CN113215473A - Non-oriented electrical steel for hub motor of portable electric bicycle and manufacturing method thereof - Google Patents

Non-oriented electrical steel for hub motor of portable electric bicycle and manufacturing method thereof Download PDF

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CN113215473A
CN113215473A CN202110332173.3A CN202110332173A CN113215473A CN 113215473 A CN113215473 A CN 113215473A CN 202110332173 A CN202110332173 A CN 202110332173A CN 113215473 A CN113215473 A CN 113215473A
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electrical steel
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CN113215473B (en
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刘青松
裴英豪
施立发
夏雪兰
何志坚
程国庆
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Maanshan Iron and Steel Co Ltd
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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
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
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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
    • C—CHEMISTRY; METALLURGY
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    • C21D6/00—Heat treatment of ferrous alloys
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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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
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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
    • 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
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
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    • 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%
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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

Abstract

The invention discloses non-oriented electrical steel for a hub motor of a portable electric bicycle and a manufacturing method thereof, belonging to the field of non-oriented steel. Aiming at the problems of high processing difficulty and low efficiency of the existing non-oriented steel for the small-sized motor, the invention provides the non-oriented electrical steel for the hub motor of the portable electric bicycle, which comprises the following components in percentage by weight: si: 1.50% -3.00%; and Als: 0.50% -2.00%; mn: 0.20 to 1.00 percent; p: 0.01 to 0.20 percent; c: less than or equal to 0.005% S: less than or equal to 0.03 percent; n: less than or equal to 0.03 percent; ti: less than or equal to 0.005 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.01%. The invention improves the ductility of the silicon steel by reasonably controlling the element content, and is convenient for processing. The manufacturing method provided by the invention reduces eddy current and hysteresis loss in the wound iron core, can avoid surface oxidation and surface nitride precipitation of the steel coil, reduces the iron core loss, and has higher elongation and more excellent subsequent cold processing performance compared with the existing non-oriented silicon steel with the same iron loss grade. The processing is convenient while the excellent performance is ensured.

