# US 2018/0022927 A1 · Electrical steel sheet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0022927 A1 - Document ID: US20180022927A1 - Status: Published application - Kind: A1 - Application number: 15/545,760 - Filed: 2016-02-02 - Published: 2018-01-25 - Earliest claimed: 2015-02-05 - Assignees: Nippon Steel & Sumitomo Metal Corporation - Applicants: Nippon Steel & Sumitomo Metal Corporation - Inventors: Kazutoshi TAKEDA; Kenji KOSUGE; Tatsuya TAKASE; Koji MUNEDA - Web page: https://patentgrep.com/patent/US20180022927A1 ## CPC - C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances - B05D 1/06: Applying particulate materials - B05D 3/0254: {After-treatment} - B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) - C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes - C09D 7/40: Additives - C21D 8/1283: {Application of a separating or insulating coating} - C22C 38/02: containing silicon - C22C 38/04: containing manganese - C22C 38/06: containing aluminium - C23C 22/34: containing fluorides or complex fluorides - C23C 22/36: containing also phosphates - H01F 1/18: with insulating coating - C08L 27/00: Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers - C08L 33/00: Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers - C21D 2201/05: Grain orientation - C22C 2202/02: Magnetic - C23C 2222/20: Use of solutions containing silanes - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B) - C22C: ALLOYS (treatment of alloys C21D, C22F) - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract An electrical steel sheet has an insulating coating on a steel sheet surface. The insulating coating includes one or more selected from an inorganic salt, an oxide, and an organic resin. The insulating coating includes the inorganic salt and/or the oxide in an amount of 50% or more by mass in total based on the total mass of the insulating coating. The insulating coating has a fluorine concentration ranging from 2 ppm to 130 ppm. The insulating coating is free of a chromium compound. The insulating coating of this electrical steel sheet has excellent coating compatibility. ## Claims ### Claim 1 An electrical steel sheet having an insulating coating on a steel sheet surface, wherein the insulating coating comprises one or more selected from an inorganic salt, an oxide and an organic resin, wherein the insulating coating contains, based on a total mass of the insulating coating, 50% or more by mass in total of: the inorganic salt and/or the oxide, has a fluorine concentration ranging from 2 ppm to 130 ppm, and is free of a chromium compound. ### Claim 2 (depends on 1) The electrical steel sheet according to claim 1, wherein the insulating coating contains, based on a total mass of the insulating coating, 50% or more by mass in total of: a metal phosphate, and; one selected from, or a mixture or a copolymer of two or more selected from an acrylic resin, an epoxy resin, and a polyester resin. ### Claim 3 (depends on 1) The electrical steel sheet according to claim 1, wherein the insulating coating contains, based on a total mass of the insulating coating, 50% or more by mass in total of: the oxide, and; one selected from, or a mixture or a copolymer of two or more selected from an acrylic resin, an epoxy resin, and a polyester resin. ### Claim 4 (depends on 2) The electrical steel sheet according to claim 2, wherein the insulating coating contains, based on a total mass of the insulating coating, 50% or more by mass in total of: 100 parts by mass of the metal phosphate including one or more metal elements selected from aluminum, zinc, calcium, cobalt, strontium, zirconium, titanium, nickel, barium, magnesium and manganese, and; 1 to 50 parts by mass of one selected from, or a mixture or a copolymer of two or more selected from the acrylic resin, the epoxy resin, and the polyester resin. ### Claim 5 (depends on 3) The electrical steel sheet according to claim 3, wherein the insulating coating contains, based on a total mass of the insulating coating, 50% or more by mass in total of: 100 parts by mass of the oxide including one or more selected from colloidal silica, zinc oxide, calcium oxide, cobalt oxide, zirconium oxide, titanium oxide and magnesium oxide and; 1 to 100 parts by mass of one selected from, or a mixture or a copolymer of two or more selected from the acrylic resin, the epoxy resin, and the polyester resin.