# US 12,215,399 B2 · Non-oriented electrical steel sheet and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,215,399 B2 - Document ID: US12215399B2 - Status: Granted - Kind: B2 - Application number: 17/440,646 - Filed: 2020-04-17 - Published: 2022-10-06 - Granted: 2025-02-04 - Earliest claimed: 2020-04-17 - Assignees: Nippon Steel Corporation - Applicants: Nippon Steel Corporation - Inventors: Hiroyasu Fujii; Jun Maki; Kazutoshi Takeda; Hiroyuki Mimura; Yusuke Kanto; Shuichi Yamazaki - Web page: https://patentgrep.com/patent/US12215399B2 ## CPC - C21D 8/1283: {Application of a separating or insulating coating} - C23C 22/12: containing zinc cations - B05D 3/0486: {Operating the coating or treatment in a controlled atmosphere} - B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) - C04B 28/344: {the phosphate binder being present in the starting composition solely as one or more phosphates} - C21D 1/26: Methods of annealing - C21D 1/76: Adjusting the composition of the atmosphere - C21D 8/1244: characterised by the heat treatment - C21D 9/46: for sheet metals - C23C 22/74: for obtaining burned-in conversion coatings - H01F 1/18: with insulating coating - B05D 3/0272: {with ovens} - B05D 2202/10: based on Fe - B05D 2401/20: Aqueous dispersion or solution - B05D 2502/00: Acrylic polymers - B05D 2503/00: Polyurethanes - B05D 2504/00: Epoxy polymers - B05D 2601/28: Metals - C04B 2111/00525: {for metallic surfaces} - 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) - 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) - B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02) - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A non-oriented electrical steel sheet according to one embodiment of this invention includes a base metal steel sheet and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet. A molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after the non-oriented electrical steel sheet is boiled for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more. The method for determining the amount of soluble Zn is in accordance with JIS K 0102: 2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”. ## Claims ### Claim 1 A non-oriented electrical steel sheet, comprising: a base metal steel sheet, and a composite coating film composed of a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet, wherein: a molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after boiling the non-oriented electrical steel sheet for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more; where, a method for determining the amount of soluble Zn is in accordance with JIS K 0102:2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”. ### Claim 2 (depends on 1) The non-oriented electrical steel sheet according to claim 1, wherein: the metal components of the composite coating film further include one or more of Al, Mg and Ca. ### Claim 3 (depends on 1) The non-oriented electrical steel sheet according to claim 1, wherein: the organic resin includes one or more of an acrylic resin, a styrene resin, an acrylic-styrene resin, an epoxy resin, a polyester resin, a phenol resin and a urethane resin. ### Claim 4 (depends on 1) A method for producing a non-oriented electrical steel sheet according to claim 1, comprising: a step of applying a coating solution to a surface of a base metal steel sheet, the coating solution containing a Zn-containing phosphate in which a molar ratio of Zn to all metal components is 10 mol % or more and an organic resin, and thereafter, a step of forming the composite coating film on the base metal steel sheet by baking the coating solution under an atmosphere with a dew point of +30° C. or more. ### Claim 5 (depends on 4) The method for producing a non-oriented electrical steel sheet according to claim 4, wherein: the coating solution further contains one or more of Al, Mg and Ca. ### Claim 6 (depends on 4) The method for producing a non-oriented electrical steel sheet according to claim 4, wherein: the organic resin is one or more of an acrylic resin, a styrene resin, an acrylic-styrene resin, an epoxy resin, a polyester resin, a phenol resin and a urethane resin. ### Claim 7 (depends on 4) The method for producing a non-oriented electrical steel sheet according to claim 4, wherein: an end-point temperature when baking the coating solution is within a range of 200 to 450° C. ### Claim 8 A non-oriented electrical steel sheet, comprising: a base metal steel sheet, and a composite coating film comprises a Zn-containing phosphate and an organic resin, the composite coating film being formed on a surface of the base metal steel sheet, wherein: a molar ratio of Zn to all metal components in the composite coating film is 10 mol % or more, and after boiling the non-oriented electrical steel sheet for 20 minutes in boiled distilled water, an amount of soluble Zn in the distilled water is 1.0 mg/m2 or more; where, a method for determining the amount of soluble Zn is in accordance with JIS K 0102:2016 “Testing Methods for Industrial Wastewater”, 53.3 “ICP Emission Spectroscopy”. ### Claim 9 (depends on 8) The non-oriented electrical steel sheet according to claim 8, wherein: the metal components of the composite coating film further include one or more of Al, Mg and Ca. ### Claim 10 (depends on 8) The non-oriented electrical steel sheet according to claim 8, wherein: the organic resin includes one or more of an acrylic resin, a styrene resin, an acrylic-styrene resin, an epoxy resin, a polyester resin, a phenol resin and a urethane resin.