WO2011102328A1 - 無方向性電磁鋼板及びその製造方法 - Google Patents
無方向性電磁鋼板及びその製造方法 Download PDFInfo
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- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1288—Application of a tension-inducing coating
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
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- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
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- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
- C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings
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- 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
- C23C24/00—Coating starting from inorganic powder
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
- C23C8/18—Oxidising of ferrous surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
- H01F1/14783—Fe-Si based alloys in the form of sheets with insulating coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
- H01F1/18—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/32—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying conductive, insulating or magnetic material on a magnetic film, specially adapted for a thin magnetic film
Definitions
- the present invention relates to a non-oriented electrical steel sheet suitable for a motor core material and a manufacturing method thereof.
- non-oriented electrical steel sheets containing Si and Al to increase the specific resistance and increase the crystal grain size, hot rolled sheet annealing and techniques to improve the texture by adjusting the cold rolling rate. Has been done.
- the non-oriented electrical steel sheet is an electrical steel sheet whose crystal orientation is random in the direction parallel to the surface, but depending on the application of the non-oriented electrical steel sheet, the magnetic properties in one direction parallel to the surface, for example, the rolling direction.
- a split core is used as a stator of a motor, it is preferable to use an electromagnetic steel plate as described above for the split core.
- a grain-oriented electrical steel sheet can be considered as an electrical steel sheet having excellent magnetic properties in the rolling direction, punching is difficult because a glass film is present on the surface of the grain-oriented electrical steel sheet.
- the direction of easy magnetization of the electromagnetic steel sheet can be matched with the direction of the flow of magnetic flux, so that the efficiency of the motor can be improved.
- the yield of the electromagnetic steel plate which is a raw material can be improved, and a winding filling rate can be increased.
- An object of the present invention is to provide a non-oriented electrical steel sheet capable of obtaining better magnetic properties in the rolling direction and a method for producing the same.
- Patent Document 4 The inventors pay attention to the technique disclosed in Patent Document 4 and use a tension-imparting type insulating coating as an insulating coating formed on the surface of the non-oriented electrical steel sheet. Various experiments etc. were conducted, thinking that this could be improved. However, it has been found that when a tension-imparting type insulating coating is simply used, the insulating coating cannot sufficiently withstand various processes (punching, caulking, etc.) for forming the split core. That is, the insulating film may be peeled off. Further, although the magnetic properties in the rolling direction are improved, it is not always sufficient.
- the inventors of the present invention conducted intensive studies to investigate these causes, and found that the adhesion between the tension-imparting insulating coating and the ground iron was low, and accompanying this, sufficient tension was applied to the ground iron. Found that is not working. And when the present inventors conducted further intensive studies based on these findings, when a specific oxide layer is present on the surface of the ground iron, this oxide layer is of a tension-providing type with the ground iron. It has been found that the magnetic properties in the rolling direction are remarkably improved by contributing to the improvement of adhesion with the insulating coating. Moreover, it discovered that peeling of an insulating film etc. was suppressed with the improvement of adhesiveness.
- the gist of the present invention is as follows.
- a step of finish annealing the cold-rolled steel strip Forming a tension-imparting type insulating coating of 1 g / m 2 or more and 6 g / m 2 or less on the surface of the cold-rolled steel strip;
- the cold-rolled steel strip is Si, Al and Cr: 2% by mass to 6% by mass in total content, and Mn: 0.1% by mass to 1.5% by mass, Containing C content of the cold-rolled steel strip is 0.005 mass% or less,
- the remainder of the cold-rolled steel strip is made of Fe and inevitable impurities
- the step of performing the final annealing is an atmosphere in which the partial pressure ratio of water vapor to hydrogen is 0.005 ⁇ X 2 or less when the total content of Si and Al in the cold-rolled steel strip is expressed as X (mass%).
