Abstract: Decarburized grain oriented silicon steel is provided with an annealing separator which forms a glass film after the final high temperature anneal. The magnesia used as the annealing separator has a total chlorine level of 0.01 to 0.20% by weight based on the weight of magnesia with at least 0.01% metal chloride selected from the group of Mg, Ca, Na and K. The chloride addition acts to seal the coating surface during the final anneal to control diffusion and stabilize the secondary grain growth. The glass film which forms during the anneal may be laser scribed for domain refinement without coating damage. The magnesia may also contain additions of phosphates, TiO.sub.2, SiO.sub.2, Cr and B. The temperature of the magnesia is maintained below 25.degree. C. to control hydration and eliminate the need for other additives in the magnesia slurry to control hydration.

Abstract: A process for producing a grain-oriented electrical steel sheet having improved magnetic and surface film properties, comprising: using an electrical silicon steel slab containins S in an extremely small amount of 0.012 wt % or less and Mn in a limited range of 0.08 to 0.45 wt %; heating the slab to a relatively low temperature of not higher than 1200.degree. C.; hot-rolling the slab to form a hot-rolled strip; cold-rolling the strip to a thickness of a final product sheet; decarburization-annealing the cold-rolled strip; nitriding the strip while it is travelling; applying an annealing separator to the strip; and final texture-annealing the strip by heating the strip to a first temperature of from 800.degree. to 850.degree. C. in an atmosphere of (N.sub.2 +Ar).gtoreq.30 vol % with 25 vol % or more N.sub.2 and the remainder H.sub.2 and subsequently heating from the first temperature to above 1200.degree. C. in a conventional atmosphere.

Abstract: A process for producing a grain-oriented electrical steel sheet having a high magnetic flux density, comprising the steps of: heating a steel slab comprising 1.8 to 4.8 wt % Si, 0.012 to 0.050 wt % acid-soluble A1, 0.010 wt % or less N, and the balance consisting of Fe and unavoidable impurities, to a temperature for hot rolling; hot-rolling the heated slab to form a hot-rolled strip; cold-rolling the hot-rolled strip to a final product sheet thickness at a final cold rolling reduction of 80% or more by a single step of cold rolling or by two or more steps of cold rolling with an intermediate annealing step inserted therebetween; primary-recrystallization-annealing the cold-rolled strip; final-annealing the primary-recrystallization-annealed strip so that secondary-recrystallized grains substantially completely grow up in a temperature region of from 1000.degree. to 1100.degree. C. and then purification is effected above 1100.degree. C.

Abstract: A grain oriented silicon steel sheet having a low iron loss and not causing degradation of properties even through strain relief annealing is produced by applying ultrasonic vibrations to the surface of the sheet after secondary recrystallization annealing.

Abstract: The present invention realizes the stable production of grain oriented silicon steel sheets having excellent magnetic properties under high productivity through effectively combining aging treatment with tandem rolling, in which cold rolling is effected until a final thickness is attained. In the final cold rolling step of the production of the grain oriented silicon steel sheets, the tandem rolling is first effected, and then continuous heat treatment is effected, preferably under application of tension.

Abstract: A method for forming an insulating film on a grain-oriented silicon steel sheet by applying an insulating coating solution comprising100 parts by weight (calculated as the solid component) of a mixture of colloidal substances, composed of 50 to 98 weight % (calculated as the solid component SiO.sub.2) of colloidal silica having a partical diameter not larger than 50 nano m, and 2 to 50 weight % (calculated as the solid component) of at least one colloidal substance having a particle diameter randing from 80 to 3000 nano m, selected from the group consisting of oxides, carbides, nitrides, sulfides, borides, hydroxides, silicates, carbonates, borates, sulfates, nitrates and chlorides of Fe, Ca, Ba, Zn, Al, Ni, Sn Cu, Cr, Cd, Nd, Mn, Mo, Si, Ti, W, Bi, Sr, and V,130 to 250 parts by weight of at least one selected from the group consisting of phosphates of Al, Mg, Ca, and Zn, and10 to 40 parts by weight of at least one selected from the group consisting of chromic anhydride, chromate, and dichromate.

