Grain-oriented electrical steel sheet and method for producing grain-oriented electrical steel sheet

Abstract

This grain-oriented electrical steel sheet has a magnetic domain control processing line on the surface thereof, and satisfies [alpha] All-[alpha] Dr > = 0.1 DEG, [alpha] All being the average value of the absolute values of the [alpha] angle throughout the entire surface of the grain-oriented electrical steel sheet, and [alpha] Dr being the average value of the absolute values of the [alpha] angle throughout the entire surface thereof. And [alpha] Dr is the average value of the absolute values of [alpha] angles at magnetic domain control points, which are the intersections between a plurality of virtual lines set parallel to the rolling direction of the grain-oriented electrical steel sheet at intervals of 2 mm and the magnetic domain control processing line. A method for manufacturing a grain-oriented electrical steel sheet according to another embodiment of the present disclosure comprises: a step for measuring the distribution of alpha angles on the surface of a base sheet of a grain-oriented electrical steel sheet; a step for specifying a region in which the absolute value of the alpha angle is 5 DEG or less; and a step for applying a magnetic domain control process to a region in which the absolute value of the alpha angle is 5 DEG or less.

Description

Technical Field

[0001] This invention relates to oriented electromagnetic steel sheets and methods for manufacturing oriented electromagnetic steel sheets.

[0002] This invention claims priority based on Japanese Patent Application No. 2023-166173, filed on September 27, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] Oriented electromagnetic steel sheets contain less than 7% by mass of Si and have secondary recrystallized grains along the easily magnetized axis. <001> {110} oriented in the rolling direction <001> Oriented (Goss orientation) steel sheets with a secondary recrystallization texture. Oriented electromagnetic steel sheets are mainly used as the cores of power transformers. For oriented electromagnetic steel sheets, it is required to reduce energy loss (iron loss).

[0004] To reduce iron loss, techniques for narrowing the domain width of oriented electromagnetic steel sheets (domain subdivision technology based on domain control processing) are previously known. Domain width can be narrowed by inducing thermal strain by irradiating the surface of the oriented electromagnetic steel sheet with a laser or electron beam in a direction intersecting the rolling direction. Alternatively, domain width can also be narrowed by forming grooves on the surface of the oriented electromagnetic steel sheet in a direction intersecting the rolling direction. Methods for forming these grooves include laser or electron beam irradiation, mechanical processing methods such as gear machining, and chemical processing methods such as etching.

[0005] In recent years, in order to provide oriented electromagnetic steel sheets with good iron loss characteristics, various improvement technologies related to magnetic domain subdivision have been proposed (for example, see Patent Documents 1 to 3).

[0006] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2012-57219 Patent Document 2: Japanese Patent Application Publication No. 2012-12664 Patent Document 3: Japanese Patent Application Publication No. 2012-57218 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] When magnetic domain control is applied to oriented electromagnetic steel sheets, the magnetostrictive properties of the sheets change due to the closed magnetic domains. This deteriorates the noise characteristics of the oriented electromagnetic steel sheets. Noise characteristics refer to the level of noise generated by electrical products (such as transformers and motors) manufactured using oriented electromagnetic steel sheets as materials. Magnetostriction refers to the phenomenon of slight deformation of the shape when a strongly magnetic material is magnetized. When oriented electromagnetic steel sheets are excited using alternating current, the magnitude of magnetostriction changes with the intensity of magnetization, thereby generating vibration. The magnitude of this magnetostriction is 10. -6 Although the magnetostriction of the iron core is very small, it causes the core to vibrate, which propagates to external structures such as the transformer tank and becomes noise.

[0009] In other words, while magnetic domain control is effective in suppressing iron losses in oriented electromagnetic steel sheets, it also deteriorates their noise characteristics. In recent years, there has been a growing demand for both low iron losses and low noise levels in oriented electromagnetic steel sheets. However, to date, no magnetic domain subdivision technology has been proposed that can achieve both low noise and low iron losses.

[0010] The purpose of this disclosure is to provide an orientation-oriented electromagnetic steel sheet that achieves both low iron loss and low noise, and a method for manufacturing the same.

[0011] means for solving problems

[0012] The main purpose of this disclosure is as follows.

[0013] (1) One embodiment of the present disclosure is an orientation-oriented electromagnetic steel sheet with magnetic domain control processing lines on its surface, satisfying |α All |-|α Dr |≥0.1°,|α All | is the average absolute value of the angle α across the entire surface of the oriented electromagnetic steel sheet, |α Dr | is the average of the absolute values ​​of the angle α at the intersection points of multiple imaginary lines spaced 2 mm apart parallel to the rolling direction of the oriented electromagnetic steel sheet and the magnetic domain control processing lines, i.e., the magnetic domain control points. (2) Preferably, the oriented electromagnetic steel sheet described in (1) above satisfies |α All |-|α Dr |≥0.2°.

[0014] (3) Preferably, the orientation electromagnetic steel plate described in (1) above satisfies |α All |-|α Dr |≥0.5°.

[0015] (4) Preferably, the orientation-oriented electromagnetic steel plate described in (1) above satisfies |α All |-|α Dr|≥1.0°.

[0016] (5) Preferably, the orientation electromagnetic steel sheet of any one of (1) to (4) above satisfies |γ All |-|α Dr |≥0.1°,|γ All | is the average absolute value of the angle γ across the entire surface of the oriented electromagnetic steel sheet.

[0017] (6) Preferably, the orientation electromagnetic steel sheet described in any one of (1) to (5) above satisfies σα Dr <σα All ,σα All It is the standard deviation of the absolute value of the angle α, which is the entirety of the surface of the oriented electromagnetic steel sheet. Dr It is the standard deviation of the absolute value of the angle α at the domain control point.

[0018] (7) Preferably, in any one of (1) to (6) above, the magnetic domain control processing line is a groove.

[0019] (8) Another aspect of the present disclosure of the method for manufacturing an orientation-oriented electromagnetic steel sheet includes: a step of measuring the distribution of α angle on the surface of the original sheet of the orientation-oriented electromagnetic steel sheet; a step of identifying a region where the absolute value of the α angle is less than 5°; and a step of forming magnetic domain control processing lines in the region where the absolute value of the α angle is less than 5°.

[0020] (9) Preferably, the method for manufacturing the oriented electromagnetic steel sheet described in (8) above applies magnetic domain control processing by irradiation with a laser or electron beam.

[0021] Invention Effects

[0022] According to this disclosure, it is possible to provide an orientation-oriented electromagnetic steel sheet that achieves both low iron loss and low noise, and a method for manufacturing the same. Attached Figure Description

[0023] Figure 1 This is a top view of an orientation-type electromagnetic steel sheet according to one embodiment of the present disclosure.

[0024] Figure 2 This is a top view of a typical oriented electromagnetic steel sheet.

[0025] Figure 3 This is a schematic diagram illustrating an example of the configuration of a laser irradiation device.

