WO2023121266A1 - 이방향성 전기강판 및 그의 제조방법 - Google Patents
이방향성 전기강판 및 그의 제조방법 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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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- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
- C21D8/1222—Hot rolling
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- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
- C21D8/1233—Cold rolling
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
- C21D8/1261—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment following hot rolling
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- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
- C21D8/1266—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment between cold rolling steps
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- C—CHEMISTRY; METALLURGY
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the heat treatment
- C21D8/1272—Final recrystallisation annealing
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties of ferrous metals or ferrous alloys 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C2202/00—Physical properties
- C22C2202/02—Magnetic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- An embodiment of the present invention relates to a two-oriented electrical steel sheet and a manufacturing method thereof. Specifically, one embodiment of the present invention adjusts the rolling reduction rate in secondary cold rolling and the heating rate during cold-rolled sheet annealing to form fewer fine crystal grains, so that the magnetism in the rolling direction and the rolling vertical direction is very excellent, and the magnetic deviation It relates to a very small two-oriented electrical steel sheet and a manufacturing method thereof.
- Steel sheets made of iron have different characteristics depending on the direction due to the structural feature of BCC.
- Electrical steel used as the core material of a motor can maximize its properties by using the property that magnetization in the ⁇ 100> direction occurs most easily.
- grain-oriented electrical steel uses the secondary recrystallization phenomenon of the texture called Goss, so that the Rolling Direction (RD) of the product and the ⁇ 100> direction of all crystal grains are aligned in parallel with the atoms.
- One embodiment of the present invention is to provide a two-oriented electrical steel sheet and a manufacturing method thereof. Specifically, in one embodiment of the present invention, it is intended to provide a non-oriented electrical steel sheet and a manufacturing method thereof that achieve secondary recrystallization of cube and ⁇ 100 ⁇ fiber textures using surface energy.
- the two-oriented electrical steel sheet according to an embodiment of the present invention contains, by weight, Si: 2.0% or more, Al: 0.02% or less (excluding 0%), Mn: 0.02 to 0.50%, C: 0.004% or less (0% excluding), and S: 0.0005 to 0.005%, the balance including Fe and other impurities.
- the area fraction of crystal grains having a particle diameter of 2000 ⁇ m or less is 25% or less.
- the area fraction of crystal grains having an angle of 15° or less in the ⁇ 100> direction with the normal direction of the rolling surface of the steel sheet is 75% or more.
- the average particle diameter of the crystal grains may be 1000 to 5000 ⁇ m.
- the two-oriented electrical steel sheet according to an embodiment of the present invention may have a magnetic flux density (B50) of 1.82T or more and an iron loss (W15/50) of 1.65W/Kg or less.
- Si 2.0% or more, Al: 0.02% or less (excluding 0%), Mn: 0.02 to 0.50%, C: 0.004% or less in weight% (excluding 0%), and S: 0.0005 to 0.005%, the balance comprising Fe and other impurities, hot-rolling a slab to prepare a hot-rolled sheet; Preparing a primary cold-rolled sheet by first cold-rolling the hot-rolled sheet; Intermediate annealing of the primary cold-rolled sheet; It includes the step of producing a secondary cold-rolled sheet by secondary cold rolling of the intermediate annealed sheet and the step of annealing the secondary cold-rolled sheet.
- the reduction ratio is 55 to 85%.
- a step of raising the temperature at a heating rate of 100 °C/h or more in a temperature range of 100 to 1000 °C is further included.
- a step of annealing the hot-rolled sheet may be further included.
- the step of manufacturing the primary cold-rolled sheet may include one cold rolling or two or more cold rolling with intermediate annealing interposed therebetween.
- It can be rolled in the same direction in the step of manufacturing a primary cold-rolled sheet and the step of manufacturing a secondary cold-rolled sheet.
- the intermediate annealing step may be annealed at a temperature of 700° C. or higher.
- annealing may be performed in a reducing atmosphere.
- a step of applying an annealing separator may be further included.
- the step of annealing the secondary cold-rolled sheet may be annealed in a reducing atmosphere.
- Annealing the secondary cold-rolled sheet may be annealed at a temperature of 1000 to 1200 ° C for 6 to 60 hours.
- the two-oriented electrical steel sheet according to an embodiment of the present invention has similar magnetic values in a rolling direction and a direction perpendicular to the rolling direction regardless of direction, and exhibits excellent magnetic properties such as high magnetic flux density and low iron loss.
