72results about How to "Low iron-loss" patented technology

A method for producing a soft magnetic metal powder coated with a Mg-containing oxide film, comprising the steps of adding and mixing a Mg powder with a soft magnetic metal powder which has been subjected to heating treatment in an oxidizing atmosphere at a temperature of 40 to 500° C. to obtain a mixed powder, and heating the mixed powder at a temperature of 150 to 1,100° C. in an inert gas or vacuum atmosphere under a pressure of 1×10⁻¹² to 1×10⁻¹ MPa, while optionally tumbling; and a method for producing a composite soft magnetic material from the soft magnetic metal powder coated with a Mg-containing oxide film.

During manufacturing of a grain-oriented electromagnetic steel sheet by subjecting a Si-containing steel slab to hot rolling, cold rolling, primary recrystallization annealing, and finish annealing and forming a tension-imparting coating thereon, a grain-oriented electromagnetic steel sheet having good core loss characteristics is obtained by retention for 1 to 10 seconds at a temperature T from 250 to 600DEG C in the heating process of the primary recrystallization annealing, heating at a rate of 80 DEG C/s in the range of the temperature T to 700 DEG C and 15 DEG C/s in the range of 700 DEG C to a soaking temperature, setting the oxygen potential in the range of 700 DEG C to the soaking temperature to 0.2 to 0.4 and the oxygen potential during soaking to 0.3 to 0.5, and configuring secondary recrystallized grains so that the area ratio for which the deviation angle alpha from the (110)<001> ideal orientation is less than 6.5degrees is at least 90%, the area ratio for which the deviation angle beta is less than 2.5degrees is at least 75%, the average length (L) in a rolling direction is 20 mm or less, and the average value (beta) (degrees) of the deviation angle beta satisfies the expression 15.63* (beta) + [L] <44.06.

The present invention provides a non-oriented silicon steel with excellent magnetic properties and a manufacturing process therefor. During the manufacturing process of the present invention, the temperature T of the molten steel of steel tapped from a converter during steelmaking and the carbon content [C] and the free oxygen content [O] comply with the following formula: 7.27×10³≦[O][C]e^(−5000/T)≦2.99×10⁴, and the final annealing step uses tension annealing at a low temperature for a short time. A non-oriented silicon steel with a low iron loss, and excellent anisotropy of iron loss can be obtained by means of the manufacturing process of the present invention.

According to the present invention, a high-strength electrical steel sheet that is suitable as rotor material for a high speed motor, steadily has high strength, and also has excellent magnetic properties can be obtained by setting the chemical composition thereof to include, by mass %, C: 0.005% or less, Si: more than 3.5% and 4.5% or less, Mn: 0.01% or more and 0.10% or less, Al: 0.005% or less, Ca: 0.0010% or more and 0.0050% or less, S: 0.0030% or less, and N: 0.0030% or less, Ca/S being 0.80 or more, the balance being Fe and incidental impurities, and by setting the sheet thickness to 0.40 mm or less, the non-recrystallized deformed microstructure to 10% or more and 70% or less, tensile strength (TS) to 600 MPa or more, and iron loss W_10/400 to 30 W/kg or less.

The invention discloses a dephosphorization method for oxygen top-blown converter slag remainder. The dephosphorization method includes the steps that before slag-splashing for protection of a converter, a dephosphorization agent is added to the slag remainder in the converter after tapping, then inert gases are top-blown by an oxygen gun for the operation of slag-splashing for protection of the converter, and dephoshprized slag remainder serve as initial slag of the next melt of smelting. According to the method, the oxygen top-blown converter slag remainder operation is combined with the slag remainder dephosphorization process, the phosphorus content in the slag remainder can be lowered effectively, and the drag-in amount of phosphorus in the next melt of converter smelting process is lowered, so that the lime addition amount in the next melt of converter smelting process can be reduced, and the converter smelting cost is lowered. By the adoption of the dephosphorization method, part of the phosphorus element in the slag remainder in the converter can be removed, the slag amount is small in the smelting process, the heat loss is low, the iron loss is small, the converter slag dephosphorization effect is good, and the smelting cost is lowered remarkably.

A method for manufacturing bodies formed from insulated soft magnetic metal powder by forming an insulating film of an inorganic substance on the surface of particles of a soft magnetic metal powder, compacting and molding the powder, then carrying out a heat treatment to provide a body formed from insulated soft magnetic metal powder the method comprising: compacting and molding the powder; then magnetically annealing the powder at a high temperature above the Curie temperature for the soft magnetic metal powder and below the threshold temperature at which the insulating film is destroyed in a non-oxidizing atmosphere, such as a vacuum, inert gas, or the like; and then carrying out a further heat treatment at a temperature of from 400° C. to 700° C. in an oxidizing atmosphere, such as air, or the like.