[0026] Figure 4 This is a top view of the original sheet of oriented electromagnetic steel.

[0027] Figure 5 It is in |α All |Illustrative diagram of the imaginary lines VL1 and VL2 set during the calculation. Detailed Implementation

[0028] (1. Oriented electromagnetic steel sheet 1)

[0029] The orientation-oriented electromagnetic steel plate 1 of this embodiment has magnetic domain control lines 11 on its surface, satisfying |α All |-|α Dr |≥0.1°。 |α All | is the average absolute value of the angle α across the entire surface of the orientation-oriented electromagnetic steel sheet 1. | α Dr | is the average value of the absolute value of the angle α at the intersection point of multiple imaginary lines VL3 set at 2mm intervals parallel to the rolling direction RD of the oriented electromagnetic steel plate 1 and the magnetic domain control processing line 11, i.e., the magnetic domain control point VP2.

[0030] (Magnetic domain control processing line 11)

[0031] Multiple magnetic domain control lines 11 disposed on the surface of the oriented electromagnetic steel sheet 1 serve to subdivide 180° magnetic domains. By subdividing the magnetic domains, the iron loss of the oriented electromagnetic steel sheet 1 can be reduced. A magnetic domain refers to a collection of magnetic dipoles existing inside a strongly magnetic material, with the magnetic moment aligned along a small region. A 180° magnetic domain refers to a magnetization direction aligned with the crystal structure. <100> A domain is oriented and sandwiched between two 180° domain walls that are approximately parallel to the rolling direction RD. The distance between adjacent domain walls of a 180° domain (domain wall spacing) is called the width of the 180° domain.

[0032] A preferred example of the magnetic domain control processing line 11 is thermal strain and groove. By subdividing the magnetic domains, the iron loss of the orientation-oriented electromagnetic steel sheet 1 can be suppressed. However, the magnetic domain control processing line 11 changes the magnetostrictive properties of the orientation-oriented electromagnetic steel sheet 1 by closing the magnetic domains. As a result, the noise characteristics of the orientation-oriented electromagnetic steel sheet 1 deteriorate.

[0033] The magnetic domain control processing line 11 is formed in a direction intersecting the rolling direction RD of the oriented electromagnetic steel sheet 1. Figure 2 In the typical oriented electromagnetic steel sheet 1 illustrated, the magnetic domain control processing lines 11 are formed across the entire width of the oriented electromagnetic steel sheet 1. However, in cases such as Figure 1 In the orientation-oriented electromagnetic steel sheet 1 of this embodiment, it is not necessary to provide the domain control processing lines 11 throughout the entire width of the orientation-oriented electromagnetic steel sheet 1. At least a portion of the domain control processing lines 11 are interrupted in the region 12B with a large α angle, which will be described later.

[0034] exist Figure 1In the illustrated orientation-oriented electromagnetic steel sheet 1, the domain control processing line 11 is a straight line. However, the domain control processing line 11 can also be curved. The domain control processing line 11 can also have a shape with both straight and curved portions. Furthermore, the domain control processing line 11 can be located on one side or both sides of the orientation-oriented electromagnetic steel sheet 1. When the domain control processing line 11 is located on both sides of the orientation-oriented electromagnetic steel sheet 1, various configurations of the orientation-oriented electromagnetic steel sheet 1 in this embodiment only need to be applied to at least one side of the orientation-oriented electromagnetic steel sheet 1.

[0035] (α angle)

[0036] In the orientation-oriented electromagnetic steel sheet 1 of this embodiment, the value |α| is calculated by measuring the angle α. All | and |α Dr | Satisfies the specified relationship. The α angle refers to the offset angle of the grain relative to the Goss orientation around the axis normal to the rolling surface ND. It is known that controlling the α angle is effective for controlling the magnetic properties of the oriented electromagnetic steel sheet 1. The offset angle of the grain relative to the Goss orientation around the axis perpendicular to the rolling direction TD is called the β angle, and the offset angle of the grain relative to the Goss orientation around the axis perpendicular to the rolling direction RD is called the γ angle.

[0037] The inventors compared the iron loss values ​​before and after domain control treatment of multiple orientation-oriented electromagnetic steel sheets 1 with different α angles. The results showed that when domain control treatment was applied to orientation-oriented electromagnetic steel sheets with small α angles, the reduction in iron loss was greater compared to when it was applied to orientation-oriented electromagnetic steel sheets with large α angles. Before and after domain control treatment, the iron loss changed, but the α angle remained unchanged. The mechanism by which domain control treatment resulted in a greater reduction in iron loss in regions with small α angles is not yet clear, but it is believed that the smaller offset of the easily magnetized axis from the rolling direction and the smaller hysteresis loss in regions with small α angles are beneficial to the reduction of iron loss through domain control treatment.

[0038] On the other hand, it is believed that domain control processing in regions with large α angles and small iron loss reduction effects leads to the deterioration of noise characteristics caused by closed domains.

[0039] Based on the above insights, it is believed that by prioritizing the application of magnetic domain control processing to regions with small α angles, i.e. regions where the reduction in iron loss is significant, both low iron loss and low noise can be achieved.

[0040] (|α) All |-|α Dr |)

[0041] In this embodiment, the orientation-type electromagnetic steel plate 1 satisfies |α All |-|α Dr |≥0.1°。 |α All| is the average absolute value of the angle α across the entire surface of the orientation-oriented electromagnetic steel sheet 1. | α Dr | is an indicator of the α angle in the magnetic domain control processing line 11. Specifically, |α Dr |α is the average of the absolute values ​​of the angle α at the intersection points (magnetic domain control points VP2) of multiple imaginary lines VL3 set parallel to the rolling direction RD of the oriented electromagnetic steel sheet 1 at 2mm intervals. The angle α is obtained by averaging the absolute values ​​of the angle α measured at multiple magnetic domain control points VP2. Dr |。|α All | and |α Dr Details of the determination method for | will be described later.

[0042] In the orientation-oriented electromagnetic steel plate 1, |α All |-|α Dr When the angle is ≥0.1°, the magnetic domain control processing line 11 is preferentially set in the region 12A with a small angle α. Generally, the orientation-oriented electromagnetic steel plate 1 has a region 12A with a small angle α and a region 12B with a large angle α. Figure 1 In the schematically illustrated orientation-type electromagnetic steel sheet 1, magnetic domain control processing lines 11 are preferentially arranged in the region 12A with a small α angle. Therefore, the index of the α angle in the magnetic domain control processing line 11 is |α... Dr |The average value of angle α across the entire surface of the oriented electromagnetic steel sheet 1 is less than the average value of angle α.| All On the other hand, in Figure 2 In the typical orientation-oriented electromagnetic steel sheet 1 shown, the domain control processing lines 11 are arranged without considering the distribution of the α angle. Therefore, the index of the α angle in the domain control processing lines 11 is |α... Dr |Average value of angle α across the entire surface of the orientation-oriented electromagnetic steel sheet 1|α All They are essentially the same value.

