WO2014104762A1 - 방향성 전기강판 및 그 제조방법 - Google Patents
방향성 전기강판 및 그 제조방법 Download PDFInfo
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- WO2014104762A1 WO2014104762A1 PCT/KR2013/012224 KR2013012224W WO2014104762A1 WO 2014104762 A1 WO2014104762 A1 WO 2014104762A1 KR 2013012224 W KR2013012224 W KR 2013012224W WO 2014104762 A1 WO2014104762 A1 WO 2014104762A1
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- electrical steel
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
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- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/0236—Cold rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0257—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with diffusion of elements, e.g. decarburising, nitriding
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
- C21D8/1283—Application of a separating or insulating coating
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/02—Pretreatment of the material to be coated
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
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- 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
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/80—After-treatment
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- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
- C23F11/02—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in air or gases by adding vapour phase inhibitors
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
Definitions
- the present invention relates to a grain-oriented electrical steel sheet and a method for manufacturing the same, and more particularly, by intentionally preventing the base coating layer produced through the chemical reaction of the oxide layer produced in the decarbonization process and the MgO slurry used as a fusion inhibitor of the coil product
- the present invention relates to a grain-oriented electrical steel sheet and a method of manufacturing the same wherein the surface pinning effect that causes magnetic deterioration is eliminated.
- a grain-oriented electrical steel sheet contains 3.1% Si and has a grain structure in which the grain orientation is aligned in the (110) [001] direction. This product has very good magnetic properties in the rolling direction. Used as iron core materials for transformers, electric motors, generators and other electronic devices.
- directional electrical steel excellent insulation coating should basically have uniform color without defect in appearance, but it is mainly used to improve electrical insulation and enhance film adhesion by incorporating various technologies to provide functionality. It was.
- Techniques for removing the base coating include a method of forcibly removing a product already formed with the base coating with sulfuric acid or hydrochloric acid as in the conventional art, which is well described in Japanese Patent 1985-076603.
- complicated processes such as chemical polishing or electropolishing should be involved, and the treatment cost offsets the performance improvement of the product, especially with the difficulty of keeping the acid concentration constant during the process to remove the surface with a certain thickness.
- the surface roughness of the obtained product is too smooth to insulate the coating on the product, thereby securing adhesion as well as very poor insulation without using a physical / chemical vapor deposition method.
- Al2O3 powder does not form the base coating itself. (Decarbonation annealing)-(Pickling)-(Al2O3 coating)-(High temperature annealing)-(Oxidation film formation by preannealing)-(Tension coating) Coating), and Al2O3 does not react with the oxide layer present on the material surface.
- Another glassless technique is to remove the base coating by adding chloride, which is (decarbon annealing)-(MgO + chloride powder application)-(hot annealing)-(pickling)-(tension coating)
- chloride which is (decarbon annealing)-(MgO + chloride powder application)-(hot annealing)-(pickling)-(tension coating)
- MgO is used as a main component of the fusion preventive agent, ie, annealing separator, between coil plates at high temperature annealing, as described in US Pat. No.
- the present invention provides a base coating free type having a very low iron loss by removing a pinning point, which is a main factor limiting magnetic movement in a material by allowing a base layer to be spontaneously removed during a high temperature annealing process. It is intended to provide an electrical steel sheet and a method of manufacturing the same.
- An annealing separator includes MgO, oxychloride material and sulfate-based antioxidant.
- the oxychloride material may be antimony oxychloride (SbOCl) or bismuth oxychloride (BiOCl).
- the sulfate-based antioxidant may be at least one selected from antimony-based (Sb 2 (SO 4) 3), strontium-based (SrSO 4) or barium-based (BaSO 4).
- the oxychloride material may be included in a weight ratio of 10 to 20 with respect to MgO: 100 to 200
- the sulfate-based antioxidant may be included in a weight ratio of 1 to 5 with respect to MgO: 100 to 200.
- Method for producing a grain-oriented electrical steel sheet the step of hot rolling a steel slab to produce a hot rolled steel sheet; Cold rolling the hot rolled steel sheet to produce a cold rolled steel sheet; Decarburizing annealing and nitriding annealing the cold rolled steel sheet; Applying an annealing separator including MgO, an oxychloride material and a sulfate-based antioxidant, and a glassless additive including water to the electrical steel sheet on which the decarburization annealing and nitriding annealing are completed, and finally performing high temperature annealing; Includes.
- the oxychloride material may be antimony oxychloride (SbOCl) or bismuth oxychloride (BiOCl).
- the sulfate-based antioxidant may be at least one selected from antimony (Sb 2 (SO 4) 3), strontium (SrSO 4), or barium (BaSO 4).