- the temperature of the cold-rolled steel strip is 800 ° C. or higher and 1100 ° C. or lower, and the surface of the cold-rolled steel strip contains at least one oxide selected from the group consisting of Si and Al, and has a thickness of 0
- a method for producing a non-oriented electrical steel sheet comprising a step of forming an oxide layer of 0.01 ⁇ m or more and 0.5 ⁇ m or less.
- the step of forming the insulating coating is performed after the step of performing the finish annealing. Applying a coating solution to the surface of the cold-rolled steel strip; Baking the coating liquid at a temperature of the cold-rolled steel strip of 800 ° C. or higher and 1100 ° C. or lower; (5) The manufacturing method of the non-oriented electrical steel sheet according to (5).
- the step of forming the insulating film includes: Applying a coating solution to the surface of the cold-rolled steel strip before the step of performing the finish annealing; A step of baking the coating liquid during the finish annealing; (5) The manufacturing method of the non-oriented electrical steel sheet according to (5).
- FIG. 1A is a view showing a scanning electron microscope cross-sectional photograph of an oxide on the surface of a steel strip that has been subjected to final annealing in an atmosphere with a partial pressure ratio (P H2O / P H2 ) of 0.1.
- FIG. 1B is a view showing a scanning electron microscope cross-sectional photograph of oxide on the surface of a steel strip that has been subjected to final annealing in an atmosphere with a partial pressure ratio (P H2O / P H2 ) of 0.01.
- FIG. 2 is a diagram showing an infrared sensitive reflection spectrum of the external oxide film 102.
- FIG. 1A is a view showing a scanning electron microscope cross-sectional photograph of an oxide on the surface of a steel strip that has been subjected to final annealing in an atmosphere with a partial pressure ratio (P H2O / P H2 ) of 0.01.
- FIG. 2 is a diagram showing an infrared sensitive reflection spectrum of the external oxide film 102.
- FIG. 3 is a diagram showing the relationship between the composition of the cold-rolled steel strip and the atmosphere of finish annealing, and the state of the surface of the base iron.
- FIG. 4 is a cross-sectional view showing the structure of the non-oriented electrical steel sheet according to the embodiment of the present invention.
- FIG. 5 is a flowchart showing an example of a method for producing a non-oriented electrical steel sheet.
- FIG. 6 is a flowchart showing another example of a method for producing a non-oriented electrical steel sheet.
- the iron loss value (W10 / 50) under the excitation condition with a frequency of 50 Hz and a maximum magnetic flux density of 1.0 T is orthogonal to the rolling direction in the rolling direction (L direction) and the surface of the cold-rolled steel strip.
- the direction (C direction) was measured.
- 3 g / m 2 of a coating liquid (coating liquid) composed of aluminum phosphate, colloidal silica, and chromic acid was applied to both surfaces of each steel strip and baked at 800 ° C. That is, a tension applying type insulating coating was formed.
- the iron loss value (W10 / 50) was measured again about the L direction and the C direction.
- FIG. 1A shows a scanning electron microscope cross-sectional photograph of the oxide on the surface of a steel strip that has been annealed in an atmosphere with a partial pressure ratio (P H2O / P H2 ) of 0.1
- FIG. 1B shows the partial pressure ratio (P The scanning electron microscope cross-sectional photograph of the oxide of the surface of the steel strip which performed final annealing in the atmosphere whose H2O / PH2 ) is 0.01 is shown.
- a thick internal oxide layer 103 was present on the surface of the steel strip 101 of the steel strip that was subjected to finish annealing in an atmosphere with a partial pressure ratio (P H2O / P H2 ) of 0.1.
- a thin external oxidation having a thickness of about 50 nm is formed on the surface of the steel strip 101 of the steel strip that has been subjected to finish annealing in an atmosphere with a partial pressure ratio (P H2O / P H2 ) of 0.01.
- a membrane 102 was present. Note that the Au vapor deposition layer 104 existing on the outer oxide film 102 and the inner oxide layer 103 is formed for protecting the outer oxide film 102 and the inner oxide layer 103 in preparing a sample for cross-sectional observation.