[0043] (Basic principles and effects)

[0044] The inventors have discovered that, according to |α All |-|α Dr | ≥ 0.1° orientation of electromagnetic steel sheet 1 can achieve both low iron loss and low noise. This is because, while satisfying | α All |-|α Dr In the orientation-oriented electromagnetic steel plate 1 with an α angle of ≥0.1°, a magnetic domain control processing line 11 is set in the region 12A with a small α angle, that is, the region with a large magnetic domain control effect. On the other hand, magnetic domain control processing is suppressed in the region 12B with a large α angle, that is, the region with a small magnetic domain control effect.

[0045] The most basic embodiment of the orientation-oriented electromagnetic steel sheet 1 has been described above. Further preferred embodiments will now be described.

[0046] (|α) All |-|α Dr |Preferred numerical range)

[0047] |α All |-|α Dr From the perspective of improving noise characteristics, a larger α value is preferable. All |-|α Dr |More preferably, the angle is 0.2° or higher, 0.5° or higher, or 1.0° or higher. That is, it is further preferred that |α| is satisfied. All |-|α Dr |≥0.2°、|α All |-|α Dr |≥0.5° or|α All |-|α Dr |≥1.0°. This results in further improvement in noise characteristics.

[0048] |α All |-|α Dr There is no specific upper limit to |, for example, |α All |-|α Dr | Can be below 5.0°, below 4.0°, or below 3.0°.

[0049] (|γ) All |-|α Dr |Preferred numerical range)

[0050] In this embodiment, the orientation-oriented electromagnetic steel plate 1 preferably satisfies |γ All |-|α Dr |≥0.1°。 |γ All | is the average absolute value of the γ angle across the entire surface of the orientation-oriented electromagnetic steel sheet 1. | γ All The details of the determination method for |γ will be described later. By satisfying |γ All |-|α Dr |≥0.1° can further improve noise characteristics.

[0051] (σα) Dr With σα All (relationship)

[0052] Oriented electromagnetic steel sheet 1 preferably satisfies σα Dr <σα All σα All σα is the standard deviation of the absolute value of the angle α across the entire surface of the orientation-oriented electromagnetic steel sheet 1. DrIt is the standard deviation of the absolute value of the angle α at the intersection point VP2, i.e., the magnetic domain control point, of multiple imaginary lines VL3 set parallel to the rolling direction RD of the oriented electromagnetic steel sheet 1 at 2mm intervals. This angle is given by σα. Dr <σα All In the oriented electromagnetic steel sheet 1, the non-uniformity of the α angle at the domain control point VP2 is smaller than the non-uniformity of the α angle of the entire oriented electromagnetic steel sheet 1. That is, in this case, since the domain control treatment is concentrated in the area where the iron loss reduction effect is large, the noise characteristics can be further improved.

[0053] (Magnetic domain control processing line 11)

[0054] The type of magnetic domain control processing line 11 is not particularly limited, but preferred examples are thermal strain and / or grooves. Thermal strain can be formed, for example, by means of laser irradiation, electron beam irradiation, and ion implantation. Grooves can be formed, for example, by means of laser irradiation, electron beam irradiation, and machining.

[0055] Thermal strain disappears through stress-relief annealing or heat treatment based thereon. Therefore, when the orientation-oriented electromagnetic steel sheet 1 is heat-treated, the domain control processing line 11 is preferably provided as a groove. On the other hand, since thermal strain can be easily formed, the domain control processing line 11 is preferably provided as thermal strain when simplification of the manufacturing process is required. The orientation-oriented electromagnetic steel sheet 1 may also have both thermal strain and groove.

[0056] (2. Manufacturing apparatus for oriented electromagnetic steel sheet 1)

[0057] Next, an example of the manufacturing apparatus for the orientation-oriented electromagnetic steel sheet 1 of this embodiment will be described. However, the manufacturing apparatus described below is merely illustrative. The orientation-oriented electromagnetic steel sheet 1 of this embodiment can be manufactured using any apparatus.

[0058] The method of introducing thermal strain onto the surface of the original plate 2 can be known methods such as laser irradiation, electron beam irradiation, and ion implantation. The method of forming grooves on the surface of the original plate 2 can be known methods such as laser irradiation, electron beam irradiation, and machining. The configuration of the laser irradiation device 500 for introducing thermal strain by laser irradiation will be described below.

[0059] Figure 3 This describes the configuration of the laser irradiation device 500. The laser irradiation device 500 includes a polygon mirror 501, a light source device 503, a collimator 505, a condenser lens 507, a motor 509, a sensor 511, a control unit 513, and a through plate device 515.

[0060] The plate-passing device 515 causes the original plate 2 to pass through in the rolling direction RD.

[0061] The polygon mirror 501 is, for example, a regular polygonal prism. Multiple plane mirrors are respectively provided on multiple sides of the polygon mirror 501 that constitute the regular polygonal prism. The laser beam LB is incident from the light source device 503 through the collimator 505 in one direction (horizontal direction) onto the plane mirror of the polygon mirror 501 and is reflected by the plane mirror.

[0062] The polygon mirror 501 can rotate around the rotation axis O1 driven by the motor 509. Depending on the rotation angle of the polygon mirror 501, the incident angle of the laser beam LB relative to the plane mirror changes sequentially. Therefore, the reflection direction of the laser beam LB changes sequentially, enabling it to scan the surface of the original plate 2. Figure 3 The symbol P represents the interval between adjacent magnetic domain control processing lines 11, that is, the irradiation spacing of the laser beam LB.

[0063] Under the control of the control unit 513, the light source device 503 outputs a laser beam LB in a prescribed irradiation mode (e.g., continuous irradiation mode or pulse irradiation mode).

[0064] A condenser lens 507 is disposed in the optical path of the laser beam LB reflected from the polygon mirror 501. The condenser lens 507 constitutes a condenser optical system with a specified focal length. The laser beam LB reflected from the polygon mirror 501 is focused onto the surface of the original plate 2 by the condenser lens 507, thereby introducing thermal strain onto the surface of the original plate 2.

[0065] Motor 509 is connected to polygon mirror 501. Motor 509 rotates and drives polygon mirror 501 under the control of control unit 513.

[0066] Sensor 511 is connected to the drive shaft of motor 509. Sensor 511 detects the rotation angle of the polygon mirror 501 rotated by motor 509. In addition, sensor 511 outputs a signal indicating the detected rotation angle (hereinafter referred to as rotation angle signal) to control unit 513.

[0067] The control unit 513 is composed of a processor. The control unit 513 is connected to the light source device 503, the motor 509, the sensor 511, and the through-plate device 515. The control unit 513 receives speed signal input from the through-plate device 515. Furthermore, the control unit 513 outputs a signal to the motor 509 instructing the rotation drive of the polygon mirror 501.

