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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
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
  • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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  • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
  • C21D8/0226—Hot rolling
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  • C21D8/0236—Cold rolling
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
  • C21D8/0247—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
  • C21D8/0273—Final recrystallisation annealing
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1205—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving particular fabrication steps or treatments of ingots or slabs
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
  • C21D8/1233—Cold rolling
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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  • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
  • C21D8/1261—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment following hot rolling
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  • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
  • C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
  • C21D8/1272—Final recrystallisation annealing
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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  • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
• • C—CHEMISTRY; METALLURGY
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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• • C—CHEMISTRY; METALLURGY
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  • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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  • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
• • 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
• • 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
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/20—Recycling

Definitions

• the present invention relates to a non-oriented electrical steel sheet and its manufacturing method.
• This application claims priority based on Japanese Patent Application No. 2021-61872 filed in Japan on March 31, 2021, the content of which is incorporated herein.
• Patent Document 1 discloses a non-oriented electrical steel sheet with lower core loss that solves the problem of nitriding that occurs in steel sheets in which sulfides are rendered harmless and grain growth is improved.
• the use of the motor for applications such as the drive motor of a hybrid vehicle must be performed in an environment with stress changes caused by changes in rotation speed due to acceleration/deceleration, vehicle body vibration, magnet vibration in the magnet insertion hole, etc. be used. Therefore, in addition to high strength that can be applied to high-speed rotation and stress concentration areas, it is also required to have high fatigue properties under repeated stress, that is, high fatigue strength.
• An object of the present invention is to provide a non-oriented electrical steel sheet having a tensile strength of 580 MPa or more and excellent fatigue strength.
• the inventors have extensively studied the fatigue strength of non-oriented electrical steel sheets. As a result, it was found that in an electrical steel sheet with low fatigue strength, soft MnS deforms and becomes a starting point for cracks. In addition, it was found that the amount of MnS in inclusions is relatively small in an electrical steel sheet with high fatigue strength.
• the present invention was further studied based on the above findings, and the gist thereof is as follows.
• a non-oriented electrical steel sheet has a chemical composition of, in mass%, Si: 2.5 to 4.5%, sol. Al: 0-2.0%, Mn: 0.1-3.5%, C: 0-0.0030%, P: 0-0.10%, S: 0-0.0030%, N: 0 ⁇ 0.050%, O: 0-0.050%, Mg: 0.0003-0.0050%, Ti: 0-0.0030%, V: 0-0.10%, Sb: 0-0.
• Nd 0-0.10%
• Bi 0-0.10%
• W 0-0.10%
• Nb 0-0.10%
• Y 0-0.10%
• Ni 0-0.5%
• Cr 0-0.5%
• Cu 0-0.5%
• Sn 0-0.2%
• La 0-0.0050%
• Ce 0 containing one or more selected from the group consisting of up to 0.0050%, the balance being Fe and impurities, having a tensile strength of 580 MPa or more, and having an average crystal grain size of 50 ⁇ m or less in the recrystallized portion of the base iron and, in inclusions contained in the base iron having an equivalent circle diameter of 1 ⁇ m or more and an S content of 5% by mass or more, the Mg content is 5% by mass or less and the Mn content is 5% by mass or more.
• the number of inclusions having a Mg content of more than 5% by mass and a Mn content of 5% by mass or more is five times or more the number of certain inclusions.
• the number density of inclusions having an equivalent circle diameter of 5 ⁇ m or more may be less than 1.0/mm 2 .
• the non-oriented electrical steel sheet described in (1) above may have a thickness of less than 0.30 mm.
• a method for manufacturing a non-oriented electrical steel sheet according to another aspect of the present invention is a method for manufacturing a non-oriented electrical steel sheet according to (1) above, which comprises a step of manufacturing a steel slab by casting; a step of heating the steel slab, a step of hot-rolling the heated steel slab to form a hot-rolled steel plate, a winding step of winding the hot-rolled steel plate, and a cold-rolling step of cold-rolling the hot-rolled steel plate into a cold-rolled steel plate. and a step of finish annealing the cold-rolled steel sheet to obtain a non-oriented electrical steel sheet, wherein in the casting, the cooling rate from 1300 ° C. to 1200 ° C.