- the oxychloride material may be included in a weight ratio of 10 to 20 with respect to MgO: 100 to 200
- the sulfate-based antioxidant may be included in a weight ratio of 1 to 5 with respect to MgO: 100 to 200.
- the amount of SiO 2 formed on the surface of the electrical steel sheet after the decarburization annealing and nitriding annealing may be formed 2 to 5 times the amount of Fe 2 SiO 4.
- the decarburization and nitride annealing process may be carried out in a dew point range of 35 ⁇ 55 °C.
- the activation degree of the MgO may be 400 to 3000 seconds.
- the temperature increase rate may be performed at a temperature range of 700 to 950 ° C at 18 to 75 ° C / hr, and at a temperature range of 950 to 1200 ° C at 10 to 15 ° C / hr.
- the decarburization and annealing temperature may be 800 to 950 ° C.
- the glassless additive may be applied at 5-8 g / m 2 .
- the steel slab is in weight%, Sn: 0.03 to 0.07%, Sb: 0.01 to 0.05%, P: 0.01 to 0.05%, the balance includes impurities such as Fe and other unavoidable addition, P + 0.5 Sb: 0.0370 ⁇ 0.0630% can be satisfied.
- the grain-oriented electrical steel sheet according to an embodiment of the present invention in weight%, Sn: 0.03 to 0.07%, Sb: 0.01 to 0.05%, P: 0.01 to 0.05%, the balance includes Fe and other unavoidable impurities
- the amount of SiO 2 formed on the surface of the steel sheet in which the decarburization annealing and nitriding annealing is completed is performed, and the grain-oriented electrical steel sheet is 2 to 5 times the amount of Fe 2 SiO 4.
- the glassless additive including an annealing separator and water containing MgO, an oxychloride material and a sulfate-based antioxidant in the decarburizing annealing and nitriding annealing is completed. It is a grain-oriented electrical steel sheet coated and subjected to final high temperature annealing.
- the oxychloride material may be antimony oxychloride (SbOCl) or bismuth oxychloride (BiOCl).
- the sulfate-based antioxidant may be at least one selected from antimony (Sb 2 (SO 4) 3), strontium (SrSO 4), or barium (BaSO 4).
- the oxychloride material may be included in a weight ratio of 10 to 20 with respect to MgO: 100 to 200
- the sulfate-based antioxidant may be included in a weight ratio of 1 to 5 with respect to MgO: 100 to 200.
- the amount of SiO 2 formed on the surface of the electrical steel sheet after the decarburization annealing and nitriding annealing may be formed 2 to 5 times the amount of Fe 2 SiO 4.
- the decarburization and nitride annealing process may be carried out in a dew point range of 35 ⁇ 55 °C.
- the activation degree of the MgO may be 400 to 3000 seconds.
- the temperature increase rate may be performed at a temperature range of 700 to 950 ° C at 18 to 75 ° C / hr, and at a temperature range of 950 to 1200 ° C at 10 to 15 ° C / hr.
- the decarburization and annealing temperature may be 800 to 950 ° C.
- the glassless additive may be applied at 5-8 g / m 2 .
- the present invention it is possible to minimize the base coating layer generated through the chemical reaction of the oxide layer and the MgO slurry used as a fusion inhibitor of the coil inevitably generated during the decarbonization annealing process of the grain-oriented electrical steel sheet.
- MgO which is a main component of the annealing separator
- the activation degree of MgO which is a main component of the annealing separator
- oxychloride-based materials and sulfate-based antioxidants which are insoluble compounds of Fe-based oxides produced during slurry application and drying, are used.
- Embodiment according to the present invention is a means for achieving the above object, it is necessary to control the overall electrical steel sheet manufacturing process.
- the material used is by weight, Sn: 0.03 ⁇ 0.07% by weight, Sb: 0.01 ⁇ 0.05% by weight, P: 0.01 ⁇ 0.05% by weight, characterized in that it comprises essentially, Sn: 0.03 ⁇ 0.07% by weight , Sb: 0.01 ⁇ 0.05% by weight, P: 0.01 ⁇ 0.05% by weight of hot-rolled steel slab to prepare a hot rolled plate of 2.0 ⁇ 2.8 mm, and then hot rolled sheet after annealing and pickling 0.23 A cold rolled sheet having a thickness of 0.23 mm is produced by cold rolling to a thickness of mm.
- the temperature, atmosphere, dew point, etc. of the furnace are controlled to adjust the amount of oxide layer formed on the surface of the material so that SiO2 is 2 to 5 times Fe2SiO4. At this time, the dew point is controlled to 35 ⁇ 55 °C.