- FIG. 2 shows an infrared sensitive reflection spectrum of the external oxide film 102. From the spectrum shown in FIG. 2, it was confirmed that the outer oxide film 102 was mainly made of Al 2 O 3 .
- annealing conditions are important for forming an external oxide film during finish annealing. Therefore, the present inventors investigated the relationship between the composition of the cold-rolled steel strip that is the subject of finish annealing, the atmosphere of finish annealing, and the state of the surface of the ground iron.
- various cold-rolled steel strips having different total contents (X (mass%)) of Si, Al, and Cr were produced, and finish annealing was performed in atmospheres having various partial pressure ratios (P H2O / P H2 ). went.
- the finish annealing temperature was 900 ° C. The result is shown in FIG.
- the white marks in FIG. 3 indicate that the internal oxide layer has been formed, and the black marks indicate that the external oxide film has been formed.
- FIG. 3 shows that the external oxide film has a partial pressure ratio (P H2O / P H2 ) of less than 0.005 ⁇ X 2 with respect to the total content (X (mass%)) of Si, Al, and Cr. It can be seen that can be formed.
- FIG. 4 is a cross-sectional view showing the structure of the non-oriented electrical steel sheet according to the embodiment of the present invention.
- a stress applying type insulating coating 2 of 1 g / m 2 or more and 6 g / m 2 or less is formed on the surface of the ground iron 1.
- an outer oxide film 3 containing at least one oxide selected from the group consisting of Si, Al, and Cr and having a thickness of 0.01 ⁇ m or more and 0.5 ⁇ m or less is formed on the surface of the ground iron 1.
- the base iron 1 includes a base 4 and an external oxide film 3.
- the external oxide film 3 is an example of an oxide layer.
- the base iron 1 contains Si, Al, and Cr: 2% by mass to 6% by mass in total content, and Mn: 0.1% by mass to 1.5% by mass.
- the C content of the base iron 1 is 0.005% by mass or less, and the balance of the base iron 1 is composed of Fe and inevitable impurities.
- FIG. 5 is a flowchart showing an example of a method for producing a non-oriented electrical steel sheet.
- step S1 hot rolling of a slab (steel material) having a predetermined composition heated to a predetermined temperature is performed to produce a hot-rolled steel strip.
- step S2 the scale is removed by pickling and cold rolling of the hot-rolled steel strip is performed to produce a cold-rolled steel strip.
- the cold rolling only one cold rolling may be performed, or two or more cold rollings with intermediate annealing interposed therebetween may be performed. In addition, you may anneal as needed before cold rolling.
- the C content is 0.005% by mass or less.
- Si, Al, and Cr exhibit the effect of increasing the specific resistance of the non-oriented electrical steel sheet and reducing eddy current loss.
- Si, Al, and Cr are used for forming the external oxide film 3 as will be described in detail later.
- the total content of Si, Al, and Cr is 2 mass% or more.
- the total content of Si, Al and Cr is more than 6% by mass, cold working such as cold rolling becomes difficult. Therefore, the total content of Si, Al, and Cr is 6% by mass or less.
- Mn exhibits the effect of reducing the solute S during slab heating. However, if the Mn content is less than 0.1% by mass, this effect cannot be sufficiently obtained. Therefore, the Mn content is 0.1% by mass or more. On the other hand, if the Mn content is more than 1.5% by mass, the magnetic properties are deteriorated. Therefore, the Mn content is 1.5% by mass or less.
- unavoidable impurities such as Ti, V, Zr, and Nb that may form nonmagnetic inclusions by combining with S, N, and O are minimized.
- rare earth elements, Ca, etc. may be contained in order to scavenge S, N, and O. Preferable contents of rare earth elements and Ca are 0.002 mass% or more and 0.01 mass% or less.
- Sn and Sb have an effect of improving the L-direction characteristics by improving the texture, and can be added to expect a synergistic effect with the effect of the present invention.
