• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    an unoriented electrical steel sheet is provided in which core loss is reduced more than is conventionally the case. this unoriented electrical steel sheet is characterized by having a component composition that contains, in % by mass, c: 0.05% or less; si: 0.1 to 7.0%; al: 0.1 to 3.0%; min: 0.03 to 3.0%; p: 0.2% or less; s: 0.005% or less; n: 0.005% or less; and o: 0.01% or less, may still discretionally contain a prescribed amount of one or more of sn, sb, ca, mg, rem, cr, ti, nb, ve zr, has a remainder of fe and impurities unavoidable, where the sheet thickness is less than 0.30 mm, and the arithmetic mean roughness ra of a ferrite surface is 0.2 ¿m or less, given a cutting wavelength ¿c = 20 ¿m .
    公开号:BR112017003067B1
    申请号:R112017003067-5
    申请日:2015-08-18
    公开日:2021-08-17
    发明作者:Tomoyuki Okubo；Yoshihiko Oda；Hiroaki Nakajima
    申请人:Jfe Steel Corporation；
    IPC主号:
    专利说明:

    FIELD OF TECHNIQUE
    [0001] The disclosure refers to an unoriented electrical steel sheet suitable for an iron core material of a motor that rotates at relatively high speed such as an HEV or EV drive motor, and a method of manufacturing the same. BACKGROUND
    [0002] Unoriented electrical steel sheets are materials used as iron cores of motors or transformers, and are required to have low iron loss to improve the efficiency of these electrical devices. Iron loss can be effectively reduced by increasing the specific strength or by reducing the sheet thickness. However, an increase in specific strength involves an increase in alloy cost, and a reduction in plate thickness involves an increase in rolling and rebaking costs. A new technique for reducing iron loss is therefore desired.
    [0003] As a different iron loss reduction technique that increases specific strength or reduces sheet thickness, it is known that in a grain-oriented electrical steel sheet, hysteresis loss can be reduced by removing a forsterite film and smoothing the surface. This is due to the fact that a decrease in surface roughness facilitates domain wall displacement. JP 2009-228117 A (PTL 1) proposes a technique of limiting the surface roughness of a steel sheet before final annealing to 0.3 µm or less at arithmetic mean roughness Ra and using an alumina separator as a reco separator - zoning.
    [0004] In an unoriented electrical steel sheet, on the other hand, the influence of surface roughness on iron loss is considered less significant. JP 2001-192788 A (PTL 2) and JP 2001-279403 A (PTL 3) each propose a technique to reduce the surface roughness of an unoriented electrical steel sheet. PTL 2 describes an unoriented electrical steel sheet whose steel sheet surface has a Ra of 0.5 µm or less to suppress a decrease in the stacking factor. PTL 3 describes an unoriented electrical steel sheet that contains 1.5% by mass or more and 20% by mass or less of Cr and whose steel sheet surface has Ra of 0.5 µm or less to reduce high frequency of iron loss. LIST OF QUOTES PATENT LITERATURES
    [0005] PTL 1: JP 2009-228117 A
    [0006] PTL 2: JP 2001-192788 A
    [0007] PTL 3: JP 2001-279403 A SUMMARY PROBLEM OF THE TECHNIQUE
    [0008] However, the technique proposed in PTL 1 refers to a grain-oriented electrical steel sheet, and PTL 1 does not provide any suggestion about reducing the iron loss of a non-oriented electrical steel sheet. The technique proposed in PTL 2 refers to a non-oriented electrical steel sheet, but it aims to improve the stacking factor and is not intended to reduce iron loss. The technique proposed in PTL 3 aims to reduce the high frequency of iron loss of a non-oriented electrical steel sheet, but a greater reduction in iron loss is desired.
    [0009] It could be useful, therefore, to provide an unoriented electrical steel sheet with less iron loss than conventional unoriented electrical steel sheets, and a method of fabrication thereof. SOLUTION TO THE PROBLEM
    [0010] The influence of surface roughness was examined in the following way, and a new idea was acquired in the control of surface roughness. In the case of applying an external magnetic field to a steel sheet that has surface roughness to displace its domain wall, the magnetostatic energy of the surface increases with the domain wall displacement and thus the domain wall is subjected to a force of restoration. Restoration strength is not only affected by the depth of roughness, but also affected by the wavelength of roughness. In detail, in the case where the roughness changes at a wavelength greater than the domain wall displacement distance, even when the domain wall is displaced, the magnetostatic energy change is small and, consequently, the force of restoration exerted on the domain wall is small. In the case where the roughness changes at a wavelength less than the domain wall displacement distance (ie fine roughness), on the other hand, the restoring force exerted on the domain wall is large.