Abstract: A grain-oriented silicon steel sheet having a low iron loss free from deterioration due to the stress-relief annealing, can be obtained by forming on its surface a forsterite film locally having regions, which have a thickness different from that of the remaining regions in the film, or locally having filmless regions which do not coat the steel sheet surface.

Abstract: An oriented silicon steel sheet having a very high magnetic flux density is produced from an oriented silicon steel containing AlN as the main inhibitor and also containing Sb by a method adapted to prevent the loss of the inhibiting ability of the surface layer of the steel, and to improve cooling conditions in annealing before the final cold rolling. The steel is hot rolled, subjected to at least one time the combination of annealing and cold rolling wherein the final cold rolling is performed with a rolling reduction of about 80 to 95%, subjected to decarburization and primary recrystallization annealing, and subjected to, after coating an annealing separation agent, final finish annealing. Before annealing is performed before the final cold rolling, a nitriding promoter is applied to the surface of the steel sheet, and the partial-pressure ratio of N.sub.2 in the atmosphere for that annealing is adjusted to a value of not less than about 20%.

Abstract: A process for producing a grain-oriented electrical steel sheet having an excellent magnetic characteristic, comprising the steps of: heating to a temperature lower than 1280.degree. C. a steel slab comprising 0.025 to 0.075 wt % C, 2.5 to 4.5 wt % Si, 0.010 to 0.060 wt % acid-soluble Al, 0.0030 to 0.0130 wt % N, 0.014 wt % or less (S+0.405 Se), 0.05 to 0.

Abstract: An electrical steel sheet having a very small watt loss can be provided by improving the conventional magnetic domain-controlling treatment. Namely, a high-flux density, grain-oriented electrical steel sheet having a superior watt loss characteristic and a flux density of at least 1.88 T at a magnetizing force of 800 A/m, which comprises, as the steel sheet components, up to 0.0030% by weight of C, 2.8 to 4.5% by weight of Si, 0.045 to 0.100% by weight of Mn, up to 0.0050% by weight of one or two elements selected from the group consisting of S and Se, up to 0.0050% by weight of Al, up to 0.0030% by weight of N, 0.03 to 0.25% by weight of Sn, 0.35 to 2.0% by weight of Ni and if necessary, 0.03 to 0.

Abstract: A method of producing grain oriented silicon steel sheets each having a low watt loss, at an inexpensive cost and a high operational efficiency, wherein surfaces of each silicon steel sheet are given a mirror surface is disclosed. After completion of a finish annealing, forsterite films on the surface of each grain oriented silicon steel sheet are removed therefrom, and thereafter, the silicon steel sheet is annealed within the temperature range of 1000.degree. C. or higher in an atmosphere composed of a mixture gas comprising 20 to 80% by volume of hydrogen gas and 0 to 80% by volume of an inert gas, whereby surfaces of the silicon steel sheet are given a mirror surface. Subsequently, tensile stress additive films are formed on the surfaces of the silicon steel sheet, and consequently, the resultant silicon steel sheet exhibits a remarkably reduced watt loss.

Abstract: The production of grain oriented silicon steel sheets comprises a combination of hot rolling step, cold rolling step, decarburization and primary recrystallization annealing step, annealing separator applying step and secondary recrystallization annealing and purification annealing step. In this case, the cold rolled sheet is subjected to an electrolytic degreasing in a silicate bath containing an iron concentration of 50-5000 mg/l, and Cu is adhered to the surface(s) of the sheet after the decarburization and primary recrystallization annealing in an amount of 400-2000 mg/m.sup.2 per one-side surface.

Abstract: A process of aluminizing magnetic steel sheets is disclosed. The process involves annealing a steel sheet in order to achieve partial secondary recrystallization, providing aluminum on the steel sheet, preferably by vacuum evaporation or immersion, and subjecting the steel sheet to a further heat treating step in order to diffuse the aluminum into the sheet and decrease impurities therein. Preferably, the partial secondary recrystallization anneal is performed in a neutral atmosphere such as nitrogen, while the final heat treating step is performed in a hydrogen atmosphere, and at a higher temperature than the above annealing step.