- step S3 finish annealing of the cold-rolled steel strip is performed in a predetermined atmosphere, and the base iron 1 having the outer oxide film 3 formed on the surface is produced (step S3).
- the temperature of the cold-rolled steel strip is set to 800 ° C. or more and 1100 ° C. or less. If the temperature is lower than 800 ° C., it is difficult to sufficiently form the external oxide film 3. On the other hand, when the temperature is higher than 1100 ° C., the cost increases remarkably and stable operation becomes difficult.
- the partial pressure ratio (P H2O / P H2 ) of water vapor to hydrogen is 0 with respect to the total content (X (mass%)) of Si, Al, and Cr. and less than .005 ⁇ X 2. If this condition is satisfied, a desired external oxide film can be formed as the oxide layer 3 as described above.
- This external oxide film 3 contributes to a significant improvement in the adhesion between the tension applying type insulating coating 2 and the ground iron 1. And tension
- the thickness of the external oxide film 3 is desirably 0.01 ⁇ m or more. In addition, it is difficult to obtain sufficient adhesion even when the thickness of the external oxide film 3 exceeds 0.5 ⁇ m. This is presumably because unnecessary stress is generated on the surface of the base 4 of the ground iron 1 by forming the outer oxide film 3 thick. Therefore, the thickness of the external oxide film 3 is desirably 0.5 ⁇ m or less.
- the thickness of the external oxide film 3 can be controlled, for example, by adjusting the temperature of the final annealing and the soaking time. That is, the higher the soaking temperature and the longer the soaking time, the thicker the outer oxide film 3 is formed.
- the material constituting the external oxide film 3 is determined according to the respective contents of Si, Al, and Cr, and the main components of the external oxide film 3 are, for example, SiO 2 , Al 2 O 3 , Cr 2 O 3, etc. is there.
- SiO 2 is mainly external oxide film 3
- the total content of Al and Cr is 0.8 mass% or more
- Al 2 O 3, Cr 2 O 3 or (Al, Cr) 2 O 3 is the main component of the external oxide film 3.
- the main constituent of the external oxide film 3 is not particularly limited, but particularly high adhesion can be obtained when the main component is Al 2 O 3 , Cr 2 O 3 or (Al, Cr) 2 O 3 .
- the total content of Al and Cr is preferably 0.8% by mass or more.
- the external oxide film 3 is not composed only of these main components, and even when Al and Cr are small, Al 2 O 3 and Cr 2 O 3 and the like may be contained. Even when the content is more than 0.8% by mass, SiO 2 may be contained.
- the tension-imparting type insulating coating 2 is formed on the surface of the base iron 1 (step S4).
- a predetermined coating solution is applied and baked.
- the coating solution it is possible to use a coating solution used for grain-oriented electrical steel sheets.
- a coating solution mainly composed of phosphate and colloidal silica can be used.
- the proportion of phosphate and colloidal silica is not particularly limited, but the proportion of colloidal silica is preferably 4% by mass to 24% by mass, and the proportion of phosphate is preferably 5% by mass to 30% by mass.
- Such coating solutions are described, for example, in JP-A-48-39338 and JP-A-50-79442.
- a coating solution mainly composed of boric acid and alumina sol can be used.
- the component ratio of aluminum and boron is not particularly limited, but aluminum oxide is preferably 50% by mass to 95% by mass in terms of each oxide.
- Such coating liquids are described in, for example, Japanese Patent Application Laid-Open Nos. 6-65754 and 6-65555.
- the amount of the tension-imparting insulating coating 2 formed is 1 g / m 2 or more and 6 g / m 2 or less per side. If the formation amount of the insulating coating 2 is less than 1 g / m 2 , the tension is not sufficiently applied, and it is difficult to sufficiently improve the magnetic properties in the rolling direction (L direction). On the other hand, when the formation amount of the insulating coating 2 exceeds 6 g / m 2 , the space factor decreases.
