WO2021084793A1 - 絶縁被膜付き電磁鋼板 - Google Patents
絶縁被膜付き電磁鋼板 Download PDFInfo
- Publication number
- WO2021084793A1 WO2021084793A1 PCT/JP2020/024932 JP2020024932W WO2021084793A1 WO 2021084793 A1 WO2021084793 A1 WO 2021084793A1 JP 2020024932 W JP2020024932 W JP 2020024932W WO 2021084793 A1 WO2021084793 A1 WO 2021084793A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- rolling
- electromagnetic steel
- insulating coating
- insulating film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
Definitions
- the present invention relates to an electromagnetic steel sheet with an insulating coating.
- the present invention particularly relates to an electromagnetic steel sheet with an insulating film, which is excellent in magnetic properties and adhesiveness to the film of the insulating film, and more particularly to a grain-oriented electrical steel sheet with an insulating film.
- Electrical steel sheets are soft magnetic materials that are widely used as iron core materials for rotating machines and stationary devices.
- grain-oriented electrical steel sheets are soft magnetic materials used as iron core materials for transformers and generators, and have a crystal structure in which the ⁇ 001> orientation, which is the easy axis of iron magnetization, is highly aligned in the rolling direction of the steel sheet. Is.
- such an texture preferentially grows the crystal grains in the (110) [001] orientation, which is the so-called Goth orientation, during the secondary recrystallization annealing. Formed through secondary recrystallization.
- the surface of grain-oriented electrical steel sheet is coated with an insulating film (phosphate film) mainly composed of phosphate.
- the phosphate coating is provided on the surface of grain-oriented electrical steel sheets for the purpose of imparting insulation and tension to improve magnetic properties, but practical performance such as workability, coating adhesion, and rust prevention is also required. Will be done.
- the phosphate coating is formed at a high temperature exceeding 800 ° C., and has a lower coefficient of thermal expansion than that of a steel sheet. Therefore, tension is applied to the steel sheet due to the difference in the coefficient of thermal expansion between the steel sheet and the coating when the temperature drops to room temperature. It has the effect of reducing iron loss.
- Patent Document 2 contains a coating mainly composed of magnesium phosphate, colloidal silica and chromic anhydride
- Patent Document 3 contains a coating mainly composed of aluminum phosphate, colloidal silica and chromic anhydride.
- Patent Document 4 proposes a coating film using fibrous colloidal silica.
- Patent Document 5 Since the coefficient of thermal expansion of such a coating is isotropic, tension is applied to the steel sheet isotropically. It is known that when tension is applied in the rolling direction, the magnetic domains are subdivided and iron loss is reduced, while when tension is applied in the direction perpendicular to rolling, iron loss is increased. As a method for preventing such a problem, there is a technique disclosed in Patent Document 5. The technique disclosed in Patent Document 5 controls the tension in the rolling direction and the rolling perpendicular direction by changing the thickness of the insulating coating in the rolling perpendicular direction.
- An object of the present invention is to provide an electromagnetic steel sheet with an insulating coating, which can apply a larger tension in the rolling direction than in the direction perpendicular to rolling and has an insulating coating having excellent film adhesion.
- Patent Document 5 The present inventors have found that the same effect as in Patent Document 5 can be obtained by an insulating coating containing a crystalline fibrous substance with high orientation, and completed the present invention.
- the ratio (L RD / L TD) is 1.5 or more 50.0 or less, an insulating film with an electromagnetic steel sheet perpendicular to the rolling direction length in the direction perpendicular to the rolling direction cross-section (L TD).
- the ratio (L ND / d) of the length in the thickness direction (L ND ) to the film thickness (d) of the insulating film in the rolling perpendicular cross section of the crystalline fibrous substance in the insulating film is 0.
- the insulating coating contains one or more metal elements selected from Mg, Al, Ca, Ba, Sr, Zn, Ti, Nd, Mo, Cr, B, Ta, Cu, and Mn.
- the electromagnetic steel sheet with an insulating coating according to any one of [1] to [4], which contains a phosphate.
- an electromagnetic steel sheet with an insulating coating which can apply a larger tension in the rolling direction than in the direction perpendicular to rolling and has an insulating coating having excellent film adhesion.
- the present invention by controlling the tension applied by the insulating film in the rolling direction of the steel sheet and the direction perpendicular to the rolling direction, iron loss is improved, and the film adhesion of the slit edge portion during slit processing and the film adhesion during bending processing are performed. It is possible to provide an electromagnetic steel sheet with an insulating coating having improved coating adhesion.
- FIG. 1 is a schematic view illustrating the definitions of a rolling direction cross section and a rolling perpendicular direction cross section in the present invention.
- Figure 2 is a schematic diagram for explaining the definition of the direction perpendicular to the rolling direction length in the direction perpendicular to the rolling direction cross-section of the crystalline fibrous substance in the insulating coating (L TD) and thickness direction length (L ND).
- FIG. 3 is a schematic view illustrating the definition of the rolling direction length (LRD ) in the rolling direction cross section of the crystalline fibrous material in the insulating coating.
- a sample was prepared as follows. From a directional electromagnetic steel sheet with a thickness of 0.20 mm manufactured by a known method and having a size of 300 mm in the rolling direction ⁇ 100 mm in the direction perpendicular to the rolling, a steel sheet having a size of 300 mm in the rolling direction ⁇ 100 mm in the rolling perpendicular direction is cut out by shearing to remove an unreacted annealing separator. after, stress relief annealing (800 ° C., 2 hours, N 2 atmosphere) was subjected to. A coating mainly composed of forsterite was formed on the surface of the steel sheet. Next, it was lightly pickled with a 5 mass% phosphoric acid aqueous solution. Then, an insulating film was formed on the steel sheet after the light pickling as follows.
- An aqueous solution obtained by mixing 100 parts by mass of a first magnesium phosphate aqueous solution in terms of solid content, 50 parts by mass of colloidal silica in terms of SiO 2 solid content, and 10 parts by mass of cordierite is diluted with pure water.
- a treatment liquid (coating liquid) for forming an insulating film adjusted to a specific gravity of 1.20 was prepared.
