Abstract: As to a method of producing grain oriented silicon steel sheets used in stacked lamination-core transformers, which realizes the improvement of magnetic properties, particularly extreme reduction of iron loss irrespectively of a high temperature heat treatment such as strain relief annealing and can attain the improvement of compressive stress dependence of magnetostriction and lamination factor, it is a main point that the steel sheet after the finish annealing is provided on its surface with a thin coat of at least one layer composed mainly of nitrides and carbides of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to the surface of the steel sheet through a mixed layer of base metal and thin coat.

Abstract: An extra-low iron loss grain oriented silicon steel sheet comprises a base metal of silicon steel and a thin coat of nitride or carbide of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to a finished surface of the base metal through a mixed layer of the base metal and the thin coat, and has excellent electrical and magnetic properties as well as good compressive stress dependence of magnetostriction and lamination factor.

Abstract: A substrate for print circuit board comprising a steel sheet, a forsterite film layer formed on at least one surface of the steel sheet, and an insulating film layer formed on the forsterite film layer by baking a coating solution mainly consisting of a phosphate and colloidal silica. A print circuit board having a conductive pattern on the insulating film layer of the substrate for print circuit board, and methods of manufacturing the substrate and the print circuit board. One of typical methods of manufacturing the substrate for print circuit board comprises steps of applying an annealing separator mainly consisting of MgO on the steel sheet and annealing it to form a forsterite film layer, applying and baking a coating solution mainly consisting of the phosphate and colloidal silica onto the forsterite film layer to form an insulating film layer. The print circuit board is obtained by bonding the conductive pattern to the insulating film layer and annealing at a temperature range of not lower than 300.

Abstract: A method for obtaining grain-oriented silicon steel sheet with a very high magnetic flux density and a very low core loss by setting specific conditions for the decarburization and primary recrystallization annealing step within the series of steps performed for the manufacture of the grain-oriented silicon steel sheet. This method consists of setting the rate of temperature rise in the decarburization and primary recrystallization annealing step at no less than 10.degree. C./sec, dividing the decarburization and primary recrystallization annealing step into a first half and a second half, and restricting the temperature, time, and ratio P.sub.H.sbsb.2.sub.O /P.sub.H.sbsb.2 of the partial pressure of H.sub.2 O to the partial pressure of H.sub.2 of the atmosphere for each of these two halves within certain predefined ranges.

Abstract: Grain oriented silicon steel sheets or strips having high magnetic induction and ultra-low iron loss can be obtained by the intermediate annealing cycle containing a rapid heating and rapid cooling just before final cold rolling, wherein a first cold rolled sheet is rapidly heated from 500.degree. C. to 900.degree. C. at a heating rate of at least 50.degree. C./sec and the steel sheet heated in the intermediate annealing is rapidly cooled from 900.degree. C. to 500.degree. C. at a cooling rate of at least 5.degree. C./sec.

Abstract: Grain-oriented silicon steel sheets having a very high magnetic induction and a low iron loss are produced by using a small amount of Mo and Sb and a slight amount of at least one of Se and S as an inhibitor for growing crystal grains.