WO2023132198A1 - 無方向性電磁鋼板 - Google Patents

無方向性電磁鋼板 Download PDF

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Publication number
WO2023132198A1
WO2023132198A1 PCT/JP2022/046098 JP2022046098W WO2023132198A1 WO 2023132198 A1 WO2023132198 A1 WO 2023132198A1 JP 2022046098 W JP2022046098 W JP 2022046098W WO 2023132198 A1 WO2023132198 A1 WO 2023132198A1
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Prior art keywords
layer portion
steel sheet
surface layer
inner layer
electrical steel
Prior art date
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PCT/JP2022/046098
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English (en)
French (fr)
Japanese (ja)
Inventor
善彰 財前
幸乃 宮本
善彦 尾田
智幸 大久保
聡一郎 吉▲崎▼
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JFE Steel Corp
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JFE Steel Corp
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Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to EP22918784.4A priority Critical patent/EP4455319A4/en
Priority to CN202280083598.8A priority patent/CN118434896A/zh
Priority to US18/724,296 priority patent/US20250196471A1/en
Priority to KR1020247019408A priority patent/KR20240105431A/ko
Priority to JP2023526460A priority patent/JP7388597B1/ja
Priority to CA3239603A priority patent/CA3239603A1/en
Publication of WO2023132198A1 publication Critical patent/WO2023132198A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
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    • C21D6/00—Heat treatment of ferrous alloys
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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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    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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    • C21D8/1216—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
    • C21D8/1222—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
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    • 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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    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
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    • C21D8/1272—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
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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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    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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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
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    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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    • C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
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    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/30—Iron, e.g. steel
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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
    • C21D2201/00—Treatment for obtaining particular effects
    • C21D2201/05—Grain orientation
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    • C21D2251/00—Treating composite or clad material
    • C21D2251/02—Clad material

Definitions

  • the present invention relates to a non-oriented electrical steel sheet, particularly to a non-oriented electrical steel sheet having a Si concentration gradient in the thickness direction.
  • drone motors and server fan motors are being driven in a high frequency range of 400Hz to 1kHz from the perspective of miniaturization, weight reduction, and high efficiency.
  • Non-oriented electrical steel sheets used as core materials for such motors are required to have low high-frequency iron loss and high magnetic flux density.
  • a so-called Si gradient magnetic material which controls the Si concentration gradient in the plate thickness direction, has been developed as a method of achieving both high-frequency iron loss reduction and high magnetic flux density.
  • Patent Document 1 there is a concentration gradient of Si in the plate thickness direction, the Si concentration on the surface of the steel plate is higher than the Si concentration in the center of the thickness of the steel plate, and the portion with a Si concentration of 5 to 8% is the steel plate discloses an electrical steel sheet having a thickness of 10% or more in the thickness direction from both surfaces of the plate and a Si concentration at the center of the plate thickness of 3.4% or more.
  • an object of the present invention is to reduce the iron loss and increase the magnetic flux density in a Si gradient magnetic material.
  • the inventors focused on the influence of the components on the magnetic properties of the Si gradient material and conducted repeated studies in order to achieve both low core loss and high magnetic flux density.
  • the Si concentration difference between the surface layer portion and the inner layer portion of the Si gradient material was optimized, and further adding Co and one or two selected from Sn and Sb, high frequency low iron loss and high magnetic flux density was found to be compatible with
  • the gist of the present invention is as follows. 1.
  • a multi-layer electrical steel sheet having a laminated structure of an inner layer portion and surface layer portions located on both sides of the inner layer portion,
  • the surface layer contains Si: 4.0 to 7.0%, C: 0.0010 to 0.0100%, Co: 0.0010% to 0.0100%, and Sn: 0.0010% by mass. 010 to 0.100% and Sb: 0.010 to 0.100%, including any one or two kinds, the balance being Fe and unavoidable impurities
  • the inner layer portion contains Si: 3.5 to 6.5%, C: 0.0010% to 0.0100%, Co: 0.0010% to 0.0100%, and Sn: 0% by mass.