• the temperature is set to 700 to 900°C.
• a non-oriented electrical steel sheet having a tensile strength of 580 MPa or more and excellent fatigue strength can be obtained.
• the fatigue strength is improved by making the sulfides in the inclusions in the base iron more hardened inclusions containing Mg.
• more hardened inclusions containing Mg are defined as follows.
• inclusions having an equivalent circle diameter of 1 ⁇ m or more and inclusions having an S content of 5% by mass or more inclusions having a Mg content of 5% by mass or less and an Mn content of 5% by mass or more”.
• the number of "inclusions having a Mg content of more than 5% by mass and a Mn content of 5% by mass or more” is set to be at least five times as large as the number of .
• inclusions harden, deformation of inclusions reduces the occurrence of crack initiation, and fatigue strength is improved.
• an inclusion having a Mg content of 5% by mass or less and an Mn content of 5% by mass or more is preferably 10 times or more the number of the inclusions.
• the observation surface may be prepared by oblique polishing, or may be prepared by laminating a plurality of steel plates.
• a steel plate is cut out and embedded in a resin such that a plane including the width direction (the direction perpendicular to the rolling direction) and the plate thickness direction serves as an observation surface.
• the observation surface of the resin-filled steel plate is polished.
• the area to be observed may be changed according to the number of inclusions present, but should be 5 mm 2 or more.
• the size of the inclusion is determined by measuring the size of the inclusion using image analysis software and defining it by the diameter when converted to a circle.
• the inclusions can be subjected to elemental analysis using EDS, and the composition is defined by the average value of the entire mass of individual inclusions.
• EDS analysis elemental concentration analysis
• All detected elements are quantified, and inclusions having an equivalent circle diameter of 1.0 ⁇ m or more, a Mg content of 5% by mass or less and a Mn content of 5% by mass or more, Inclusions having an equivalent circle diameter of 1.0 ⁇ m or more, a Mg content of more than 5% by mass, and a Mn content of 5% by mass or more are specified.
• the equivalent circle diameter is 1.0 ⁇ m or more
• the S content is 5% by mass or more
• the Mn content is 5% by mass or more.
• the number of inclusions with a Mg content of 5% by mass or less and the number of inclusions with a Mg content of more than 5% by mass are obtained, and the ratio thereof is calculated.
• the number density (number/mm 2 ) based on the total area of the observed field of view, round the obtained value to the third decimal place.
• the number density is measured using a scanning electron microscope equipped with a composition analysis function (SEM-EDS apparatus).
• the inclusions may act as starting points for cracks, lowering the fatigue limit. Therefore, it is preferable that there are few coarse inclusions.
• the number density of inclusions having an equivalent circle diameter of 5 ⁇ m or more is preferably less than 1.0/mm 2 .
• the method for making the number density of inclusions having an equivalent circle diameter of 5 ⁇ m or more less than 1.0/mm 2 is not particularly limited.
• an electromagnetic brake is applied to the molten steel in the mold to prolong the time the molten steel stays in the mold to float inclusions on the surface of the molten steel, or
• a mold is used to prolong the residence time of the molten steel in the mold so that inclusions float to the surface of the molten steel, and then the floated inclusions are removed.
• realizing inclusions containing Mg defined in the present invention also contributes to making the number density of inclusions having an equivalent circle diameter of 5 ⁇ m or more less than 1.0 pieces/mm 2 .
• Coarse inclusions having an equivalent circle diameter of 5 ⁇ m or more include, for example, Al 2 O 3 and MnS. Between Al and Mg, Mg has a higher deoxidizing power than Al. Therefore, in the present invention that utilizes Mg, MgO is likely to be generated by secondarily reducing Al 2 O 3 in the steelmaking stage. If Al 2 O 3 remains as it is, it has a large specific gravity and tends to remain in molten steel, but MgO has a small specific gravity and easily floats, so it is easy to remove.