Abstract: A method is provided for improving the electrical characteristics of grain-oriented silicon steel sheet by heating the steel to temperatures above 1000.degree. F. and then deforming grooves to refine the magnetic domains, optionally, post heat treating to form fine recrystallized grains in the vicinity of the hot deformations, preferably using protrusions on a scribing roll as the sheet moves between a scribing roll and a back-up anvil roll at deforming pressures range up to 120,000 pounds per square inch.

Abstract: An improvement in a method for improving the magnetic domain wall spacing of grain-oriented silicon steel sheet having an insulating coating thereof, wherein the sheet is subjected to metallic contaminants, particularly phosphorus and phosphorus compounds, to refine magnetic domains, followed by a rolling procedure, followed by a stress relief anneal to provide a smooth surface on the sheet and reduced core loss.

Abstract: The thermal flattening of grain oriented silicon steel which is in the semi-processed condition has improved magnetic properties after a stress relief anneal by using a low temperature and high tension flattening anneal. The flattening process is conducted at a temperature between 1000.degree. to 1435.degree. F. (540.degree. to 780.degree. C.) with a tension selected to produce a yield strength/tension ratio from above 5 to about 20 and preferably from 7 to 13. The yield strength of the material will vary depending on the length of the time at peak temperature but are typically from 400 to 4000 psi (29,200 to 292,000 gm/cm.sup.2). The material as thermally flattened will have at least about 10% stress. After a stress relief anneal above about 1450.degree. F. (785.degree. C.), the material has significantly improved core loss compared to conventional thermally flattened material. The material is particularly suited for wound transformer core applications.

Abstract: The present invention relates to a method for producing high silicon steel strip in a continuous treatment line through chemical vapor deposition (called "CVD" hereinafter), wherein the steel strip is subjected continuously to siliconization at temperatures between 1023.degree. and 1200.degree. C. by CVD in a non-oxidizing gas atmosphere containing SiCl.sub.4 between 5% and 35% in molar fraction. Subsequently a diffusion treatment is performed in a non-oxidizing gas atmosphere not containing SICl.sub.4 for diffusing Si uniformly throughout the steel strip, which is then cooled and coiled. If required, the steel strip may be coated with an insolating film and subjected to a baking treatment, before cooling and coiling.

Abstract: A method of producing an oriented electrical steel sheet having superior magnetic properties comprises the steps of, hot rolling a slab containing 0.8 to 6.8% of Si, 0.008% of Al acid soluble, the balance being Fe and accompanying impurities, by weight to form a strip, cold rolling the strip, primary-recrystallization annealing, coating the strip with an annealing separator, and finishing annealing, a nitriding treatment being effected after the primary recrystallization annealing but before the start of the secondary recrystallization of the finishing annealing. According to the present invention, with an atmosphere oxidizing degree (PH.sub.2 O/PH.sub.2): x in a soaking process in said primary recrystallization annealing an annealing is effected in an atmosphere which has an oxidizing degree (PH.sub.2 O/PH.sub.2): y in a range defined by the following inequality, at a temperature ranging from 650.degree. to 800.degree. C. in the heating process, for at least 5 secs.

Abstract: A method is provided to effect domain refinement of grain-oriented silicon steel sheets having a surface layer of forsterite by applying to the layer a phosphorus-rich flux-printing agent having a desired composition, and degree of fluidity in a sufficient amount to effect removal of the forsterite layer in a striped pattern with sufficient phosphorus to subsequently chemically stripe the underlying metal with phosphide-bearing bodies to produce in the steel a heat-proof domain refinement with improved lower core loss values, after first heating in an oxidizing atmosphere and second heating in a reducing atomsphere.

Abstract: A method of producing non-oriented magnetic steel plate having high magnetic flux density in a low magnetic field and uniform magnetic properties through the thickness direction, comprising selection of a heating temperature and finish rolling temperature to coarsen the size of the austenite grains and prevent refinement of the grain size in the rolling process, and annealing the steel after it has been rolled.