[0068] Furthermore, the control unit 513 controls the switching on and off of the power of the laser beam LB output by the light source device 503 based on the stress introduction signal representing the magnetic domain control processing region 21 and the rotation angle signal output from the sensor 511. Based on position data obtained during processes in regions where the absolute value of a specific α angle is less than 5° (described later), a stress introduction signal is input to the laser irradiation device 500.

[0069] (3. Manufacturing method of oriented electromagnetic steel sheet 1)

[0070] Next, the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 according to this embodiment will be described. According to the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 according to this embodiment, the orientation-oriented electromagnetic steel sheet 1 of this embodiment can be suitably manufactured. However, the manufacturing method described below is merely an example of a preferred manufacturing method for the orientation-oriented electromagnetic steel sheet 1 and does not limit the orientation-oriented electromagnetic steel sheet 1. For ease of explanation, the manufacturing apparatus will be appropriately mentioned in the description of the manufacturing method. However, the manufacturing apparatus mentioned below is merely a preferred example for implementing the manufacturing method of the orientation-oriented electromagnetic steel sheet 1 of this embodiment.

[0071] The manufacturing method of the orientation-oriented electromagnetic steel sheet 1 in this embodiment includes: a step of measuring the α angle; a step of measuring a region where the absolute value of the α angle is 5° or less; and a step of applying magnetic domain control processing to the region where the absolute value of the α angle is 5° or less.

[0072] (The procedure for determining the distribution of angle α)

[0073] First, the distribution of the α angle on the surface of the original plate of the orientation-oriented electromagnetic steel sheet 1 was measured. The α angle was measured by the Laue method of side reflection, which will be described later.

[0074] Original plate 2 refers to the orientation electromagnetic steel plate 1 before the application of magnetic domain control treatment.

[0075] (Processes in areas where the absolute value of a specific angle α is less than 5°)

[0076] Next, based on the distribution of the α angle, a region on the surface of the original plate where the absolute value of the α angle is less than 5° is selected. Hereinafter, the region where the absolute value of the α angle is less than 5° is referred to as the magnetic domain control processing region 21.

[0077] (The process of forming the magnetic domain control processing line)

[0078] Figure 4 This is a top view of an example of the original plate 2. Figure 4 The magnetic domain control processing region 21 and the non-magnetic domain control processing region 22 of the original board 2 are shown. Magnetic domain control processing is applied to... Figure 4 The dashed lines shown represent the domain control processing lines. These lines can be formed using known domain control processing methods. When the domain control processing line 11 is subjected to thermal strain, the domain control processing can be performed by irradiation with a laser beam LB based on the laser irradiation device 500, or by other methods such as ion implantation or electron beam irradiation. When the domain control processing line 11 is a groove, the domain control processing can also be performed using tools designed for machining.

[0079] The control unit 513 of the laser irradiation device 500 turns on the power of the laser beam LB for the magnetic domain control processing region 21, and preferably controls it to turn off the power of the laser beam LB for the non-magnetic domain control processing region 22 (i.e., the region other than the magnetic domain control processing region 21). This introduces the magnetic domain control processing line 11 into the magnetic domain control processing region 21 of the original board 2. Furthermore, the introduction of the magnetic domain control processing line 11 into the non-magnetic domain control processing region 22 of the original board 2 is suppressed to a minimum.

[0080] (Effects)

[0081] According to the above manufacturing method, it is possible to manufacture steel plates that achieve both low iron loss and low noise.

[0082] The embodiments of the present invention have been described above, but the present invention is not limited thereto and can be appropriately modified without departing from the technical concept of the invention. Hereinafter, a further preferred example of the orientation-oriented electromagnetic steel sheet 1 and its manufacturing method according to this embodiment will be described. Unless otherwise specified, the preferred embodiments described below can be applied to both the orientation-oriented electromagnetic steel sheet 1 and its manufacturing method. As will be described later, the orientation-oriented electromagnetic steel sheet of this embodiment may have a magnesium olivine coating and / or an insulating coating on the surface of the base steel sheet.

[0083] The following will explain each point separately. However, when the oriented electromagnetic steel sheet has a base steel sheet, a forsterite coating, and / or an insulating coating, the following specifications regarding chemical composition, magnetic domain control treatment lines, magnetic domain control regions, and non-magnetic domain control treatment lines pertain to the base steel sheet. However, the specifications regarding sheet thickness apply to the entire oriented electromagnetic steel sheet, including the base steel sheet, the forsterite coating, and / or the insulating coating.

[0084] (Chemical composition and plate thickness)

[0085] The chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the original sheet 2 is not limited, as long as it is the same as that of the known orientation-oriented electromagnetic steel sheet 1. For example, the chemical composition of the oriented electromagnetic steel plate 1 and the original plate 2, by mass%, can be: Si: 2.500~7.000%, Mn: 0.00~1.000%, C: 0~0.085%, acid-soluble Al: 0~0.065%, N: 0~0.012%, Cr: 0~0.300%, Cu: 0~0.400%, P: 0~0.500%, Sn: 0~0.300%, Sb: 0~0.300%, Ni: 0~1.000%, S: 0~0.015%, Se: 0~0.015%, Bi: 0~0.020%, Nb: 0~0.030%, V: 0~0.030%, Mo: 0~0.030%, Ta: 0~0.030%, W: 0~0.030%, B: 0~0.080%, Ti: 0~0.015%. The balance of the chemical composition includes Fe and impurities.

[0086] The thickness of the oriented electromagnetic steel sheet 1 and the original sheet 2 is not limited, but is preferably 0.15 to 0.30 mm. By setting it to 0.30 mm or less, classical eddy current losses can be suppressed, further improving iron loss. On the other hand, by making the sheet thickness 0.15 mm or more, rolling efficiency can be improved, thus increasing productivity.

[0087] (Surface treatment)

[0088] Oriented electromagnetic steel sheet 1 and base sheet 2 may also have a magnesium olivine coating. Additionally, oriented electromagnetic steel sheet 1 and base sheet 2 may also have an insulating coating. The magnesium olivine coating and the insulating coating may be formed on one side or both sides of the oriented electromagnetic steel sheet 1.

[0089] Forsterite coatings are, for example, inorganic coatings with magnesium silicate as the main component. Forsterite coatings are formed, for example, by reacting an annealing release agent containing magnesium oxide (MgO) applied to the surface of a base steel sheet with the surface composition of the base steel sheet during final annealing. For example, a forsterite coating has a composition derived from the annealing release agent and the base steel sheet (more specifically, a composition with Mg2SiO4 as the main component). On the other hand, when an annealing release agent mainly composed of Al2O3 is used in the final annealing, a forsterite coating sometimes does not form.

