165 results about "Electrical steel" patented technology

The present invention can provide a non-oriented electrical steel sheet having improved surface properties and magnetic properties, and another aspect provides a method for manufacturing the non-oriented electrical steel sheet.

This grain-oriented electrical steel sheet is provided with a base steel sheet and an insulating coating film, wherein the insulating coating film contains, in terms of mass%, 10%-20% of P, 18%-25% of Si, 1.1%-2.7% of V, and 2%-5% of Al as a chemical composition, and Cr is limited to less than 0.1%.

This invention discloses a method for manufacturing 50W470 high-magnetic-induction, low-iron-loss non-oriented electrical steel without normalization, comprising: hot iron pretreatment; centralized stacking of cast billets; hot rolling on a 2250mm production line; rolling the hot-rolled coil to 0.50mm using a 5-stand acid continuous rolling mill with a total reduction rate of 78%; and rapid heating in the continuous annealing furnace heating section. Its chemical composition by mass percentage is: C: ≤0.0025%, Si: 1.65~1.85%, Mn: 0.20~0.40%, P: ≤0.030%, S: ≤0.004%, Als: 0.50~0.70%, N: ≤0.0020%, O ≤0.0020%, Ti: ≤0.0025%, Nb ≤0.0030%. The purpose of this invention is to achieve full-process production and control of low iron loss and high magnetic induction performance, ensuring that the magnetic properties meet market and user requirements.

Data on decarburization annealed sheet quality index and final annealing conditions of a product sheet are acquired, and data on oxygen coating weight and (Ti + V + Zr + Nb) coating weight contained in a forsterite film of the product sheet are also acquired. Using actual values of each coating weight as objective variables, and using actual values of decarburization annealed sheet quality index, annealing separator composition, and final annealing conditions as explanatory variables, a prediction model for each coating weight is created through multiple regression analysis or machine learning. The steel sheet is divided into i segments in the longitudinal direction and into j segments in the transverse direction and positions (m, n) are defined, and using the prediction model for each coating weight and based on values of decarburization annealed sheet quality index at each position (m, n), annealing separator composition and final annealing conditions are set so that both an oxygen coating weight and a (Ti + V + Zr + Nb) coating weight / oxygen coating weight ratio at each position (m, n) fall within a range defined by film adhesion.

According to an embodiment of the present invention, the non-oriented electrical steel sheet comprises, by weight %, 1.5 to 5.0% Si, 0.1 to 2.0% Al, 0.1 to 2.0% Mn, 0.001 to 0.08% Sn, 0.001 to 0.08% Sb and 0.0002 to 0.0007% B, with the balance being Fe and unavoidable impurities. When the elemental content is measured along the thickness direction of the steel sheet in a surface portion ranging from the surface to the interior in a range of 0.3 to 1 μm, the weight ratio of the maximum Si content to the maximum Al content is 25 or less.

An insulating coating composition for an electrical steel sheet, according to an embodiment of the present invention, comprises: 100 parts by weight of a metal phosphate; 30 to 170 parts by weight of silica; 20 to 100 parts by weight of nitrate; 20 to 170 parts by weight of zirconium oxide; and 60 to 550 parts by weight of at least one shielding agent among dolomite, talc, carbonate and feldspar.

A laminated core includes a stack of pieces of an electrical steel sheet that have a predetermined shape resulting from processing and includes a butted portion at which portions of a processed surface of the electrical steel sheet are abutted against each other. In the electrical steel sheet, an area ratio of regions of the processed surface that have an arithmetic mean roughness Ra of 5 μm or less is 90% or greater based on a total area of the processed surface.

An annealing facility for continuously performing finish annealing by sequentially passing a steel sheet after cold rolling through an annealing furnace having at least a first zone, a second zone, and a third zone, wherein each zone of the annealing furnace can independently control the gas composition and dew point of the atmosphere, and the second zone is composed of a heating zone, a cracking zone, and a cooling zone in which the atmosphere temperature is 900°C or higher, and the nitrogen content of the atmosphere gas is controlled to be 30 vol% or less and the dew point to be -40°C or lower. In addition, by performing finish annealing using the annealing facility, an electrical steel sheet, preferably a non-oriented electrical steel sheet with low iron loss, is manufactured.

This application belongs to the field of electrical steel manufacturing technology, specifically relating to an ultra-thin non-oriented silicon steel and its preparation method. The preparation method includes: obtaining a silicon steel slab, and performing five cold rolling passes on the silicon steel slab to obtain ultra-thin non-oriented silicon steel. During the five cold rolling passes, there are no external heating sources or heat preservation equipment. The silicon content of the silicon steel slab is 4.0-4.5 wt%. The five cold rolling passes are sequentially divided into a first pass, a second pass, a third pass, a fourth pass, and a fifth pass. The initial rolling temperature of the first pass is room temperature, and the final rolling temperature of the first pass is 60-65℃. This application achieves a self-heating temperature by coordinating and matching the pass reduction rate, rolling speed, and tension, thereby achieving the target thickness and ensuring the plate shape.

The application discloses a kind of based on crystal plastic finite element and sequence condition generation formula deep learning agent model's oriented electrical steel cold rolling texture fast prediction method, system and medium, with cold rolling process parameter set as input, with ODF slice image as output;Through the crystal plastic finite element model driven by physical mechanism, "process path-ODF" virtual labeling data pair is generated in batch in pre-set cold rolling process design space, and data set is constructed;Then using sequence condition generation formula deep learning agent model realizes the end-to-end nonlinear mapping from cold rolling process path to high-dimensional ODF image, so that the premise of not needing to call crystal plastic finite element model successively, realize the fast prediction, visualization and path regulation of cold rolling texture evolution.This application solves the problem of existing fusion crystal plastic simulation precision advantage and deep learning model high efficient generalization ability, realizes the fast and accurate prediction of cold rolling texture evolution.

Provided is a method of producing an electrical steel sheet with an insulating coating that excels in both punchability and weldability under more severe evaluation conditions. The method of producing an electrical steel sheet with an insulating coating includes a process of preparing a water-based coating material and a process of applying the water-based coating material to the surface of an electrical steel sheet and heating and drying to form an insulating coating. The water-based coating material contains resin, an inorganic component, an optional organic reductant, an optional B compound, and water. 50 mass % or more of the resin consists of one or both of emulsion resin and dispersion resin. The water-based coating material has a viscosity of 1.0 mPa·s or more.

A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by wt%: 4.0 to 7.0% of Si; 0.001 to 2.0% of Al; 0.03 to 2.0% of Mn; and the remainder of Fe and inevitable impurities, wherein the RPc value of the surface of the steel sheet is 30 to 100, and the sum of oxygen (O) and carbon (O) components in a surface region of 1 mm2 is 1 wt% or less, as measured by EDS compositional analysis using scanning electron microscopy.

A method for manufacturing a grain-oriented electrical steel sheet includes a hot rolling step, a hot-band annealing step, a cold rolling step, a decarburization annealing step, a separator applying step, a finish annealing step, a surface treatment step, a thermal oxidation-reduction annealing step, and a tension-applying insulating coating forming step, in which the thermal oxidation-reduction annealing step includes a primary temperature rising process of heating a surface-treated steel sheet to raise the temperature of the surface-treated steel sheet, a primary annealing process of holding a steel sheet temperature at a constant temperature in a range of 800°C to 900°C for a constant holding time in a range of 10 seconds to 200 seconds in an atmosphere having a constant value in a range of an oxygen potential PH2O / PH2 of 0.10 to 10.00, and a secondary annealing process of holding the steel sheet temperature at a constant temperature in a range of 900°C to 1100°C for a constant holding time in a range of 3 seconds to 100 seconds in an atmosphere having a constant value in a range of an oxygen potential PH2O / PH2 of less than 0.1000 and a dew point of less than -20°C.

The insulating coating of the grain-oriented magnetic steel sheet contains no chromium compound but contains a phosphate, and the content of the phosphate is 0.5% or more and less than 2.0% as measured by the nuclear magnetic resonance method 31 The P-NMR spectrum was subjected to Gaussian fitting in the range of 16 to -90 ppm, and the proportion of the peak area of the structure to the total peak area was more than 0% and 10% or less. 0 The P-NMR spectrum was subjected to Gaussian fitting in the range of 16 to -90 ppm, and the proportion of the peak area of the structure to the total peak area was more than 0% and 10% or less.

A method for manufacturing an oriented electromagnetic steel sheet of the present invention is a method for manufacturing an oriented electromagnetic steel sheet by heating a steel billet having a composition containing, in mass%, C: 0.02 to 0.10%, Si: 2.5 to 5.5%, Mn: 0.01 to 0.30%, sol. Al: 0% or more but less than 0.010%, N: 0% or more but less than 0.006%, and at least one of S and Se: 0% or more but less than 0.010%, the remainder being Fe and inevitable impurities, to a temperature of 1300°C or lower, performing hot rolling, performing cold rolling once or twice or more with intermediate annealing to produce a cold-rolled sheet having a final sheet thickness, performing primary recrystallization annealing serving as decarburization annealing, applying an annealing separator, and performing final annealing, wherein, in an annealing step before the cold rolling to produce the cold-rolled sheet having the final sheet thickness, after soaking, cooling is performed at an average cooling rate of 15°C / s or more from 800°C to 400°C, and then low-temperature heat treatment is performed at a temperature of 60 to 100°C for a temperature retention time of 30 to 600 seconds.

A non-oriented electrical steel sheet according to an embodiment of the present invention contains, by wt%, 1.5 to 5.0% Si, 0.1 to 2.0% Al and 0.1 to 2.0% Mn, with the balance being Fe and inevitable impurities. In a cross section that includes the rolling direction and the thickness direction of the steel sheet, in the central portion going from 1 / 4 to 3 / 4 of the total thickness of the steel sheet, the angle between {113}<110> and the shear band in the rolling direction of the steel sheet is 25 to 55°.

In the production of a non-oriented electrical steel sheet by hot rolling a steel plate containing Si: 2.8 to 6.5% by mass and Zn: 0.0005 to 0.0050% by mass, followed by cold rolling and finish annealing, a coating agent containing at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb and Bi is applied to the surface of the steel sheet after the finish annealing, to form an insulating coating with nitriding suppression capability.Alternatively, an intermediate layer containing at least one element selected from Sn, Sb, P, S, Se, As, Te, B, Pb, and Bi and having nitriding suppression capability is formed on the iron matrix of the steel sheet after finish annealing, and an insulating coating not containing the above elements is formed on the intermediate layer to thus obtain an electrically non-oriented steel sheet from which a rotor core with high strength and a stator core with excellent magnetic properties can be obtained simultaneously after stress-relief annealing, and a motor core comprising a stator core and a rotor core is produced from the steel sheet.

According to one embodiment of the present invention, the iron core comprises a laminate of multiple sheets of non-oriented electrical steel plates, wherein, by weight percent, the non-oriented electrical steel plates comprise Si: 1.5 to 4.5%, Al: 0.1 to 2.0%, Mn: 0.1 to 2.0%, with the balance comprising Fe and unavoidable impurities. The non-oriented electrical steel plates have a composition from {100} <025> The area fraction of grains with an orientation of less than 15° is 7% or more.

A non-oriented electrical steel sheet according to an embodiment of the present invention comprises, in weight %, 1.5-5.0% Si, 0.1-3.0% Al, 0.1-3.0% Mn, and 0.0010-0.0100 % La, the remainder being Fe and inevitable impurities.

The grain-oriented electrical steel sheet includes a base steel sheet having a predetermined chemical composition, a glass coating provided on a surface of the base steel sheet, and a tension-applying insulation coating provided on a surface of the glass coating. The base steel sheet has a texture oriented in the Goss orientation. In the base steel sheet, when an average dispersion angle from an ideal Goss orientation with a rolled surface normal direction ND as the rotation axis is defined as α (°), an average dispersion angle from the ideal Goss orientation with an orthogonal-to-rolling direction TD as the rotation axis is defined as β(°), and an average dispersion angle from the ideal Goss orientation with a rolling direction RD as the rotation axis is defined as γ (°), α, β, and γ satisfy the following formula (1). 0.0≤|β|<2.5<|α|<4.0≤|γ|≤10.0 . . . (1)

This grain-oriented electrical steel sheet includes a steel sheet having a surface in which a plurality of grooves extending in a direction intersecting a rolling direction and having a depth in a sheet thickness direction are formed. In a cross section parallel to the rolling direction and parallel to the sheet thickness direction, when a distance from an inlet portion of a groove to an opposite inlet portion of the groove is defined as a width of the groove, a region equivalent to the width of the groove from the inlet portion of the groove of the steel sheet in a direction opposite to a center of the groove in the rolling direction is defined as a groove edge portion, and a surface in a region separated from the inlet portion of the groove in the direction opposite to the center of the groove in the rolling direction is defined as a reference plane, the groove edge portion has a projection that is a region having a width of 1 μm or more and a projection height of 1 μm or more from the reference plane, and an area fraction of Goss oriented grains of the projection is 10% or more.

A non-oriented electrical steel sheet according to one embodiment of the present invention comprises, by wt%, 4-7% of Si, 0.001-3% of Al, 0.003-3% of Mn, and the balance of Fe and inevitable impurities. ΔSi, which is defined as the difference ([S-MSi]-[C-MSi]) between the Si amount [C-MSi] at the plate thickness center (t / 2) and the maximum Si amount [S-MSi] in the region from the surface of the non-oriented electrical steel sheet inward to 5% of the total thickness, is 0.1 wt% or more, and the area fraction of grains having an orientation distribution within grains of 5° or less is 95% or more.

An electrical steel plate adhesive coating composition according to an embodiment includes a mixed resin of an urethane resin and an epoxy resin, wherein the urethane resin includes a repeating unit represented by Chemical Formula 1 and Chemical Formula 2.

A non-oriented electrical steel sheet according to an embodiment of the present invention comprises, in weight percent, 1.5-5.0% Si, 0.1-3.0% Al, and 0.1-3.0% Mn, with the balance being Fe and inevitable impurities, and, in a cross-section taken in the thickness direction of the steel sheet, the surface portion extending from the surface to one-quarter of the total thickness has a grain-size standard deviation of 45-55 µm, and the central portion extending from beyond one-quarter to one-half of the thickness has a grain-size standard deviation of 50-70 µm.

A grain-oriented electrical steel sheet according to an embodiment of the present disclosure includes a grain having an orientation of {110}<001>. A size of the grain satisfies Equation 1 below and an area fraction of the grain in which an angle deviated from the orientation of {110}<001> is within 3° is 60% or more.W / L≤1.5.〈Equation⁢ 1〉In Equation 1 above, W means a diameter in a transverse direction that is a width direction of a secondary recrystallization grain and L means a diameter in a rolling direction that is a length direction of the secondary recrystallization grain.

A non-oriented electrical steel sheet according to an embodiment of the present invention contains, by wt%, 1.5 to 5.0% Si, 0.1 to 2.0% Al, 0.1 to 2.0% Mn, 0.005 to 0.1% Cu, 0.0003 to 0.007% S and 0.0005 to 0.01% Mg, with the balance being Fe and inevitable impurities, wherein the average particle diameter of sulfides in a surface portion going from the surface of the steel sheet to 1 / 4 of the thickness of the steel sheet is 0.8 to 2.0 µm, and the average particle diameter of sulfides in a central portion going from more than 1 / 4 of the thickness of the steel sheet from the surface thereof to 1 / 2 of the thickness of the steel sheet from the surface thereof is 2.0 to 5.0 µm.

This method for producing a grain-oriented electrical steel sheet comprises a hot rolling step, a hot rolled sheet annealing step, a cold rolling step, a decarburization annealing step, a separation agent coating step, a finish annealing step, a surface treatment step, a thermal oxidation-reduction annealing step and a tension-imparting insulating film forming step. The thermal oxidation-reduction annealing step comprises: a primary heating process in which the temperature of a surface-treated steel sheet is raised by heating; a primary annealing process in which the temperature of the steel sheet is maintained at a certain temperature within the range of 800°C to 900°C for a certain retention time within the range of 10 to 200 seconds in an atmosphere in which the oxygen potential PH2O / PH2 is at a certain value within the range of 0.10 to 10.00; and a secondary annealing process in which the temperature of the steel sheet is maintained at a certain temperature within the range of 900°C to 1100°C for a certain retention time within the range of 3 to 100 seconds in an atmosphere in which the oxygen potential PH2O / PH2 is less than 0.1000 and the dew point is at a certain value less than -20°C.

In this grain-oriented electromagnetic steel sheet, in a cross-section orthogonal to the extending direction of an irradiation mark of an energy ray and parallel to the sheet thickness direction, when a virtual line is drawn in the sheet thickness direction so as to include a position where compressive elastic stress measured by EBSD is 20 MPa or more, the degree of change in the compressive elastic stress on the virtual line is 4 MPa or less per 1 μm over the entire region in the sheet thickness direction.

The present invention belongs to the technical field of electrical steel, and in particular relates to a normalized non-oriented silicon steel plate having low susceptibility to aging embrittlement, and a production method therefor. The chemical components in the steel are, in percentages by weight: C≤0.005%, Si: 2.5%-3.6%, Mn: 0.2%-0.8%, Al: 0.5%-1.2%, N≤0.003%, Sn: 0.04%-0.06%, Sb: 0.0075%-0.1%, and the balance of Fe and inevitable impurities. In comparison with the prior art, the present invention has the beneficial effects of: compared with a traditional normalized non-oriented silicon steel plate, a normalized coil prepared in the present invention can still maintain a high cold deformability after long-term storage, thereby inhibiting the occurrence of edge cracks and strip breakage during cold rolling of silicon steel.

A motor core assembly is disclosed. A motor core assembly according to an exemplary embodiment of the disclosed present invention is a stack of a plurality of core sheets cut from electrical steel sheets including two or more overlapping layers, wherein at least one first layer of the core sheets includes a first burr portion extending downward from a first front end portion of the edge end, at least one second layer overlapping the first layer includes a second burr portion extending downward from a second front end portion of the edge end, and the lengths of the first burr portion and the second burr portion may be different from each other.