Abstract: The present invention relates to a process for preparing a unidirectional silicon steel sheet having a high magnetic flux density which comprises heating a silicon steel slab comprising by weight 0.025 to 0.075% of carbon, 2.5 to 4.5% of silicon, 0.015% or less of sulfur, 0.010 to 0.050% of acid-soluble aluminum, 0.0010 to 0.012% of nitrogen, 0.050 to 0.45% of manganese and 0.01 to 0.10% of tin and optionally 0.0005 to 0.0080% of boron with the balance being iron and unavoidable impurities, at 1200.degree. C.

Abstract: A method is provided to reduce the core loss measured at frequencies of 60 Hz or higher in light-gauge, grain-oriented, silicon steel sheet or strip of less than 7 mil thickness and conventional permeability of .mu.10<1850 at 60 Hz, the method includes coating such steel with tension-inducing stress coatings in order to exert tensile stresses on the silicon steel of at least approximately 600 psi and further provides a method with the step of preparing the surfaces of the light-gage, grain-oriented, silicon steel products to support the stresses of the applied tension-inducing stress coatings in order to prevent spalling of the coatings.

Abstract: An improvement in a method for improving the magnetic domain wall spacing of grain-oriented silicon steel sheet having an insulating coating thereof, wherein the sheet is subjected to metallic contaminants, particularly phosphorus and phosphorus compounds, to refine magnetic domains, followed by a rolling procedure, followed by a stress relief anneal to provide a smooth surface on the sheet and reduced core loss.

Abstract: The adhesiveness of a glass film and watt loss of a grain-oriented electrical steel sheet is improved by partially protruding the glass film into the steel sheet part thereof. To attain the partial protrusion, the steel sheet is subjected, prior or subsequent to decarburization annealing, to a treatment of the surface thereof to form unevennesses, by a mechanical device, e.g., brush rolling, buff polishing, marking-off, sand papering, and grinding.

Abstract: Permanent domain refinement of grain oriented electrical steel strip is obtained in a high speed two-stage process. The process removes the glass in narrow regions which just expose the base metal. An electrolytic etch is then used to deepen the region into the base metal and minimize damage to the remaining glass film. Control of acid concentration and temperature in the electrolytic bath allows a greater increase in productivity. A further feature of the process is the use of permeability measurements to optimize the depth of the etched regions. The improved core loss produced by the process will survive a stress relief anneal.

Abstract: The present invention relates to a process for producing permanent domain refinement continuously and at very high line speeds in grain oriented electrical steel having an aluminum nitride inhibitor system. After the final high temperature anneal, the glass film and insulative coating on the surface is removed in narrow bands (grooves or rows of spots). The steel is electroetched to increase the depth of the bands, coated with aluminum by electrophoresis and given a stress relief anneal to bond the aluminum coating to the base metal by diffusion. A localized stress field is induced during cooling which causes domain refinement due to the differential thermal contraction between the aluminum and the base metal.

Abstract: The present invention provides a grain-oriented electrical steel sheet having a thickness of up to 0.17 mm and excellent product magnetic characteristics. The present invention is characterized in that a silicon containing acid-soluble Al, N and Sn is used as the starting material, the N and acid-soluble Al contents in the slab are adjusted to 0.0050 to 0.0100% and {(27/14).times.N (%)+0.0035} to {(27/14).times.N (%)+0.0100}%, respectively, the thickness of the hot-rolled sheet is adjusted so that the thickness reduction ratio at the one-stage cold-rolling is 85 to 92%, and the Nas AlN content in the hot-rolled steel sheet is controlled to 0.0005 to 0.0020%.

