WO2022148468A1 - 一种低磁致伸缩取向硅钢及其制造方法 - Google Patents
一种低磁致伸缩取向硅钢及其制造方法 Download PDFInfo
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- WO2022148468A1 WO2022148468A1 PCT/CN2022/071200 CN2022071200W WO2022148468A1 WO 2022148468 A1 WO2022148468 A1 WO 2022148468A1 CN 2022071200 W CN2022071200 W CN 2022071200W WO 2022148468 A1 WO2022148468 A1 WO 2022148468A1
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- silicon steel
- insulating coating
- manufacturing
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- steel substrate
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- QQFLQYOOQVLGTQ-UHFFFAOYSA-L magnesium;dihydrogen phosphate Chemical compound [Mg+2].OP(O)([O-])=O.OP(O)([O-])=O QQFLQYOOQVLGTQ-UHFFFAOYSA-L 0.000 claims description 3
- 229910000401 monomagnesium phosphate Inorganic materials 0.000 claims description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 12
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- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 4
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- GGCODHFSTOPWDL-UHFFFAOYSA-I P(=O)([O-])([O-])[O-].[Mg+2].P(=O)([O-])([O-])O.[Al+3] Chemical compound P(=O)([O-])([O-])[O-].[Mg+2].P(=O)([O-])([O-])O.[Al+3] GGCODHFSTOPWDL-UHFFFAOYSA-I 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/02—Magnetic
Definitions
- the invention relates to a steel material and a manufacturing method thereof, in particular to a low magnetostrictive oriented silicon steel and a manufacturing method thereof.
- the existing transformer cores are generally made of oriented silicon steel laminations or oriented silicon steel windings.
- the transformer indicators that the companies that produce transformers mainly focus on are no-load loss characteristics and no-load excitation current characteristics, which correspond to the loss and excitation power characteristics of grain-oriented silicon steel, respectively.
- the noise performance of transformers has become the main indicator as important as no-load loss, which corresponds to the magnetostrictive properties of grain-oriented silicon steel. It should be noted that, during AC excitation, the process of the size change of the oriented silicon steel finished plate with the magnetization is called magnetostriction, which is one of the main sources of transformer noise.
- the magnetostriction mechanism of oriented silicon steel is due to the change and rotation of the number of 90° magnetic domains deviating from the easy magnetization direction during the magnetization process.
- the ideal state of the grain-oriented silicon steel product is only 180° magnetic domain, and the actual grain-oriented silicon steel product is due to the deviation of orientation, inclusions, grain boundaries and other defects, in order to reduce the magnetostatic energy, there is a small additional domain between the 180° magnetic domains - willow leaf domain (90° domains). Therefore, magnetostriction can be effectively reduced by reducing 90° domains (closed domains).
- the currently mainly used methods for reducing magnetostriction mainly include: (1) increasing the orientation degree of the ⁇ 001> crystal plane of the finished crystal grains to reduce the magnetostriction; (2) reducing the thickness of the finished product to reduce the Magnetostriction; (3) Increase coating tension to reduce magnetostriction.
- the publication number is CN107210109A
- the publication date is September 27, 2017,
- the Chinese patent document entitled "Oriented Electrical Steel Sheet and Its Manufacturing Method and Prediction Method of Transformer Noise Characteristics” discloses a grain-oriented electrical steel sheet and its manufacture Methods and methods for predicting the noise characteristics of transformers.
- the patent discloses a technical solution in which the surface-back tension difference of the forsterite coating is controlled to be more than 0.5 MPa and the total surface-back tension difference between the forsterite and the insulating coating is less than 0.5 MPa,
- the speed level of magnetostriction acceleration or deceleration points at d ⁇ /dt are set to 4 in one period of magnetostrictive vibration, and the adjacent speeds in the acceleration region or deceleration region of magnetostrictive vibration are set.
- the speed level change amount of the change point was set to be 3.0 ⁇ 10 4 seconds or less, and the reduction of the magnetostrictive characteristics was realized.
- the publication number is CN106460111A, the publication date is February 22, 2017, and the Chinese patent document titled "low iron loss and low magnetostrictive grain-oriented electrical steel sheet” discloses a low iron loss and low magnetostriction.