- a annealing separator consisting of water: 800
- the activation degree of the activated MgO used in the annealing separator was limited to 400 to 3000 seconds, and the oxychloride material in the form of an inorganic compound having an insoluble property in an aqueous solution was applied to an antimony or bismuth system. Can be.
- the sulfate-based material used as an antioxidant in the embodiment according to the present invention may be one or more of antimony-based, strontium-based or barium-based.
- each element contributes to the magnetic improvement of the grain-oriented electrical steel sheet by the following action.
- the component content in the examples according to the invention is by weight unless otherwise indicated.
- Sn can improve iron loss by increasing the number of secondary nuclei in the ⁇ 110 ⁇ ⁇ 001> orientation to reduce the size of the secondary grains.
- Sn also plays an important role in suppressing grain growth through segregation at grain boundaries, which compensates for the weakening of the grain growth inhibition effect as the AlN particles are coarsened and the Si content is increased.
- the Si content can be increased as well as the final thickness can be reduced without compromising the completeness of the ⁇ 110 ⁇ ⁇ 001> secondary recrystallized structure.
- the content of Sn is preferably 0.03 to 0.07% by weight within the range in which the content of other components is appropriately adjusted. That is, when controlling the content range of Sn to 0.03 to 0.07% by weight as described above, it is possible to confirm the discontinuous and significant iron loss reduction effect that could not be predicted in the past, so the content of Sn in the embodiment according to the present invention is It is limited to a range.
- Sb segregates at grain boundaries and acts to suppress excessive growth of primary recrystallized grains.
- Sb By adding Sb to suppress grain growth in the first recrystallization step, the non-uniformity of the first recrystallized grain size along the thickness direction of the plate is removed, and at the same time, the secondary recrystallization is stably formed to make the grain-oriented electrical steel sheet with better magnetism. Can be.
- the effect of such Sb can be greatly improved when the content of Sb by 0.01 to 0.05% by weight, unpredictable in the prior art.
- Sb segregates at grain boundaries to inhibit excessive growth of primary recrystallized grains, but if it is 0.01 wt% or less, the action is difficult to be exhibited properly. If 0.05 wt% or more is contained, the size of primary recrystallized grains is too small. In the embodiment according to the present invention, the content of Sb is limited to the above range because the secondary recrystallization start temperature is lowered to deteriorate the magnetic properties or the inhibition force against grain growth may be too large to form secondary recrystallization.
- P promotes the growth of primary recrystallized grains in oriented electrical steel sheets of low temperature heating method, thereby increasing the secondary recrystallization temperature to increase the degree of integration of ⁇ 110 ⁇ ⁇ 001> orientation in the final product. If the primary recrystallization is too large, the secondary recrystallization becomes unstable, but as long as the secondary recrystallization occurs, it is advantageous for the magnet to have a large primary recrystallized grain to increase the secondary recrystallization temperature. On the other hand, P not only lowers the iron loss of the final product by increasing the number of grains having the ⁇ 110 ⁇ ⁇ 001> orientation in the primary recrystallized steel sheet, but also strongly develops the ⁇ 111 ⁇ ⁇ 112> texture in the primary recrystallized sheet.
- the magnetic flux density is also increased.
- P has a function of reinforcing the suppression force by segregating at the grain boundary to a high temperature of about 1000 ° C. during secondary recrystallization annealing, to delay decomposition of the precipitate.
- the content of P is limited to 0.01 to 0.05% by weight, a remarkable effect that can not be predicted at all in the conventional literature can be obtained.
- the content of P is limited to the above range.
- the iron loss was further improved by controlling the content of P + 0.5Sb in the above-mentioned range in addition to the case of adding the various elements.
- the elements are usually added together to produce a synergistic effect, when the synergistic effect is discontinuously maximized compared to other numerical ranges when it meets the above formula range. Therefore, in the embodiment according to the present invention, in addition to the respective component content, the P + 0.5 Sb is limited to the above range.
- Fe-Si alloys such as grain-oriented electrical steel sheets, improve high temperature oxidation resistance.
- Sn and Sb are included in the steel to control the quality of the oxide layer which plays the most important role in the base coating pre-process as well as the meaning as a metallurgical element for improving the magnetic properties of the grain-oriented electrical steel sheet.
- Slab is used as the starting material.
- the above-mentioned steel slab is hot rolled to make a hot rolled sheet of 2.0 to 2.8 mm, and then cold rolled to a final thickness of 0.23 mm after annealing and pickling.
- the cold rolled steel sheet is then subjected to decarbonization annealing and recrystallization annealing, which will be described in detail.