- the baking temperature is preferably 800 ° C. or higher and 1100 ° C. or lower.
- the baking temperature is less than 800 ° C., the tension is not sufficiently applied, and it is difficult to sufficiently improve the magnetic properties in the rolling direction (L direction).
- the baking temperature is higher than 1100 ° C., the cost increases remarkably and stable operation becomes difficult.
- the non-oriented electrical steel sheet according to the embodiment can be manufactured by such a series of processes.
- the outer oxide film 3 firmly adheres the ground iron 1 and the tension-imparting insulating coating 2 to each other. For this reason, even when a higher tension is applied to further improve the magnetic properties in the rolling direction (L direction) and various processes (such as punching and caulking) for forming the split core are performed, the insulating coating 2 Can be prevented.
- step S4 application
- a coating made of only a resin on the tension-applying insulating coating 2 and / or You may form the film comprised from an inorganic substance and resin. That is, the punching property can be further improved by applying and baking the coating liquid usually used for forming the insulating coating of the non-oriented electrical steel sheet.
- a coating solution containing chromate and an acrylic resin can be used.
- a coating solution in which a metal oxide, a metal hydroxide, and a metal carbonate are dissolved in a chromic acid aqueous solution and an emulsion type resin is further added can be used.
- a coating solution is described in, for example, Japanese Patent Publication No. 50-15013.
- the coating liquid containing a phosphate and an acrylic resin can also be used.
- a coating solution in which 1 part by mass to 300 parts by mass of an organic resin emulsion is added to 100 parts by mass of phosphate can be used.
- Such a coating solution is described, for example, in JP-A-6-330338.
- the coating liquid was applied and baked under the conditions shown in Table 3 to form a tension-imparting type insulating coating.
- “S” in the column “Coating solution” in Table 3 indicates that a coating solution containing colloidal silica, aluminum phosphate and chromic acid was used, and “A” used a coating solution containing boric acid and alumina sol. It shows that there was.
- the iron loss improvement rate in the L direction was also evaluated.
- the iron loss value W 1 (W10 / 50) of the non-oriented electrical steel sheet manufactured by the above method was measured and compared with the iron loss value W 0 (W10 / 50) of the reference sample.
- the reference sample instead of the tension-applying type insulating film, a film in which an insulating film was formed by applying and baking a coating solution containing a phosphate and an acrylic resin described in JP-A-6-330338 was used. .
- Such an evaluation was performed because the absolute value of the iron loss depends on the components and the process conditions.
- the results are also shown in Table 3.
- the numerical value in the column of “I-direction iron loss improvement rate” in Table 3 is a value represented by “(W 0 ⁇ W 1 ) / W 0 ”.
- the coating solution was applied under the conditions shown in Table 4.
- finish annealing was performed under the conditions shown in Table 4 which also served to bake the coating solution. That is, in the first experiment, processing according to the flowchart shown in FIG. 5 was performed, whereas in the second experiment, processing according to the flowchart shown in FIG. 6 was performed. Then, as in the first experiment, the adhesion of the insulating coating and the iron loss improvement rate in the L direction were evaluated. The results are also shown in Table 4.
- the present invention can be used, for example, in the electrical steel sheet manufacturing industry and the electrical steel sheet utilizing industry.