• Mg is more likely than Mn to form sulfides, and more likely to start precipitation at a higher temperature than MnS. Therefore, the amount of precipitation of MnS can be reduced. Furthermore, MgS, which is uniformly dispersed first, becomes a precipitation site for MnS that precipitates later, thereby suppressing the formation frequency of coarse MnS that is formed by itself. Therefore, formation of coarse inclusions can be suppressed by controlling Mg inclusions.
• the microstructure has almost 100% ferrite.
• the remainder of the microstructure is inclusions and the like.
• the average crystal grain size of the recrystallized portion is 50 ⁇ m or less.
• the recrystallized portion refers to a crystal grain (recrystallized grain) having an aspect ratio (length in the rolling direction/length in the sheet thickness direction) of 3 or less among ferrite grains.
• non-recrystallized grains have an aspect ratio of more than 3.
• a test piece having observation planes including the rolling direction and thickness direction of the steel sheet is prepared, and the central portion of the thickness is observed. After polishing the observation surface of the test piece to a mirror surface, it is immersed in a 3% nital corrosive solution for 10 seconds to expose the structure by etching. The etched observation surface is observed with an optical microscope at a magnification of 500 times. Crystal grains having an aspect ratio of 3 or less are specified from the observation surface after etching, and the average grain size is calculated from them. The average grain size shall be obtained according to JIS G 0551:2013 "Steel - Microscopic test method for grain size".
• the lower limit of the average crystal grain size of the recrystallized portion does not need to be particularly limited, but if the crystal grains are excessively refined and the average crystal grain size becomes too small, the plate shape of the steel sheet may deteriorate. Therefore, the average grain size of the recrystallized portion is preferably 10 ⁇ m or more, more preferably 12 ⁇ m or more, and even more preferably 15 ⁇ m or more. Also, the ratio of non-recrystallized grains may be 100%. If no recrystallized grains are observed, the average grain size defined in the present invention shall be zero.
• the non-oriented electrical steel sheet according to this embodiment has a tensile strength of 580 MPa or more. Since the chemical composition for increasing the tensile strength is known, it may be adjusted as appropriate.
• the chemical composition of the non-oriented electrical steel sheet according to this embodiment can be, for example, the chemical composition described later. Further, in order to obtain a tensile strength of 580 MPa or more, it is necessary to adjust the finish annealing temperature as described later. Tensile strength is measured using JIS Z2241:2011 No. 13B tensile test piece.
• the chemical composition of the non-oriented electrical steel sheet according to this embodiment is not particularly limited as long as it can be applied to non-oriented electrical steel sheets with a tensile strength of 580 MPa or more.
• An example of a suitable chemical composition of the non-oriented electrical steel sheet according to this embodiment is shown below. "%" in the chemical composition description shall mean "% by mass”.
• the non-oriented electrical steel sheet according to the present embodiment has a chemical composition of Si: 2.5 to 4.5%, sol.
• Si is an element that increases the strength of the steel sheet. Moreover, Si is an element that increases the resistivity, and is included to reduce iron loss. From the viewpoint of this effect and prevention of reduction in saturation magnetic flux density and embrittlement of steel, the Si content is preferably 2.5 to 4.5%. The Si content is preferably 2.8% or more, more preferably 3.0% or more. Also, the Si content is more preferably 4.2% or less, and still more preferably 4.0% or less.
• sol. Al like Si, is an element that increases the resistivity and is contained to reduce iron loss. Since the effect of iron loss reduction can be obtained even with Si, sol. Al may not be contained. Therefore, sol. Al content may be 0%. sol. The Al content may be 0.3% or more, 0.4% or more, 0.5% or more, or 0.6% or more. On the other hand, from the viewpoint of preventing a decrease in saturation magnetic flux density, sol. The Al content is preferably 2.0% or less. sol. The Al content is more preferably 1.8% or less, still more preferably 1.5% or less. sol. The Al content may be 1.2% or less.