  • ⁇ Si defined as the difference ([Si] 1 - [Si] 0 ) between the Si content in the surface layer: [Si] 1 and the Si content in the inner layer: [Si] 0 is 0.1 to 0.
  • the ratio (t 1 /t) of the total thickness of the surface layer portion: t 1 to the plate thickness: t of the electromagnetic steel sheet is 0.04 to 0.78
  • Magnetic field strength The ratio of saturation magnetization Bs to magnetic flux density B50 at 5000 A/m ( B50 /Bs) is 0.825 or more, and frequency: 800 Hz, maximum magnetic flux density: iron loss at 1.0
  • T W A non-oriented electrical steel sheet in which 10/800 and the thickness t satisfy the following formula (1).
  • Either one or both of the component composition of the surface layer portion and the component composition of the inner layer portion further contain 0.0100% or less in total of one or two selected from Ge and Ga.
  • Either one or both of the component composition of the surface layer portion and the component composition of the inner layer portion further contains 1.00% or less in total of one or more selected from Cu, Cr and Ni in mass%. 4.
  • the non-oriented electrical steel sheet according to any one of 1 to 3.
  • Either one or both of the component composition of the surface layer portion and the component composition of the inner layer portion further contains 0.0200% or less in total of one or more selected from Ca, Mg and REM in mass%. 5.
  • the non-oriented electrical steel sheet according to any one of 1 to 4.
  • any one or both of the component composition of the surface layer portion and the component composition of the inner layer portion further contain 0.0500% or less in total of one or two selected from Mo and W. 1 to 6
  • the non-oriented electrical steel sheet according to any one of 1 to 7 above.
  • ⁇ Si (mass%) defined as the difference in Si content between the surface layer and the inner layer ([Si] 1 - [Si] 0 ), and the total iron loss at 1.0 T, 800 Hz: W 10/800 (W/ kg).
  • 4 is a graph showing the correlation between ⁇ Si and magnetic flux density ratio (B 50 /Bs). 4 is a graph showing the correlation between multilayer ratio and total iron loss (W10 /800 ).
  • the steel for the surface layer was applied to both sides of the steel material for the inner layer so that the ratio of the thickness of each surface layer to the plate thickness (total thickness) of the electromagnetic steel sheet was 0.3 (0.6 in total). After bonding the materials together, they were subjected to hot rolling. As the steel material for the surface layer and the steel material for the inner layer, ingots melted so as to have desired chemical compositions were used. The Si content [Si] 0 of the inner layer portion was set to 4.0%. A plurality of steel materials for the surface layer having different Si contents were prepared so that the Si content [Si] 1 of the surface layer was varied in the range of 4.0% to 7.0%.
  • the C content was 0.0025%
  • the Co content was 0.0030%
  • the Sn content was 0.030%.
  • the balance was Fe and unavoidable impurities.
  • the surface layer had the same composition on both sides of the inner layer.
  • the hot-rolled sheet was annealed at 1000°C for 30 seconds, and then cold-rolled to a thickness of 0.10 mm. Thereafter, finish annealing was performed at 1080°C for 30s to obtain an electrical steel sheet.
  • a test piece with a width of 30 mm and a length of 180 mm was taken from each of the obtained magnetic steel sheets, and the Epstein test was performed to evaluate the magnetic properties.
  • an L-direction test piece was taken so that the length direction of the test piece was in the rolling direction (L direction), and a test piece was taken so that the length direction was perpendicular to the rolling direction (C direction).
  • Equal amounts of the C-direction test pieces were used for measurement, and the average value of the magnetic properties in the L-direction and C-direction was evaluated.
  • FIG. 1 shows ⁇ Si (mass %) defined as the difference in Si content between the surface layer and the inner layer ([Si] 1 - [Si] 0 ) and the total iron loss at 1.0 T and 800 Hz: W 10/ Correlation with 800 (W/kg) is shown.
  • FIG. 2 shows the correlation between ⁇ Si and the magnetic flux density ratio (B 50 /Bs).