- 11 and 12 are pictures (left) of the rolling surfaces of the steel sheets prepared in Examples 1 and 2, Inverse Pole Figure (IPF) map pictures (middle), and Orientation Distribution Function (ODF) map pictures (right).
- IPF Inverse Pole Figure
- ODF Orientation Distribution Function
- first, second and third are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.
- % means weight%, and 1ppm is 0.0001 weight%.
- the meaning of further including an additional element means replacing and including iron (Fe) as much as the additional amount of the additional element.
- secondary recrystallization of cube and ⁇ 100 ⁇ fiber textures can be achieved using surface energy. It is a known fact that the ⁇ 110 ⁇ plane, which is a close packed plane, has the lowest energy in iron with a BCC structure. However, when some impurities are included, the ⁇ 100 ⁇ plane has the lowest energy. In one embodiment of the present invention, only cube and ⁇ 100 ⁇ fiber textures can be grown by maintaining a low energy state of ⁇ 100 ⁇ planes during long-term cold-rolled sheet annealing. Selective crystal growth using surface energy causes secondary recrystallization.
- the two-oriented electrical steel sheet according to an embodiment of the present invention contains, by weight, Si: 2.0% or more, Al: 0.02% or less (excluding 0%), Mn: 0.02 to 0.50%, C: 0.004% or less (0% excluding), and S: 0.0005 to 0.005%, the balance including Fe and other impurities.
- Si serves to increase the resistivity of the steel sheet and reduce eddy current loss, and allows heat treatment to occur in a single ferrite phase. If Si is too small, partial phase transformation of ferrite to austenite may occur during heat treatment. Therefore, the lower limit of the Si content may be limited to 2.0% by weight. In addition, since winding and cold rolling are difficult as Si is added, plate breakage may occur when Si exceeds 7.0% by weight, so this can be limited if necessary. That is, Si may be included in an amount of 2.0 to 7.0% by weight. More specifically, in order to obtain a steel sheet having a high magnetic flux density, Si may be included in an amount of 2.5 to 4.0% by weight.
- Aluminum (Al) may serve to increase specific resistance. However, when a steel sheet with a large amount of Al is added, Al 2 O 3 is formed on the surface of the steel sheet during heat treatment. Al 2 O 3 can penetrate grain boundaries from the surface, which inhibits the growth of crystal grains and becomes an element that hinders secondary recrystallization. Therefore, 0.02% by weight or less of Al is appropriate. More specifically, Al may be included in an amount of 0.01% by weight or less. More specifically, Al may be included in an amount of 0.005% by weight or less. More specifically, 0.001 to 0.005 wt% of Al may be included.
- Manganese (Mn) is an element that increases resistivity. However, if the addition of Mn is excessive, during heat treatment, the Austenite region may be exceeded and a phase transformation may occur. In addition, excessive Mn traps sulfur more than necessary and has the effect of preventing the diffusion of element S. An appropriate amount of Mn precipitates fine MnS, holding the grain boundary with weak force, and at an appropriate temperature, MnS melts away and causes secondary recrystallization. Since the speed of volatilized S can be controlled to some extent with Mn, it can be seen that the introduction of an appropriate amount of Mn plays a certain role in secondary recrystallization. More specifically, 0.05 to 0.30 wt% of Mn may be included.
- carbon (C) is an element that does not substitute for Fe atoms and invades the interstitial site. Due to its characteristics, when a large amount of C is entered, it inhibits the movement of dislocations and hinders the growth of crystal grains. More specifically, C may be included in an amount of 0.003% by weight or less. More specifically, 0.001 to 0.003% by weight of C may be included.
- the surface energy of sulfur (S) varies depending on the content of S segregated on the surface, and crystal growth of crystal grains of a specific orientation may occur due to the changed surface energy.
- the ⁇ 110 ⁇ plane is stable on a surface with no S at all
- the ⁇ 100 ⁇ plane is stable on a surface with weak S segregation
- the ⁇ 111 ⁇ plane is stable on a surface with a lot of S segregation.
- the S content is adjusted to a very small amount.
- Mn also serves to additionally hold S, helping weak segregation of S on the surface. More specifically, 0.0010 to 0.0040% by weight of S may be included.
- the balance other than the above components is Fe and unavoidable impurities.
- the inclusion of other elements is not excluded as long as they do not impair the effects of the present invention.
- additional elements may be included in place of Fe.
- the additional element may be, for example, one or more of N, Ti, P, Cu, Cr, Ni, and Mo, and when the additional element is added, it may be included in an amount of 0.1% by weight or less.