    [0011] A grain-oriented electrical steel sheet has a grain size of about 10 mm and a domain width of about 1 mm, and thus the domain wall displacement distance is about 1 mm. An unoriented electrical steel sheet has a grain size of about 100 µm, and a domain width and domain wall displacement distance of about 10 µm, which are very small. Consequently, it is considered that to reduce the iron loss of unoriented electrical steel sheet, it is necessary to evaluate the fine roughness obtained by removing the curl on the long wavelength side at a cutting wavelength of about several ten µm and reduce fine roughness. Such fine roughness is hereinafter also called "microroughness".
    [0012] PTL 1 describes a reduction in Ra of the steel sheet surface of a grain oriented electric steel sheet, and PTL 2 and PTL 3 describe a reduction in Ra of the steel sheet surface of a non-grained electric steel sheet. oriented. However, these techniques do not have a clear cut wavelength, and are not related to the aforementioned microroughness. The focus is on microroughness of a wavelength less than the domain wall displacement distance. The technical idea is therefore fundamentally different from those of conventional techniques.
    [0013] As a result of conducting the intensive study based on the idea described above, it was found that although the loss of hysteresis increases when the plate thickness of an unoriented electrical steel sheet is less than 0.30 mm in a As a typical manufacturing method, this increase in hysteresis loss is suppressed by reducing microroughness.
    [0014] The following is provided: (1) An unoriented electrical steel sheet that has a chemical composition that contains (consisting of), in % by mass:C: 0.05% or less;Si: 0.1 % or more and 7.0% or less; Al: 0.1% or more and 3.0% or less; Mn: 0.03% or more and 3.0% or less; P: 0.2% or less;S: 0.005% or less;N: 0.005% or less; eO: 0.01% or less, the balance consisting of Fe and accidental impurities, where a sheet thickness is less than 0.30 mm, and the arithmetic mean roughness Ra of a steel substrate surface at the wavelength of shear Xc = 20 μm is 0.2 μm or less.(2) Electric steel sheet not oriented in accordance with the above (1), where the chemical composition contains, in % by mass, one or more of Sn and Sb: 0.01% or more and 0.2% or less in total. (3) Electric steel sheet not oriented according to the above (1) or (2), in which the chemical composition contains, in % by mass, one or more of Ca, Mg, and REM: 0.0005% or more and 0.010% or less in total. (4) Electric steel sheet not oriented according to any of the above (1) to (3 ), in which the chemical composition contains, in % by mass, Cr: 0.1% or more and 20% or less. (5) Electric steel sheet not oriented according to any of the above (1) to ( 4), in which the chemical composition contains, in % by mass, one or more of and Ti, Nb, V, and Zr: 0.01% or more and 1.0% or less in total. (6) A method of manufacturing an unoriented electrical steel sheet that includes: heating a steel plate that has the chemical composition according to any one of the above (1) to (5); hot rolling the steel plate to a hot rolled steel plate; optionally, annealing the hot strip of the hot rolled steel plate; cold-rolling the hot-rolled steel sheet one or two or more times with intermediate annealing between them, into a cold-rolled steel sheet whose sheet thickness is less than 0.30 mm; and finally, annealing the cold-rolled steel sheet, where the arithmetic mean roughness Ra of a roller surface in a final pass of the last cold-rolling at the cutting wavelength Xc = 20 μm is 0.2 μm or any less. ADVANTAGEOUS EFFECT
    [0015] It is therefore possible to provide an unoriented electrical steel sheet with reduced iron loss by reducing the microroughness of the steel substrate surface without significantly limiting the steel components. It is also possible to provide a method of advantageously manufacturing a non-oriented electrical steel sheet with reduced iron loss by reducing the microroughness of the steel substrate surface. BRIEF DESCRIPTION OF THE DRAWINGS
    [0016] In the attached Figures:
    [0017] Figure 1 is a graph illustrating the relationship between the arithmetic mean roughness Ra (cut wavelength Xc = 20 μm) of the steel substrate surface and the loss of hysteresis Wh10/50 at various plate thicknesses. DETAILED DESCRIPTION OF NON-ORIENTED ELECTRIC STEEL SHEET
    [0018] Next, an electrical steel sheet not oriented according to one of the disclosed modalities is described. The reasons for limiting the chemical composition of steel are described first. In this description, the "%" indicating the content of each element denotes "% by mass".C: 0.05% or less