- Grain-oriented electrical steel sheet The grain-oriented electrical steel sheet of the present invention has a steel sheet base material, a primary coating formed on the surface of the steel sheet base material, and a tensile insulating coating formed on the surface of the primary coating, and the coating satisfies the following conditions: the tensile insulating coating is controlled.
- the magnetic domain control is performed by irradiating laser light from the above-mentioned tension insulating film.
- a strip-shaped sample having a length of 300 mm in a direction parallel to the rolling direction of the grain-oriented electrical steel sheet and a length of 60 mm in a direction parallel to the sheet width direction was taken from the grain-oriented electrical steel sheet.
- the publication number is CN106029917A, the date of publication is October 12, 2016, and the Chinese patent document entitled "Oriented electrical steel sheet for low-noise transformer and its manufacturing method" discloses a grain-oriented electrical steel sheet, which is used in the same rolling process.
- a grain-oriented electrical steel sheet obtained by irradiating an electron beam with a beam diameter d of 0.40 mm or less in a line region in a direction intersecting the direction of the production direction and subjecting the surface of the steel sheet to a magnetic domain refining treatment, wherein repeating units are formed by connecting repeating units in the line region direction.
- the period of the repeating unit in the modulated irradiation line region is set to 2/3 ⁇ d ⁇ 2.5 ⁇ dmm, and the repetition interval of the modulated irradiation line region in the rolling direction is set to 4.0 ⁇ 12.5mm,
- the intensity of the electron beam is set to be equal to or higher than the intensity capable of forming divided magnetic domains elongated in the direction of the modulated irradiation line region at least on the irradiation surface side, and no coating damage occurs and no plastic strain region is formed on the irradiation surface side.
- the present invention solves the problem of uneven stress distribution caused by single-sided laser scoring in the existing grain-oriented silicon steel, which causes the steel plate to bend toward the scoring surface, and causes the magnetostrictive deviation of the scoring surface and the non-scoring surface of the grain-oriented silicon steel to be too large. The problem.
- the present invention provides a method for manufacturing low magnetostriction oriented silicon steel, the oriented silicon steel includes a silicon steel substrate and an insulating coating on the surface thereof, and the manufacturing method includes: performing single-sided laser etching on the silicon steel substrate , the side of the silicon steel substrate that is subjected to single-sided laser etching is the first surface, and the side opposite to the first surface is the second surface; The difference determines the difference in the amount of insulating coating on the first surface and the second surface; the insulating coating is formed on the first surface and the second surface, so that the amount of insulating coating on the second surface is greater than that on the first surface and the amount of insulating coating on the first surface and the second surface satisfies the difference in the amount of insulating coating.
- the deflection of the first surface and the second surface of the silicon steel substrate can be determined according to the power of laser etching (representing the distance from the center of the curved back end surface of the steel plate to the original axis), and then according to This difference in deflection results in a difference in the coating amount of the insulating coating applied to the first surface and the second surface.
- an insulating coating is applied on the first surface and the second surface, so that by adjusting the tension difference of the insulating coating on the first surface and the second surface, the finished product of oriented silicon steel is reduced due to single-sided
- the difference in deflection between the first surface and the second surface caused by the laser etching reduces the magnetostrictive deviation of the first surface and the second surface.
- Single-sided laser etching is a common practice in the prior art to refine the magnetic domains of oriented silicon steel and reduce losses.
- the method for forming the insulating coating is: coating the insulating coating liquid on the first surface and the second surface, and baking and sintering the insulating coating liquid to form the insulating coating on the first surface and the second surface .
- the steps of baking and sintering the insulating coating liquid can be performed according to the prior art.
- the power of laser etching is controlled so that the obtained oriented silicon steel exhibits a magnetostrictive velocity sound pressure level of ⁇ 55db(A).
- the power of the laser etching is 0.5-2.5 mJ/mm 2 , so as to achieve the purpose of reducing the noise of the transformer core prepared from oriented silicon steel during operation.
- the power of the laser etching is 1-2 mJ/mm 2 , which can further reduce the noise of the transformer core prepared from the oriented silicon steel of the present invention during operation.