[0090] The insulating coating imparts electrical insulation and tensile strength to the oriented electromagnetic steel sheet 1. By applying tension to the oriented electromagnetic steel sheet 1, the movement of magnetic domain walls within the sheet becomes easier, thereby reducing iron loss. Furthermore, the insulating coating can impart various properties to the oriented electromagnetic steel sheet 1, such as corrosion resistance, heat resistance, and slip resistance. The insulating coating can be, for example, a known coating formed by applying a coating solution primarily composed of phosphate and colloidal silica to the surface of a magnesium olivine coating and then sintering it.

[0091] The insulating coating is preferably formed after final annealing and after the magnetic domain control treatment. Alternatively, the insulating coating may be formed after the final annealing process and before the magnetic domain control treatment. In the case where the insulating coating is formed before the magnetic domain control treatment, the insulating coating may sometimes peel off in the magnetic domain control treatment line 11. Therefore, it is preferable to form the insulating coating again on the magnetic domain control treatment line 11 after the magnetic domain control treatment.

[0092] (The angle between the magnetic domain control processing line 11 and the rolling right-angle direction TD)

[0093] The angle between the domain control processing line 11 and the rolling right-angle direction TD is not particularly limited. The domain control processing line 11 and the rolling right-angle direction TD can also be approximately parallel. That is, the angle between the domain control processing line 11 and the rolling right-angle direction TD can also be substantially 0°. On the other hand, as... Figure 1 As illustrated, the angle between the domain control processing line 11 and the rolling right-angle direction TD can also exceed 0°. For example, the angle between the domain control processing line 11 and the rolling right-angle direction TD can be set to any value within the range of 0° to 45°. The angle between the domain control processing line 11 and the rolling right-angle direction TD can also be set to 1° or more, 3° or more, or 5° or more. The angle between the domain control processing line 11 and the rolling right-angle direction TD can also be set to 40° or less, 35° or less, or 30° or less.

[0094] like Figure 1As illustrated, the angles formed by all the domain control processing lines 11 and the rolling right-angle direction TD can be the same. That is, all the domain control processing lines 11 can extend parallel to each other. On the other hand, the angles formed by the domain control processing lines 11 and the rolling right-angle direction TD can be uneven. That is, some or all of the multiple domain control processing lines 11 can extend non-parallel to each other. The average value of the angles formed by the domain control processing lines 11 and the rolling right-angle direction TD can also be set to 1° or more, 3° or more, or 5° or more. The average value of the angles formed by the domain control processing lines 11 and the rolling right-angle direction TD can also be set to 40° or less, 35° or less, or 30° or less. For one domain control processing line, the average value of the angle is calculated by measuring the angles formed by the domain control processing line and the rolling right-angle direction TD at multiple locations, or by measuring the angles formed by multiple domain control processing lines and the rolling right-angle direction TD at one or more locations, and then calculating the average value.

[0095] (The spacing of the magnetic domain control processing line 11 along the rolling direction RD)

[0096] The spacing P of the magnetic domain control processing lines 11 adjacent to each other along the rolling direction RD is not particularly limited. The smaller the spacing P, the better the effect of improving iron loss. On the other hand, the larger the spacing P, the better the noise characteristics. The spacing can be appropriately selected according to the characteristics required by the oriented electromagnetic steel sheet 1. For example, the spacing P of the magnetic domain control processing lines 11 adjacent to each other along the rolling direction RD can be set to 1.0 mm or more, 2.0 mm or more, 3.0 mm or more, or 5.0 mm or more. The spacing P of the magnetic domain control processing lines 11 adjacent to each other along the rolling direction RD can also be set to 10.0 mm or less, 9.0 mm or less, 8.0 mm or less, or 7.0 mm or less.

[0097] exist Figure 1 In the illustrated oriented electromagnetic steel sheet 1, the domain control processing lines 11 are arranged at certain intervals. On the other hand, the interval P along the rolling direction RD of adjacent domain control processing lines 11 may also be uneven. For example, the average value of the interval P along the rolling direction RD of adjacent domain control processing lines 11 may be set to 1.0 mm or more, 2.0 mm or more, 3.0 mm or more, or 5.0 mm or more. The average value of the interval P along the rolling direction RD of adjacent domain control processing lines 11 may also be set to 10.0 mm or less, 9.0 mm or less, 8.0 mm or less, or 7.0 mm or less.

[0098] (The magnitude of the tensile stress introduced in thermal strain)

[0099] The magnetic domain control processing line 11 can also be thermal strain. In thermal strain, tensile stress is introduced. The greater the tensile stress, the better the effect of improving iron loss. On the other hand, the smaller the tensile stress, the better the noise characteristics. The tensile stress can be appropriately selected to correspond to the characteristics required by the oriented electromagnetic steel sheet 1.

[0100] The magnitude of the tensile stress is not particularly limited. For example, in at least a portion of the domain control processing line 11, the tensile stress relative to any direction is preferably 40 MPa or more, 60 MPa or more, or 80 MPa or more. If the tensile stress relative to at least one direction is 40 MPa or more, it is considered to satisfy the requirement of "tensile stress relative to any direction being 40 MPa or more". Furthermore, for example, in at least a portion of the domain control processing line 11, the tensile stress relative to any direction is preferably 300 MPa or less, 200 MPa or less, 180 MPa or less, or 150 MPa or less. The tensile stress relative to any direction in the domain control processing line 11 can be the same or non-uniform.

[0101] (Depth and width of the groove)

[0102] The magnetic domain control processing line 11 can also be a slot. The greater the depth and width of the slot, the better the effect of improving iron loss. On the other hand, the smaller the depth and width of the slot, the better the noise characteristics. The shape of the slot can be appropriately selected to correspond to the characteristics required by the oriented electromagnetic steel sheet 1.

[0103] There is no particular limitation on the depth of the groove; for example, it is preferably set to 5μm to 50μm. The depth of the groove can also be set to 6μm or more, 7μm or more, or 10μm or more. Alternatively, the depth of the groove can be set to less than 48μm, 45μm or less, or 40μm or less.

[0104] The width of the groove (the width of the opening) is not particularly limited; for example, it is preferably set to 10μm to 300μm. The groove width can also be specified as 20μm or more, 30μm or more, or 50μm or more. Alternatively, the groove width can be specified as 280μm or less, 250μm or less, or 200μm or less. The depth and width of the groove can be the same or uneven. In the case of unevenness, it is preferable that the average depth and width of multiple grooves fall within the above-mentioned range.

[0105] (Number of domain control points)

[0106] The more domain control points there are, the more domain control processing lines there are, and the wider the area treated by domain control. Therefore, from the viewpoint of reducing iron loss, a higher number of domain control points is preferable. For example, the preferred number of domain control points in the oriented electromagnetic steel sheet 1 is per 10,000 mm. 2 It can be 10 points or more, 50 points or more, or 100 points or more.