- the coating liquid was applied to the surface of the steel sheet with a roll coater so that the total amount of the coating liquid on both sides of the steel sheet after drying was 9 g / m 2.
- the primary particles of cordierite were hexagonal columnar, with an a-axis length of 0.8 ⁇ m and a c-axis length of 4.5 ⁇ m.
- the coefficient of linear thermal expansion of the cordierite in the temperature range from 25 ° C. to 800 ° C. is 2.9 ⁇ 10 -6 / K (a-axis direction) and ⁇ 1.0 ⁇ 10 -6 / K (c). Axial), the coefficient of thermal expansion in the temperature range from 25 ° C to 800 ° C was 4.8 ⁇ 10-6 / K.
- the sheet was placed in a drying oven, dried at 300 ° C. for 1 minute, and then baked at 850 ° C. for 30 seconds under the condition of N 2 : 100 vol% atmosphere to form an insulating film on the surface of the steel sheet.
- the obtained insulating film with an electromagnetic steel sheet samples for each test was collected and stress relief annealing (800 ° C., 2 hours, N 2 atmosphere) and subjected to the test after performing.
- the strain-removing annealing can be omitted in the case of a sampling method in which strain is not applied at the time of sampling, or in the case of SEM observation where there is no problem with the influence of strain.
- the dispersion state of the cordierite in the insulating coating of the sample thus obtained was confirmed by observing the processed cross section by the FIB (focused ion beam) with the reflected electron beam image of the SEM (scanning electron microscope), and the cordier Measure the ratio ( LRD / LTD ) of the length in the rolling direction (LRD ) of the light to the length in the direction perpendicular to the rolling (LTD ), the length in the plate thickness direction ( LND ), and the film thickness (d) of the insulating coating. did.
- the tension (the tension applied to the steel sheet in each of the rolling direction and the rolling perpendicular direction) is a sample for measuring the tension in the rolling direction from the electromagnetic steel sheet with an insulating coating obtained as described above (rolling direction 280 mm, rolling perpendicular direction 30 mm).
- the adhesion of the coating film was evaluated by observing the length of the region where the insulating coating was peeled off when the electromagnetic steel sheet with the insulating coating obtained as described above was sheared in the rolling direction. At a length of 20 mm at the end (shear end) of the sample after shearing, the length in the direction perpendicular to rolling where the insulating film is peeled off from the shear end is measured, and when the maximum value is 100 ⁇ m or less, the adhesion is good. The case where the thickness exceeds 100 ⁇ m was regarded as poor adhesion.
- the method for measuring the peeling length of the insulating film is not particularly limited, but it can be measured by, for example, 50 times SEM observation.
- the magnetic property (iron loss (W 17/50 )) is a sample obtained by shearing an electromagnetic steel sheet with an insulating coating obtained as described above in a rolling perpendicular direction of 30 mm ⁇ a rolling direction of 280 mm by the method specified in JIS C 2550. to, stress relief annealing (800 ° C., 2 hours, N 2 atmosphere) was measured by using those subjected to.
- the magnetic flux density (B 8 ) of each sample was 1.92 T.
- the electromagnetic steel sheet forming the insulating film of the present invention one manufactured by a known method can be used, and either a directional electromagnetic steel sheet or a non-oriented electrical steel sheet can be used.
- a suitable grain-oriented electrical steel sheet for example, a grain-oriented electrical steel sheet manufactured by the following method can be used.
- C 0.001 to 0.10%
- C is a component useful for the generation of Goth-oriented crystal grains, and in order to effectively exert such an action, it is preferable to contain C in an amount of 0.001% or more.
- the C content is preferably in the range of 0.001 to 0.10%.
- Si 1.0-5.0%
- Si is a component necessary for increasing electrical resistance to reduce iron loss, stabilizing the BCC structure of iron and enabling high-temperature heat treatment, and the Si content is 1.0% or more. Is preferable. On the other hand, if the Si content exceeds 5.0%, normal cold rolling may be difficult. Therefore, the Si content is preferably in the range of 1.0 to 5.0%. The Si content is more preferably in the range of 2.0 to 5.0%.
- Mn 0.01-1.0% Mn not only effectively contributes to the improvement of hot brittleness of steel, but also functions as an inhibitor of crystal grain growth by forming precipitates such as MnS and MnSe when S and Se are mixed. Demonstrate.
- the Mn content is preferably 0.01% or more.
- the Mn content is preferably in the range of 0.01 to 1.0%.
- Al 0.003 to 0.050%
- Al is a useful component that forms AlN in steel and acts as an inhibitor as the second dispersion phase. It is preferably contained in an amount of 0.003% or more as Al.
- the Al content is sol. If it exceeds 0.050% as Al, AlN may be coarsely precipitated and the action as an inhibitor may be lost. Therefore, the Al content is sol.
- the range of Al is preferably 0.003 to 0.050%.
- N 0.001 to 0.020% Since N is also a component necessary for forming AlN like Al, it is preferably contained in an amount of 0.001% or more. On the other hand, if N is contained in excess of 0.020%, blisters and the like may occur during slab heating. Therefore, the N content is preferably in the range of 0.001 to 0.020%.
- Total of 1 or 2 selected from S and Se are useful components that combine with Mn and Cu to form MnSe, MnS, Cu 2- xSe and Cu 2- xS, and exert an inhibitory action as the second dispersion phase in steel.
- the total content of these S and Se is preferably 0.001% or more.
- the content of S and Se is preferably in the range of 0.001 to 0.05% in total in both cases where one type of S or Se is contained and two types of S and Se are contained.
- the balance other than the above can be a component composition of Fe and unavoidable impurities.
- Cu 0.2% or less, Ni: 0.5% or less, Cr: 0.5% or less, Sb: 0.1% or less, Sn: 0.5% or less, Mo: It can contain one or more selected from 0.5% or less and Bi: 0.1% or less.
- an element having an action as an auxiliary inhibitor examples include the above-mentioned elements that easily segregate on the crystal grain size and the surface. The lower limit of these elements is not particularly limited, but in order to obtain a useful effect with each component, the content of each element should be Cu: 0.01% or more, Ni: 0.01% or more.