    [0019] C can be used to reinforce steel. When the C content exceeds 0.05%, operation is difficult. The upper limit of the C content is therefore 0.05%. In case C is not used for reinforcement, the C content is preferably 0.005% or less to suppress magnetic aging. Si: 0.1% or more and 7.0% or less
    [0020] Si, when 0.1% or more is added, has an effect of increasing the specific strength of the steel to reduce iron loss. When the Si content exceeds 7.0%, however, iron loss increases. The Si content is therefore 0.1% or more and 7.0% or less. The Si content is preferably 1.0% or more and 5.0% or less, in terms of the balance between iron loss and workability. Al: 0.1% or more and 3.0% or any less
    [0021] Al, when 0.1% or more is added, has an effect of increasing the specific strength of the steel to reduce iron loss. When the Al content exceeds 3.0%, however, casting is difficult. The Al content is therefore 0.1% or more and 3.0% or less. The Al content is preferably 0.3% or more and 1.5% or less. Mn: 0.03% or more and 3.0% or less
    [0022] Mn, when 0.03% or more is added, prevents hot brittleness of the steel. It also has an effect of increasing specific resistance to reduce iron loss. When the Mn content exceeds 3.0%, however, iron loss increases. The Mn content is therefore 0.03% or more and 3.0% or less. The Mn content is preferably 0.1% or more and 2.0% or less. P: 0.2% or less
    [0023] P can be used to reinforce steel. When the P content exceeds 0.2%, however, the steel becomes brittle and is difficult to function. The P content is therefore 0.2% or less. The P content is preferably 0.01% or more and 0.1% or less. S: 0.005% or less
    [0024] When the S content exceeds 0.005%, precipitates such as MnS increase and grain growth degrades. The upper limit of the S content is therefore 0.005%. The S content is preferably 0.003% or less. N: 0.005% or less
    [0025] When the N content exceeds 0.005%, precipitates such as AlN increase and grain growth degrades. The upper limit of the N content is therefore 0.005%. The N content is preferably 0.003% or less. O: 0.01% or less
    [0026] When the O content exceeds 0.01%, the oxides increase and grain growth degrades. The upper limit of the O content is therefore 0.01%. The O content is preferably 0.005% or less.
    [0027] In addition to the aforementioned components, the following components may be added.Sn, Sb: 0.01% or more and 0.2% or less in total
    [0028] Sn and/or Sb, when 0.01% or more is added, have a [111] reduction effect of crystal grains on the recrystallization texture to improve the magnetic flux density. They have an effect of preventing nitriding and oxidation in the final annealing or stress relief annealing to suppress an increase in iron loss. When the total content of Sn and/or Sb exceeds 0.2%, however, the effects saturate. The total content of Sn and/or Sb is therefore 0.01% or more and 0.2% or less. The total content of Sn and/or Sb is preferably 0.02% or more and 0.1% or less. Ca, Mg, REM: 0.0005% or more and 0.010% or less in total
    [0029] Ca, Mg and/or REM, when 0.0005% or more is added, have a sulfide thickening effect to improve grain growth. When the total content of Ca, Mg and/or REM exceeds 0.010%, however, grain growth degrades. The total content of Ca, Mg and/or REM is therefore 0.0005% or more and 0.010% or less. The total content of Ca, Mg and/or REM is preferably 0.001% or more and 0.005% or less. Cr: 0.1% or more and 20% or less
    [0030] Cr, when 0.1% or more is added, has the effect of increasing the specific strength of the steel to reduce iron loss. A large amount of Cr can be added due to the low hardness of the steel. When the Cr content exceeds 20%, however, decarburization is difficult and the carbides precipitate and cause an increase in iron loss. The Cr content is therefore 0.1% or more and 20% or less. The Cr content is preferably 1.0% or more and 10% or less. Ti, Nb, V, Zr: 0.01% or more and 1.0% or less in total
    [0031] Ti, Nb, V and/or Zr are elements that form carbide or nitride. When the total content of Ti, Nb, V and/or Zr is 0.01% or more, the strength of the steel can be improved. When the total content of Ti, Nb, V and/or Zr exceeds 1.0%, however, the effect saturates. The total content of Ti, Nb, V and/or Zr is therefore 0.01% or more and 1.0% or less. The total content of Ti, Nb, V and/or Zr is preferably 0.1% or more and 0.5% or less. In the case of not using Ti, Nb, V and/or Zr for reinforcement, the total content of Ti, Nb, V and/or Zr is preferably 0.005% or less to improve grain growth.
    [0032] The balance, unlike the aforementioned elements, is Fe and incidental impurities.