In a method for producing a grain-oriented electrical steel sheet by comprising a series of steps of hot rolling a raw steel material comprising C: 0.002-0.10 mass %, Si: 2.0-8.0 mass %, and Mn: 0.005-1.0 mass %, subjecting the steel sheet to a hot band annealing as required, cold rolling to obtain a cold rolled sheet having a final sheet thickness, subjecting the steel sheet to primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to final annealing, rapid heating is performed at a rate of not less than 50° C./s in a region of 200-700° C. in the heating process of the primary recrystallization annealing, and the steel sheet is held at any temperature of 250-600° C. in the above region for 1-10 seconds, while a soaking process of the primary recrystallization annealing is controlled to a temperature range of 750-900° C., a time of 90-180 seconds and P_H2O/P_H2 in an atmosphere of 0.25-0.40, whereby a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value is obtained.

A method for producing a grain-oriented electrical steel sheet includes hot rolling a raw steel material containing C: 0.002˜0.10 mass %, Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet, subjecting the sheet after or without hot band annealing to one or two or more stage cold rollings including an intermediate annealing to obtain a cold rolled sheet having a final sheet thickness, subjecting the rolled sheet to decarburization annealing and primary recrystallization annealing, applying an annealing separator to the sheet surface and subjecting to a final annealing, when rapid heating is performed at a rate of at least 50° C./s in a range of 200˜700° C. of the decarburization annealing, the rolled sheet is subjected to holding at any temperature of 250˜600° C. for 1˜10 seconds to produce a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value.

A non-oriented electrical steel sheet having a high magnetic flux density and a low iron loss includes C: not more than 0.01 mass %, Si: 1.3-5.0 mass %, Mn: 0.001-3 mass %, sol. Al: not more than 0.004 mass %, P: 0.03-0.20 mass %, S: not more than 0.005 mass %, N: not more than 0.005 mass %, Ti: more than 0.0020 mass % but not more than 0.1 mass %, and further contains one or more selected from Sn: 0.001-0.1 mass %, Sb: 0.001-0.1 mass %, Ca: 0.001-0.02 mass % and Mg: 0.001-0.02 mass % as required.

Disclosed are a non-oriented electrical steel plate with low iron loss and high magnetic conductivity and a manufacturing process therefor. The casting blank of the steel plate comprises the following components: Si: 0.1-2.0 wt %, Al: 0.1-1.0 wt %, Mn: 0.10-1.0 wt %, C: ≦0.005 wt %, P: ≦0.2 wt %, S: ≦0.005 wt %, N: ≦0.005 wt %, the balance being Fe and unavoidable impurities. The magnetic conductivity of the steel plate meets the following relationship formula: μ₁₀+μ₁₃+μ₁₅≧13982−586.5P_15/50; μ₁₀+μ₁₃+μ₁₅≧10000, wherein P_15/50 is the iron loss at a magnetic induction intensity of 1.5 T at 50 Hz; μ₁₀, μ₁₃, and μ₁₅ are relative magnetic conductivities at induction intensities of 1.0 T, 1.3 T, and 1.5 T at 50 Hz, respectively. The steel plate can be used for manufacturing highly effective and ultra-highly effective electric motors.

The invention discloses a non-oriented electrical steel plate with the extremely-low iron loss. The non-oriented electrical steel plate is prepared from the chemical elements including, by mass, morethan 0 and less than or equal to 0.005% of C, 1.0%-3.45% of Si, 0.1%-1.2% of Mn, 0.001%-2.0% of Al, 0-0.2% of Cu, 0-0.0015% of Ti, one or both of Sb and Sn with the total content ranging from 0.005% to 0.2%, one or more of Ca, Mg and RE with the total content ranging from 0.0005% to 0.01% and the balance Fe and other inevitable impurities. Besides, the invention discloses a continuous annealing process of the non-oriented electrical steel plate with the extremely-low iron loss. In addition, the invention discloses a manufacturing method of the non-oriented electrical steel plate with the extremely-low iron loss. The method includes the following steps that smelting is performed; casting is performed; hot rolling is performed; normalizing is performed; cold rolling is performed; the continuous annealing process is carried out; and the plate is coated with an insulating coating, so that the non-oriented electrical steel plate with the extremely-low iron loss is obtained.

The invention discloses a casting slag remover. A casting composite slag remover consists of pre-treated expanded perlite and a composite additive, wherein the composite additive comprises the following components of, in parts by weight, 2-40 parts of quartz sand powder, 0.1-10 parts of iron ore tailing powder, 5-40 parts of magnesia powder and 35-60 parts of sodium bentonite powder, and the weight ratio of the pre-treated expanded perlite to the composite additive is 80-95: 5-20. The casting composite slag remover can be used for correspondingly selecting and adjusting the use ratio accordingto different situations such as casting alloy types, casting processes, casting sizes and the like. The casting composite slag remover has the characteristics of strong adhesion to molten slag, highslag collecting layer strength, difficult crushing during slagging off, high slag removal efficiency and the like. The casting composite slag remover can also be used as a nonferrous alloy casting slag remover.