- the deflection difference is determined based on the following formula:
- W is the power of single-sided laser etching, and the unit is mJ/mm 2 .
- the unit of deflection difference is mm.
- the insulating coating amount difference is determined based on the following formula:
- Insulation coating amount difference 3 ⁇ 10 -5 -0.407 ⁇ deflection difference
- the unit of the coating amount difference of the coating insulating layer is g/m 2 .
- the amount of the insulating coating on the first surface is 4.0 ⁇ 4.5 g/m 2 .
- the thickness of the insulating coating is too thin, the tension imparted by the insulating coating to the substrate is small, and the magnetic optimization is insufficient.
- the thickness of the insulating coating is too thick, which will affect the lamination coefficient of the finished product, and at the same time, defects such as powder drop and white edge may easily occur during the shearing process.
- the thickness H of the silicon steel substrate is: 0.18mm ⁇ H ⁇ 0.23mm.
- the thickness of the finished oriented silicon steel substrate is greater than or equal to 0.18mm; when the thickness of the substrate is greater than 0.23mm, the stiffness becomes stronger due to the thicker thickness, and the sensitivity to uneven stress distribution caused by laser etching becomes weaker after the insulating coating is formed on the surface.
- the deflection difference caused by the uneven distribution of stress caused by etching becomes smaller and cannot be applied to the above empirical formula.
- the components of the insulating coating liquid are calculated by mass percentage: at least one of aluminum dihydrogen phosphate and magnesium dihydrogen phosphate: 2% to 25%, colloidal silicon dioxide: 4% to 16%, chromic anhydride: 0.15% ⁇ 4.50%, the balance is water and other unavoidable impurities.
- the insulating coating is used to improve the insulating properties of the surface of the silicon steel substrate.
- the insulating coating solution widely used in the prior art is an aqueous solution mainly composed of chromic anhydride, colloidal SiO 2 and phosphates of Mg and Al.
- the silicon steel substrate is prepared by the following steps according to the prior art: step a, smelting and casting; step b, heating; step c, normalization; step d, cold rolling; step e, decarburization annealing; Step f, finished product annealing; Step g, thermal stretching annealing.
- the silicon steel substrate is subjected to a two-stage normalization treatment: firstly heating to 1100-1200°C, then cooling to 900-1000°C at a cooling rate of 1°C/s-10°C/s; Cool to room temperature at a cooling rate of 10°C/s to 70°C/s.
- the cold rolling adopts a primary cold rolling or a secondary cold rolling with an intermediate annealing step.
- a recrystallization annealing is performed at 800-900° C., and then the surface of the silicon steel substrate is coated with an annealing separator.
- an annealing separator such as magnesium oxide, needs to be coated on the surface of the silicon steel substrate before annealing the high-temperature finished product to prevent the steel plates from sticking to each other at high temperature.
- the annealing temperature is controlled to be 1100-1200° C., and the holding time is 20-30 h.
- the silicon steel substrate is first heated to 800-900°C, kept for 10-30s, and then cooled to room temperature at a cooling rate of 5°C/s-50°C/s.
- the present invention provides a low magnetostriction oriented silicon steel, the magnetostriction deviation between the scored surface and the non-scored surface of the oriented silicon steel is small, and the oriented silicon steel has a good average magnetostriction.
- the iron core made of the low magnetostrictive oriented silicon steel of the present invention generates little vibration, so that the overall noise level of the transformer with such an iron core is low.
- the present invention proposes a low magnetostriction oriented silicon steel, which is prepared by the above-mentioned manufacturing method of low magnetostriction oriented silicon steel, and the magnetostriction deviation of the first surface and the second surface of the oriented silicon steel is ⁇ 2db(A), and the average magnetostriction of grain-oriented silicon steel ⁇ 55db(A).
- the low magnetostrictive oriented silicon steel of the present invention Compared with the prior art, the low magnetostrictive oriented silicon steel of the present invention and the manufacturing method thereof have the following advantages and beneficial effects:
- the difference in the amount of insulating coating between the first surface and the second surface can be obtained according to the deflection difference between the scored surface and the non-scored surface of the steel sheet after scoring, so as to adjust the scoring surface (first surface) and the insulating coating tension on the non-scoring surface (second surface), thereby reducing the magnetostrictive deviation between the scoring and non-scoring surfaces.
