Abstract: A grain oriented silicon steel sheet which exhibits reduced iron loss and which contributes excellent noise characteristics when used as a material of a stacked transformer. The sheet is produced by applying electron beam irradiation a finish-annealed grain oriented silicon steel sheet, along scan paths which cross the rolling direction at a scanning speed v(cm/s) and a spacing L(cm) in the rolling direction, with an electron beam of a beam diameter d (cm) generated by a current I.sub.b (mA) and acceleration voltage V.sub.k (kV);wherein the surface energy density .alpha. (J/cm.sup.2) on the surface of said steel sheet as determined by the following formula (1) is about 0.16 J/cm.sup.2 or more, and said surface energy density .alpha. (J/cm.sup.2) and the surface energy density .beta. (J/cm.sup.2) on the scan paths meet the approximate condition of the following formula (3):.alpha.=(V.sub.k .multidot.I.sub.b)/(L.multidot.v) (1).beta.=(V.sub.k .multidot.I.sub.b)/(d.multidot.v) (2)0.6-0.06 .beta..ltoreq..alpha..

Abstract: A method of irradiating a continuously-running strip with energy beams. Scanning the width of continuously-running strip positions energy-beam irradiating devices along the width of the strip. Allocation of scanning regions along the width of the strip corresponding to respective energy-beam irradiating devices is determined. When an edge deviation or strip wind is detected by a strip-edge detector upstream of the energy-beam irradiating devices, the strip regions to be scanned are adjusted. If the amount of strip wind exceeds the limits of the scannable energy-beam irradiating devices, neighboring irradiating devices are re-oriented, all in response to upstream strip wind detection.

Abstract: An electron beam irradiating apparatus continuously irradiates a running metal strip with an electron beam. An electron beam source can deflect the electron beam. At least one standby target is provided to receive the electron beam from the electron beam gun in a standby period in which the metal strip is not intended to be irradiated.

Abstract: A cutting device for collecting a quantoback analysis sample in a hot state from a preferred position of a continuously cast steel piece is disclosed. According to this invention, a dish like recess is cut on the surface of a cast steel piece while leaving a center column, then the root of the center column is cut and the cut free portion taken out as a sample.

Abstract: The iron loss is reduced by irradiating plasma flame to the surface of the grain oriented silicon steel sheet, wherein the irradiation interval (l) of plasma flame is controlled so as to satisfy the following equation (1):22-2.5D.ltoreq.l.ltoreq.36-2.5D (1)(D is an average secondary recrystallized grain size of the steel sheet).

Abstract: A method and a device for collecting a quantoback analysis sample in hot state from a preferred position of a continuously cast steel piece are disclosed. According to this invention, a dish like recess is cut on the surface of cast steel piece while leaving a center column, then the root of left center column is root cut and taken out as sample. A cutting device and a way for accessing the cutting device are presented for operating this process.