    [0033] It is important that, in electrical steel sheet not oriented in this modality, the arithmetic mean roughness Ra of the steel substrate surface at the cutting wavelength Xc = 20 μm is 0.2 μm or less. By reducing the fine roughness to a wavelength less than the domain wall displacement distance, hysteresis loss can be reduced in this way. The arithmetic mean roughness Ra is preferably 0.1 µm or less.
    [0034] The surface roughness measurement is performed as defined in JIS B 0601, JIS B 0632, JIS B 0633 and JIS B 0651. Since the measurement is performed on the steel substrate surface, if any coating is applied to the surface of steel substrate, the coating will be removed by boiled alkali or the like. A measuring machine that has the ability to accurately detect microroughness of several µm or less in wavelength is selected to measure surface roughness. A typical stylet-type surface roughness tester has a stylet tip radius of several μm and is therefore not suitable for detecting microroughness. Consequently, a three-dimensional scanning electron microscope is used to measure the arithmetic mean roughness Ra in the development. To detect microroughness, the reference length and the cutoff wavelength (cutoff value) Xc are set to 20 µm. The Xc/Xs cut ratio is not particularly designated, but is desirably 100 or more. The measurement is performed with an Xc/Xs cut-off ratio of 100 on development. The measurement directions are the rolling direction and the direction orthogonal to the rolling direction. The measurement is performed three times in each direction, and the average value is used.
    [0035] The microroughness obtained by, for example, a typical stylet-type surface roughness meter does not affect the magnetic property and therefore is not particularly limited. To improve the stacking factor, it is desirable that the arithmetic mean roughness Ra of the steel substrate surface obtained at the cut wavelength Xc = 0.8 mm and at the cut ratio Xc/Xs = 300 is 0.5 μm or any less.
    [0036] In this modality, the plate thickness is less than 0.30 mm. In the case where the plate thickness is less than 0.30 mm, the iron loss reduction effect limiting the arithmetic mean roughness Ra of the steel substrate surface at the cutting wavelength Xc = 20 μm to 0.2 μm or less is achieved. The sheet thickness is preferably 0.25 mm or less and more preferably 0.15 mm or less. When the sheet thickness is less than 0.05 mm, the manufacturing cost increases. Consequently, the sheet thickness is preferably 0.05 mm or more. MANUFACTURING METHOD OF UNORIENTED ELECTRIC STEEL SHEET
    [0037] Next, a method of manufacturing a non-oriented electrical steel sheet according to one of the disclosed modalities is described. Molten steel adjusted to the above chemical composition can be formed into a steel slab by exudation and typical ingot casting or continuous casting, or into a thin slab or thinner cast steel with a thickness of 100 mm or less by direct casting.
    [0038] The steel plate is then heated by a typical hot rolled method onto a hot rolled steel plate.
    [0039] The hot rolled steel sheet is then subjected to hot strip annealing as required. Hot-band re-baking is intended to prevent rib formation or improve magnetic flux density, and can be omitted if not required. A preferred condition is 900°C to 1100°C x 1s to 300s in the case of using a continuous annealing line, and 700°C to 900°C x 10 min to 600 min in the case of using a continuous annealing line. batch.
    [0040] The hot rolled steel sheet is then pickled, cold rolled one or two or more times with intermediate annealing between them, into a cold rolled steel sheet to the final sheet thickness. The final plate thickness is less than 0.30 mm.
    [0041] A preferred method to limit the arithmetic mean roughness Ra of the steel substrate surface at the cutting wavelength Xc = 20 μm to 0.2 μm or less is to adjust the surface roughness of the laminating rollers in the final pass of the last cold rolling. In this modality, the arithmetic mean roughness Ra of the roller surface in the final pass of the last cold rolling at the cutting wavelength Xc = 20 µm is 0.2 µm or less. At least the final pass is preferably dry rolled to efficiently transfer the roller surface to the steel. The surface of cold rolled steel sheet can be smoothed in this way. In case of not smoothing the steel substrate surface in cold rolling, a step, such as chemical polishing or electropolishing, can be added after cold rolling or final annealing to define the arithmetic mean roughness Ra of the steel substrate surface at the cut-off wavelength Xc = 20 µm to 0.2 µm or less. In terms of fabrication cost, however, the steel substrate surface is preferably smoothed during cold rolling.