- the prepared low magnetostriction oriented silicon steel can realize that the magnetostriction deviation of the scored surface and the non-scored surface of the oriented silicon steel is less than or equal to 2db(A), and the average magnetostriction is less than or equal to 55db(A).
- Cores made of strain-oriented silicon steel produce low vibrations, resulting in low overall noise levels for transformers with such cores.
- Fig. 1 shows the curve of the magnetostriction of the score surface of the grain-oriented silicon steel of the present invention as a function of laser score energy density
- FIG. 2 shows the curve of the difference in deflection between the first surface and the second surface of the silicon steel substrate as a function of laser incision energy density after single-side laser etching is performed on the silicon steel substrate of the present invention.
- FIG. 3 shows the difference in the amount of insulating coating on the first surface and the second surface required to maintain the straightness of the silicon steel substrate of the present invention under the condition of different deflection differences.
- the silicon steel substrates of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4 were prepared by the following steps:
- Smelting and casting Smelting was carried out according to the chemical composition shown in Table 1, and cast into slabs.
- Heating heated to 1200 ⁇ 1280°C, kept for 1 ⁇ 4h, and hot rolled into strip steel.
- Two-stage normalization treatment is adopted, firstly heated to 1100 ⁇ 1200°C, then cooled to 900 ⁇ 1000°C at a cooling rate of 1°C/s ⁇ 10°C/s; s cooling rate to room temperature.
- Cold Rolling Either primary cold rolling or secondary cold rolling with an intermediate annealing step.
- Decarburization annealing perform a recrystallization annealing at a temperature of 800-900 °C, and then apply an annealing separator.
- Finished annealing annealing temperature 1100 ⁇ 1200 °C, heat preservation 20-30hr.
- Thermal stretching annealing first heat to 800-900°C, hold for 10-30s, and then cool down to room temperature at a cooling rate of 5°C/s-50°C/s to obtain a silicon steel substrate.
- Table 1 lists the mass percentage of each chemical element and the thickness of the finished product in the oriented silicon steels with low noise characteristics of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4, and the balance of chemical components of the silicon steel substrates in the following examples For Fe and other inevitable impurities.
- the deflection difference between the first surface and the second surface is determined based on the power of the laser etching, and the amount of insulating coating is determined based on the deflection difference. poor; then an insulating coating is formed on the first surface and the second surface to obtain an oriented silicon steel.
- the amount of coating on the surface of the silicon steel substrate needs to meet: the amount of insulating coating on the second surface is greater than the amount of insulating coating on the first surface, and the amount of insulating coating on the first surface and the second surface satisfies the difference in the amount of insulating coating .
- the specific chemical components of the insulating coating liquids applied to the grain-oriented silicon steels of Examples 1-6 of the present invention and the comparative steel sheets of Comparative Examples 1-4 may be, in mass percentage, at least one of aluminum dihydrogen phosphate or magnesium dihydrogen phosphate. Species: 2% to 25%; colloidal silica: 4% to 16%; chromic anhydride: 0.15% to 4.50%; the rest is water and other inevitable impurities.
- Table 2 lists the specific chemical components of the insulating coating liquids coated on the surfaces of the silicon-based steel sheets of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4.
- Example 1 Numbering Aluminum Dihydrogen Phosphate Magnesium Dihydrogen Phosphate Colloidal silica Chromic anhydride Example 1 2% 0 4% 0.15% Example 2 0 2% 8% 1% Example 3 4% 4% 10% 2% Example 4 8% 8% 14% 3% Example 5 25% 0 16% 4% Example 6 0 25% 16% 4.5% Comparative Example 1 12% 0 16% 4.5% Comparative Example 2 0 8% 10% 2% Comparative Example 3 10% 10% 15% 3% Comparative Example 4 10% 5% 15% 2%
- Table 3-1 lists the specific parameters of the manufacturing process of the silicon-based steel sheets of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4.
- Table 3-2 lists the power of single-side laser etching for the silicon-based steel sheets of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4, the deflection difference of the finally obtained oriented silicon steel, and the amount of insulating coating on the surface As well as the poor amount of insulating coating on both surfaces.