[0107] (Measurement Method)

[0108] The following describes the method for measuring various parameters of the orientation-oriented electromagnetic steel sheet 1 according to this embodiment. The measurement of any parameter is performed on a sample taken from the orientation-oriented electromagnetic steel sheet 1. For example, a rectangular sample with a length of 100 mm (or more) on both sides can be cut from the orientation-oriented electromagnetic steel sheet 1 for measurement. When the orientation-oriented electromagnetic steel sheet 1 is a roll, the sample can be taken from any part of the roll. Alternatively, when the orientation-oriented electromagnetic steel sheet 1 is a component assembled into a transformer, motor, or other motor product, the sample can be taken from any part of the component. When the component is small, the length of one side of the sample can be set to less than 100 mm. In this case, the total area of ​​the sample is set to 10000 mm². 2 That concludes the above. At this point, to minimize the impact of mechanical strain and other factors on the specimen, it is preferable to obtain the specimen using methods such as wire cutting.

[0109] (Specific method of magnetic domain control processing line 11)

[0110] When the domain control processing line 11 is a slot, the domain control processing line 11 can be identified by visual inspection. When the oriented electromagnetic steel sheet 1 has an insulating film, the domain control processing line 11 can be visually identified by removing the insulating film using a known stripping agent.

[0111] When the magnetic domain control processing line 11 is subjected to thermal strain, it may sometimes be impossible to identify the magnetic domain control processing line 11 visually. In such cases, an image acquisition device may be used to capture an image of the magnetic domain. As needed, a DC magnetic field is applied along the normal direction ND of the rolled surface of the oriented electromagnetic steel sheet 1 while capturing an image of the magnetic domain. By observing the image of the magnetic domain, the location of the thermal strain can be identified.

[0112] (Specific methods for rolling direction RD and rolling right angle direction TD)

[0113] The rolling direction RD and the rolling right-angle direction TD of the orientation-oriented electromagnetic steel sheet 1 are specified by the means listed below.

[0114] (1) When the sample is cut from a coil of oriented electromagnetic steel sheet 1, the width direction of the coil is regarded as the rolling right-angle direction TD. In addition, the direction perpendicular to the rolling right-angle direction TD and the rolling surface normal direction ND is regarded as the rolling direction RD.

[0115] (2) In the case where the sample is cut from a component of an electric motor product, the rolling direction RD and the rolling right-angle direction TD are determined based on the rolling marks on the surface of the oriented electromagnetic steel sheet 1. The direction of extension of the rolling marks is regarded as the rolling direction RD. The direction perpendicular to the rolling direction RD and the normal direction ND of the rolling surface is regarded as the rolling right-angle direction TD.

[0116] (3) When it is difficult to specify the rolling direction RD and the rolling right-angle direction TD based on the surface marks of the oriented electromagnetic steel sheet 1, the rolling direction RD and the rolling right-angle direction TD are specified based on the crystal orientation of the oriented electromagnetic steel sheet 1. Specifically, the crystal orientation of the oriented electromagnetic steel sheet 1 to be evaluated is measured at multiple points. Moreover, the easy magnetization axis at which the crystal orientation at the measurement point forms an angle with the normal direction ND (thickness direction) of the rolling surface is closest to a right angle is selected. <001> The direction with the smallest offset angle is considered as the rolling direction RD, and the direction perpendicular to the rolling direction RD and the normal direction ND of the rolling surface is considered as the rolling right-angle direction TD.

[0117] (Methods for measuring α and γ angles)

[0118] The α and γ angles are determined using the Laue method of side reflection. The Laue method is widely known as a method for determining crystal orientation. The α and γ angles are obtained by rounding the measured values ​​to the second decimal place. That is, the significant figures of the α and γ angles are set to the first decimal place.

[0119] (Method for determining the distribution of angle α)

[0120] The method for measuring the distribution of the α angle on the surface of the original plate of the orientation-oriented electromagnetic steel sheet 1 is as follows: Measurement points are set in a grid pattern on the surface of the original plate of the orientation-oriented electromagnetic steel sheet 1. The α angle is measured at each measurement point.

[0121] Specifically, for the surface of the original plate of the oriented electromagnetic steel sheet 1, measurement points are set in a grid pattern at 2mm intervals along the rolling direction RD and the rolling right-angle direction TD. Angle α is measured at each measurement point to determine the distribution of angle α on the surface of the original plate of the oriented electromagnetic steel sheet 1.

[0122] (|α) All | Calculation method)

[0123] |α All The calculation method for | is summarized below. For example... Figure 5 As illustrated, measurement points are set in a grid pattern on the surface of a sample taken from the oriented electromagnetic steel sheet 1. The absolute value of angle α is measured at each measurement point, and their average value is calculated. This average value is considered as |α| All |

[0124] Specifically, for samples with one side length greater than 100 mm ( Figure 5 An imaginary line VL1 parallel to the rolling right-angle direction TD and an imaginary line VL2 parallel to the rolling direction RD are set on the surface of a rectangular area (enclosed by a single-dotted line). The presence of the magnetic domain control processing line 11 is not considered when setting the imaginary lines VL1 and VL2. The spacing between the imaginary lines VL1 and VL2 is 2 mm. The imaginary lines VL1 and VL2 are arranged across the entire surface of the sample. The absolute value of the angle α at the intersection point VP1 of the imaginary lines VL1 and VL2 is measured.

[0125] (|α) Dr | Calculation method)

[0126] |α Dr The calculation method for | is as follows. First, for a sample with one side greater than 100mm ( Figure 1 or Figure 2 On the surface of a rectangular area (enclosed by a single-dot dashed line), multiple imaginary lines VL3 are set at regular intervals parallel to the rolling direction RD of the oriented electromagnetic steel sheet 1. VL3 and |α All The imaginary line VL2 parallel to the rolling direction RD used in the calculation can be the same or different. The spacing of the imaginary lines VL3 is 2 mm. The imaginary lines VL3 are arranged across the entire surface of the sample. Next, specific domain control points VP2 (i.e., the intersection of the imaginary line VL3 and the domain control treatment line 11) are determined. Then, the absolute value of the α angle of each domain control point VP2 is measured, and their average value is calculated. This average value is considered as |α|. Dr The specific methods for the rolling direction RD and the magnetic domain control processing line 11, and the method for measuring the α angle are as described above.

[0127] (σα) All (Determination method)

[0128] σα All By calculating |α All The α angle is calculated using the standard deviation of the absolute value of the angle at each measurement point. The specific method for calculating the absolute value of the angle α at each measurement point is as described above.

[0129] (σα) Dr (Determination method)

[0130] σα Dr The values ​​of the absolute values ​​of the α angles of the respective domain control points VP2 are calculated. The specific method for determining the domain control points VP2 is as described above.