• sol. Al means acid-soluble Al that is not an oxide such as Al 2 O 3 and is soluble in acid, and was measured by excluding undissolved residue on the filter paper generated in the process of analyzing Al. It is calculated as Al.
• Mn is Si, sol. Since it has the effect of increasing the specific resistance like Al, it is contained in order to reduce iron loss. Mn is also an element that increases the strength of the steel sheet. From the viewpoint of this effect and prevention of reduction in saturation magnetic flux density and embrittlement of steel, the Mn content is preferably 0.1 to 3.5%. The Mn content is more preferably 0.4% or more, still more preferably 0.6% or more, and even more preferably 0.8% or more. The Mn content may be 0.9% or more, 1.0% or more, or 1.2% or more. Also, the Mn content is more preferably 3.3% or less, and still more preferably 3.5% or less. The Mn content may be 3.0% or less.
• the C content is contained as an impurity.
• the C content is preferably 0.0030% or less.
• the C content is more preferably 0.0025% or less, still more preferably 0.0020% or less.
• the lower limit of the C content is not particularly limited and may be 0%, but the C content may be 0.0010% or more from the viewpoint of manufacturing costs.
• the P content may be 0%.
• the P content may be 0.01% or more, 0.02% or more, or 0.04% or more.
• the P content is preferably 0.10% or less.
• the P content is more preferably 0.08% or less, still more preferably 0.06% or less.
• the P content may be 0.04% or less.
• the S content is contained as an impurity.
• the S content is preferably 0.0030% or less.
• the S content is more preferably 0.0025% or less, still more preferably 0.0020% or less.
• the S content of the steel sheet is more than 0% in order to form inclusions having an S content of 5% by mass or more.
• the S content may be 0.0006% or more and 0.0007% or more.
• the N content is contained as an impurity.
• the N content is preferably 0.050% or less. If the N content is 0.050% or less, the generation of excessive inclusions and precipitates is suppressed, and the deterioration of magnetic properties and fatigue strength can be further suppressed.
• the N content may be 0.0027% or less, 0.0025% or less, or 0.0020% or less. Also, since N does not have to be contained in the non-oriented electrical steel sheet, the lower limit of the N content may be 0%, but in order to suppress excessive cost increase, the N content is 0.0010 % or more.
• the N content may be 0.0014% or more, 0.0017% or more, or 0.0020% or more.
• the O content is contained as an impurity.
• the O content is preferably 0.050% or less. If the O content is 0.050% or less, the formation of excessive inclusions and precipitates is suppressed, and deterioration of magnetic properties and fatigue strength can be further suppressed.
• the O content may be 0.0027% or less, 0.0025% or less, or 0.0020% or less.
• the lower limit of the O content may be 0%, but in order to suppress excessive cost increase, the O content is 0.0010 % or more.
• the O content may be 0.0014% or more, 0.0017% or more, or 0.0020% or more.
• Mg is an element that reduces iron loss through the action of promoting the growth of crystal grains, and is an element that improves fatigue strength by turning sulfides in inclusions into harder inclusions containing Mg.
• the Mg content is preferably 0.0003 to 0.0050% in consideration of cost.
• the Mg content is more preferably 0.0005% or more, still more preferably 0.0010% or more.
• the Mg content is more preferably 0.0040% or less, still more preferably 0.0030% or less.
• Ti is an element contained as an impurity. Ti combines with C, N, O, etc. in the base iron to form fine precipitates such as TiN, TiC, Ti oxides, etc., which hinder the growth of crystal grains during annealing and deteriorate the magnetic properties. Therefore, the Ti content is preferably 0.0030% or less. The Ti content is more preferably 0.0020% or less, still more preferably 0.0010% or less. Since Ti need not be contained, the lower limit of the content is 0%. Considering the refining cost, the Ti content may be 0.0003% or more or 0.0005% or more.
• the rest of the chemical composition is Fe and impurities.