  • the "magnetic flux density ratio” refers to the ratio ( B50 /Bs) of saturation magnetization: Bs to magnetic flux density: B50 at a magnetic field strength of 5000 A/m.
  • iron loss can be kept low when ⁇ Si is 0.1% by mass or more and 0.5% by mass or less.
  • the magnetic flux density ratio sharply decreases. This is considered to be due to the following reasons. That is, when the Si content of the surface layer is higher than that of the inner layer, the magnetic permeability of the surface layer is higher than that of the inner layer. As a result, the magnetic flux concentrates on the surface layer and the eddy current loss is reduced. However, if ⁇ Si is excessively large, the difference in lattice constant and the difference in magnetostriction between the surface layer portion and the inner layer portion increase accordingly. As a result, the stress applied when the steel sheet is magnetized increases, so the hysteresis loss increases and the magnetic flux density in the medium magnetic field region decreases.
  • ⁇ Si which is defined as the difference between the Si content in the surface layer portion and the Si content in the inner layer portion ([Si] 1 - [Si] 0 ), is 0.1 to 0.5 mass %.
  • ⁇ Si is 0.2 to 0.4 mass %.
  • the ratio (t 1 /t) of the total thickness of the surface layer: t 1 to the thickness of the multilayer electrical steel sheet: t (hereinafter sometimes referred to as “multilayer ratio”) gives the magnetic properties We considered the impact. That is, electromagnetic steel sheets with different multilayer ratios were produced by the following procedure, and their magnetic properties were evaluated.
  • the “total thickness of the surface layer portion” refers to the sum of the thicknesses of the surface layer portions provided on both sides of the inner layer portion.
  • a steel material for the surface layer portion and a steel material for the inner layer portion were bonded together so that the multilayer ratio was 0.02 to 0.80, and hot rolled.
  • the steel material for the surface layer and the steel material for the inner layer ingots melted so as to have desired chemical compositions were used.
  • the Si content [Si] 1 in the surface layer portion was 6.3%
  • the Si content [Si] 0 in the inner layer portion was 6.0%.
  • C 0.0030%
  • Sn content: 0.050% the balance being Fe and unavoidable impurities.
  • the component composition of the surface layer was the same on both sides of the inner layer.
  • the hot-rolled sheet was annealed at 980°C for 30 seconds, and then cold-rolled to a thickness of 0.08 mm. Thereafter, finish annealing was performed at 1100°C for 30s to obtain an electrical steel sheet.
  • the layer ratio is more than 0.78, the magnetic permeability difference between the surface layer and the inner layer becomes small, so that the magnetic flux penetrates to the inner layer and eddy current loss is also generated from the inner layer. Therefore, iron loss can be reduced by setting the multi-layer ratio to 0.04 to 0.78.
  • the multi-layer ratio (t 1 /t) is set to 0.04 to 0.78 in the present invention.
  • t 1 /t is 0.10-0.70, more preferably 0.30-0.60.
  • the thickness t 1-1 of one surface layer sandwiching the inner layer and the thickness t 1-2 of the other surface layer are preferably the same, but are not necessarily the same. That is, t 1-1 and t 1-2 may have a thickness difference of about 20% (when the thicker one is 100%, the thinner one is 80 to 100%).
  • the thickness of the multi-layered electrical steel sheet is not particularly limited, and may be any value. However, if the multi-layered electrical steel sheet is too thin, cold rolling and annealing in manufacturing the multi-layered electrical steel sheet may become difficult, resulting in an increase in cost. Therefore, from the viewpoint of manufacturing cost reduction, it is preferable to set t to 0.03 mm or more. On the other hand, if t is 0.20 mm or less, the eddy current loss can be further reduced, and as a result, the total iron loss can be further reduced. Therefore, t is preferably 0.20 mm or less.
  • Magnetic flux density ratio B 50 /Bs 0.825 or more
  • Magnetic field strength The ratio of saturation magnetization Bs to magnetic flux density B 50 at 5000 A/m (B 50 /Bs) is 0.825 or more.