Abstract
Description
前記地鉄の表面上に形成された1g/m2以上6g/m2以下の応力付与型の絶縁被膜と、
を有し、
前記地鉄は、
Si、Al及びCr:総含有量で2質量%以上6質量%以下、及び
Mn:0.1質量%以上1.5質量%以下、
を含有し、
前記地鉄のCの含有量が0.005質量%以下であり、
前記地鉄の残部がFe及び不可避的不純物からなり、
前記地鉄の表面に、Si、Al及びCrからなる群から選択された少なくとも一種の酸化物を含有し、厚さが0.01μm以上0.5μm以下の酸化物層が形成されていることを特徴とする無方向性電磁鋼板。
前記冷延鋼帯の表面に1g/m2以上6g/m2以下の張力付与型の絶縁被膜を形成する工程と、
を有し、
前記冷延鋼帯は、
Si、Al及びCr:総含有量で2質量%以上6質量%以下、及び
Mn:0.1質量%以上1.5質量%以下、
を含有し、
前記冷延鋼帯のCの含有量が0.005質量%以下であり、
前記冷延鋼帯の残部がFe及び不可避的不純物からなり、
前記仕上げ焼鈍を行う工程は、前記冷延鋼帯のSi及びAlの総含有量をX(質量%)と表したときに、水素に対する水蒸気の分圧比が0.005×X2以下となる雰囲気中で前記冷延鋼帯の温度を800℃以上1100℃以下として、前記冷延鋼帯の表面に、Si及びAlからなる群から選択された少なくとも一種の酸化物を含有し、厚さが0.01μm以上0.5μm以下の酸化物層を形成する工程を有することを特徴とする無方向性電磁鋼板の製造方法。
前記冷延鋼帯の表面に塗布液を塗布する工程と、
前記冷延鋼帯の温度を800℃以上1100℃以下として前記塗布液の焼き付けを行う工程と、
を有することを特徴とする(5)に記載の無方向性電磁鋼板の製造方法。
前記仕上げ焼鈍を行う工程の前に前記冷延鋼帯の表面に塗布液を塗布する工程と、
前記仕上げ焼鈍の際に前記塗布液の焼き付けを行う工程と、
を有することを特徴とする(5)に記載の無方向性電磁鋼板の製造方法。
先ず、表2に示す種々の成分を含有し、残部がFe及び不可避的不純物の鋼スラブ(鋼No.1~No.7)を熱間圧延して厚さが2.5mmの熱延鋼帯を作製した。次いで、900℃で1分間の熱延鋼帯の焼鈍(熱延板焼鈍)を行った。その後、酸洗し、冷間圧延を行って厚さが0.35mmの冷延鋼帯を作製した。
表2に示す鋼No.1、No.3及びNo.4の鋼スラブを熱間圧延して厚さが2.5mmの熱延鋼帯を作製した。次いで、900℃で1分間の熱延鋼帯の焼鈍(熱延板焼鈍)を行った。その後、酸洗し、冷間圧延を行って厚さが0.35mmの冷延鋼帯を作製した。
Claims (20)
- 地鉄と、
前記地鉄の表面上に形成された1g/m2以上6g/m2以下の応力付与型の絶縁被膜と、
を有し、
前記地鉄は、
Si、Al及びCr:総含有量で2質量%以上6質量%以下、及び
Mn:0.1質量%以上1.5質量%以下、
を含有し、
前記地鉄のCの含有量が0.005質量%以下であり、
前記地鉄の残部がFe及び不可避的不純物からなり、
前記地鉄の表面に、Si、Al及びCrからなる群から選択された少なくとも一種の酸化物を含有し、厚さが0.01μm以上0.5μm以下の酸化物層が形成されていることを特徴とする無方向性電磁鋼板。 - 前記地鉄のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項1に記載の無方向性電磁鋼板。
- 前記絶縁被膜が、リン酸塩及びコロイダルシリカを含む塗布液の焼き付けにより形成されていることを特徴とする請求項1に記載の無方向性電磁鋼板。
- 前記絶縁被膜が、ほう酸及びアルミナゾルを含む塗布液の焼き付けにより形成されていることを特徴とする請求項1に記載の無方向性電磁鋼板。
- 前記絶縁被膜が、リン酸塩及びコロイダルシリカを含む塗布液の焼き付けにより形成されていることを特徴とする請求項2に記載の無方向性電磁鋼板。
- 前記絶縁被膜が、ほう酸及びアルミナゾルを含む塗布液の焼き付けにより形成されていることを特徴とする請求項2に記載の無方向性電磁鋼板。
- 冷延鋼帯の仕上げ焼鈍を行う工程と、
前記冷延鋼帯の表面に1g/m2以上6g/m2以下の張力付与型の絶縁被膜を形成する工程と、
を有し、
前記冷延鋼帯は、
Si、Al及びCr:総含有量で2質量%以上6質量%以下、及び
Mn:0.1質量%以上1.5質量%以下、
を含有し、
前記冷延鋼帯のCの含有量が0.005質量%以下であり、
前記冷延鋼帯の残部がFe及び不可避的不純物からなり、