- B 0.01% or less
- Ge 0.1% or less
- P 0.1% or less
- Te 0.1% or less
- Nb It can contain one or more selected from 0.1% or less, Ti: 0.1% or less, and V: 0.1% or less.
- the lower limit of these elements is not particularly limited, but in order to obtain a useful effect with each component, the content of each element should be B: 0.001% or more, Ge: 0.001% or more. , As: 0.005% or more, P: 0.005% or more, Te: 0.005% or more, Nb: 0.005% or more, Ti: 0.005% or more, V: 0.005% or more. Is preferable.
- a steel having the component composition described above is melted by a conventionally known refining process to obtain a steel material (steel slab) by a continuous casting method or an ingot-integral rolling method, and then the steel slab is heated. It is rolled between hot-rolled plates to obtain a hot-rolled plate, and if necessary, it is annealed with a hot-rolled plate and then cold-rolled once or twice or more with an intermediate annealing sandwiched between them to obtain a cold-rolled plate with a final plate thickness.
- an annealing separator containing MgO as a main component is applied and final finish annealing is performed to form a coating layer mainly composed of forsterite, and then an insulating coating is formed.
- a manufacturing method consisting of a series of steps of applying a treatment liquid (coating liquid) for forming an insulating film containing a predetermined component for forming, performing a drying treatment as necessary, and then undergoing flattening annealing that also serves as baking. Therefore, an electromagnetic steel sheet with an insulating coating can be manufactured.
- the above manufacturing method is an example, and the present invention is not limited to this, and various conventionally known manufacturing methods can be applied.
- a separating agent mainly composed of Al 2 O 3 after decarburization annealing forsterite is not formed after final finish annealing, and then the undercoat is coated by a method such as CVD, PVD, sol-gel method, or steel plate oxidation.
- a layer can be formed and then an insulating film can be formed, or if the insulating film according to the present invention is used, an insulating film layer can be directly formed on the surface of the base steel without forming a base film layer.
- the crystalline fibrous substance means a crystalline substance having an aspect ratio of 1.5 or more.
- the aspect ratio is a value measured as follows.
- the crystalline fibrous substance (aggregate) to be measured is measured with an image analysis particle size distribution meter ("IF-200 nano” manufactured by Jasco International Co., Ltd.), and image analysis software ("PIA-Pro” manufactured by Jasco International Co., Ltd.) is used. ), The mean value of the ferret width (minimum diameter of the interval between the parallel two straight lines sandwiching the particle image) and the average value of the ferret length (ferley diameter orthogonal to the minimum ferret diameter) of 1000 or more crystalline fibrous substances. The ratio (average ferret length / average ferret width) is obtained, and this is used as the aspect ratio of the crystalline fibrous material.
- the fibrous substance needs to be crystalline. This is because when the fibrous substance is amorphous, the phase surrounding the fibrous substance and the amorphous fibrous substance phase easily react during baking at a high temperature, and the phase boundary becomes unclear and the tension applied to the steel plate becomes unclear. This is because the anisotropy of
- the crystalline fibrous substance As the crystalline fibrous substance, a synthetic product or a commercially available product may be used. As the crystalline fibrous substance, an inorganic substance is preferable. As the inorganic substance, for example, 2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2, Al 2 O 3, MgO ⁇ SiO 2, Al 2 TiO 5, CaO-ZrO 2, Y 2 O 3 -ZrO 2, LaSrAlO 4, Sr 2 TiO 4 and the like can be mentioned.
- Rolling direction length (LRD ) in rolling direction cross section, rolling perpendicular direction length ( LTD ) in rolling perpendicular direction cross section, plate thickness direction length in rolling perpendicular direction cross section of crystalline fibrous material in insulating coating ( LND ) and the thickness (d) of the insulating coating are measured by observing the cross section by FIB with SEM.
- the length in the direction perpendicular to rolling ( LTD ), the length in the thickness direction ( LND ), and the film thickness (d) of the insulating coating are measured from the cross section in the direction perpendicular to the rolling, and the length in the rolling direction ( LRD ) is measured in the rolling direction. Perform from the cross section.
- L RD, L TD, the measurement of L ND is observed with magnification, such as contain 5 or more crystalline fibrous material mean value of the measured values of all of the crystalline fibrous material within the observation field of view Is used.
- the crystalline fibrous substance in the insulating film may be aggregated into secondary particles as well as the primary particles, but the state in which the particles can be distinguished from the particles in the insulating film may be measured. ..
- As the film thickness (d) of the insulating film the average value of the film thickness in the cross section in the direction perpendicular to the rolling direction was used.
- the average value of the film thickness it is preferable to measure the film thickness in the widest possible range to obtain the average information, but in the present invention, the average value of the film thickness of the insulating film having a width of 20 ⁇ m in the cross section in the direction perpendicular to the rolling direction is used. .. 1 to 3 show the definition of each length in a schematic diagram.
- the fibrous substance in the insulating film is crystalline or amorphous can be confirmed by performing electron diffraction on the cross section of the insulating film by TEM.
- the ratio of the rolling direction length in the rolling direction cross-section of the crystalline fibrous material (L RD) and perpendicular to the rolling direction cross-section perpendicular to the rolling direction length of (L TD) (L RD / L TD) 1.5 or more is 50. It shall be 0 or less.
- LRD / LTD By setting LRD / LTD to 1.5 or more, it is possible to impart anisotropy to the tension applied by the insulating film and improve the effect of reducing iron loss. Further, suppressing the deterioration of coating adhesion of the insulating coating (bending adhesion) by the L RD / L TD 50.0 or less.
- the LRD / LTD is preferably 3.0 or more, and more preferably 10.0 or more. Further, L RD / L TD is preferably 40.0 or less, more preferably 30.0 or less.
- the length (L) in the thickness direction of the crystalline fibrous material in the rolling perpendicular cross section is preferably 0.2 or more, and more preferably 0.3 or more.
- the ratio of the cross-sectional length in the plate thickness direction (L ND ) to the film thickness (d) of the insulating coating (L ND /) d) is preferably 2.0 or less, more preferably 1.5 or less, and even more preferably 1.0 or less.