- the area fraction of crystal grains having a particle diameter of 2000 ⁇ m or less is 25% or less.
- the secondary cold-rolled sheet annealing is performed for a long time of 6 hours or more, but fine grains do not grow any more, and when these fine grains remain, they become a factor that inhibits magnetism.
- generation of fine grains is suppressed through rapid temperature increase before secondary cold-rolled sheet annealing, and through this, magnetism can be further improved. More specifically, the area fraction of crystal grains having a particle diameter of 2000 ⁇ m or less may be 10% or less.
- the area fraction of crystal grains having a particle diameter of 2000 ⁇ m or less may be 5% or less.
- the particle diameter of the crystal grain can be measured based on a plane parallel to the rolling plane (ND plane), and the diameter of a virtual circle having the same area as the crystal grain area is considered as the particle diameter.
- the area fraction of crystal grains and the grain diameter can be measured based on a plane parallel to the rolling plane (ND plane), and the area fraction can be measured from a specimen having an area of at least 60 ⁇ 60 mm 2 to reduce errors.
- the measured thickness since there is no substantial change in the grain size and area fraction in the thickness direction, the measured thickness may be measured at any thickness.
- the area fraction of crystal grains having an angle of 15° or less with the normal direction (ND direction) of the rolling surface of the steel sheet in the ⁇ 100> direction is 75% or more.
- the angle within 15° means an angle between the ⁇ 100> direction and the normal direction of the rolling surface based on an arbitrary surface including the ⁇ 100> direction and the normal direction of the rolling surface at the same time.
- An average particle diameter of crystal grains in the two-oriented electrical steel sheet according to an embodiment of the present invention may be 1000 to 5000 ⁇ m. If the average particle diameter of crystal grains is too small, the fraction of ⁇ 100>//ND texture is lowered, and magnetic properties may be inferior.
- the grain size can be measured based on a surface parallel to the rolling surface (ND surface) of the steel sheet. More specifically, the average grain size may be 2500 ⁇ m or more.
- the average particle diameter means a number average particle diameter.
- the two-oriented electrical steel sheet according to an embodiment of the present invention has excellent magnetic flux density and iron loss.
- the two-oriented electrical steel sheet according to an embodiment of the present invention may have a magnetic flux density (B50) of 1.82T or more and an iron loss (W15/50) of 1.65W/Kg or less. More specifically, the two-oriented electrical steel sheet according to an embodiment of the present invention may have a magnetic flux density (B50) of 1.90 T or more and an iron loss (W15/50) of 1.30 W/Kg or less.
- the magnetic flux density (B50) and iron loss (W15/50) are the magnetic flux density (B50) and iron loss (W15/50) measured in the rolling direction (RD direction) and the rolling vertical direction (TD direction). It means the average value and is a measured value based on the steel plate thickness of 0.2mm.
- a method for manufacturing a two-oriented electrical steel sheet includes the steps of hot rolling a slab to prepare a hot rolled sheet; Preparing a primary cold-rolled sheet by first cold-rolling the hot-rolled sheet; Intermediate annealing of the primary cold-rolled sheet; It includes the step of producing a secondary cold-rolled sheet by secondary cold rolling of the intermediate annealed sheet and the step of final annealing the secondary cold-rolled sheet.
- the slab is manufactured.
- the reason for limiting the addition ratio of each composition in the slab is the same as the reason for limiting the composition of the above-described two-oriented electrical steel sheet, so repeated descriptions are omitted. Since the element content is not substantially changed during manufacturing processes such as hot rolling, hot rolled sheet annealing, primary cold rolling, intermediate annealing, secondary cold rolling, and secondary cold rolled sheet annealing, which will be described later, the composition of the slab and the two-oriented electrical steel sheet composition is substantially the same.
- the slab can be manufactured using a thin slab method or a strip casting method.
- the thickness of the slabs can be 200 to 300 mm.
- the slab can be heated as needed.
- the heating temperature may be 1100 to 1250° C., and the heating time may be 30 minutes or more.
- a hot-rolled sheet is manufactured by hot-rolling the slab.
- the thickness of the hot-rolled sheet may be 2.0 to 3.0 mm.
- a step of annealing the hot-rolled sheet may be further included.
- the step of annealing the hot-rolled sheet may be annealed at a temperature of 1000 to 1150 °C. It may also be annealed for 60 to 150 seconds.
- a pickling step may be further included after the hot-rolled sheet annealing.
- a primary cold-rolled sheet is manufactured by primary rolling the hot-rolled sheet.