- the cold rolled steel sheet is subjected to decarburization and nitride annealing in a mixed gas atmosphere of ammonia + hydrogen + nitrogen in order to remove carbon contained in the steel and to generate an inhibitor for appropriately controlling secondary recrystallization growth during high temperature annealing.
- Rough The characteristic of this process is that the furnace temperature is set to 800 ⁇ 950 °C in a humid atmosphere. If it is lower than 800 °C, sufficient decarbonization effect does not occur, and the grains remain fine, which is undesirable during secondary recrystallization. There is a fear that the orientation crystals may grow, and if it is higher than 950 ° C., the primary recrystallized grains may be excessively grown. Therefore, the furnace temperature during decarburization and annealing in the embodiment according to the present invention is limited to 800 to 950 ° C. do.
- the oxide layer so as to be about 2 to 4 ° C. to be about 2 to 4 ° C. lower than that of the component system containing no Sn, Sb, or P, which is more advantageous for controlling grain orientation and improving iron loss of the final product.
- an oxide layer is inevitably generated on the surface of the decarburization and annealing process, and in the conventional oriented electrical steel sheet manufacturing process, an oxide layer and an MgO slurry (aqueous solution in which MgO is dispersed in water) are produced.
- a base coating Mg 2 SiO 4
- the resulting forsterite layer i.e., the base coating, has been known to impart insulation to the material with the effect of preventing fusion between the plate and the plate of the grain-oriented electrical steel coil and tensioning the plate to reduce iron loss.
- the Si with the highest oxygen affinity in the steel reacts with the oxygen supplied from the steam in the furnace to form SiO2 on the surface first.
- Fe-based oxides are produced by penetration into steel.
- the SiO 2 thus formed forms a base coating through the following chemical reaction formula.
- the base coating layer which ultimately prevents the movement of the material is formed to the minimum at the front end of the high temperature annealing process, the rear end is removed so that a large amount of SiO 2 is formed on the material surface as in the conventional manufacturing method. There is no need to react with MgO to form a Payalite. In this case, it is advantageous to form a thin SiO2 layer on the surface of the material and to generate a very small amount of pallarite through the dew point, cracking temperature, and atmospheric gas control during the decarburization and sedimentation annealing processes.
- Fe-based oxides such as FeO, Fe 2 SiO 3, etc. are inevitably generated.
- the produced FeO and Fe2SiO3 basically do not react with glassless additives and remain on the surface of the material to form oxide hills of FeO (hereinafter referred to as Fe mound). In this case, the surface without the base coating is beautiful and glossy. You can't get good products.
- a change in the oxide layer composition was induced by changing the dew point temperature in the furnace through decarburization and annealing, and the amount of SiO 2 and payarite thus obtained was quantified through FT-IR.
- SiO2 is formed to be two times or more than five times of the payarite.
- a conventional glassless additive such as BiCl 3 was applied and mixed with MgO and water on a specimen in which the oxide layer of the material was adjusted and finally annealed in a coil shape.
- the primary cracking temperature was 700 °C and the secondary cracking temperature was 1200 °C
- the temperature raising condition was 18 ⁇ 75 °C / hr in the temperature range of 700 ⁇ 950 °C, and in the temperature range of 950 ⁇ 1200 °C. It was set to 10-15 degreeC / hr.
- the cracking time in 1200 degreeC was processed into 15 hours.
- the atmosphere was mixed with 25% nitrogen + 75% hydrogen up to 1200 ° C. After reaching 1200 ° C, it was maintained in a 100% hydrogen atmosphere and then cooled.
- the roughness and gloss improvement in the specimen treated as described above was superior to the conventional glassless system, but the beautiful surface properties of pickling and chemical polishing levels could not be obtained, and the magnetic improvement was also limited.
- the base coating was not completely removed and the residual material of the specimen was analyzed. As a result, it was found to be a spinel-based (MgO ⁇ Al 2 O 3) compound and a Fe-based oxide. In addition, when such residual material remained, the magnetic properties required by the low iron loss oriented electrical steel sheet could not be satisfied. Therefore, in the embodiment according to the present invention, in order to ultimately overcome the limitations of the conventional glassless type and to drastically improve the iron loss of the oriented electrical steel sheet, the study focused on the above-described deterioration material formation mechanism.
- the spinel oxide which is the first cause of the deterioration of the properties, is highly reactive with SiO 2 present on the surface as well as forming a base coating layer when the activation of MgO, the main component of the annealing coating agent, is high.
- the spinel-based composite oxide was generated by reacting with Al, which is a steel component present at the interface between the material and the material.
- MgO having various activation levels was prepared by artificially adjusting the activation degree of MgO.
- the activation degree of the MgO is defined as the ability of the MgO powder to cause a chemical reaction with other components, and measured by the time taken for MgO to completely neutralize a certain amount of citric acid solution.