[0131] (|γ) All | Calculation method)

[0132] |γ AllThe calculation method for | is summarized below. For the surface of the sample taken from the oriented electromagnetic steel plate 1, as... Figure 5 As illustrated, measuring points are set in a grid pattern with 2mm intervals along the rolling direction RD and the right-angle rolling direction TD. The absolute value of the γ angle is measured at each measuring point, and their average value is calculated. This average value is considered as |γ All |

[0133] (Method for determining the chemical composition of original plate 2 and oriented electromagnetic steel plate 1)

[0134] The chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the original sheet 2 can be determined using general analytical methods for steel. For example, the chemical composition can be determined using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). Specifically, a test piece is taken from the center of the sample along its thickness direction, and the chemical composition of the orientation-oriented electromagnetic steel sheet 1 and the original sheet 2 can be determined using a Shimadzu ICPS-8100 (measuring device) under conditions based on a pre-prepared standard curve. The contents of C and S, which are difficult to determine in ICP-AES, can be determined using the combustion-infrared absorption method. The N content can be determined using the inactive gas melting-thermal conductivity method.

[0135] When a magnesium olivine coating and / or an insulating coating are formed on the orientation-oriented electromagnetic steel sheet 1, the chemical composition of the orientation-oriented electromagnetic steel sheet 1 (i.e., the chemical composition of the base steel sheet) can be analyzed after removing the magnesium olivine coating and / or the insulating coating from the orientation-oriented electromagnetic steel sheet 1. The insulating coating can be removed, for example, by immersing the sample in a sodium hydroxide solution, followed by immersion in dilute sulfuric acid and nitric acid. The temperature and concentration of the sodium hydroxide, dilute sulfuric acid, and nitric acid solutions, the immersion time, and other conditions are appropriately adjusted so that the iron base of the sample does not dissolve excessively. An example of the conditions for removing the insulating coating is as follows: First, the sample is immersed in a 20% sodium hydroxide solution at 80°C for 15 minutes. Then, the sample is dried. Then, the sample is immersed in a 10% dilute sulfuric acid solution at 80°C for 4 minutes. Then, the sludge adhering to the surface of the sample is removed with rags or the like. Next, the sample is immersed in a 10% nitric acid solution at room temperature for about 10 seconds while stirring.

[0136] For example, forsterite coatings can be removed by immersing the sample in sulfuric acid followed by nitric acid. Appropriate adjustments to the temperature and concentration of the sulfuric and nitric acids, as well as the immersion time, are necessary to prevent excessive dissolution of the iron-based components in the sample. An example of the conditions for removing forsterite coatings is as follows: First, immerse the sample in 10% sulfuric acid at 80°C for 3 minutes. Then, wash the surface of the sample with water using a rag or similar material to remove any adhering residue. Next, allow the sample to dry. Then, immerse the sample in 10% nitric acid at room temperature for approximately 5 seconds while stirring.

[0137] (Method for determining the angle between the magnetic domain control processing line 11 and the rolling right-angle direction TD)

[0138] The angle between the domain control processing line 11 and the rolling right-angle direction TD can be measured using a known angle measurement method after specifying the domain control processing line 11 and the rolling right-angle direction TD in the above order.

[0139] (Method for measuring the spacing of the magnetic domain control processing line 11 along the rolling direction RD)

[0140] The spacing of the domain control processing line 11 along the rolling direction RD can be measured using known length measurement methods after specifying the domain control processing line 11 and the rolling direction RD in the order described above.

[0141] (Method for determining the magnitude of tensile stress introduced into thermal strain)

[0142] The magnitude of the tensile stress introduced in the thermal strain was determined using the EBSD Wilkinson method and the Cross Court manufactured by BLG Vantage. The EBSD Wilkinson method is described in detail in AJ Wilkinson, et al. "High-resolution elastic strain measurement from electron backscatter diffraction patterns: New levels of sensitivity" Ultramicroscopy Vol 106, No.4-5, March 2006, pp.307-313.

[0143] When determining the magnitude of tensile stress introduced by thermal strain using the EBSD Wilkinson method and a Cross Court manufactured by BLG Vantage, the domain control processing line 11 is first specified according to the steps described above. Next, the orientation-type electromagnetic steel sheet 1 is cut through the domain control processing line 11 and perpendicular to it. This cut surface is used as the measurement surface. For the cross-section of the domain control processing line 11 included in the measurement surface, analysis is performed using the EBSD Wilkinson method and a Cross Court manufactured by BLG Vantage to extract the tensile stress components relative to any direction and determine their magnitude. For example, tensile stress components in the rolling surface normal direction ND, the direction parallel to the domain control processing line 11, and the directions perpendicular to both the rolling surface normal direction ND and the domain control processing line 11 can be extracted.

[0144] The number of measurement sites is, for example, 10. If, at least one site on the orientation-oriented electromagnetic steel sheet 1, the tensile stress relative to any direction is 40 MPa or more (i.e., the tensile stress relative to at least one direction is 40 MPa or more), it is determined that the maximum value of the tensile stress relative to any direction in the magnetic domain control processing lines of the orientation-oriented electromagnetic steel sheet 1 is 40 MPa or more. The measurement of tensile stress may also be stopped when a measurement point where the tensile stress relative to any direction is found to be 40 MPa or more.

[0145] (Methods for measuring the depth and width of the groove)

[0146] The depth and width of the groove can be determined by using a known three-dimensional measuring machine to measure the surface shape of a specific sample. In the case where the oriented electromagnetic steel sheet 1 has a tension insulating film, the three-dimensional measurement of the sample surface is performed after removing the insulating film according to the steps described above.

[0147] Example

[0148] The effects of one aspect of the present invention are further illustrated through the examples. However, the conditions in the examples are merely examples used to confirm the feasibility and effects of implementing the present invention. The present invention is not limited to this single example. Various conditions can be used to achieve the purpose of the present invention as long as they do not depart from its spirit.

[0149] Oriented electromagnetic steel sheets from the same batch with a thickness of 0.20 mm were used as the base sheets. Magnetic domain control treatment was performed on the base sheets under the various conditions shown in Table 1. The noise and iron loss of the resulting oriented electromagnetic steel sheets after magnetic domain control treatment were evaluated and recorded in Table 2. In Table 1, values ​​outside the range of the oriented electromagnetic steel sheets of this embodiment are underlined. In Table 2, values ​​that do not meet the following acceptance / disacquisition criteria are underlined.

[0150] The evaluation methods for noise and iron loss are as follows. First, 205 sheets of 0.20mm thick oriented electromagnetic steel plates were stacked to fabricate three-phase transformer cores. The width of the legs and yoke of the three-phase transformer cores was 150mm. The height and width of the three-phase transformer cores were both 750mm. The noise and iron loss of these three-phase transformer cores were measured. The measurement conditions were set as follows: frequency: 60Hz and excitation flux density: 1.8T.

[0151] During noise measurement, microphones were placed at equal intervals at eight locations around the transformer where the three-phase transformer core was assembled. The distance between the transformer and the microphones was set to 30 cm. The noise measurement results from these microphones were corrected for A-characteristics and averaged to obtain the noise evaluation results (in dBA) for the oriented electromagnetic steel sheet, and are recorded in Table 2. Examples with noise evaluation results below 51.00 dBA were considered to have achieved low noise. Noise evaluation results deemed unacceptable were underlined.