- the step of manufacturing the primary cold-rolled sheet may include one cold rolling or two or more cold rolling with intermediate annealing interposed therebetween.
- It can be rolled in the same direction in the step of manufacturing a primary cold-rolled sheet and the step of manufacturing a secondary cold-rolled sheet.
- the primary cold-rolled sheet is subjected to intermediate annealing.
- annealing may be performed at 700° C. or higher for 60 to 150 seconds.
- annealing may be performed in a reducing atmosphere. Since secondary cold rolling should be performed after intermediate annealing, annealing may be performed in an atmosphere containing a large amount of hydrogen to prevent oxidation during annealing. The remaining atmosphere may be air. More specifically, annealing may be performed in an atmosphere containing 99% by volume or more of hydrogen.
- a secondary cold-rolled sheet is manufactured by secondary cold rolling of the intermediate annealed sheet.
- Secondary cold rolling can adjust the reduction ratio to 55 to 85%.
- the reduction ratio is too small, a small number of crystal grains having ⁇ 100>//ND orientation may be formed.
- the reduction ratio is too high
- the ⁇ 100> direction of the crystal grains rotates after recrystallization, and secondary recrystallization occurs in directions more rotated than ⁇ 380>, such as ⁇ 250> or ⁇ 120>.
- the reduction ratio may be 55 to 80%. More specifically, the reduction ratio may be 55 to 65%.
- the reduction ratio may be calculated as ([steel sheet thickness before reduction] - [steel sheet thickness after reduction]) / [steel sheet thickness before reduction].
- an annealing separator may be applied for long-term annealing.
- the annealing separator may include alumina (Al 2 O 3 ).
- the secondary cold-rolled sheet is annealed.
- a step of raising the temperature at a heating rate of 100 °C/h or more in a temperature range of 100 to 1000 °C may be further included.
- the temperature increase rate means an average temperature increase rate in a corresponding temperature range.
- the heating rate is appropriately controlled, it is possible to minimize the number of fine crystal grains by growing a large number of fine crystal grains.
- the upper limit is not particularly limited, but may be 500°C/h. More specifically, the heating rate may be 100 to 300 °C/h.
- the step of annealing the secondary cold-rolled sheet may be annealed for 6 to 60 hours. If the annealing time is too short, crystal grains with ⁇ 100>//ND orientation may not be properly formed. If the annealing time is too long, energy waste may occur. More specifically, the final annealing step may be annealed for 12 to 48 hours.
- the step of annealing the secondary cold-rolled sheet may be annealed in a reducing atmosphere.
- Annealing may be performed in an atmosphere containing a large amount of hydrogen so as not to be oxidized during annealing.
- the remaining atmosphere may be air. More specifically, annealing may be performed in an atmosphere containing 99% by volume or more of hydrogen.
- Secondary cold-rolled sheet annealing step may be annealed at a temperature of 1000 to 1200 °C. If the annealing temperature is too low, recrystallization may not occur properly. Even if the annealing temperature is higher, it is difficult to improve the magnetism.
- the final thickness during the first cold rolling was 2mm (90%), 1mm (80%), 0.67mm (70%), and 0.50mm (60%), respectively, and the specimens after the first rolling were 2 minutes at 1050°C.
- Heat treatment was performed. At this time, the process was carried out in an atmosphere of 100% by volume of hydrogen.
- the specimen was subjected to secondary cold rolling and finally adjusted to a thickness of 0.2 mm.
- Each specimen was cut to a size of 60X60mm for measuring magnetism with a single sheet tester (SST), and the sized specimen was subjected to heat treatment at 1200 ° C for 24 hours. At this time, the temperature increase rate in the temperature range of 100 to 1000 ° C. was changed as shown in Table 1 below.
- a photograph of the crystal grain was obtained by scanning the grain area fraction, and the area fraction of the fine grain was calculated by calculating the area of the crystal grain from the photograph.
- the crystal grain orientation was measured on a 6 cm X 6 cm area by a method using Laue X-ray diffraction.
- 1 to 5 are photographs of rolled surfaces of steel sheets prepared in Comparative Examples 1 to 5, respectively. It can be seen that when the temperature increase rate is 10° C./h, a large amount of fine particles are not formed.
- 6 to 10 are photographs of rolled surfaces of steel sheets prepared in Comparative Examples 6 to 10, respectively. When the heating rate is 15 °C / h, the secondary recrystallization phenomenon begins to occur.
- 11 and 12 are photographs of rolled surfaces of steel sheets prepared in Example 1 and Example 2, respectively. At a heating rate of 300 ° C / h, more than 97% of secondary recrystallization occurs, and it can be seen that most of the fine particles do not exist.
- 1 to 12 are all photographs of a size of 6 cm ⁇ 6 cm, and yellow lines indicate grain boundaries between secondary recrystallization and fine grains.
- FIGS. 15 and 16 are Orientation Distribution of the steel sheets prepared in Examples 1 and 2 This is a picture of a Function (ODF) map.
- the ODF maps in FIGS. 11 and 12 show that psi2 is 45 degrees, and it can be seen that the grids in the ODF are spaced at 10 degree intervals, and only the direction is changed while maintaining the ⁇ 100 ⁇ plane. In addition, it can be seen that the contour line of the texture strength on the ODF is within 15 degrees of the ⁇ 100> // ND plane.
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Abstract
Description
| 2차 냉간압하율 (%) |
승온속도 (℃/h) |
2000㎛이하 결정립 면적 분율 (%) | <100>//ND 면적 분율 (%) |
B50(T) | W15/50(W/kg) | |
| 비교예 1 | 50 | 10 | 100 | 5 | 1.69 | 1.72 |
| 비교예 2 | 60 | 10 | 100 | 5 | 1.72 | 1.59 |
| 비교예 3 | 70 | 10 | 100 | 5 | 1.74 | 1.63 |
| 비교예 4 | 80 | 10 | 100 | 5 | 1.72 | 1.66 |
| 비교예 5 | 90 | 10 | 100 | 5 | 1.59 | 2.03 |
| 비교예 6 | 50 | 15 | 68 | 40 | 1.65 | 1.87 |
| 비교예 7 | 60 | 15 | 67 | 40 | 1.78 | 1.47 |
| 비교예 8 | 70 | 15 | 84 | 35 | 1.76 | 1.51 |
| 비교예 9 | 80 | 15 | 91 | 15 | 1.69 | 1.79 |
| 비교예 10 | 90 | 15 | 94 | 10 | 1.62 | 2.04 |
| 실시예 1 | 70 | 300 | 3 | 97 | 1.99 | 1.30 |
| 실시예 2 | 80 | 300 | 3 | 97 | 1.92 | 1.32 |
Claims (12)
- 중량%로 Si: 2.0% 이상, Al: 0.02% 이하(0%를 제외함), Mn: 0.02 내지 0.50%, C: 0.004% 이하(0%를 제외함), 및 S: 0.0005 내지 0.005% 포함하고, 잔부 Fe 및 기타 불순물을 포함하고, 입경이 2000㎛ 이하인 결정립의 면적 분율이 25% 이하 인 이방향성 전기강판.
- 제1항에 있어서,<100> 방향이 강판의 압연면 법선방향과 15° 이내의 각도를 갖는 결정립의 면적 분율이 75 % 이상인 이방향성 전기강판.
- 제1항에 있어서,결정립의 평균 입경은 1000 내지 5000㎛ 인 이방향성 전기강판.
- 제1항에 있어서,자속밀도(B50)가 1.82T 이상이고, 철손(W15/50)이 1.65W/Kg 이하인 이방향성 전기강판.
- 중량%로 Si: 2.0% 이상, Al: 0.02% 이하(0%를 제외함), Mn: 0.02 내지 0.50%, C: 0.004% 이하(0%를 제외함), 및 S: 0.0005 내지 0.005% 포함하고, 잔부 Fe 및 기타 불순물을 포함하는 슬라브를 열간압연하여 열연판을 제조하는 단계; 열연판을 1차 냉간압연하여 1차 냉연판을 제조하는 단계; 1차 냉연판을 중간 소둔하는 단계; 중간 소둔판을 2차 냉간압연하여 2차 냉연판을 제조하는 단계 및 2차 냉연판을 소둔하는 단계를 포함하고,상기 2차 냉연판을 제조하는 단계에서 압하율이 55 내지 85%이고,2차 냉연판을 소둔하는 단계 이전에 100 내지 1000℃온도 범위에서 100℃/h 이상의 승온 속도로 승온하는 단계를 더 포함하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 열연판을 제조하는 단계 이후, 열연판을 열연판 소둔하는 단계를 더 포함하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 1차 냉연판을 제조하는 단계는 1회의 냉간압연 또는 중간소둔을 사이에 둔 2회 이상의 냉간압연을 포함하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 1차 냉연판을 제조하는 단계 및 2차 냉연판을 제조하는 단계에서 동일 방향으로 압연하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 중간 소둔하는 단계는 환원 분위기에서 소둔하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 2차 냉연판을 제조하는 단계 이후 소둔 분리제를 도포하는 단계를 더 포함하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 2차 냉연판을 소둔하는 단계는 환원 분위기에서 소둔하는 이방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 2차 냉연판을 소둔하는 단계는 1000 내지 1200℃의 온도에서 6 내지 60 시간 동안 소둔하는 이방향성 전기강판의 제조 방법.
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| US18/721,100 US20250059616A1 (en) | 2021-12-21 | 2022-12-20 | Double oriented electrical steel sheet and method for manufacturing same |
| CN202280088502.7A CN118475713A (zh) | 2021-12-21 | 2022-12-20 | 双取向电工钢板及其制造方法 |
| JP2024537506A JP2025500053A (ja) | 2021-12-21 | 2022-12-20 | 二方向性電磁鋼板およびその製造方法 |
| EP22911899.7A EP4455330A4 (en) | 2021-12-21 | 2022-12-20 | DOUBLE-ORIENTED ELECTRICAL STEEL SHEET AND MANUFACTURING METHOD THEREOF |
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| WO2026084308A1 (ko) * | 2024-10-14 | 2026-04-23 | 현대제철 주식회사 | 무방향성 전기강판 및 무방향성 전기강판의 제조방법 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318051A2 (en) * | 1987-11-27 | 1989-05-31 | Nippon Steel Corporation | Process for production of double-oriented electrical steel sheet having high flux density |
| KR100460046B1 (ko) * | 2000-12-20 | 2004-12-04 | 주식회사 포스코 | 방향성 전기강판의 제조방법 |
| KR100837129B1 (ko) * | 2001-01-19 | 2008-06-11 | 제이에프이 스틸 가부시키가이샤 | 포스테라이트를 주체로 하는 하지피막을 갖지 않는,자기특성이 양호한 방향성 전자강판과 그 제조방법 |
| KR20170074635A (ko) * | 2015-12-22 | 2017-06-30 | 주식회사 포스코 | 방향성 전기강판의 제조 방법 |
| KR20210079754A (ko) * | 2019-12-20 | 2021-06-30 | 주식회사 포스코 | 이방향성 전기강판 및 그의 제조방법 |
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| JP4123629B2 (ja) * | 1999-04-23 | 2008-07-23 | Jfeスチール株式会社 | 電磁鋼板およびその製造方法 |
| JP4123653B2 (ja) * | 1999-10-12 | 2008-07-23 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
| JP4811390B2 (ja) * | 2007-11-19 | 2011-11-09 | Jfeスチール株式会社 | 二方向性電磁鋼板 |
| KR102105529B1 (ko) * | 2018-09-27 | 2020-04-28 | 주식회사 포스코 | 이방향성 전기강판 및 그의 제조방법 |
| KR102271299B1 (ko) * | 2019-12-19 | 2021-06-29 | 주식회사 포스코 | 이방향성 전기강판 및 그의 제조방법 |
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- 2022-12-20 WO PCT/KR2022/020901 patent/WO2023121266A1/ko not_active Ceased
- 2022-12-20 EP EP22911899.7A patent/EP4455330A4/en active Pending
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0318051A2 (en) * | 1987-11-27 | 1989-05-31 | Nippon Steel Corporation | Process for production of double-oriented electrical steel sheet having high flux density |
| KR100460046B1 (ko) * | 2000-12-20 | 2004-12-04 | 주식회사 포스코 | 방향성 전기강판의 제조방법 |
| KR100837129B1 (ko) * | 2001-01-19 | 2008-06-11 | 제이에프이 스틸 가부시키가이샤 | 포스테라이트를 주체로 하는 하지피막을 갖지 않는,자기특성이 양호한 방향성 전자강판과 그 제조방법 |
| KR20170074635A (ko) * | 2015-12-22 | 2017-06-30 | 주식회사 포스코 | 방향성 전기강판의 제조 방법 |
| KR20210079754A (ko) * | 2019-12-20 | 2021-06-30 | 주식회사 포스코 | 이방향성 전기강판 및 그의 제조방법 |
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| Title |
|---|
| See also references of EP4455330A4 * |
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| US20250059616A1 (en) | 2025-02-20 |
| KR20230094866A (ko) | 2023-06-28 |
| CN118475713A (zh) | 2024-08-09 |
| EP4455330A4 (en) | 2025-04-09 |
| EP4455330A1 (en) | 2024-10-30 |
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