• impurity means a component contained in the raw material or a component mixed in during the manufacturing process and not intentionally included in the steel sheet. Impurities include, for example, Zn and B.
• the non-oriented electrical steel sheet according to the present embodiment has V: 0 to 0.10%, Zr: 0 to 0.10%, Sb: 0 to 0.10%, Nd: 0 to 0.10%, May contain Bi: 0-0.10%, W: 0-0.10%, Nb: 0-0.10%, Y: 0-0.10%, Ca: 0-0.0050% .
• V and Nb are elements that contribute to increasing the strength of the non-oriented electrical steel sheet. Since V and Nb may not be contained, each content of V and Nb may be 0%, but in order to obtain the above effect, each content of V and Nb is 0.0010% or more. is preferably Each content of V and Nb may be 0.0023% or more. On the other hand, if each element of V and N is contained excessively, fine precipitates impede grain growth and lead to inferior iron loss. preferable. Each content of V and Nb is preferably 0.0050% or less.
• Zr, Nd, Bi, W, and Y are elements that reduce fine precipitates and improve the grain growth of crystal grains. As a result, productivity is improved. Since the above elements may not be contained, the contents of each of Zr, Nd, Bi, W, and Y may be 0%. and Y is preferably 0.0010% or more. Each content of Zr, Nd, Bi, W and Y is more preferably 0.0015% or more. On the other hand, even if each element of Zr, Nd, Bi, W, and Y is contained excessively, the above effect is saturated, so each content of Zr, Nd, Bi, W, and Y is 0.10% The following are preferable. Each content of Zr, Nd, Bi, W and Y is preferably 0.0010% or less.
• Sb is an element that improves magnetic properties such as B50. Since Sb does not have to be contained, the Sb content may be 0%, but in order to obtain the above effect, the Sb content is preferably 0.0050% or more. The Sb content is more preferably 0.01% or more. On the other hand, even if Sb is contained excessively, the above effect is saturated, so the Sb content is preferably 0.10% or less. The Sb content is preferably 0.05% or less.
• the steel sheet may contain one or more elements selected from the group consisting of Ni, Cr, Cu, Sn, La, and Ce, instead of part of Fe.
• Ni is an element that increases the electrical resistance of steel sheets and reduces iron loss. Ni does not need to be contained, and the lower limit of Ni content is 0%. Although the effect of containing Ni can be obtained even if the amount is very small, in order to reliably obtain the effect of containing Ni, the Ni content is preferably 0.01% or more, more preferably 0.02% or more. preferable. From the viewpoint of product cost, the Ni content is preferably 0.5% or less, more preferably 0.4% or less.
• Cr is an element that improves corrosion resistance and high-frequency characteristics. Cr does not need to be contained, and the lower limit of Cr content is 0%. Although the effect of containing Cr can be obtained even with a very small amount, in order to obtain the effect of containing reliably, the Cr content is preferably 0.01% or more, more preferably 0.02% or more. preferable. From the viewpoint of product cost, the Cr content is preferably 0.5% or less, more preferably 0.4% or less.
• Cu is an element that increases the electrical resistance of steel sheets and reduces iron loss.
• Cu need not be contained, and the lower limit of Cu content is 0%.
• the Cu content is preferably 0.01% or more, more preferably 0.02% or more. preferable. From the viewpoint of product cost and prevention of steel embrittlement, the Cu content is preferably 0.5% or less, more preferably 0.4% or less.
• Sn is an element that develops a preferred crystal orientation for magnetic properties. Sn does not have to be contained, and the lower limit of Sn content is 0%. Although the effect of containing Sn can be obtained even in a very small amount, the content is preferably 0.01% or more, more preferably 0.02% or more, in order to reliably obtain the effect of containing Sn. . From the viewpoint of preventing deterioration of magnetic properties, the Sn content is preferably 0.2% or less, more preferably 0.1% or less.
• La is an element that coarsens sulfides, improves the growth of crystal grains in the heat treatment process, and contributes to low iron loss.
• La does not need to be contained, and the lower limit of the La content is 0%.