Abstract: A process for producing a grain-oriented steel sheet having superior magnetic and surface film characteristics, which comprises the steps of: heating to a temperature of 1200.degree. C. or lower an electrical steel slab comprising 0.025 to 0.075 wt % C, 2.5 to 4.5 wt % Si, 0.012 wt % or less S, 0.010 to 0.060 wt % acid-soluble Al, 0.010 wt % or less N, 0.080 to 0.045 wt % Mn, and the balance consisting of Fe and unavoidable impurities; hot-rolling the heated slab to form a hot-rolled steel sheet; cold-rolling the hot-rolled sheet to a final product sheet thickness by single cold rolling step or by two or more steps of cold rolling with an intermediate annealing therebetween; decarburization-annealing the cold-rolled sheet under a condition such that decarburization alone is effected until primary-recrystallized grains grow to an average grain size of at least 15 .mu.

Abstract: The present invention relates to an improvement in the technique of heating an electrical steel slab at a low temperature. A grain-oriented electrical steel sheet having excellent magnetic characteristics and film characteristics is prepared by the process characterized in that a slab comprising, as main ingredients, up to 0.012% by weight of S, 0.010 to 0.060% by weight of acid-soluble Al, up to 0.010% by weight of N, 0.08 to 0.45% by weight of Mn, and 0.015 to 0.045% by weight is used as the starting slab, and after the decarburization annealing, the nitriding treatment is carried out at a temperature of 500.degree. to 900.degree. C. in an atmosphere having an NH.sub.3 gas concentration of at least 1000 ppm, while running the strip.

Abstract: The magnetic properties, particularly magnetic flux density of a grain oriented silicon steel sheet are considerably improved by continuously and/or stepwise forming regions, wherein a temperature difference of a secondary recrystallization starting temperature in widthwise direction and/or longitudinal direction of the steel sheet is within a range of 10.degree. C. to 200.degree. C., in the steel sheet at a stage before the secondary recrystallization annealing step.

Abstract: Grain-oriented silicon steel having an insulation coating such as a forsterite layer on its outer surface, on which is scribed by a low pressure abrasion technique a predetermined pattern of stripes to expose the metal substrate, in a manner that little or no effect will be experienced with respect to magnetic properties, but will constitute essential preparation for improvement in properties when chemical treatment of the exposed metal stripes is performed.

Abstract: A grain-oriented silicon steel sheet having a low iron loss, due to the subdividing effect of magnetic domain wall spacing, free from deterioration due to the stress-relief annealing, can be obtained by forming on its surface a forsterite film locally having regions, which have a thickness different from that of the remaining regions in the film, or locally having filmless regions which do not coat the steel sheet surface.

Abstract: Disclosed is a process for preparing a thin grain oriented electrical steel sheet having a final thickness of 0.05 to 0.25 mm from a silicon steel slab comprising 0.050 to 0.120% by weight of C, 2.8 to 4.0% by weight of Si and 0.05 to 0.25% by weight of Sn, wherein the starting silicon slab further comprises up to 0.035% by weight of S and 0.005 to 0.035% by weight of Se, with the proviso that the total amount of S and Se is in the range of 0.015 to 0.060% by weight, 0.050 to 0.090% by weight of Mn, with the proviso that the Mn content is in the range of {1.5.times.[content (% by weight) of S+content (% by weight) of Se[} to {4.5.times.[content (% by weight) of S+content (% by weight) of Se[} % by weight, 0.0050 to 0.0100% by weight of N, and {[27/14].times.content (% by weight) of N+0.0030} to {[27/14].times.content (% by weight) of N+0.0150} % by weight of acid-soluble Al.

Abstract: By adding an appropriate amount, 1 to 12 weight percent, based on the amount of magnesium oxide present and Loss On Ignition values of powdered magnesium metal to the magnesium oxide aqueous slurry composition used to make a separating-agent composition in the making of grain-oriented silicon electrical steel, there are obtained composition, an article, and a method characterized principally by a substantial decrease in the rate of rejections of the produce of the final texturizing anneal because of coating defects--such difficulties as bare spots, and metal-overlay pattern. Moreover, the magnetic properties may be improved because of improved control of the propagation of the internally oxidized zone of the steel.