- high activity is used in the case of MgO used as an annealing separator for oriented electrical steel sheet, and the activation degree is about 50 to 300 seconds.
- a high-temperature firing process other than MgO having a normal activation degree is performed.
- the activation degree of MgO is limited to 400 to 3000 seconds. If the activation degree is less than 400 seconds, the spinel oxide is left on the surface after high temperature annealing, such as conventional MgO, and more than 3000 seconds. In the large case, the activation degree is so weak that it does not react with the oxide layer present on the surface so that the base coating layer cannot be formed. Therefore, in the embodiment of the present invention, the activation degree of MgO is limited to 400 to 3000 seconds.
- the second reason for the deterioration of the magnetic properties is Fe-based oxides, which are limited in production by controlling the dew point and atmosphere in the furnace during Sn, Sb introduction, decarburization and sedimentation in steel as described above.
- the cause of Fe-based oxide formation is also related to the chemical reaction between the chloride used as the glassless additive and the aqueous solution used to disperse the annealing separator.
- BiCl3 which is well known as a chloride of a conventional glassless system, is coated with MgO in an aqueous solution on a specimen and subjected to a high temperature annealing, and the following chemical reaction occurs on the surface.
- an Fe-based oxide layer is already formed. Will form roots.
- the antimony oxychloride (SbOCl) additive which does not dissociate in the non-chlorinated aqueous solution of non-chlorinated BiCl3 or similar system in the embodiment according to the present invention, thereby inhibiting Fe-based oxides.
- This problem was solved by using antimony sulfate (Sb2 (SO4) 3) having no and Cl groups.
- MgO very fine gloss and roughness
- the activation is adjusted by annealing separator to produce a very good grain-oriented electrical steel sheet: antimony oxychloride (SbOCl): insoluble in aqueous solution: 10 ⁇ 20g and antimony sulfate (Sb2 (SO4) 3): 1 ⁇ 5g, after a mixture of water 800 ⁇ 1500g made in slurry form decarburization, chimjil is 5 ⁇ 8g / m 2 is applied to the surface of the material over the 300 to 700 Dry at ⁇ .
- SBOCl antimony oxychloride
- Sb2 (SO4) 3 1 ⁇ 5g
- chimjil is 5 ⁇ 8g / m 2 is applied to the surface of the material over the 300 to 700 Dry at ⁇ .
- the specimen thus prepared is made into a coil and subjected to high temperature annealing, and the temperature rising rate of the rapid heating rate section at the initial high temperature annealing is set at 18 to 75 ° C / hr, and the slow temperature rising rate considering the second recrystallization is 10 to 15 ° C. Set to / hr.
- the thermal decomposition of the glassless additive in the annealing separator in the first half of the high temperature annealing process occurs as follows in the vicinity of 280 ° C.
- the separated Cl gas diffuses back to the surface of the material rather than coming out of the coil by the pressure in the furnace, and forms FeCl2 at the interface between the material and the oxide layer.
- a base coating is formed on the outermost surface of the material by the reaction of MgO and SiO 2 near 900 ° C. by equation (5).
- FeCl2 formed at the interface between the material and the oxide layer starts to decompose around 1025 ⁇ 1100 ° C.
- the decomposed Cl2 gas escapes to the outermost surface of the material, thereby peeling the base coating formed thereon.
- the amount of chloride in the form of oxychloride which does not produce Fe-based oxides and does not inhibit iron loss during drying after slurry preparation is limited to 10-20 g based on MgO: 100-200 g added. . If the amount of chloride is less than 10g, there is a limit in improving the roughness and glossiness after high temperature annealing because Cl cannot be supplied enough to form sufficient FeCl2. In the embodiment according to the present invention, the amount of chloride is limited to 10 to 20 g for MgO: 100 to 200 g because the amount of MgO may be too much to interfere with the base coating formation itself, thereby affecting not only the surface but also metallurgical secondary recrystallization. do.
- antimony sulphate (SbOCl) and antimony sulfate (Sb2 (SO4) 3) are added to form a thin layer of forsterite resulting from MgO and SiO2 reactions.
- SbOCl antimony sulphate
- Sb2 (SO4) 3 antimony sulfate
- MgO the main component of annealing separator such as antimony oxychloride (SbOCl). Since too much amount may interfere with the base coating formation itself, the embodiment according to the present invention limits the amount of SbOCl and Sb2 (SO4) 3 added to the above range.
- Table 2 shows the variation of the oxide layer composition according to the dew point temperature in the furnace during decarburization and annealing after cold rolling to 0.23mm thickness using Sn and Sb-added steel slabs (Sample No. 10 component system) proposed in Table 1.