  • the hysteresis loss is reduced by texture control, and the eddy current loss is reduced by controlling the Si concentration gradient and multilayer ratio within a predetermined range.
  • the maximum strength value of the ⁇ 100 ⁇ plane accumulation degree is 6.0 or more. can be increased, making it easier to magnetize in this plane.
  • P is also a segregating element, and adding an appropriate amount enhances the effect of increasing the number of ⁇ 100 ⁇ planes. As a result, the magnetic flux density is improved and the hysteresis loss is also reduced. Therefore, it is preferable to set the ⁇ 100 ⁇ plane integration degree to 6.0 or more.
  • both the first surface layer portion provided on one surface of the multilayer electrical steel sheet and the second surface layer portion provided on the other surface have the chemical composition described below.
  • the component composition of the first surface layer portion and the component composition of the second surface layer portion may be the same, but they may be different.
  • the content of an element in the surface layer portion refers to the average content of the element in each surface layer portion.
  • the component composition of the surface layer portion includes Si: 4.0 to 7.0%, C: 0.0010 to 0.0100%, Co: 0.0010% to 0.0100%, and Sn: 0.01%. 010 to 0.100% and one or two of Sb: 0.010 to 0.100%, and the balance is Fe and unavoidable impurities.
  • Si 4.0-7.0%
  • Si is an element that has the effect of increasing the electrical resistance of the steel sheet and reducing the eddy current loss. If the Si content ([Si] 1 ) in the surface layer is less than 4.0%, eddy current loss cannot be effectively reduced. Therefore, the Si content in the surface layer is set to 4.0% or more, preferably 4.5% or more. On the other hand, when the Si content in the surface layer portion exceeds 7.0%, the magnetic flux density decreases due to a decrease in saturation magnetization. Therefore, the Si content in the surface layer is 7.0% or less, preferably less than 6.8%, and more preferably 6.5% or less.
  • the Si content of 4.0 to 7.0% in the surface layer means that the average Si content in the first surface layer is 4.0 to 7.0%, and It means that the average Si content in the second surface layer portion is 4.0 to 7.0%.
  • the average Si content in the first surface layer portion and the average Si content in the second surface layer portion may be the same or different. Similar definitions apply to other elements shown below.
  • C 0.0010 to 0.0100%
  • C is an element that segregates at grain boundaries to increase the grain boundary strength and improve the workability of the material. Adding 0.0010% or more of C improves the elongation of the material. Therefore, the lower limit is set to 0.0010%. Preferably, it is 0.0015% or more. On the other hand, if the addition amount exceeds 0.0100%, the core loss increases due to magnetic aging, so the upper limit is made 0.0100%. Preferably, it is 0.0060% or less.
  • Co 0.0010-0.0100%
  • the texture after the final annealing can be greatly improved, the magnetic flux density can be improved, and the hysteresis loss can be reduced.
  • the Co content is set to 0.0010% or more in order to obtain the above effect. Preferably, it is 0.0015% or more.
  • the Co content exceeds 0.0100%, the effect is saturated and the cost is increased. Therefore, the Co content is set to 0.0100% or less. Preferably, it is 0.0050% or less.
  • Sn 0.010-0.100%
  • Sn 0.010-0.100%
  • Sn content 0.010% or more in order to obtain the above effect. Preferably, it is 0.020% or more.
  • Sn content exceeds 0.100%, the effect is saturated, and in addition, the manufacturability is lowered and the cost is increased. Therefore, the Sn content is set to 0.100% or less. Preferably, it is 0.080% or less.
  • Sb 0.010-0.100%
  • the addition of Sb greatly improves the texture after final annealing, improves the magnetic flux density, and reduces the hysteresis loss.
  • the Sb content is set to 0.010% or more in order to obtain the above effect. Preferably, it is 0.020% or more.
  • the Sb content exceeds 0.100%, the effect is saturated, and in addition, the manufacturability is lowered and the cost is increased. Therefore, the Sb content is set to 0.100% or less. Preferably, it is 0.080% or less.