    [0042] After the final cold rolling, the cold rolled steel sheet is subjected to final annealing. If the sheet steel surface is oxidized or nitrided in the final annealing, the magnetic property will degrade significantly. To prevent oxidation, the annealing atmosphere is preferably a reducing atmosphere. For example, it is preferable to use a mixed atmosphere of N2-H2 with an H2 concentration of 5% or more, and lower the dew point to control the PH2O/PH2 to 0.05 or less. To avoid nitriding, the partial pressure of N2 in the furnace atmosphere is preferably 95% or less and more preferably 85% or less. The addition of one or more of Sn and Sb in an amount of 0.01% or more and 0.2% or less in total to steel is particularly effective in suppressing oxidation and nitriding. A preferred annealing condition is 700°C to 1100°C x 1s to 300s. The annealing temperature can be increased in case of placing importance on iron loss, and decreased in case of placing importance on strength.
    [0043] After the final annealing, the insulating coating is applied to the steel sheet surface as needed, thereby obtaining a product sheet (non-oriented electrical steel sheet). The insulating coating can be a well-known coating. For example, inorganic coating, organic coating and mixed organic-inorganic coating can be selectively used depending on the purpose.
    [0044] The other fabrication conditions can satisfy a typical fabrication method of an unoriented electrical steel sheet.EXAMPLESEXAMPLE 1
    [0045] A steel plate containing C: 0.0022%, Si: 3.25%, Al: 0.60%, Mn: 0.27%, P: 0.02%, S: 0.0018% , N: 0.0021%, O: 0.0024% and Sn: 0.06%, the balance consisting of Fe and incidental impurities was obtained by steelworks, heated to 1130°C for 30 minutes and then hot-rolled on a hot-rolled steel plate. The hot rolled steel sheet was subjected to hot band annealing at 1000°C x 30s and additionally cold rolled into a cold rolled steel sheet from 0.15 mm to 0.30 mm in sheet thickness . The obtained cold-rolled steel sheet was subjected to final annealing of 1000°C x 10s in an atmosphere of H2:N2 = 30:70 with a dew point of -50°C and then the insulating coating was applied to obtain a product sheet.
    [0046] In the present document, the microroughness of the steel substrate surface of the product plate was modified by adjusting the surface roughness of the laminating rollers in the final pass of the cold lamination. Test pieces of 280 mm x 30 mm were collected from the obtained product plate, and the direct current magnetic measurement was performed by Epstein test to measure the loss of hysteresis Wh10/50 with Bm = 1.0 T and f = 50 Hz In addition, after removing the insulating coating from the product plate by boiled alkali, the surface shape measurement for 100 µm x 100 µm was conducted with an accelerating voltage of 5 kV using 3D-SEM (ERA-8800FE) produced by Elionix Inc., and the arithmetic mean roughness Ra of the steel substrate surface at the cutting wavelength Xc = 20 µm was measured under the condition mentioned above. Figure 1 illustrates the results. The results indicate that the loss of hysteresis was low in the revealed range. In the case where the Ra of the roller surface in the final cold rolling pass at the cutting wavelength Xc = 20 µm was 0.2 µm or less, the arithmetic mean roughness Ra of the steel substrate surface was 0.2 µm or less.EXAMPLE 2
    [0047] A steel plate containing the components shown in Table 1, in which the balance consists of Fe and incidental impurities, was obtained by the steel industry, heated at 1100°C for 30 minutes and then hot rolled onto a steel plate. hot rolled steel. The hot rolled steel sheet was subjected to hot strip annealing of 980°*C x 30s and additionally cold rolled to a cold rolled steel sheet of 0.15 mm in sheet thickness. The obtained cold-rolled steel sheet was subjected to final annealing at 980°C x 10s in an atmosphere of H2:N2 = 20:80 with a dew point of -40°C and then the insulating coating was applied to if you obtain a product plate.
    [0048] In the present document, the microroughness of the steel substrate surface of the product plate has been modified by adjusting the surface roughness of the laminating rollers in the final pass of the cold rolling and applying the dry rolling. In relation to No. 2, the rolling temperature was set at 300°C, and the microroughness was further modified. Test pieces of 280 mm x 30 mm were collected from the obtained product plate, and the direct current magnetic measurement was performed by Epstein test to measure the loss of hysteresis Wh10/400 with Bm = 1.0 T and f = 400 Hz In addition, after removing the insulating coating from the product plate by boiled alkali, the surface shape measurement for 100 µm x 100 µm was conducted with an accelerating voltage of 5 kV using 3D-SEM (ERA-8800FE) produced by Elionix Inc., and the arithmetic mean roughness Ra of the steel substrate surface at the cutting wavelength Xc = 20 µm was measured under the condition mentioned above. The arithmetic mean roughness Ra of the roll surface in the final cold rolling pass was measured by the same method. In addition, the arithmetic mean roughness Ra of the steel substrate surface was measured at a scan rate of 0.5 mm/s and at a cutting wavelength of 0.8 mm using a stylus-type roughness meter. 2 μm in the radius of the stylet tip (produced by Tokyo Seimitsu Co., Ltd.).