- the base coating removal ability was compared through the difference in roughness and gloss.
- the cracking temperature of the furnace was 875 ° C., mixed with 75% of hydrogen and 25% of nitrogen, and 1% of dry ammonia gas, and maintained for 180 seconds.
- the total amount of oxygen formed on the surface of the material and the composition of the oxide layer are greatly affected by the change in the furnace dew point temperature.
- Table 2 when the amount of oxide layer formed on the surface was adjusted to more than 2 times and less than 5 times SiO2, Fe2SiO4 had the best surface roughness and glossiness. At 5 times or more, Fe2SiO4 formation was so weak that the base coating itself was very poor, resulting in too much residual material on the surface of the material. This is because the excessively produced FeO, Fe2SiO3 basically does not react to the glassless additives and adheres directly to the surface of the material to form Femound defects. It can be seen.
- MgO was prepared based on 100 g of water and 1000 g of annealing separator. As shown in Table 3, the use of highly active MgO and highly oxidizing BiCl3, and similar chlorides, rather than chlorides of moderately active MgO, does not dissociate in aqueous solution, thereby inhibiting Fe oxides inherently. In the specimen to which antimony oxychloride (SbOCl) additive and antimony sulfate (Sb2 (SO4) 3) having no Cl group were applied, a grain-oriented electrical steel sheet having excellent roughness and gloss and very low iron loss was obtained.
- SBOCl antimony oxychloride
- SO4 antimony sulfate
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Abstract
Description
시편번호 | Sn함량(중량%) | P함량(중량%) | Sb함량(중량%) | Glassless첨가제 | 조도(Ra: ㎛) | 광택도(index) |
1 | 0 | 0 | 0 | MgCl2 | 0.65 | 54 |
CaCl2 | 0.58 | 67 | ||||
2 | 0 | 0 | 0.015 | MgCl2 | 0.55 | 72 |
CaCl2 | 0.67 | 48 | ||||
3 | 0 | 0.02 | 0 | MgCl2 | 0.74 | 66 |
CaCl2 | 0.62 | 59 | ||||
4 | 0 | 0.035 | 0.015 | MgCl2 | 0.59 | 62 |
CaCl2 | 0.60 | 57 | ||||
5 | 0.01 | 0.035 | 0.025 | MgCl2 | 0.57 | 82 |
CaCl2 | 0.61 | 48 | ||||
6 | 0.03 | 0.035 | 0.025 | MgCl2 | 0.48 | 103 |
CaCl2 | 0.45 | 107 | ||||
7 | 0.04 | 0.035 | 0.025 | MgCl2 | 0.49 | 95 |
CaCl2 | 0.50 | 89 | ||||
8 | 0.05 | 0.02 | 0.035 | MgCl2 | 0.46 | 106 |
CaCl2 | 0.47 | 109 | ||||
9 | 0.05 | 0.035 | 0.045 | MgCl2 | 0.54 | 97 |
CaCl2 | 0.51 | 98 | ||||
10 | 0.06 | 0.35 | 0.025 | MgCl2 | 0.43 | 115 |
CaCl2 | 0.42 | 121 |
시편번호 | 노점온도 | 총산소량(ppm) | SiO2/FeO | 글라스리스첨가제 | 조도(Ra: ㎛) | 광택도(index) |
1 | 35 | 340 | 7.2 | MgCl2 | 0.32 | 114 |
2 | CaCl2 | 0.34 | 120 | |||
3 | BiCl3 | 0.31 | 126 | |||
4 | SbCl3 | 0.31 | 132 | |||
5 | 45 | 480 | 4.8 | MgCl2 | 0.32 | 177 |
6 | CaCl2 | 0.34 | 172 | |||
7 | BiCl3 | 0.31 | 191 | |||
8 | SbCl3 | 0.31 | 194 | |||
9 | 55 | 630 | 2.3 | MgCl2 | 0.39 | 160 |
10 | CaCl2 | 0.38 | 158 | |||
11 | BiCl3 | 0.35 | 179 | |||
12 | SbCl3 | 0.34 | 166 |
MgO활성도(S) | 통상글라스리스(BiCl3) | 베이스코팅 프리소둔분리제 | 조도(Ra: ㎛) | 광택도(index) | 자속밀도(B10) | 철손(W17/50) | 비고 | |
SbOCl | Sb2(SO4)3 | |||||||
50 | - | - | - | - | - | 1.91 | 0.87 | 통상재 |
5 | - | - | 0.31 | 191 | 1.91 | 0.90 | 비교재 | |
10 | - | - | 0.30 | 200 | 1.92 | 0.88 | ||
- | 5 | - | 0.29 | 215 | 1.92 | 0.88 | ||
- | 10 | - | 0.30 | 209 | 1.92 | 0.89 | ||
- | 20 | - | 0.28 | 220 | 1.92 | 0.87 | ||
- | 5 | 2.5 | 0.27 | 235 | 1.92 | 0.86 | ||
- | 10 | 2.5 | 0.26 | 280 | 1.92 | 0.85 | ||
- | 20 | 2.5 | 0.28 | 255 | 1.92 | 0.86 | ||
500 | - | 5 | - | 0.26 | 288 | 1.92 | 0.85 | 비교재 |
- | 10 | - | 0.25 | 301 | 1.92 | 0.83 | ||
- | 10 | 0.5 | 0.25 | 299 | 1.93 | 0.83 | ||
- | 10 | 3.5 | 0.24 | 316 | 1.93 | 0.81 | 본발명 | |
- | 7.5 | 0.23 | 330 | 1.93 | 0.79 | 본발명 | ||
- | 20 | 2.5 | 0.25 | 287 | 1.93 | 0.82 | 비교재 |
Claims (25)
- 융착방지제로 사용되는 전기강판용 소둔분리제에 있어서,MgO, 옥시클로라이드 물질 및 설페이트계 산화방지제를 포함하는 소둔분리제.