- the method can refer to IEC (International Electrotechnical Commission) technical report-IEC/TP 62581. After measurement, the obtained magnetostrictive performance test results of each embodiment and comparative example are listed in Table 4.
- Table 4 lists the performance test results of the low-noise characteristic oriented silicon steels of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4.
- the three-phase transformers of 240KVA were respectively obtained by using the grain-oriented silicon steels of the above-mentioned examples 1-6 and the comparative steel sheets of the comparative examples 1-4, and the three-phase transformers of the respective examples and comparative examples were prepared at 50Hz. , 1.7T magnetization conditions for noise detection (GB/T 1094.10-2003), and the obtained test results are listed in Table 5.
- Table 5 lists the noise test results of the 240KVA three-phase transformers made from the low-noise characteristic oriented silicon steels of Examples 1-6 and the comparative steel sheets of Comparative Examples 1-4.
- the magnetostriction deviations of the first surface and the second surface of the grain-oriented silicon steels of Examples 1-6 are both ⁇ 2db(A), and the average magnetostriction thereof is ⁇ 55db(A). Furthermore, as shown in Table 5, compared with Comparative Examples 1-4, the overall noise level of the 240KVA three-phase transformer made by using the low-noise characteristic oriented silicon steel of Examples 1-6 is significantly lower.
- Fig. 1 shows the curve of the magnetostriction of the grain-oriented silicon steel of the present invention as a function of the laser indentation energy density, and the shaded part corresponds to the corresponding properties of the grain-oriented silicon steel in Examples 2-4. It can be seen that with the increase of laser scribing energy density, the improvement of magnetic properties first increases and then tends to be stable, and the magnetostrictive properties first decrease and then increase.
- Fig. 2 shows the curve of the deflection difference between the first surface and the second surface of the silicon steel substrate as a function of the laser indentation energy density after single-sided laser etching is performed on the silicon steel substrate of the present invention, and the shaded part corresponds to the silicon steel in Examples 2-4 Corresponding properties of the substrate. It can be seen that with the increase of the laser etching energy density, the deflection difference between the first surface and the second surface of the silicon steel substrate increases exponentially at first, and then tends to be stable.
- Fig. 3 shows the difference in the amount of insulating coating between the first surface and the second surface required to keep the silicon steel substrate flat when the deflection difference between the first surface and the second surface is different, and the shaded part corresponds to Example 2 Corresponding properties of silicon steel substrates in -4. It can be seen that in order to maintain the straightness of the oriented silicon steel product and reduce the magnetostrictive deviation on both sides, it is necessary to adjust the difference in the coating amount of the insulating coating on the first surface and the second surface according to the deflection difference caused by laser etching.
- the manufacturing method of the low magnetostrictive oriented silicon steel in the present invention can adjust the score surface and the non-scoring surface according to the difference in deflection value between the score surface and the non-scoring surface of the silicon steel substrate after single-sided laser etching.
- the poor tension of the insulating coating reduces the magnetostrictive deviation of the scored and non-scored surfaces of the oriented silicon steel.
- the low magnetostriction oriented silicon steel prepared by the above manufacturing method can realize the magnetostrictive deviation of the scored surface and the non-scored surface of the oriented silicon steel ⁇ 2db(A), and the average magnetostriction ⁇ 55db(A).
- Cores made of strain-oriented silicon steel produce low vibrations, resulting in low overall noise levels for transformers with such cores.