A permanent-magnet brushless direct-current hub motor having high efficiency and low material loss for an electric vehicle comprises a stator assembly and a rotor assembly, wherein the stator assembly comprises a fixed support and a stacked stator steel sheet, the stacked stator steel sheet is formed by laminating a plurality of silicon steel sheets and comprises tooth parts and a tooth groove part, the tooth part comprise tooth ribs and a tooth yoke, the tooth groove part is composed of a semi-closing inner cavity formed between every two tooth parts, a single silicon steel sheet is provided with an automatic-buckling groove, the tooth groove part is of a semi-closing pear-shaped groove structure, a first Hall groove, a second Hall groove and a third Hall groove are arranged on the stacked stator steel sheet, and the stator assembly comprises a rim arranged at the periphery, a magnetic conduction ring and a plurality of magnetic steel sheets. By the permanent-magnet brushless direct-current hub motor, the pole groove ratio is optimized, the performance is improved, the usage of magnetic steel and an enameled wire is reduced, cost is saved, the installation positions of the Hall grooves and the winding mode are optimized, the production efficiency is improved, and the installation accuracy is enhanced.

Provided are: a grain-oriented electromagnetic steel sheet exhibiting excellent coating film adhesion and excellent magnetic characteristics; and a method for producing this grain-oriented electromagnetic steel sheet. This grain-oriented electromagnetic steel sheet is provided with a ceramic coating film arranged on a steel sheet, and an oxide insulating tension coating film arranged on the ceramic coating film. The ceramic coating film contains a nitride and an oxide; the nitride contains at least one element selected from the group consisting of Cr, Ti, Zr, Mo, Nb, Si, Al, Ta, Hf, W and Y; and the oxide has a corundum crystal structure. The Young's modulus of the ceramic coating film as determined by a nanoindentation method is 230 GPa or more; the average film thickness of the ceramic coating film is from 0.01 μm to 0.30 μm (inclusive); and the tension of the oxide insulating tension coating film is 10 MPa or more.

The object of the present invention is to provide a low iron loss and low noise grain-oriented electrical steel sheet for securing both low core loss and low noise of a transformer at the same time.

The present invention relates to a grain-oriented electrical steel sheet containing Si: 1.0-4.0 wt % produced by controlling, with regard to ε_O, which is defined as a 0-p value when a grain-oriented electrical steel sheet is magnetized up to a saturated magnetic flux density, and ε₁₇, which is defined as the value obtained by subtracting a 0-p value at the magnetization magnetic flux density of 1.7 T from a 0-p value at a saturated magnetic flux density, ε_OC and ε_17L, which are absolute values deviated by forming a tension film and a forsterite film, and ε_OL and ε_17L, which are absolute values deviated by irradiating laser after the film formation, in adequate ranges respectively, and further controlling λ₁₇, which is a 0-p value at the magnetization magnetic flux density of 1.7 T, in the most appropriate range, when measuring a 0-p value of magnetostriction vibration in the rolling direction.

In a method for producing a grain-oriented electrical steel sheet by hot rolling a raw steel material containing C: 0.002˜0.10 mass %, Si: 2.0˜8.0 mass % and Mn: 0.005˜1.0 mass % to obtain a hot rolled sheet, subjecting the hot rolled sheet to a hot band annealing as required and further to one cold rolling or two or more cold rollings including an intermediate annealing therebetween to obtain a cold rolled sheet having a final sheet thickness, subjecting the cold rolled sheet to a primary recrystallization annealing combined with decarburization annealing, applying an annealing separator to the steel sheet surface and then subjecting to a final annealing, when rapid heating is performed at a rate of not less than 50° C./s in a range of 100˜700° C. in the heating process of the primary recrystallization annealing, the steel sheet is subjected to a holding treatment at any temperature of 250˜600° C. for 0.5˜10 seconds 2 to 6 times to thereby obtain a grain-oriented electrical steel sheet being low in the iron loss and small in the deviation of the iron loss value.

When a non-oriented electrical steel sheet is produced by hot rolling a slab containing, by mass %, C: not more than 0.0050%, Si: 1.5-5.0%, Mn: 0.20-3.0%, sol. Al: not more than 0.0050%, P: not more than 0.2%, S: not more than 0.0050% and N: not more than 0.0040% to form a hot rolled sheet, cold rolling the hot rolled sheet without conducting a hot band annealing and then subjecting to a finish annealing, a compositional ratio of CaO in oxide-based inclusions existing in the slab defined by CaO/(SiO₂+Al₂O₃+CaO) is set to not less than 0.4 and/or a compositional ratio of Al₂O₃ defined by Al₂O₃/(SiO₂+Al₂O₃+CaO) is set to not less than 0.3, and a coiling temperature in the hot rolling is set to not lower than 650° C.

An Fe-based amorphous alloy ribbon reduced in iron loss, less deformed, and highly productive in a condition of a magnetic flux density of 1.45 T is provided. One aspect of the present disclosure provides an Fe-based amorphous alloy ribbon having first and second surfaces, and is provided with continuous linear laser irradiation marks on at least the first surface. Each linear laser irradiation mark is formed along a direction orthogonal to a casting direction of the Fe-based amorphous alloy ribbon, and has unevenness on its surface. When the unevenness is evaluated in the casting direction, a height difference HL×width WA calculated from the height difference HL between a highest point and a lowest point in a thickness direction of the Fe-based amorphous alloy ribbon and the width WA which is a length of the linear irradiation mark on the first surface is 6.0 to 180 μm².