- the area ratio of the cross-sectional area of the crystalline fibrous substance in the insulating film to the cross-sectional area of the insulating film in the cross section in the direction perpendicular to the rolling (crystalline fibrous) is preferably 0.1 or more and 0.9 or less. More preferably, the area ratio is 0.2 or more. Further, the area ratio is more preferably 0.8 or less.
- the volume thermal expansion coefficient of the crystalline fibrous substance in the temperature range of 25 ° C. to 800 ° C. is preferably 30 ⁇ 10 -6 / K or less.
- the volume coefficient of thermal expansion may take a negative value.
- the volume coefficient of thermal expansion is preferably 15 ⁇ 10 -6 / K or less.
- the linear thermal expansion coefficient of the crystalline fibrous substance in the temperature range of 25 ° C. to 800 ° C. is anisotropy.
- the directional anisotropy of the coefficient of linear thermal expansion ( ⁇ ) is preferably such that ⁇ LA is smaller than ⁇ SA.
- the difference between ⁇ LA and ⁇ SA is more preferably 1.0 ⁇ 10 -6 / K or more.
- the difference between ⁇ LA and ⁇ SA is preferably 20 ⁇ 10 -6 / K or less.
- ⁇ LA is the coefficient of linear thermal expansion in the major axis direction of the crystalline fibrous material
- ⁇ SA is the coefficient of linear thermal expansion in the minor axis direction of the crystalline fibrous material.
- the above-mentioned volume coefficient of thermal expansion and linear thermal expansion coefficient are measured by separately preparing a substance identified by electron diffraction (crystalline fibrous substance existing in the insulating coating), or using the literature value if available. It may be calculated.
- the volumetric coefficient of thermal expansion and linear thermal expansion coefficient of the crystalline fibrous substance in the temperature range of 25 ° C. to 800 ° C. for example, the lattice constants at 25 ° C. and 800 ° C. were measured by a high-temperature X-ray diffractometer. You can ask for it.
- the content of the crystalline fibrous substance in the insulating film is preferably 1.0% by mass or more, more preferably 3.0% by mass or more.
- the content of the crystalline fibrous substance in the insulating film is preferably 50% by mass or less, more preferably 20% by mass or less.
- the insulating coating preferably contains a phosphate, a borate, a silicate, etc., in addition to a crystalline fibrous substance, and particularly contains a phosphate generally used as an insulating coating at present. Is preferable. Since phosphate has the property of absorbing moisture in the atmosphere, among Mg, Al, Ca, Ba, Sr, Zn, Ti, Nd, Mo, Cr, B, Ta, Cu and Mn, for the purpose of preventing this. It is preferable to contain one or more metal elements selected from the above.
- the insulating coating according to the present invention may be a chromium-containing insulating coating or a chromium-free insulating coating.
- the chromium-free insulating coating tends to have a lower tension than the chromium-containing insulating coating. Since the insulating coating according to the present invention can increase the tension by containing a crystalline fibrous substance with increased orientation, the present invention is preferably applied to the insulating coating containing no chromium.
- the tension applied to the steel sheet by the insulating film is the tension applied to the steel sheet after masking with adhesive tape so that the insulating film on one surface of the sample is not removed and then peeling off the insulating film on the other surface with alkali, acid, etc. Obtained from the amount of warpage (x). More specifically, it is calculated using the following (Equation 1).
- the Young's modulus of the steel sheet is 132 GPa in the rolling direction and 220 GPa in the direction perpendicular to the rolling.
- a preferable crystalline fibrous substance is mixed with an aqueous solution containing a phosphate and sufficiently dispersed by stirring to prepare a treatment liquid (coating liquid) for forming an insulating coating.
- a treatment liquid coating liquid
- the orientation of the crystalline fibrous material in the insulating film can be controlled mainly by adjusting the aspect ratio of the crystalline fibrous material, but more positively, the crystalline fibrous material can be controlled. In order to control the orientation, for example, the film thickness of the insulating film may be adjusted, or shear may be applied when the coating liquid is applied.
- the tension applied by the insulating film in the rolling direction of the steel sheet is preferably 10 MPa or more, more preferably 12 MPa or more. By increasing the tension, iron loss can be reduced, and noise when a transformer is used can be further reduced.
- the insulating coating according to the present invention has anisotropy in the tension applied to the steel sheet by the insulating coating.
- having anisotropy means that the ratio of the tension applied to the steel sheet in the rolling direction to the tension applied in the direction perpendicular to rolling (rolling direction / direction perpendicular to rolling) is 1.05 or more. means. The ratio is preferably 1.20 or more.
- the film thickness (d) of the insulating film is preferably 0.75 ⁇ m or more, and more preferably 1.1 ⁇ m or more from the viewpoint of interlayer insulation.
- the film thickness (d) of the insulating film is preferably 7.5 ⁇ m or less, more preferably 6.0 ⁇ m or less, from the viewpoint of space factor.
- the basis weight of the insulating film is preferably determined as appropriate so that the above film thickness can be achieved.
- one side is 2.0 g / m 2 or more and 15.0 g / m 2 or less, and in the case of the total of both sides, 4. 0 g / m 2 or more 30.0 g / m 2 or less.
- the total basis weight on both sides is 4.0 g / m 2 or more, it becomes easier to improve the interlayer insulation.
- the total basis weight on both sides is 30.0 g / m 2 or less, it becomes easy to suppress a decrease in the space factor.
- the total basis weight on both sides is more preferably 6.0 g / m 2 or more.
- the total basis weight on both sides is more preferably 24.0 g / m 2 or less.
- Example 1 By mass%, Si: 3.25%, C: 0.04%, Mn: 0.08%, S: 0.002%, sol.
- a silicon steel plate slab containing Al: 0.015%, N: 0.006%, Cu: 0.05%, Sb: 0.01% is heated at 1150 ° C. for 20 minutes and then hot-rolled to 2.4 mm. It was made into a hot-rolled plate with the same thickness. The hot-rolled plate was annealed at 1000 ° C. for 1 minute and then cold-rolled to obtain a cold-rolled plate having a final plate thickness of 0.27 mm.
- a steel sheet having a size of 400 mm in the rolling direction ⁇ 100 mm in the direction perpendicular to the rolling direction was sampled and heated in a laboratory from room temperature to 820 ° C. at a heating rate of 80 ° C./s to create a wet atmosphere (50 vol% H 2). , 50 vol% N 2 , dew point 60 ° C.), and primary recrystallization annealing was performed at 820 ° C. for 60 seconds.