  • P in the range of 0.100% or less as needed.
  • P 0.100% or less
  • Sn, Sb, and Co addition of P can greatly improve the texture, improve the magnetic flux density, and reduce the hysteresis loss.
  • the P content is preferably 0.010% or more in order to obtain the above effects. More preferably, it is 0.030% or more.
  • the P content is preferably 0.100% or less. More preferably, it is 0.070% or less.
  • any one or more of the following elements can be contained as necessary.
  • Total of one or two selected from Ge and Ga: 0.0100% or less Ge and Ga have the effect of improving texture.
  • the total content of one or two selected from Ge and Ga is preferably 0.0005% or more in order to obtain the above effect. More preferably, it is 0.0020% or more.
  • the content should be 0.0100% or less. More preferably, it is 0.0050% or less.
  • the total content of one or more selected from Cu, Cr and Ni should be 0.03% or more. is preferred.
  • the content is made 1.00% or less.
  • Total of one or more selected from Ca, Mg and REM 0.0200% or less Ca, Mg and REM have the effect of forming stable sulfides and improving grain growth.
  • the above effect is saturated. Therefore, when at least one of Ca, Mg and REM is added, the total content is 0.0200% or less.
  • Zn 0.0500% or less
  • Zn has the effect of suppressing nitriding during finish annealing.
  • Zn is preferably contained in an amount of 0.0010% or more. More preferably, it is 0.0020% or more.
  • Zn is added in an amount exceeding 0.0500%, sulfide is formed to increase iron loss. More preferably, it is 0.0100% or less.
  • Both Mo and W are elements effective in suppressing surface defects (scouring) of non-oriented electrical steel sheets. Since the non-oriented electrical steel sheet according to the present invention is a high-alloy steel and the surface is easily oxidized, the occurrence rate of scabs due to surface cracks is high. By adding a very small amount of Ni, the above-mentioned cracks can be suppressed. This effect is difficult to obtain sufficiently when the sum of one or more of Mo and W is less than 0.0010%, so when adding one or both of Mo and W, 0.0010% It is preferable to set it as above. On the other hand, even if one or both of Mo and W are added in excess of 0.0500%, the above effect is saturated and the alloy cost only increases. Therefore, when one or both of Mo and W are added, the content should be 0.0500% or less.
  • the surface layer portion has a component composition containing the above elements with the balance being Fe and unavoidable impurities.
  • Al is mentioned as an example of the element which can be contained in an electrical steel plate as said unavoidable impurity.
  • the component composition of the inner layer portion refers to the average content of the element in the inner layer portion. That is, the component composition of the inner layer portion includes Si: 3.5 to 6.5%, C: 0.0010% to 0.0100%, Co: 0.0010% to 0.0100%, and Sn: 0%. 0.010 to 0.100% and Sb: 0.010 to 0.100%, and the balance is Fe and unavoidable impurities.
  • the Si content in the inner layer portion is set to 3.5% or more. Preferably, it is 4.0% or more.
  • the Si content in the inner layer portion exceeds 6.5%, there arises a problem that the core cracks during punching of the motor core. Therefore, the Si content in the inner layer is set to 6.5% or less.
  • the Si content in the inner layer is preferably 6.0% or less.
  • C 0.0010 to 0.0100%
  • C is an element that segregates at grain boundaries to increase the grain boundary strength and improve the workability of the material. Adding 0.0010% or more of C improves the elongation of the material. Therefore, the lower limit is set to 0.0010%. Preferably, it is 0.0015% or more. On the other hand, if the addition amount exceeds 0.0100%, the iron loss increases due to magnetic aging, so the upper limit is made 0.0100%. Preferably, it is 0.0060% or less.
  • Co 0.0010-0.0100%
  • the texture after the final annealing can be greatly improved, the magnetic flux density can be improved, and the hysteresis loss can be reduced.
  • the Co content should be 0.0010% or more in order to obtain the above effect. Preferably, it is 0.0015% or more.
  • the Co content is set to 0.0100% or less. Preferably, it is 0.0050% or less.