    [0049] The results are shown in Table 1. The results indicate that the loss of hysteresis was low in the revealed range. In particular, even in the case where Ra of the steel substrate surface measured by the typical conventional measurement technique with cut-off wavelength Xc = 0.8 mm was 0.2 µm or less, the hysteresis loss was high when Ra at the cutting wavelength Xc = 20 µm defined in the development exceeds 0.2 µm.
    EXAMPLE 3
    [0050] A steel plate containing the components shown in Table 2 with the balance consisting of Fe and incidental impurities was obtained by the steel industry, heated to 1100°C for 30 minutes and then hot rolled into a rolled steel plate the hot. The hot rolled steel sheet was subjected to hot strip annealing at 1000°C x 120s, cold rolled at 0.15 mm for No. 1 and 0.17 mm for Nos. 2 to 12 and then chemically polished to 0.15 mm using an aqueous solution of HF + H2O2, thereby obtaining a cold rolled steel sheet of 0.15 mm in sheet thickness. The obtained cold-rolled steel sheet was subjected to final annealing of 1000°C x 30s in an atmosphere of H2:N2 = 30:70 with a dew point of -50°C and then the insulating coating was applied to if you obtain a product plate.
    [0051] Test pieces of 280 mm x 30 mm were collected from the obtained product plate, and the direct current magnetic measurement was performed by Epstein test to measure the loss of hysteresis Wh10/400 with Bm = 1.0 T and f = 400 Hz. In addition, after removing the insulating coating from the product sheet by boiled alkali, the surface shape measurement for 100 µm x 100 µm was conducted with an accelerating voltage of 5 kV using 3D-SEM (ERA- 8800FE) produced by Elionix Inc., and the arithmetic mean roughness Ra of the steel substrate surface at the cutting wavelength Xc = 20 µm was measured under the condition mentioned above. Additionally, the arithmetic mean roughness Ra of the steel substrate surface was measured at a scan rate of 0.5 mm/s and at a cutting wavelength of 0.8 mm using a 2 stylus-type roughness meter. µm in the radius of the stylet tip (produced by Tokyo Seimitsu Co., Ltd.).
    [0052] The results are shown in Table 2. In the case of carrying out chemical polishing, the Ra of the steel substrate surface measured by the typical conventional measurement technique with cutting wavelength Xc = 0.8 mm was 0 .2 μm or more, but hysteresis loss was low when the Ra at the cut-off wavelength Xc = 20 μm defined in the development was 0.2 μm or less.
    INDUSTRIAL APPLICABILITY
    [0053] The revealed unoriented electrical steel sheet has reduced iron loss by reducing the microroughness of the steel substrate surface without significantly limiting the steel components. This advantageous effect is achieved by a different principle than increasing specific strength or decreasing sheet thickness. Consequently, using the revealed technique along with these techniques can further reduce iron loss.
    权利要求:
    Claims (6)
    [0001]
    1. Unoriented electrical steel sheet, characterized by the fact that it has a chemical composition containing in % by mass: C: 0.05% or less; Si: 0.1% or more and 7.0% or less; Al: 0.1% or more and 3.0% or less; Mn: 0.03% or more and 3.0% or less; P: 0.2% or less; S: 0.005% or less; N: 0.005% or less; eO: 0.01% or less, with the balance consisting of Fe and incidental impurities, where a sheet thickness is less than 0.30 mm, and the arithmetic mean roughness Ra of a steel substrate surface at the wavelength cutting depth Xc = 20 μm is 0.2 μm or less,wherein the arithmetic mean roughness Ra of the steel substrate surface obtained at the cutting wavelength Xc = 0.8 mm is 0.5 μm or less.
    [0002]
    2. Non-oriented electrical steel sheet, according to claim 1, characterized in that the chemical composition contains, in % by mass, one or more of Sn and Sb: 0.01% or more and 0.2% or less in total.
    [0003]
    3. Non-oriented electrical steel sheet, according to claim 1 or 2, characterized in that the chemical composition contains, in % by mass, one or more of Ca, Mg and REM: 0.0005% or more and 0.010% or less in total.
    [0004]
    4. Non-oriented electrical steel sheet, according to any one of claims 1 to 3, characterized in that the chemical composition contains, in % by mass, Cr: 0.1% or more and 20% or less.
    [0005]
    5. Non-oriented electrical steel sheet, according to any one of claims 1 to 4, characterized in that the chemical composition contains, in % by mass, one or more of Ti, Nb, V and Zr: 0.01 % or more and 1.0% or less in total.