- an annealing separator in which 5 parts by mass of TiO 2 was mixed with 100 parts by mass of MgO was made into a water slurry, and then applied and dried.
- This steel sheet is heated between 300 ° C. and 800 ° C. for 100 hours, then heated to 1200 ° C. at 50 ° C./hr, and annealed at 1200 ° C. for 5 hours.
- a steel plate with an undercoat was prepared.
- the aqueous solution obtained by mixing 100 parts by mass of the first aluminum phosphate aqueous solution in terms of solid content, 50 parts by mass of colloidal silica in terms of SiO 2 solid content, and cordierite as shown in Table 2 is diluted with pure water.
- a coating liquid adjusted to a specific gravity of 1.20 was prepared (Note that No. 1 was not mixed with colloid).
- the coating liquid was applied to the steel sheet prepared above with a roll coater so that the total weight of both sides of the steel sheet after drying was 7.0 g / m 2.
- the a-axis length and the c-axis length of the primary particles were variously changed as shown in Table 2 by variously changing the synthesis conditions.
- the linear thermal expansion coefficient of each cordierite from 25 ° C to 800 ° C is 2.9 x 10-6 / K (a-axis direction) and -1.0 x 10-6 / K (c-axis direction).
- the coefficient of thermal expansion from 25 ° C. to 800 ° C. was 4.8 ⁇ 10-6 / K.
- the dispersed state of the cordierite in the insulating coating of the sample thus obtained was confirmed by observing the reflected electron beam image of SEM on the processed cross section by FIB, and rolling in the rolling direction cross section of the cordierite in the insulating coating.
- direction length (L RD) and perpendicular to the rolling direction length in the direction perpendicular to the rolling direction cross-section ratio (L TD) (L RD / L TD), a plate thickness direction length in the direction perpendicular to the rolling direction cross-section (L ND) were measured.
- the film thickness (d) of the insulating film was 1.6 ⁇ m.
- the tension (the tension applied to the steel plate in each of the rolling direction and the rolling perpendicular direction) is the steel plate for measuring the tension in the rolling direction from the sample (rolling direction 280 mm, rolling perpendicular direction 30 mm) and the steel plate for measuring the tension in the rolling perpendicular direction (rolling direction 280 mm, rolling perpendicular direction 30 mm) rolling direction 30 mm, cut out perpendicular to the rolling direction 100 mm), stress relief annealing (800 ° C., 2 hours, was subjected to N 2 atmosphere), single face was masked with adhesive tape so that the insulating coating of one surface is not removed The insulating film was removed by immersing it in a 25 mass% NaOH aqueous solution at 110 ° C., and the amount of warpage was measured for each of the steel plate for measuring tension in the rolling direction and the steel plate for measuring tension in the direction perpendicular to rolling.
- the adhesion of the coating film was evaluated by observing the length of the region where the insulating coating was peeled off when the sample was sheared in the rolling direction. At the length of 20 mm at the end of the sample after shearing, the length in the direction perpendicular to rolling where the insulating film was peeled off from the sheared end was measured by 50 times SEM observation, and when the maximum value was 100 ⁇ m or less, it adhered. When the property was good and the thickness was more than 100 ⁇ m, the adhesion was considered to be poor.
- the magnetic properties (iron loss (W 17/50 )) are such that the sample is sheared in the direction perpendicular to rolling 30 mm ⁇ rolling direction 280 mm by the method specified in JIS C 2550, and strain relief annealing (800 ° C, 2 hours, N 2). The measurement was carried out using the one subjected to the atmosphere).
- the magnetic flux density (B 8 ) of each sample was 1.94 T.
- the bending peeling diameter when a sample cut out in the direction perpendicular to rolling x 30 mm in the rolling direction x 280 mm in rolling direction is wound around a round bar having a diameter of 60 mm and bent back 180 °, the presence or absence of peeling of the insulating coating is visually investigated.
- the same evaluation was performed while reducing the diameter of the round bar at intervals of 5 mm, and the minimum diameter (bending peeling diameter) at which the insulating coating did not peel off visually was evaluated. In this evaluation, it was judged that the smaller the bending peeling diameter was, the better the film adhesion was, and the bending peeling diameter of 30 mm or less was considered to be good.
- Example 2 By mass%, Si: 3.25%, C: 0.04%, Mn: 0.08%, S: 0.002%, sol.
- a silicon steel plate slab containing Al: 0.015%, N: 0.006%, Cu: 0.05%, Sb: 0.01% is heated at 1150 ° C. for 20 minutes and then hot-rolled to 2.2 mm. It was made into a hot-rolled plate with the same thickness. The hot-rolled plate was annealed at 1000 ° C. for 1 minute and then cold-rolled to obtain a cold-rolled plate having a final plate thickness of 0.23 mm. Subsequently, the temperature was raised from room temperature to 820 ° C.
- a steel sheet having a size of 400 mm in the rolling direction ⁇ 100 mm in the direction perpendicular to the rolling direction was sampled, and an annealing separator in which 10 parts by mass of TiO 2 was mixed with 100 parts by mass of MgO was added to water. After making it into a slurry, it was applied and dried. The temperature of this steel sheet is raised between 300 ° C. and 800 ° C. over 100 hours, then the temperature is raised to 1200 ° C. at 50 ° C./hr, and the final finish is annealed at 1200 ° C. for 5 hours. A steel plate with a coating was prepared.
- the mixed aqueous solution as shown in Table 3 was diluted with pure water to prepare a coating liquid adjusted to a specific gravity of 1.25, and after baking with a roll coater, the film thickness (d) of the insulating coating shown in Table 4 was obtained. It was applied to the steel plate so as to be.
- the dispersed state of the crystalline fibrous substance (Phase 2) in the insulating coating of the sample thus obtained was confirmed by observing the SEM backscattered electron beam image on the processed cross section by FIB, and the crystals in the insulating coating.
- the directional length ( LND ) was measured.
- the tension, the adhesion of the coating film, the magnetic properties (iron loss (W 17/50 )), and the bending peel diameter were determined in the same manner as in Example 1.