  • Sn and Sb 0.010 to 0.100% Sn: 0.010-0.100%
  • Sn the texture after the final annealing can be greatly improved, the magnetic flux density can be improved, and the hysteresis loss can be reduced.
  • the Sn content should be 0.010% or more in order to obtain the above effect. Preferably, it is 0.020% or less.
  • the Sn content exceeds 0.100%, the effect is saturated, and in addition, the manufacturability is lowered and the cost is increased. Therefore, the Sn content is set to 0.100% or less. Preferably, it is 0.080% or less.
  • Sb 0.010-0.100%
  • the addition of Sb greatly improves the texture after final annealing, improves the magnetic flux density, and reduces the hysteresis loss.
  • the Sb content is set to 0.010% or more in order to obtain the above effect. Preferably, it is 0.020% or more.
  • the Sb content exceeds 0.100%, the effect is saturated, and in addition, the manufacturability is lowered and the cost is increased. Therefore, the Sb content is set to 0.100% or less. Preferably, it is 0.080% or less.
  • P can be contained in the range of 0.100% or less as needed. P: 0.100% or less Similar to Sn, Sb, and Co, addition of P can greatly improve the texture, improve the magnetic flux density, and reduce the hysteresis loss.
  • the P content is preferably 0.010% or more in order to obtain the above effect. More preferably, it is 0.030% or more.
  • the P content is preferably 0.100% or less. More preferably, it is 0.070% or less.
  • any one or more of the following elements can be contained as necessary.
  • Total of one or two selected from Ge and Ga: 0.0100% or less Ge and Ga have the effect of improving texture.
  • the total content of one or two selected from Ge and Ga is preferably 0.0005% or more in order to obtain the above effect. More preferably, it is 0.0020% or more.
  • the content should be 0.0100% or less. More preferably, it is 0.0050% or less.
  • the total content of one or more selected from Cu, Cr and Ni should be 0.03% or more. is preferred.
  • the content is made 1.00% or less.
  • the above effect is saturated. Therefore, when at least one of Ca, Mg and REM is added, the total content is 0.0200% or less.
  • Zn 0.0500% or less
  • Zn has the effect of suppressing nitriding during finish annealing.
  • Zn is preferably contained in an amount of 0.0010% or more. More preferably, it is 0.0020% or more.
  • Zn is added in an amount exceeding 0.0500%, sulfide is formed to increase iron loss. More preferably, it is 0.0100% or less.
  • Both Mo and W are elements effective in suppressing surface defects (scouring) of non-oriented electrical steel sheets. Since the non-oriented electrical steel sheet according to the present invention is a high-alloy steel and the surface is easily oxidized, the occurrence rate of scabs due to surface cracks is high. By adding a very small amount of Ni, the above-mentioned cracks can be suppressed. This effect is difficult to obtain sufficiently when the sum of one or more of Mo and W is less than 0.0010%, so when adding one or both of Mo and W, 0.0010% It is preferable to set it as above. On the other hand, even if one or both of Mo and W are added in excess of 0.0500%, the above effect is saturated and the alloy cost only increases. Therefore, when one or both of Mo and W are added, the content should be 0.0500% or less.
  • the method for manufacturing the electrical steel sheet of the present invention is not particularly limited, and any method can be used.
  • One example of the manufacturing method is to clad steel materials with different Si contents.
  • the chemical composition of the steel material can be adjusted, for example, by blowing materials having different components in a converter and degassing the molten steel.
  • the method of cladding is not particularly limited, but for example, a steel slab (steel material) for the surface layer and a steel slab (steel material) for the inner layer having the above-described chemical composition are prepared, and the final multilayer ratio is desired
  • the steel slabs for the surface layer may be pasted on both sides of the steel slab for the inner layer with a thickness that gives the value of , and then rolled.
  • the rolling can be, for example, one or more selected from the group consisting of hot rolling, warm rolling and cold rolling. Generally, a combination of hot rolling followed by warm rolling or hot rolling followed by cold rolling is preferred. It is preferable to perform hot-rolled sheet annealing after the hot rolling. Also, the warm rolling and cold rolling can be performed twice or more with intermediate annealing intervening.