    [0006]
    6. Method of manufacturing an unoriented electrical steel plate, characterized in that it comprises: heating a steel plate having the chemical composition as defined in any one of claims 1 to 5; hot rolling the steel plate into a hot rolled steel sheet; optionally, annealing the hot strip of the hot rolled steel sheet; cold rolling the hot rolled steel sheet one or two or more times with intermediate annealing between them, on a plate of cold-rolled steel whose sheet thickness is less than 0.30 mm; erecoat the cold-rolled steel sheet at the end, where the arithmetic mean roughness Ra of a roller surface in a final pass of the last cold-rolling at the cutting wavelength Xc = 20 μm is 0.2 μm or less.
    类似技术:
    公开号 | 公开日 | 专利标题
    BR112017003067B1|2021-08-17|UNORIENTED ELECTRIC STEEL SHEET AND MANUFACTURING METHOD
    RU2569273C1|2015-11-20|Texture electric steel sheet and method of its production
    BR112013001755B1|2019-03-26|ORIENTED GRAIN ELECTRIC STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME.
    JP6194866B2|2017-09-13|Non-oriented electrical steel sheet and manufacturing method thereof
    RU2593243C1|2016-08-10|Method for making unoriented electromagnetic steel sheet
    BR112017014286B1|2021-05-04|unoriented electrical steel sheet and method for producing it
    BR112015020187B1|2019-11-05|Production method of electric grain oriented steel sheets
    BR112019017229A2|2020-04-28|non-oriented electric steel sheet and non-oriented electric sheet steel fabrication method
    BR112013007330B1|2020-02-04|grain oriented electrical steel sheet
    US10629346B2|2020-04-21|Method of manufacturing grain-oriented electrical steel sheet
    JP4855225B2|2012-01-18|Non-oriented electrical steel sheet with small anisotropy
    BR112016013844B1|2020-12-15|NON-DIRECTIONAL ELECTROMAGNETIC STEEL PLATE THAT HAS EXCELLENT MAGNETIC PROPERTIES
    BR112016003108B1|2021-03-02|non-oriented electric steel sheet and hot-rolled steel sheet of the same
    RU2736566C2|2020-11-18|Hot-rolled steel sheet for textured electrical steel sheet and method of manufacturing thereof and method for manufacturing of textured electrical steel sheet
    JP6556135B2|2019-08-07|Method for producing grain-oriented silicon steel with improved forsterite coating properties
    BR112017017403B1|2021-03-09|grain-oriented electric steel plate and method for producing the same
    BR112019019392A2|2020-05-05|electrical steel sheet not oriented
    KR20200103090A|2020-09-01|Directional electrical steel sheet and manufacturing method of winding core and core of transformer using the same
    JP2017133086A|2017-08-03|Manufacturing method of oriented electromagnetic steel sheet
    JP6828820B2|2021-02-10|Manufacturing method of grain-oriented electrical steel sheet and grain-oriented electrical steel sheet
    JP6519006B2|2019-05-29|Unidirectional electrical steel sheet, decarburizing plate for unidirectional electrical steel sheet, and method for producing them
    BR112019019901A2|2020-04-22|electric steel sheet not oriented
    BR102012017451A2|2015-08-25|Cold rolled steel sheet having excellent bending capacity and production method
    JP4905374B2|2012-03-28|Unidirectional electrical steel sheet and manufacturing method thereof
    JP6903996B2|2021-07-14|Non-oriented electrical steel sheet
    同族专利:
    公开号 | 公开日
    EP3187611A1|2017-07-05|
    JP2016047942A|2016-04-07|
    EP3187611B1|2019-01-09|
    KR20170036047A|2017-03-31|
    MX2017002415A|2017-05-23|
    TW201610179A|2016-03-16|
    CN106574346B|2019-01-04|
    WO2016031178A1|2016-03-03|
    EP3187611A4|2017-07-19|
    TWI572723B|2017-03-01|
    US20170274432A1|2017-09-28|
    JP5975076B2|2016-08-23|
    CN106574346A|2017-04-19|
    KR101921008B1|2018-11-21|
    BR112017003067A2|2017-11-21|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JP4269350B2|1998-04-10|2009-05-27|Ｊｆｅスチール株式会社|Method for producing high silicon steel sheet|
    JP2000080450A|1998-09-03|2000-03-21|Sumitomo Metal Ind Ltd|Nonoriented silicon steel sheet excellent in magnetic property and occupying volume rate in non-sine wave excitation and its production|