- the magnetic flux density (B 8 ) of each sample was 1.92 T.
- cordierite (2MgO ⁇ 2Al 2 O 3 ⁇ 5SiO 2), Al 2 TiO 5, LaSrAlO 4 is a substance known to have anisotropy in linear thermal expansion coefficient.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Soft Magnetic Materials (AREA)
Abstract
Description
[1]電磁鋼板の表面に結晶性の繊維状物質を含有する絶縁被膜を有し、前記絶縁被膜中での前記結晶性の繊維状物質の圧延方向断面における圧延方向長さ(LRD)と圧延直角方向断面における圧延直角方向長さ(LTD)の比(LRD/LTD)が1.5以上50.0以下である、絶縁被膜付き電磁鋼板。
[2]前記絶縁被膜中での前記結晶性の繊維状物質の圧延直角方向断面における板厚方向長さ(LND)と絶縁被膜の膜厚(d)の比(LND/d)が0.2以上2.0以下である、[1]に記載の絶縁被膜付き電磁鋼板。
[3]前記結晶性の繊維状物質の25℃から800℃の温度範囲における体積熱膨張率が30×10-6/K以下である、[1]または[2]に記載の絶縁被膜付き電磁鋼板。
[4]前記結晶性の繊維状物質の25℃から800℃の温度範囲における線熱膨張率が異方性を有する、[1]~[3]のいずれかに記載の絶縁被膜付き電磁鋼板。
[5]前記絶縁被膜が、Mg、Al、Ca、Ba、Sr、Zn、Ti、Nd、Mo、Cr、B、Ta、Cu、Mnのうちから選ばれる金属元素を1種もしくは2種以上含むリン酸塩を含有する、[1]~[4]のいずれかに記載の絶縁被膜付き電磁鋼板。
公知の方法で製造された板厚:0.20mmの仕上焼鈍済みの方向性電磁鋼板から、圧延方向300mm×圧延直角方向100mmの大きさの鋼板をせん断により切り出し、未反応の焼鈍分離剤を除去した後、歪取焼鈍(800℃、2時間、N2雰囲気)を施した。鋼板の表面にはフォルステライトを主体とする被膜が形成していた。次に、5質量%リン酸水溶液で軽酸洗した。その後、前記軽酸洗後の鋼板に対して、以下のようにして絶縁被膜を形成した。
(従来例2)特開平9-78253号公報の実施例の絶縁被膜を前記文献に記載のとおり施した。なお、絶縁被膜の目付量は、鋼板両面合計の乾燥後目付量で9g/m2とした。
(発明例)第一リン酸マグネシウム水溶液を固形分換算で100質量部、コロイド状シリカをSiO2固形分換算で50質量部、コーディエライトを10質量部混合した水溶液を純水で希釈して比重1.20に調整した絶縁被膜形成用処理液(コート液)を作製した。前記コート液を、鋼板両面合計の乾燥後目付量で9g/m2となるようにロールコーターにて鋼板表面に塗布した。コーディエライトの一次粒子は六角柱状であり、a軸長さ0.8μm、c軸長さ4.5μmであった。また、前記コーディエライトの25℃から800℃までの温度範囲における線熱膨張率は、2.9×10-6/K(a軸方向)、-1.0×10-6/K(c軸方向)、25℃から800℃までの温度範囲における体積熱膨張率は4.8×10-6/Kであった。次に、乾燥炉に装入し、300℃で、1分間乾燥し、その後、850℃、30秒間、N2:100vol%雰囲気の条件で焼付を実施して鋼板表面に絶縁被膜を形成した。
Cは、ゴス方位結晶粒の発生に有用な成分であり、かかる作用を有効に発揮させるためには、Cを0.001%以上含有させることが好ましい。一方、C含有量が0.10%を超えると脱炭焼鈍によっても脱炭不良を起こす場合がある。したがって、C含有量は0.001~0.10%の範囲が好ましい。
Siは、電気抵抗を高めて鉄損を低下させるとともに、鉄のBCC組織を安定化させて高温の熱処理を可能とするために必要な成分であり、Si含有量は1.0%以上とすることが好ましい。一方、Si含有量が5.0%を超えると通常の冷間圧延が困難となる場合がある。したがって、Si含有量は1.0~5.0%の範囲が好ましい。Si含有量は2.0~5.0%の範囲がより好ましい。
Mnは、鋼の熱間脆性の改善に有効に寄与するだけでなく、SやSeが混在している場合には、MnSやMnSe等の析出物を形成し結晶粒成長の抑制剤としての機能を発揮する。かかる機能を有効に発揮するためには、Mn含有量は0.01%以上とすることが好ましい。一方、Mn含有量が1.0%を超えるとMnSe等の析出物の粒径が粗大化してインヒビターとしての効果が失われる場合がある。したがって、Mn含有量は0.01~1.0%の範囲が好ましい。
Alは、鋼中でAlNを形成して分散第二相としてインヒビターの作用をする有用成分であるので、sol.Alとして0.003%以上含有することが好ましい。一方、Al含有量がsol.Alとして0.050%を超えるとAlNが粗大に析出してインヒビターとしての作用が失われる場合がある。したがって、Al含有量はsol.Alとして0.003~0.050%の範囲が好ましい。
NもAlと同様にAlNを形成するために必要な成分であるので、0.001%以上含有することが好ましい。一方、0.020%を超えてNを含有するとスラブ加熱時にふくれ等を生じる場合がある。したがって、N含有量は0.001~0.020%の範囲が好ましい。
S、Seは、MnやCuと結合してMnSe、MnS、Cu2-xSe、Cu2-xSを形成し鋼中の分散第二相としてインヒビターの作用を発揮する有用成分である。有用な添加効果を得るためには、これらS、Seの合計の含有量を0.001%以上とすることが好ましい。一方、S、Seの合計の含有量が0.05%を超える場合はスラブ加熱時の固溶が不完全となるだけでなく、製品表面の欠陥の原因ともなる場合がある。したがって、S、Seの含有量は、SまたはSeの1種を含有する場合、SとSeの2種を含有する場合のいずれも合計で0.001~0.05%の範囲が好ましい。
ここで鋼板ヤング率は、圧延方向の場合132GPa、圧延直角方向の場合220GPaとする。
質量%で、Si:3.25%、C:0.04%、Mn:0.08%、S:0.002%、sol.Al:0.015%、N:0.006%、Cu:0.05%、Sb:0.01%を含有する珪素鋼板スラブを1150℃、20分加熱後、熱間圧延して2.4mmの板厚の熱延板とした。前記熱延板に、1000℃、1分間の焼鈍を施した後、冷間圧延により0.27mmの最終板厚の冷延板とした。得られた冷延板から、圧延方向400mm×圧延直角方向100mmサイズの鋼板を採取し、ラボにて室温から820℃まで加熱速度80℃/sにて昇温し、湿潤雰囲気(50vol%H2,50vol%N2、露点60℃)下で、820℃、60秒の一次再結晶焼鈍をおこなった。引き続き100質量部のMgOに対して、TiO2を5質量部混合した焼鈍分離剤を水スラリ状にしてから塗布、乾燥した。この鋼板を300℃から800℃間を100時間かけて昇温させた後、1200℃まで50℃/hrで昇温させ、1200℃で5時間焼鈍する最終仕上げ焼鈍をおこないフォルステライトを主体とする下地被膜をもつ鋼板を準備した。