• the La content is preferably 0.005% or more, more preferably 0.0010% or more. preferable. From the viewpoint of preventing deterioration of magnetic properties, the La content is preferably 0.0050% or less, more preferably 0.0030% or less.
• Ce is an element that coarsens sulfides, improves the growth of crystal grains in the heat treatment process, and contributes to low iron loss. Ce does not need to be contained, and the lower limit of Cu content is 0%. Although the effect of containing Ce can be obtained even in a very small amount, the Ce content is preferably 0.005% or more, more preferably 0.0010% or more, in order to reliably obtain the effect of containing Ce. preferable. From the viewpoint of preventing deterioration of magnetic properties, the Ce content is preferably 0.0050% or less, more preferably 0.0030% or less.
• one or more elements selected from the group consisting of As, Ga, Ge, Se, Co, and Pb are contained in the range of 0 to 0.01%, respectively.
• the thickness of the non-oriented electrical steel sheet according to this embodiment is preferably less than 0.30 mm. If the plate thickness is less than 0.30 mm, deterioration in magnetic properties is suppressed.
• a steel slab with a predetermined chemical composition is manufactured.
• a slab is first melted in a converter, an electric furnace, or the like, and further subjected to vacuum degassing as necessary to obtain molten steel.
• the obtained molten steel is continuously cast or bloomed after ingot making to form a slab having a thickness of about 30 to 400 mm.
• the cooling rate from 1300° C. to 1200° C. is set to 50° C./s or less. If the cooling rate is too fast, MgS is not produced preferentially over MnS, and the number of inclusions having a Mg content of more than 5% by mass and a Mn content of 5% by mass or more is reduced.
• the fatigue strength of the grain-oriented electrical steel sheet is lowered.
• the thickness of the steel slab may be 150 mm or more. Also, the thickness of the steel slab may be 350 mm or less.
• the steel slab After manufacturing the steel slab, the steel slab is reheated and hot-rolled to form a hot-rolled steel sheet. At this time, in the heating of the steel slab, the residence time at which the center temperature is 1100° C. or higher is set to less than 2 hours (however, 0 is not included). If this residence time is too long, sulfides with a low Mg content increase, resulting in a decrease in the fatigue strength of the non-oriented electrical steel sheet.
• the hot rolling conditions are not particularly limited.
• the final rolling temperature during finish rolling can be 700 to 1050°C.
• the coiling temperature for hot rolling is 700° C. or higher.
• the coiling temperature for hot rolling is, for example, 700 to 1000°C. If the coiling temperature is lower than 700° C., S, which was in a solid solution state at that time, forms MnS by itself, and MnS containing no Mg is likely to be formed, which is not preferable. Other conditions are not particularly limited.
• Hot-rolled sheet annealing may be omitted.
• the hot-rolled sheet annealing can be carried out, for example, by continuous annealing at 950° C. or higher and 1050° C. or lower for 10 seconds or longer and 3 minutes or shorter.
• Cold rolling can be performed, for example, at a temperature range of room temperature to 300° C. and a rolling reduction of 70 to 90%.
• finish annealing is performed at a low temperature. Specifically, finish annealing is performed with a maximum temperature of 700 to 900° C. and a soaking time of 10 to 60 seconds, for example.
• the soaking time means the time during which the highest temperature reached -10°C is maintained. A more optimum maximum temperature may be adjusted as appropriate according to the chemical composition.
• the final annealing at a low temperature suppresses the growth of crystal grains, makes the average crystal grain size of the recrystallized portion 50 ⁇ m or less, and makes it possible to obtain a non-oriented electrical steel sheet having high tensile strength and excellent fatigue strength.
• the non-oriented electrical steel sheet manufactured as described above has a high tensile strength of 580 MPa or more and excellent fatigue strength.
• the fatigue strength can be obtained by a pulsating tensile test in accordance with JIS Z2273:2011. Specifically, a fatigue test piece is taken from a non-oriented electrical steel sheet in which the rolling direction and the tensile direction are matched. A JIS2-15 test piece was used as the test piece shape. After polishing the end faces of the parallel portion and the R portion with No. 600 abrasive paper, a pulsating tensile test is performed at room temperature in an air atmosphere.