Abstract: Disclosed is a process for the preparation of a grain oriented silicon steel about sheet having a high flux density, which comprises hot-rolling a slab comprising 1.5 to 4.8% by weight of Si, 0.012 to 0.050% by weight of Al, 0.0010 to 0.0120% by weight of N, 0.0020 to 0.0150% by weight of Ti, up to 0.45% by weight of Mn and up to 0.012% by weight of at least one member selected S and Se, which satisfies the requirement 0.06 to 0.6 of Ti/N (at % ratio) and Mn/(S+Se).gtoreq.4.0 (weight ratio) with the balance comprising Fe and unavoidable impurities, to cold-rolling, performing decarburization annealing, coating an annealing separator on the steel sheet surface, then performing finish annealing, and performing a nitriding treatment of the steel sheet during the period of from the point of termination of final cold rolling to the point of initiation of secondary recrystallization at the finish annealing step.

Abstract: In the production of a grain-oriented electrical steel sheet, instead of conventional inhibitors a novel (Al, Si)N inhibitor is utilized. This inhibitor is formed by obtaining an incomplete solution of Al and N and then nitriding the decarburization annealed steel sheet prior to initiation of a secondary recrystallization. The fine inhibitor can be formed in a large amount, thereby enhancing the magnetic flux density.

Abstract: A method is provided for domain refinement of electrical sheet products, such as grain-oriented silicon steel and amorphous magnetic materials, by subjecting at least one surface of the steel to an electron beam treatment to produce narrow substantially parallel bands of treated regions separated by untreated regions substantially transverse to the direction of strip manufacture to improve core loss without damaging the surface or any coating thereon.

Abstract: A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel having a forsterite base coating thereon by removing portions of the base coating to expose a pattern of the underlying silicon steel, providing the exposed silicon steel with an environment selected from the group of phosphorus and phosphorus-bearing compounds, and then annealing the exposed steel, which is free of thermal and plastic stresses, in the phosphorus environment in a reducing atmosphere to produce in the steel a line of permanent bodies containing a phosphorus-bearing compound to effect heat resistant domain refinement and reduced core loss.A semi-finished sheet product of final texture annealed grain-oriented silicon steel is also provided.

Abstract: An extra-low iron loss grain oriented silicon steel sheet is produced by irradiating electron beam to an insulation coating formed on a grain oriented silicon steel sheet after finish annealing in a direction crossing the rolling direction of the sheet, whereby the magnetic properties are not degraded even if the steel sheet is subjected to a strain relief annealing. If necessary, an inert gas may be introduced into the vicinity of electron beam irradiated zone of the coating.

Abstract: A method is provided for domain refinement of final texture annealed grain-oriented silicon steels by applying to the base coating a barrier coating for sealing the forsterite, removing portions of the base coating to expose a pattern of the underlying silicon steel, applying a metallic contaminant to the steel at least in the areas of the exposed steel which is free of thermal and plastic stresses, and thereafter annealing the steel having the barrier coating and contaminant thereon at time and temperature in a reducing atmosphere to diffuse sufficient and controlled amounts of the metallic contaminant and an element from the barrier coating into the exposed steel to produce a permanent pore to effect heat resistant domain refinement and reduced core loss.

Abstract: A method is provided for refining the magnetic domain wall spacing of grain-oriented silicon steel sheet having an insulation base coating thereon by removing portions of the base coating to expose a line pattern of the underlying silicon steel substantially transverse to the rolling direction of the steel, applying a metallic contaminant to the steel, the exposed steel being free of thermal and plastic stresses, and thereafter annealing the steel and contaminant thereon at time and temperatures of about 1400.degree. F. or more in a protective atmosphere to diffuse sufficient and controlled amounts of the comtaninant into the steel to produce a permanent pore stable up to 2100.degree. F. to effect heat resistant domain refinement and reduce core loss.