    JP3791226B2|1999-02-09|2006-06-28|住友金属工業株式会社|Non-oriented electrical steel sheet and manufacturing method thereof|
    JP3490048B2|1999-08-30|2004-01-26|新日本製鐵株式会社|Manufacturing method of non-oriented electrical steel sheet|
    JP2001073094A|1999-08-31|2001-03-21|Sumitomo Metal Ind Ltd|Nonoriented silicon steel sheet for electric car, and its manufacture|
    JP2001073096A|1999-09-01|2001-03-21|Sumitomo Metal Ind Ltd|Nonoriented silicon steel sheet for power steering motor, and its manufacture|
    JP2001192788A|2000-01-12|2001-07-17|Sumitomo Metal Ind Ltd|Nonoriented silicon steel sheet excellent in workability, and its manufacturing method|
    JP2001279403A|2000-03-31|2001-10-10|Kawasaki Steel Corp|Nonoriented silicon steel sheet excellent in high frequency magnetic property|
    JP3308518B2|2000-04-11|2002-07-29|新日本製鐵株式会社|Thin non-oriented electrical steel sheet for high frequency use with low anisotropy and excellent surface properties and method for producing the same|
    JP2001323347A|2000-05-15|2001-11-22|Kawasaki Steel Corp|Nonoriented silicon steel sheet excellent in workability, recyclability and magnetic property after strain relieving annealing|
    JP4265508B2|2004-08-31|2009-05-20|住友金属工業株式会社|Non-oriented electrical steel sheet for rotor and manufacturing method thereof|
    JP5228563B2|2008-03-25|2013-07-03|Ｊｆｅスチール株式会社|Method for producing grain-oriented electrical steel sheet|
    WO2012141206A1|2011-04-13|2012-10-18|新日本製鐵株式会社|High-strength non-oriented magnetic steel sheet|
    EP2762591B1|2011-09-27|2020-02-26|JFE Steel Corporation|Non-grain oriented electrical steel|
    JP5974671B2|2011-11-09|2016-08-23|Ｊｆｅスチール株式会社|Ultra-thin electrical steel sheet|
    US8840734B2|2012-02-14|2014-09-23|Nippon Steel & Sumitomo Metal Corporation|Non-oriented electrical steel sheet|
    CN103834858B|2012-11-23|2016-10-05|宝山钢铁股份有限公司|A kind of manufacture method of low iron loss non-orientation silicon steel|KR101892231B1|2016-12-19|2018-08-27|주식회사 포스코|Non-oriented electrical steel sheet and method for manufacturing the same|
    KR101879103B1|2016-12-23|2018-07-16|주식회사 포스코|Method for manufacturing hot-rolled steel sheet for electrical steel sheet|
    JP6624393B2|2016-12-28|2019-12-25|Ｊｆｅスチール株式会社|Non-oriented electrical steel sheet with excellent recyclability|
    JP6903996B2|2017-03-28|2021-07-14|日本製鉄株式会社|Non-oriented electrical steel sheet|
    US20200063234A1|2017-05-12|2020-02-27|Jfe Steel Corporation|Grain-oriented electrical steel sheet and method for producing the same|
    JP6828814B2|2017-06-02|2021-02-10|日本製鉄株式会社|Non-oriented electrical steel sheet|
    EP3633054A4|2017-06-02|2020-10-21|Nippon Steel Corporation|Non-oriented electromagnetic steel sheet|
    EP3633056A4|2017-06-02|2020-09-30|Nippon Steel Corporation|Non-oriented electromagnetic steel sheet|
    KR102043289B1|2017-12-26|2019-11-12|주식회사 포스코|Non-oriented electrical steel sheet and method for manufacturing the same|
    KR102106409B1|2018-07-18|2020-05-04|주식회사 포스코|Non-oriented electrical steel sheet and method for manufacturing the same|
    WO2020149340A1|2019-01-16|2020-07-23|日本製鉄株式会社|Grain-oriented electrical steel sheet and method for manufacturing same|
    JP7001210B1|2020-04-16|2022-01-19|日本製鉄株式会社|Non-oriented electrical steel sheet and its manufacturing method|
    法律状态:
    2019-08-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-02-17| B07A| Application suspended after technical examination (opinion) [chapter 7.1 patent gazette]|
    2021-06-29| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-08-17| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 18/08/2015, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014-172993|2014-08-27|
    JP2014172993A|JP5975076B2|2014-08-27|2014-08-27|Non-oriented electrical steel sheet and manufacturing method thereof|
    PCT/JP2015/004104|WO2016031178A1|2014-08-27|2015-08-18|Non-oriented electrical steel sheet and manufacturing method thereof|
    [返回顶部]