前記仕上げ焼鈍を行う工程は、前記冷延鋼帯のSi及びAlの総含有量をX(質量%)と表したときに、水素に対する水蒸気の分圧比が0.005×X2以下となる雰囲気中で前記冷延鋼帯の温度を800℃以上1100℃以下として、前記冷延鋼帯の表面に、Si及びAlからなる群から選択された少なくとも一種の酸化物を含有し、厚さが0.01μm以上0.5μm以下の酸化物層を形成する工程を有することを特徴とする無方向性電磁鋼板の製造方法。 - 前記絶縁被膜を形成する工程は、前記仕上げ焼鈍を行う工程の後に、
前記冷延鋼帯の表面に塗布液を塗布する工程と、
前記冷延鋼帯の温度を800℃以上1100℃以下として前記塗布液の焼き付けを行う工程と、
を有することを特徴とする請求項7に記載の無方向性電磁鋼板の製造方法。 - 前記塗布液は、リン酸塩及びコロイダルシリカを含むことを特徴とする請求項8に記載の無方向性電磁鋼板の製造方法。
- 前記塗布液は、ほう酸及びアルミナゾルを含むことを特徴とする請求項8に記載の無方向性電磁鋼板の製造方法。
- 前記絶縁被膜を形成する工程は、
前記仕上げ焼鈍を行う工程の前に前記冷延鋼帯の表面に塗布液を塗布する工程と、
前記仕上げ焼鈍の際に前記塗布液の焼き付けを行う工程と、
を有することを特徴とする請求項7に記載の無方向性電磁鋼板の製造方法。 - 前記塗布液は、リン酸塩及びコロイダルシリカを含むことを特徴とする請求項11に記載の無方向性電磁鋼板の製造方法。
- 前記塗布液は、ほう酸及びアルミナゾルを含むことを特徴とする請求項11に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項7に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項8に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項9に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項10に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項11に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項12に記載の無方向性電磁鋼板の製造方法。
- 前記冷延鋼帯のAl及びCrの総含有量が0.8質量%以上であることを特徴とする請求項13に記載の無方向性電磁鋼板の製造方法。
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JP2022509865A (ja) * | 2018-11-30 | 2022-01-24 | ポスコ | 電磁鋼板およびその製造方法 |
JP7329049B2 (ja) | 2018-11-30 | 2023-08-17 | ポスコ カンパニー リミテッド | 電磁鋼板およびその製造方法 |
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Publication number | Publication date |
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CN102782185A (zh) | 2012-11-14 |
EP2537958A4 (en) | 2015-04-29 |
TWI403614B (zh) | 2013-08-01 |
JP5073853B2 (ja) | 2012-11-14 |
US20160035469A1 (en) | 2016-02-04 |
KR101263139B1 (ko) | 2013-05-15 |
CN102782185B (zh) | 2014-05-28 |
US20120305140A1 (en) | 2012-12-06 |
JPWO2011102328A1 (ja) | 2013-06-17 |
US9187830B2 (en) | 2015-11-17 |
EP2537958A1 (en) | 2012-12-26 |
KR20120105051A (ko) | 2012-09-24 |
EP2537958B1 (en) | 2016-08-31 |
BR112012020219A2 (pt) | 2017-01-24 |
BR112012020219B1 (pt) | 2020-12-01 |
TW201204872A (en) | 2012-02-01 |
US9934894B2 (en) | 2018-04-03 |
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