質量%で、Si:3.25%、C:0.04%、Mn:0.08%、S:0.002%、sol.Al:0.015%、N:0.006%、Cu:0.05%、Sb:0.01%を含有する珪素鋼板スラブを1150℃、20分加熱後、熱間圧延して2.2mmの板厚の熱延板とした。前記熱延板に、1000℃、1分間の焼鈍を施した後、冷間圧延により0.23mmの最終板厚の冷延板とした。引き続いて室温から820℃まで加熱速度50℃/sにて昇温し、湿潤雰囲気(50vol%H2,50vol%N2、露点60℃)下で820℃、60秒の一次再結晶焼鈍をおこなった。
Claims (5)
- 電磁鋼板の表面に結晶性の繊維状物質を含有する絶縁被膜を有し、前記絶縁被膜中での前記結晶性の繊維状物質の圧延方向断面における圧延方向長さ(LRD)と圧延直角方向断面における圧延直角方向長さ(LTD)の比(LRD/LTD)が1.5以上50.0以下である、絶縁被膜付き電磁鋼板。
- 前記絶縁被膜中での前記結晶性の繊維状物質の圧延直角方向断面における板厚方向長さ(LND)と絶縁被膜の膜厚(d)の比(LND/d)が0.2以上2.0以下である、請求項1に記載の絶縁被膜付き電磁鋼板。
- 前記結晶性の繊維状物質の25℃から800℃の温度範囲における体積熱膨張率が30×10-6/K以下である、請求項1または2に記載の絶縁被膜付き電磁鋼板。
- 前記結晶性の繊維状物質の25℃から800℃の温度範囲における線熱膨張率が異方性を有する、請求項1~3のいずれかに記載の絶縁被膜付き電磁鋼板。
- 前記絶縁被膜が、Mg、Al、Ca、Ba、Sr、Zn、Ti、Nd、Mo、Cr、B、Ta、Cu、Mnのうちから選ばれる金属元素を1種もしくは2種以上含むリン酸塩を含有する、請求項1~4のいずれかに記載の絶縁被膜付き電磁鋼板。
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202080072374.8A CN114555860B (zh) | 2019-10-31 | 2020-06-25 | 带有绝缘覆膜的电磁钢板 |
| CA3151419A CA3151419C (en) | 2019-10-31 | 2020-06-25 | Electrical steel sheet with insulating film |
| US17/769,061 US12104257B2 (en) | 2019-10-31 | 2020-06-25 | Electrical steel sheet with insulating film |
| KR1020227013527A KR102782011B1 (ko) | 2019-10-31 | 2020-06-25 | 절연 피막 부착 전자 강판 |
| EP20882529.9A EP4026930A4 (en) | 2019-10-31 | 2020-06-25 | ELECTROMAGNETIC STEEL SHEET WITH INSULATION COATING FILM |
| MX2022004763A MX2022004763A (es) | 2019-10-31 | 2020-06-25 | Chapa de acero electrico con pelicula aislante. |
| JP2020555935A JP6863534B1 (ja) | 2019-10-31 | 2020-06-25 | 絶縁被膜付き電磁鋼板 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019198433 | 2019-10-31 | ||
| JP2019-198433 | 2019-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2021084793A1 true WO2021084793A1 (ja) | 2021-05-06 |
Family
ID=75716151
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2020/024932 Ceased WO2021084793A1 (ja) | 2019-10-31 | 2020-06-25 | 絶縁被膜付き電磁鋼板 |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2021084793A1 (ja) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024214722A1 (ja) * | 2023-04-10 | 2024-10-17 | 日本製鉄株式会社 | MgO粉末、MgOスラリーおよびそれらの製造方法、並びに、方向性電磁鋼板の製造方法 |
| WO2024214723A1 (ja) * | 2023-04-10 | 2024-10-17 | 日本製鉄株式会社 | MgO粉末、MgOスラリーおよびそれらの製造方法、並びに、方向性電磁鋼板の製造方法 |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4839338A (ja) | 1971-09-27 | 1973-06-09 | ||
| JPS5079442A (ja) | 1973-11-17 | 1975-06-27 | ||
| JPH0867913A (ja) | 1994-08-24 | 1996-03-12 | Nippon Steel Corp | 鉄損の小さい珪素鋼板及びその製造法及び使用法 |
| JPH08239771A (ja) | 1995-03-02 | 1996-09-17 | Nippon Steel Corp | 高張力絶縁被膜を有する方向性電磁鋼板とその絶縁被膜形成方法 |
| JPH0978253A (ja) | 1995-09-13 | 1997-03-25 | Nippon Steel Corp | 一方向性珪素鋼板の絶縁皮膜形成方法 |
| JPH09235679A (ja) * | 1996-02-29 | 1997-09-09 | Nippon Steel Corp | 低鉄損一方向性珪素鋼板の製造方法 |
| JP2001303261A (ja) | 2000-04-25 | 2001-10-31 | Kawasaki Steel Corp | 張力付与異方性被膜を有する低鉄損一方向性電磁鋼板 |
| WO2007136115A1 (ja) * | 2006-05-19 | 2007-11-29 | Nippon Steel Corporation | 高張力絶縁被膜を有する方向性電磁鋼板及びその絶縁被膜処理方法 |
| WO2010146821A1 (ja) * | 2009-06-17 | 2010-12-23 | 新日本製鐵株式会社 | 絶縁被膜を有する電磁鋼板及びその製造方法 |
| JP2012031498A (ja) * | 2010-06-29 | 2012-02-16 | Jfe Steel Corp | 方向性電磁鋼板およびその製造方法 |
| WO2018079845A1 (ja) * | 2016-10-31 | 2018-05-03 | 新日鐵住金株式会社 | 方向性電磁鋼板 |
| WO2018174275A1 (ja) * | 2017-03-23 | 2018-09-27 | 新日鐵住金株式会社 | 電磁鋼板 |