- 제1항에 있어서,상기 옥시클로라이드 물질은 안티모니 옥시클로라이드(SbOCl) 또는 비스무스 옥시클로라이드(BiOCl)인 소둔분리제.
- 제2항에 있어서,상기 설페이트계 산화방지제는 안티모니계 (Sb2(SO4)3), 스트론튬계 (SrSO4) 또는 바륨계 (BaSO4) 로부터 선택되는 하나 이상인 소둔분리제.
- 제 1 항 내지 제 3 항 중 어느 하나의 항에 있어서,상기 옥시클로라이드 물질은 중량비로, 상기 MgO: 100~200에 대하여 10~20의 비로 포함하고, 상기 설페이트계 산화방지제는 중량비로, 상기 MgO: 100~200 에 대하여 1~5의 비로 포함하는 소둔분리제.
- 강 슬라브를 열간 압연하여 열연 강판을 제조하는 단계;상기 열연 강판을 냉간 압연하여 냉연 강판을 제조하는 단계;상기 냉연 강판을 탈탄 소둔 및 질화 소둔 하는 단계;상기 탈탄 소둔 및 질화 소둔이 완료된 전기강판에 MgO, 옥시클로라이드 물질 및 설페이트계 산화방지제를 포함하는 소둔분리제 및 물을 포함하는 글라스리스 첨가제를 도포하여 최종 고온소둔 하는 단계;를 포함하는 방향성 전기강판의 제조방법.
- 제 5 항에 있어서,상기 옥시클로라이드 물질은 안티모니 옥시클로라이드(SbOCl) 또는 비스무스 옥시클로라이드(BiOCl)인 방향성 전기강판의 제조방법.
- 제 6 항에 있어서,상기 설페이트계 산화방지제는 안티모니계(Sb2(SO4)3), 스트론튬계(SrSO4) 또는 바륨계(BaSO4) 로부터 선택되는 하나 이상인 방향성 전기강판의 제조방법.
- 제7항에 있어서,상기 옥시클로라이드 물질은 중량비로, 상기 MgO: 100~200에 대하여 10~20의 비로 포함하고, 상기 설페이트계 산화방지제는 중량비로, 상기 MgO: 100~200 에 대하여 1~5의 비로 포함하는 방향성 전기강판의 제조방법.
- 제 8 항에 있어서,상기 탈탄 소둔 및 질화 소둔이 완료된 전기강판의 표면에 형성되는 SiO2의 양이 Fe2SiO4 양의 2~5배로 형성되는 방향성 전기강판의 제조방법.
- 제 9 항에 있어서,상기 탈탄 및 질화소둔 공정은 35~55℃의 노점(Dew Point) 범위에서 실시되는 방향성 전기강판의 제조방법
- 제10항에 있어서,상기 MgO의 활성화도는 400~3000초인 방향성 전기강판 제조방법.
- 제 11 항에 있어서,상기 최종 고온소둔시, 700~950℃의 온도 범위에서는 승온속도를 18~75℃/hr로 실시하고, 950~1200℃의 온도 범위에서는 10~15℃/hr로 실시하는 방향성 전기강판 제조방법.
- 제 12 항에 있어서,상기 탈탄 및 질화소둔시 온도는 800~950℃인 방향성 전기강판 제조방법.
- 제13항에 있어서,상기 글라스리스 첨가제는 5~8 g/m2 으로 도포하는 방향성 전기강판 제조방법.