  • the finishing temperature and coiling temperature in hot rolling are not particularly limited, and may be determined according to a conventional method. After the rolling, finish annealing is performed.
  • siliconizing treatment can also be used as another manufacturing method.
  • the Si content of the surface layer portions on both sides of the steel sheet can be increased by performing the siliconizing treatment on a steel sheet having a constant Si content in the thickness direction.
  • the method of siliconizing treatment is not particularly limited, and any method can be used.
  • a method can be used in which Si is deposited on the surface of the steel sheet by a chemical vapor deposition method (CVD method) and then heat-treated to diffuse Si into the steel sheet.
  • CVD method chemical vapor deposition method
  • the Si content in the surface layer portion and the inner layer portion can be controlled by adjusting the deposition amount of Si by the CVD method and the heat treatment conditions.
  • multilayer electrical steel sheets were produced by the procedure described below, and their magnetic properties were evaluated.
  • No. 76 two types of steel slabs were prepared, one for the surface layer portion having the chemical composition shown in Table 1 and the other for the inner layer portion having the chemical composition shown in Table 2.
  • the steel slabs for the surface layer were laminated on both sides of the steel slab for the inner layer, and the outer periphery of the laminated steel slabs was welded. Therefore, the component composition of the surface layer is the same on both sides of the inner layer.
  • the chemical composition of the steel slab was adjusted by degassing after blowing in a converter. Note that the above chemical composition is also retained in the finally obtained multi-layered electrical steel sheet.
  • the laminated steel slabs were heated at 1120° C. for 1 hour and then hot rolled to a thickness of 2.0 mm to obtain a hot rolled steel sheet.
  • the hot rolling finishing temperature in the hot rolling was set to 800°C.
  • the hot-rolled steel sheet was coiled at a coiling temperature of 610°C, and then subjected to hot-rolled steel annealing at 940°C for 30 seconds. After that, pickling and cold rolling were performed, and annealing was performed at the finish annealing temperature shown in Table 3 to obtain an electrical steel sheet.
  • Table 3 shows the thickness of the finally obtained electrical steel sheet: t and the ratio of the thickness of the surface layer to t: t1 (multilayer ratio).
  • No. Multilayer electrical steel sheets Nos. 28, 29, 30, 31, 34, and 35 were manufactured by a siliconizing method. Specifically, a cold-rolled steel sheet having a Si content of 3.7% and a thickness of 0.1 mm was subjected to siliconizing and diffusion treatment at 1200°C. The average value of the Si content in the entire plate thickness of the steel sheet was calculated, and the portion having a higher Si concentration than the average value was defined as the surface layer portion, and the portion having a lower Si concentration than the average value was defined as the inner layer portion. The Si content in the surface layer portion is the average value of the Si amount in the surface layer portion.
  • Magnetic properties Next, the magnetic properties of each of the obtained electrical steel sheets were measured. The magnetic measurement was performed using a 25 cm Epstein frame according to JIS C 2550-1. As the magnetic properties, iron loss at 1.0 T and 800 Hz: W 10/800 (W/kg), magnetic field strength: magnetic flux density at 5000 A/m: B 50 , and saturation magnetization Bs were measured. These measurement results are shown in Table 4.
  • the electrical steel sheets of the invention examples that satisfy the conditions of the present invention have excellent properties such as low high-frequency iron loss and high magnetic flux density.
  • the electrical steel sheet of the present invention is very suitably used as a core material for motor cores such as hybrid electric vehicles, electric vehicles, vacuum cleaners, high-speed generators, air conditioner compressors, and machine tools that are driven at high frequencies, transformers, reactors, and the like. be able to.
  • motor cores such as hybrid electric vehicles, electric vehicles, vacuum cleaners, high-speed generators, air conditioner compressors, and machine tools that are driven at high frequencies, transformers, reactors, and the like. be able to.

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