| JP2019021920A (ja) * | 2017-07-18 | 2019-02-07 | Jfeスチール株式会社 | 方向性電磁鋼板およびその製造方法 |
-
2020
- 2020-06-25 WO PCT/JP2020/024932 patent/WO2021084793A1/ja not_active Ceased
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4839338A (ja) | 1971-09-27 | 1973-06-09 | ||
| JPS5079442A (ja) | 1973-11-17 | 1975-06-27 | ||
| JPH0867913A (ja) | 1994-08-24 | 1996-03-12 | Nippon Steel Corp | 鉄損の小さい珪素鋼板及びその製造法及び使用法 |
| JPH08239771A (ja) | 1995-03-02 | 1996-09-17 | Nippon Steel Corp | 高張力絶縁被膜を有する方向性電磁鋼板とその絶縁被膜形成方法 |
| JPH0978253A (ja) | 1995-09-13 | 1997-03-25 | Nippon Steel Corp | 一方向性珪素鋼板の絶縁皮膜形成方法 |
| JPH09235679A (ja) * | 1996-02-29 | 1997-09-09 | Nippon Steel Corp | 低鉄損一方向性珪素鋼板の製造方法 |
| JP2001303261A (ja) | 2000-04-25 | 2001-10-31 | Kawasaki Steel Corp | 張力付与異方性被膜を有する低鉄損一方向性電磁鋼板 |
| WO2007136115A1 (ja) * | 2006-05-19 | 2007-11-29 | Nippon Steel Corporation | 高張力絶縁被膜を有する方向性電磁鋼板及びその絶縁被膜処理方法 |
| WO2010146821A1 (ja) * | 2009-06-17 | 2010-12-23 | 新日本製鐵株式会社 | 絶縁被膜を有する電磁鋼板及びその製造方法 |
| JP2012031498A (ja) * | 2010-06-29 | 2012-02-16 | Jfe Steel Corp | 方向性電磁鋼板およびその製造方法 |
| WO2018079845A1 (ja) * | 2016-10-31 | 2018-05-03 | 新日鐵住金株式会社 | 方向性電磁鋼板 |
| WO2018174275A1 (ja) * | 2017-03-23 | 2018-09-27 | 新日鐵住金株式会社 | 電磁鋼板 |
| JP2019021920A (ja) * | 2017-07-18 | 2019-02-07 | Jfeスチール株式会社 | 方向性電磁鋼板およびその製造方法 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024214722A1 (ja) * | 2023-04-10 | 2024-10-17 | 日本製鉄株式会社 | MgO粉末、MgOスラリーおよびそれらの製造方法、並びに、方向性電磁鋼板の製造方法 |
| JPWO2024214722A1 (ja) * | 2023-04-10 | 2024-10-17 | ||
| WO2024214723A1 (ja) * | 2023-04-10 | 2024-10-17 | 日本製鉄株式会社 | MgO粉末、MgOスラリーおよびそれらの製造方法、並びに、方向性電磁鋼板の製造方法 |
| JPWO2024214723A1 (ja) * | 2023-04-10 | 2024-10-17 | ||
| JP7723335B2 (ja) | 2023-04-10 | 2025-08-14 | 日本製鉄株式会社 | MgO粉末、MgOスラリーおよびそれらの製造方法、並びに、方向性電磁鋼板の製造方法 |
| JP7723336B2 (ja) | 2023-04-10 | 2025-08-14 | 日本製鉄株式会社 | MgO粉末、MgOスラリーおよびそれらの製造方法、並びに、方向性電磁鋼板の製造方法 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6904499B1 (ja) | 被膜形成方法および絶縁被膜付き電磁鋼板の製造方法 | |
| JP2021073368A (ja) | 絶縁被膜付き電磁鋼板およびその製造方法 | |
| JP6863534B1 (ja) | 絶縁被膜付き電磁鋼板 | |
| WO2022250163A1 (ja) | 方向性電磁鋼板 | |
| JP6981510B2 (ja) | 絶縁被膜付き方向性電磁鋼板 | |
| WO2021084793A1 (ja) | 絶縁被膜付き電磁鋼板 | |
| KR20210110681A (ko) | 포르스테라이트 피막을 갖지 않는 절연 피막 밀착성이 우수한 방향성 전자 강판 | |
| JP7265186B2 (ja) | 方向性電磁鋼板及びその製造方法 | |
| JP6645632B1 (ja) | 絶縁被膜付き電磁鋼板およびその製造方法、前記電磁鋼板を用いてなる変圧器の鉄心、変圧器ならびに変圧器の誘電損失の低減方法 | |
| CN115151681B (zh) | 带绝缘被膜的方向性电磁钢板和其制造方法 | |
| JP6819654B2 (ja) | 方向性電磁鋼板およびその製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| ENP | Entry into the national phase |
Ref document number: 2020555935 Country of ref document: JP Kind code of ref document: A |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20882529 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 3151419 Country of ref document: CA |
|
| ENP | Entry into the national phase |
Ref document number: 2020882529 Country of ref document: EP Effective date: 20220405 |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 17769061 Country of ref document: US |
|
| ENP | Entry into the national phase |
Ref document number: 20227013527 Country of ref document: KR Kind code of ref document: A |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |