}{cc}D100-15{\left[P\right]}_{GB}{/\left[P\right]}_{IG}+1500/\mathrm{TS}& \left(2\right)\end{array}$

The method includes slab-heating a steel slab to a temperature of higher than a -phase precipitation temperature and 1380 C. or lower, subjecting the steel slab to rough rolling including at least two passes of rolling at a predetermined temperature with an introduced sheet thickness true strain .sub.t of 0.50 or more and to finish rolling with a rolling finish temperature of 900 C. or higher to obtain a hot-rolled sheet, cooling the hot-rolled sheet for 1 second or longer at a cooling rate of 70 C./s or higher within 2 seconds after finish rolling, coiling the sheet at a coiling temperature of 600 C. or lower, performing hot-rolled sheet annealing for soaking at a predetermined soaking temperature, and then performing cold rolling, primary recrystallization annealing, and secondary recrystallization annealing.