- 제 14 항에 있어서,상기 강 슬라브는 중량 %로, Sn: 0.03~0.07%, Sb: 0.01~0.05%, P: 0.01~0.05%, 잔부는 Fe 및 기타 불가피하게 첨가되는 불순물을 포함하며, P+0.5Sb : 0.0370~0.0630% 를 만족하는 방향성 전기강판 제조방법.
- 중량 %로, Sn: 0.03~0.07%, Sb: 0.01~0.05%, P: 0.01~0.05%, 잔부는 Fe 및 기타 불가피하게 첨가되는 불순물을 포함하며, P+0.5Sb: 0.0370~0.0630% 을 만족하는 강 슬라브를 열간 압연하여 열연 강판을 제조 하고, 상기 열연 강판을 냉간 압연하여 냉연 강판을 제조 한 후, 상기 냉연 강판을 탈탄소둔 및 질화 소둔을 실시하되,상기 탈탄 소둔 및 질화 소둔이 완료된 강판의 표면에 형성되는 SiO2의 양은 Fe2SiO4 양의 2~5배인 방향성 전기강판.
- 제 16 항에 있어서,상기 탈탄 소둔 및 질화 소둔이 완료된 전기강판에 MgO, 옥시클로라이드 물질 및 설페이트계 산화방지제를 포함하는 소둔분리제 및 물을 포함하는 글라스리스 첨가제가 도포하여 최종 고온소둔을 실시한 방향성 전기강판.
- 제 17 항에 있어서,상기 옥시클로라이드 물질은 안티모니 옥시클로라이드(SbOCl) 또는 비스무스 옥시클로라이드(BiOCl)인 방향성 전기강판.
- 제 18 항에 있어서,상기 설페이트계 산화방지제는 안티모니계 (Sb2(SO4)3), 스트론튬계 (SrSO4) 또는 바륨계 (BaSO4) 로 부터 선택되는 하나 이상인 방향성 전기강판.
- 제19항에 있어서,상기 옥시클로라이드 물질은 중량비로, 상기 MgO: 100~200에 대하여 10~20의 비로 포함하고, 상기 설페이트계 산화방지제는 중량비로, 상기 MgO: 100~200 에 대하여 1~5의 비로 포함하는 방향성 전기강판.
- 제 20 항에 있어서,상기 탈탄 및 질화소둔 공정은 35~55℃의 노점(Dew Point) 범위에서 실시되는 방향성 전기강판.
- 제21항에 있어서,상기 MgO의 활성화도는 400~3000초인 방향성 전기강판.
- 제 22 항에 있어서,상기 최종 고온소둔시, 700~950℃의 온도 범위에서는 승온속도를 18~75℃/hr로 실시하고, 950~1200℃의 온도 범위에서는 10~15℃/hr로 실시하는 방향성 전기강판.
- 제 23 항에 있어서,상기 탈탄 및 질화소둔시 온도는 800~950℃인 방향성 전기강판.
- 제24항에 있어서,상기 글라스리스 첨가제는 5~8 g/m2 으로 도포하는 방향성 전기강판.
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JP2018504517A (ja) * | 2014-11-26 | 2018-02-15 | ポスコPosco | 方向性電磁鋼板用焼鈍分離剤組成物、およびこれを用いた方向性電磁鋼板の製造方法 |
US11066717B2 (en) * | 2015-12-21 | 2021-07-20 | Posco | Method for manufacturing grain-oriented electrical steel sheet |
US11725254B2 (en) * | 2015-12-24 | 2023-08-15 | Posco Co., Ltd | Method for manufacturing grain-oriented electrical steel sheet |
CN112030168A (zh) * | 2020-08-18 | 2020-12-04 | 武汉钢铁有限公司 | 改善渗氮取向硅钢表面亮点缺陷的工艺方法 |
CN112030168B (zh) * | 2020-08-18 | 2022-10-04 | 武汉钢铁有限公司 | 改善渗氮取向硅钢表面亮点缺陷的工艺方法 |
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JP6220891B2 (ja) | 2017-10-25 |
US10023932B2 (en) | 2018-07-17 |
JP2016513358A (ja) | 2016-05-12 |
KR101480498B1 (ko) | 2015-01-08 |
US20160194731A1 (en) | 2016-07-07 |
EP2940161B1 (en) | 2019-06-19 |
EP2940161A1 (en) | 2015-11-04 |
CN104884646B (zh) | 2018-02-02 |
CN104884646A (zh) | 2015-09-02 |
KR20140092467A (ko) | 2014-07-24 |
EP2940161A4 (en) | 2016-01-20 |
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