• the fatigue strength (MPa) is defined as the maximum stress that did not break after 2 million cycles of repeated stress loads at a stress ratio of 0.10 and a frequency of 20 Hz. In the present invention, if the fatigue strength is 450 MPa or more, it is judged to have excellent fatigue strength.
• the present invention is not limited to the above.
• the above is just an example, and any thing that has substantially the same configuration as the technical idea described in the claims of the present invention and produces similar effects is the technology of the present invention. included in the scope of
• the method for manufacturing a non-oriented electrical steel sheet according to the present embodiment may include other known manufacturing steps.
• Example 1 The chemical composition is Si: 3.3%, sol. Al: 0.7%, Mn: 1.2%, C: 0.002%, P: 0.02%, S: 0.0010%, Ti: 0.0015%, balance: Fe and impurity steel type (Mg-free) and a steel type containing Mg: 0.0013% (Mg added) in place of part of Fe in the above steel type were used to produce electrical steel sheets, and the tensile strength and fatigue strength were measured by the method described above. measured in
• the cooling rate from 1300 ° C. to 1200 ° C. in casting is 30 ° C./s, and the residence time at the center temperature of 1100 ° C. or higher in heating the steel slab before hot rolling is 1 hour.
• the temperature was 750°C, and the final annealing temperature was changed between 750 and 1000°C.
• Table 1 shows the tensile strength and fatigue strength of each electrical steel sheet with different finish annealing temperatures and with or without Mg. In this test, a tensile strength of 580 MPa or more and a fatigue strength of 450 MPa or more were judged to be good. Good results were obtained when the final annealing temperature was set to 750 to 800° C. in the magnetic steel sheet to which Mg was added having the above chemical composition.
• Example 2 The non-oriented electrical steel sheets having the components shown in Tables 2A and B were subjected to the cooling rate during casting shown in Table 3A, the residence time at 1100 ° C. or more in the heating furnace before hot rolling, the coiling temperature, and the maximum reach of finish annealing.
• Non-oriented electrical steel sheets having thicknesses shown in Table 3A were produced under temperature conditions.
• the microstructure of the steel sheet of each test number was observed by the following method, and the grain size of the recrystallized part of the ferrite structure was determined.
• a test piece having a surface including the rolling direction and the plate thickness direction of each steel plate was prepared, and after polishing the observation surface of the test piece to a mirror surface, it was immersed in a 3% nital corrosive solution for 10 seconds to reveal the structure by etching. let me The etched observation surface was observed with an optical microscope at a magnification of 100 times for 3 fields of view.
• a region where the ferrite grain aspect ratio (length in the rolling direction / length in the plate thickness direction) is 3 or less is specified, and the average grain size of ferrite in that region is measured according to JIS G 0551: 2013 "Steel-Microscope of grain size. Test method”.
• the iron loss W 10/400 at a frequency of 400 Hz and a magnetic flux density of 1.0 T of a non-oriented electrical steel sheet is measured by the exciting current method in the method for measuring the magnetic properties of an electrical steel strip using an Epstein tester described in JIS C 2550-1:2011. obtained by
• Results are shown in Table 3B.
• "Mg: 5% or less” in Table 3B is the number of “inclusions having a Mg content of 5% by mass or less and a Mn content of 5% or more" per 1 mm2
• “Mg: more than 5%” is , means the number of “inclusions having a Mg content of more than 5% and a Mn content of 5% or more” per 1 mm 2
• the ratio is "a Mg content of 5% by mass or less and a Mn content of 5% or less”.
• % or more” means the ratio of the number of “inclusions having a Mg content of more than 5% and a Mn content of 5% or more”.
• “5 ⁇ m or more” in Table 3 means the number density (pieces/mm 2 ) of inclusions having an equivalent circle diameter of 5 ⁇ m or more.

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