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Abstract
Description
编号 | 磷酸二氢铝 | 磷酸二氢镁 | 胶体二氧化硅 | 铬酸酐 |
实施例1 | 2% | 0 | 4% | 0.15% |
实施例2 | 0 | 2% | 8% | 1% |
实施例3 | 4% | 4% | 10% | 2% |
实施例4 | 8% | 8% | 14% | 3% |
实施例5 | 25% | 0 | 16% | 4% |
实施例6 | 0 | 25% | 16% | 4.5% |
对比例1 | 12% | 0 | 16% | 4.5% |
对比例2 | 0 | 8% | 10% | 2% |
对比例3 | 10% | 10% | 15% | 3% |
对比例4 | 10% | 5% | 15% | 2% |
编号 | 噪音 |
db(A) | |
实施例1 | 54.5 |
实施例2 | 54 |
实施例3 | 54.3 |
实施例4 | 55.9 |
实施例5 | 56 |
实施例6 | 56.2 |
对比例1 | 58.5 |
对比例2 | 60.6 |
对比例3 | 60.2 |
对比例4 | 60.4 |
Claims (12)
- 一种低磁致伸缩取向硅钢的制造方法,所述取向硅钢包括硅钢基板和所述硅钢基板表面的绝缘涂层,其特征在于,所述制造方法包括:对所述硅钢基板进行单面激光刻蚀,所述硅钢基板中进行所述单面激光刻蚀的一面为第一表面,与所述第一表面相对设置的一面为第二表面;基于所述激光刻蚀的功率确定所述第一表面和所述第二表面的挠度差,基于所述挠度差确定所述第一表面和所述第二表面上的绝缘涂层量差;在所述第一表面和所述第二表面上形成所述绝缘涂层,所述第二表面上的绝缘涂层量大于所述第一表面上的绝缘涂层量,且所述第一表面和所述第二表面上的绝缘涂层量满足所述绝缘涂层量差。
- 如权利要求1所述的制造方法,其特征在于,形成绝缘涂层的方法为:在所述第一表面和所述第二表面上涂覆绝缘涂液,对所述绝缘涂液进行烘烤和烧结,以在所述第一表面和所述第二表面上形成绝缘涂层。
- 如权利要求1所述的制造方法,其特征在于,所述激光刻蚀的功率为0.5~2.5mJ/mm 2。
- 如权利要求3所述的制造方法,其特征在于,所述激光刻蚀的功率为1~2mJ/mm 2。
- 如权利要求1所述的制造方法,其特征在于,基于下述公式确定所述挠度差:挠度差=5.38-5.41×e -W/1.02其中,W为所述激光刻蚀的功率,单位为mJ/mm 2,所述挠度差的单位为mm。
- 如权利要求5所述的制造方法,其特征在于,基于下述公式确定所述绝缘涂层量差:绝缘涂层量差=3×10 -5-0.407×挠度差所述绝缘涂层量差的单位为g/m 2。
- 如权利要求1所述的制造方法,其特征在于,所述第一表面上的绝缘涂层量为4.0~4.5g/m 2。
- 如权利要求1所述的制造方法,其特征在于,所述硅钢基板的厚度H为:0.18mm≤H≤0.23mm。
- 如权利要求2所述的制造方法,其特征在于,以质量百分比计,所述绝缘涂液的组分为:磷酸二氢铝、磷酸二氢镁中的至少一种:2%~25%;胶体二氧化硅:4%~16%;铬酸酐:0.15%~4.50%;余量为水及其他不可避免的杂质。
- 如权利要求1所述的制造方法,其特征在于,所述硅钢基板依次采用下述步骤而制得:步骤a、冶炼和铸造;步骤b、加热;步骤c、常化;步骤d、冷轧;步骤e、脱碳退火;步骤f、成品退火;步骤g、热拉伸退火。
- 如权利要求10所述的制造方法,其特征在于,所述制造方法满足下述制造工艺中的至少一项:在所述步骤c中,对所述硅钢基板采用两段式常化处理:首先将所述硅钢基板加热到1100~1200℃,然后以1℃/s~10℃/s的冷却速度降温到900~1000℃;再以10℃/s~70℃/s的冷却速度冷却到室温;在所述步骤d中,采用一次冷轧或带中间退火步骤的二次冷轧;在所述步骤e中,在800~900℃进行一次再结晶退火,然后在所述硅钢基板的表面涂覆退火隔离剂;在所述步骤f中,控制退火温度为1100~1200℃,保温时间为20~30h;在所述步骤g中,首先将所述硅钢基板加热到800~900℃,保温10~30s,然后以5℃/s~50℃/s的冷却速度冷却至室温。
- 一种低磁致伸缩取向硅钢,其特征在于,采用如权利要求1-11中任意一项所述的制造方法制得,所述第一表面和所述第二表面的磁致伸缩偏差≤2db(A),所述取向硅钢的平均磁致伸缩≤55db(A)。
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