Abstract: Oriented silicon steel is heated in a slab furnace at temperatures above 1260.degree. C. prior to hot rolling. The slab surfaces in the furnace are exposed to molten slag, variable atmosphere conditions and refractory interaction from the hearth. The slab surface prior to hot rolling has a major importance for cold rolling and the quality of the glass film.A rapid oxidation treatement of the slab just prior to the scale breaker or first rolling stand corrects a silicon-free iron layer condition which causes streaks in the glass film. The oxidation treatment blows gas having at least 30% oxygen for a sufficient time and velocity to provide a surface which will develop a continuous fayalite layer in subsequent processing and provide for the formation of a continuous glass film.

Abstract: The adhesiveness of a glass film and watt loss of a grain-oriented electrical steel sheet is improved by partially protruding the glass film into the steel sheet part thereof. To attain the partial protrusion, the steel sheet is subjected, prior or subsequent to decarburization annealing, to a treatment of the surface thereof to form unevenness, by a mechanical device, e.g., brush rolling, buff polishing, marking-off, sand papering, and grinding.

Abstract: A method of producing grain-oriented electrical steel sheet with a very high magnetic flux density, is characterized by increasing the partial pressure of the N.sub.2 in the annealing atmosphere at the intermediate stage between the start and the finish of the secondary recrystallization, and by ensuring the temperature differential in the coil does not exceed 100.degree. C. during changes to the annealing atmosphere. In addition, the rate of temperature increase at the hottest part of the coil is kept to a maximum of 13.degree. C./hr at least part of the time the coolest part of the coil is between 850.degree. C. and 1100.degree. C.

Abstract: A method for the selective decarburization of an iron based substrate, such as a silicon iron substrate, wherein the carbon present in the substrate is extracted by the selective deposition of a titanium nitride layer or film on the substrate.

Abstract: A method is provided for producing cube-on-edge grain-oriented silicon steel by producing 3 to 10 ppm boron and a manganese-to-sulfur and/or selenium ratio of at least 2.5 in a final gauge steel strip prior to final texture annealing and including a two-stage cold reduction wherein the final cold reduction is less than 75% to provide a steel having improved magnetic properties with a secondary grain size of less than 10 mm and a permeability of 1850 or more at 10 oersteds.

Abstract: A method for producing grain-oriented electrical steel sheet having metallic luster and excellent punching property comprises the steps of decarbonization annealing a grain-oriented electrical steel sheet which has been cold rolled to a final thickness, coating the decarbonization-annealed sheet with an annealing separator consisting of magnesium blended with one or more salts of alkali metal or alkaline-earth metal, and finish annealing the coated sheet.

Abstract: By adding an appropriate amount, 1 to 12 weight percent, based on the amount of magnesium oxide present and Loss On Ignition values of powdered magnesium metal to the magnesium oxide aqueous slurry composition used to make a separating-agent composition in the making of grain-oriented silicon electrical steel, there are obtained composition, an article, and a method characterized principally by a substantial decrease in the rate of rejections of the product of the final texturizing anneal because of coating defects--such difficulties as bare spots, and metal-overlay pattern. Moreover, the magnetic properties may be improved because of improved control of the propagation of the internally oxidized zone of the steel.

Abstract: A rapidly quenched Fe-Si alloy containing 6 to 7 wt % Si is heat treated to promote and control an order-disorder reaction, thereby improving its ac core loss and exciting power at induction levels above B=1.2 T. The alloy has a substantially <100> texture, a grain size of about 1 to 2 mm, a B2 domain size of 100 to 850 nm, a DO3 domain size of about 5 to 25 nm, an ac core loss of about 1.2 to 1.6 W/kg and an exciting power of about 15 to 46 VA/kg, the core loss and exciting power being measured at an induction level of B=1.4 T and a frequency of f=60 Hz.

Abstract: Method for subdividing the magnetic domains of a grain-oriented electrical steel sheet is improved so that the watt loss can be further lessened and the watt-loss improving effect does not disappear during stress relief annealing. An intrudable means is formed on the finishing-annealed steel sheet on or in the vicinity of strain which promotes the intrusion of an intrudable means. Sb or Sb containing material is a preferred intrudable means and the laser irradiation is a preferred method for imparting the strain and also for attaining the removal of a surface coating.