[0152] As described above, the iron loss was determined by measuring the voltage and current on the primary and secondary sides using a power analyzer when excitation was performed at a frequency of 60 Hz and an excitation flux density of 1.8 T. The calculated iron loss, as the iron loss evaluation results (unit: W / kg) for oriented electromagnetic steel sheets, is recorded in Table 2. Examples with an iron loss evaluation result of 1.270 W / kg or less were judged as examples that achieved low iron loss. Noise evaluation results that were judged as unqualified were marked with an underline.

[0153] Furthermore, the |α| in the oriented electromagnetic steel sheet after the magnetic domain control treatment was measured. All |、|α Dr |、|γ All |、σα All and σα Dr The results are recorded in Table 2. The measurement method generally follows the steps described above. A rectangular sample with two sides measuring 100 mm was cut from the core of the three-phase transformer used for noise and iron loss measurements for testing.

[0154]

[0155]

[0156] In Example 10, all magnetic domain control lines are formed across the entire width of the oriented electromagnetic steel sheet. As a result, Example 10 does not satisfy |α All |-|α Dr |≥0.1°. In example number 10, the iron loss is within the acceptable range, but the noise characteristics are unacceptable.

[0157] In Example 11, the domain control processing lines are formed as dashed lines. That is, in Example 11, regions where no domain control processing is performed are set up in the same way as in Examples 1-9. However, in Example 11, the size of the gaps between the domain control processing lines contained in the dashed lines is randomly distributed. The areas where no domain control processing is performed are randomly set. As a result, Example 11 does not satisfy |α All |-|α Dr |≥0.1°. In example number 11, the iron loss is within the acceptable range, but it is the same as the acceptable threshold of 1.270. Additionally, in example number 11, the noise characteristics are unacceptable.

[0158] In Example 12, the domain control processing lines are formed as regularly spaced dashed lines. That is, in Example 12, regions where no domain control processing is performed are set up, similar to Examples 1-9. However, in Example 12, the spacing between the domain control processing lines contained within the dashed lines is set to a constant value. The regions where no domain control processing is performed are arranged regularly. As a result, Example 12 does not satisfy |α... All |-|α Dr |≥0.1°. In example number 12, both iron loss and noise characteristics are non-compliant.

[0159] In Examples 13 and 14, similar to Example 11, the domain control processing lines are formed as dashed lines. That is, in Examples 13 and 14, regions where domain control processing is not performed are set up, similar to Examples 1-9. However, in Examples 13 and 14, domain control processing is applied to regions where the α-angle is greater than a specified value, defined by the distribution based on the α-angle. These examples also do not satisfy |α... All |-|α Dr |≥0.1°. In examples 13 and 14, the iron loss is unacceptable.

[0160] On the other hand, in Examples 1-9, magnetic domain control processing is applied to regions where the α angle is below a specified value, defined by the distribution based on the α angle. Examples 1-9 satisfy |α All |-|α Dr |≥0.1°, both noise characteristics and iron loss are within acceptable ranges. Through examples 1~9, both low iron loss and low noise were achieved.

[0161] Based on examples 1-9, we can confirm that |α All |-|α Dr The larger the value of |γ|, the better the noise characteristics. Furthermore, in examples 6-9, the condition |γ| is satisfied. All |-|α Dr |≥0.1°. In these examples, the noise characteristics are further improved. Additionally, in example number 9, |γ| is satisfied. All |-|αDr |≥0.1°, and satisfy σα Dr <σα All In this example, the noise characteristics are even better.

[0162] Industrial availability The hot-rolled steel sheet disclosed herein can achieve both low iron loss and low noise, thus having high potential for industrial application.

[0163] Explanation of reference numerals in the attached figures 1. Oriented Electromagnetic Steel Sheet 11 Magnetic Domain Control Processing Line 12A Region with small α angle 12B Region with large α angle RD rolling direction TD rolling right angle direction ND (Normal direction of the rolled surface) VL1 |α All |Imaginary line parallel to TD used for calculation VL2 |α All |Imaginary line parallel to RD used for calculation VL3 |α Dr |Imaginary line parallel to TD used for calculation VP1 is the intersection of imaginary lines VL1 and VL2. VP2 domain control point 2 original boards 21 Magnetic domain control processing area 22 Non-magnetic domain control processing region 30 Image Acquisition Device 31 Light Source Section 500 laser irradiation device 501 Multifaceted Mirror 503 Light Source Device 505 Collimator 507 Condensing Lens 509 Motor 511 sensor 513 Control Department 515 Through-plate device

Claims

1. A type of oriented electromagnetic steel sheet, wherein the oriented electromagnetic steel sheet has magnetic domain control treatment lines on its surface. It satisfies |α All |-|α Dr |≥0.1°, |α All | is the average of the absolute values ​​of the angle α across the entire surface of the oriented electromagnetic steel sheet. |α Dr | is the average value of the absolute value of the angle α at the intersection point of multiple imaginary lines set parallel to the rolling direction of the oriented electromagnetic steel sheet at 2mm intervals and the magnetic domain control processing line, i.e., the magnetic domain control point.

2. The orientation-oriented electromagnetic steel sheet according to claim 1, which satisfies |α All |-|α Dr |≥0.2°.

3. The orientation-oriented electromagnetic steel sheet according to claim 1, which satisfies |α All |-|α Dr |≥0.5°.

4. The orientation-oriented electromagnetic steel sheet according to claim 1, which satisfies |α All |-|α Dr |≥1.0°.

5. The orientation-grade electromagnetic steel sheet according to any one of claims 1 to 4, It satisfies |γ All |-|α Dr |≥0.1°, |γ All | is the average absolute value of the angle γ across the entire surface of the oriented electromagnetic steel sheet.

6. The orientation-grade electromagnetic steel sheet according to any one of claims 1 to 4, It satisfies σα Dr <σα All , σα All It is the standard deviation of the absolute value of the angle α, which is the entirety of the surface of the oriented electromagnetic steel sheet. σα Dr It is the standard deviation of the absolute value of the angle α at the domain control point.

7. The oriented electromagnetic steel sheet according to any one of claims 1 to 4, wherein, The magnetic domain control processing line is a slot.

8. A method for manufacturing an orientation-oriented electromagnetic steel sheet, comprising: The process of determining the distribution of the α angle on the surface of the original oriented electromagnetic steel sheet; The process for a region where the absolute value of the specific α angle is less than 5°; and The process of forming magnetic domain control processing lines in the region where the absolute value of the α angle is less than 5°.

9. The method for manufacturing a grain-oriented electromagnetic steel sheet according to claim 8, characterized in that, Magnetic domain control processing is applied by irradiation with lasers or electron beams.

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