Description

Non-oriented electrical steel for hub motor of portable electric bicycle and manufacturing method thereof
Technical Field
The invention belongs to the technical field of non-oriented steel production, and particularly relates to non-oriented electrical steel for a hub motor of a portable electric bicycle and a manufacturing method thereof.
Background
The popularization of green trip makes electric bicycle become one of the important vehicle of trip, and portable electric bicycle is because the use of various new technological new materials, and compared with traditional electric bicycle, volume is littleer, weight is lighter, the structure is more firm durable, receives more and more popular by consumers. At present, an outer rotor type permanent magnet brushless direct current motor is generally adopted by a hub motor of an electric bicycle, and the iron loss of a stator of the motor is formed by rolling and folding non-oriented electrical steel with the thickness of 0.35-0.6 mm. The portable electric bicycle hub motor has smaller diameter and faster rotating speed, and the loss of the motor iron core is relatively higher; meanwhile, the non-oriented electrical steel is easy to crack in the coiling and stacking process due to the large curvature in the coiling process, and the processing efficiency is influenced. The performance of the conventional non-oriented electrical steel sheet is difficult to meet the high-efficiency working and processing requirements of the hub motor of the portable electric bicycle.
Corresponding improvement is also carried out aiming at the problems, for example, Chinese patent application No. CN201610007685.1, the publication date is 2016, 4, 13, which discloses a preparation method of a motor stator wound core and a blank strip material thereof, a section of straight groove is arranged at a yoke part of each tooth groove of the strip material with processed tooth grooves, and the straight groove is communicated with the bottom of the tooth groove; the yoke part of each tooth socket is provided with a section of transverse slot which is perpendicular to and contacted with the straight slot. The disadvantages of the patent are that: although the flatness reduction caused by curvature change in the iron core winding and stacking process is reduced by increasing the transverse and longitudinal slots of the stator strip, the iron core winding and stacking diameter can be effectively reduced, the punching stress of the middle edge part of the iron core is increased and the iron core loss is increased due to the longer cutting length of the strip.
Also, for example, chinese patent application No. CN202010659958.7, published as 10/16/2020, discloses a non-oriented electrical steel sheet with excellent magnetic properties and a method for manufacturing the same, wherein chemical components of the non-oriented electrical steel sheet with excellent magnetic properties are controlled in the following ranges by mass percent: c: 0-0.004%, Si: 0.2-2.0%, Mn: 0.2-1.0%, S: 0.005-0.025%, Al: 0.2-1.2%, N: 0-0.005%, O: 0-0.005%, Cu: 0.005-0.02%, Ca: 0.0003 to 0.0035 percent, wherein the total content of Si and Al is 0.5 to 2.6 percent, and the balance is Fe and inevitable impurities. The smelting method comprises the following steps: the first step is that the blast furnace molten iron and the molten iron are pretreated, smelted in a converter, RH refined and continuously cast; step two, hot rolling processing, rough rolling, finish rolling and coiling; step three, hot rolling, acid washing, continuous rolling, coiling, cold rolling, front cleaning, continuous annealing, rear cleaning and insulating coating. The disadvantages of the patent are that: although the magnetic property is excellent, the processability is poor, and the stable production is not facilitated.
Disclosure of Invention
1. Problems to be solved
The invention provides non-oriented electrical steel for a hub motor of a portable electric bicycle and a manufacturing method thereof, aiming at the problems of high processing difficulty and low efficiency of the existing non-oriented steel for a small motor. The invention improves the ductility of the silicon steel by reasonably controlling the element content, and is convenient for subsequent processing. The manufacturing method provided by the invention reduces eddy current and hysteresis loss in the wound iron core, and can avoid surface oxidation and surface nitride precipitation of the steel coil and reduce the iron core loss. Compared with the existing non-oriented silicon steel with the same iron loss grade, the elongation is higher, the subsequent cold processing performance is more excellent, the processing is convenient while the excellent performance is ensured, and the processing efficiency is improved.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 1.50% -3.00%; and Als: 0.50% -2.00%; mn: 0.20 to 1.00 percent; p: 0.01 to 0.20 percent; c: less than or equal to 0.005% S: less than or equal to 0.03 percent; n: less than or equal to 0.03 percent; ti: less than or equal to 0.005 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.01%.
Furthermore, the paint comprises the following components in percentage by weight: si: 1.80% -2.60%; and Als: 0.90% -1.80%; mn: 0.30% -0.60%; p: 0.05 percent to 0.10 percent; c: less than or equal to 0.003 percent; s: less than or equal to 0.02 percent; n: less than or equal to 0.01 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.0085%.
A method for manufacturing the non-oriented electrical steel for the hub motor of the moped, which comprises the following steps: casting molten steel prepared from all components to form a plate blank, heating and preserving the plate blank, coiling after hot rolling and cooling, normalizing, pickling, cold rolling, annealing in a protective gas atmosphere, coating an insulating layer and solidifying to finally prepare the non-oriented electrical steel for the hub motor of the portable electric bicycle; the total reduction rate is controlled to be 85-90% in the cold rolling process; in the annealing process, the annealing temperature is controlled to be 890-990 ℃, the time is 180-350 s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, and the tension of the cold-rolled coil in the annealing furnace is controlled to be 2.8-3.6 Mpa.
Furthermore, the slab heating is carried out in a stepping heating furnace, the heating temperature is controlled to be 1000-1150 ℃, and the heat preservation time is 100-230 min.
Furthermore, the hot rolling finishing temperature is controlled to be 800-900 ℃ in the coiling process after the hot rolling cooling, and the coiling is carried out after the cooling is carried out to 550-700 ℃.
Furthermore, the hot rolling comprises five times of rough rolling until the thickness is 32-45 mm, and then seven times of finish rolling until the thickness is 1.8-2.5 mm.
Furthermore, the normalizing temperature is controlled to be 820-950 ℃ in the normalizing process, and the time is 2-5 min.
Furthermore, the curing condition is 450-650 ℃, the time is 30-70 s, and the thickness of the insulating layer is controlled to be 0.3-1.5 μm.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the method ensures that the total amount of the three elements of Si, Als and Mn is controlled to be 3.0-5.0%, ensures that the non-oriented electrical steel product has lower iron loss performance and further can improve the efficiency of the hub motor of the electric bicycle, and on the basis, the contents of Mn and Als are improved, so that lower loss can be obtained, and meanwhile, good elongation and cold deformation performance are ensured; the thinner finished product thickness can effectively reduce eddy current and hysteresis loss in the wound iron core; the surface oxidation and surface nitride precipitation of the steel plate are avoided by the strong reducing atmosphere, and the iron core loss is effectively reduced; compared with the existing non-oriented silicon steel with the same iron loss grade, the elongation is higher, and the subsequent cold processing performance is more excellent;
(2) according to the invention, the thickness of the steel coil is reduced by controlling the total rolling reduction rate of cold rolling, the deformation of the steel plate in the subsequent winding process can be reduced, the risk of deterioration of electromagnetic performance caused by cold machining is reduced, and the machining fracture tendency caused by winding of the small-diameter iron core can be effectively relieved; meanwhile, a rapid heating process is adopted to achieve the purpose of reducing the iron loss; the oxygen content is controlled in the annealing process, so that the surface oxidation of the high-temperature annealed steel coil is avoided, an inner nitride layer is further formed, and the hysteresis loss is increased; controlling the tension of the steel coil in the annealing furnace to improve the transverse electromagnetic performance of the steel coil;
(3) the invention uses electromagnetic stirring in the whole process of continuous casting of molten steel to obtain equiaxed grains with higher proportion; meanwhile, a high-temperature process is preferentially adopted in the normalizing process to improve the magnetic induction; controlling the curing temperature and time to ensure that the resistance between two surfaces of the steel coil is 150-800 omega.mm2The thickness of the insulating layer is controlled within a certain thickness range, so that the iron core has a good lamination coefficient after lamination, and the eddy current loss of the iron core is further reduced;
(4) iron loss P in performance of non-oriented electrical steel product for hub motor of portable electric bicycle prepared by the invention1.5/50≤2.35W/kg；B5000Not less than 1.65T; the yield strength Rp0.2 is less than or equal to 350MPa, the elongation delta is more than or equal to 25 percent, the grain size rating in the product structure is 3.0 grade, the average grain size reaches 125 mu m, the stable processing of the non-oriented electrical steel is realized, and the processing efficiency is improved.
Drawings
FIG. 1 is a structural configuration diagram in example 1;
FIG. 2 is a structural configuration diagram in example 2.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 1.50% -3.00%; and Als: 0.50% -2.00%; mn: 0.20 to 1.00 percent; p: 0.01 to 0.20 percent; c: less than or equal to 0.005% S: less than or equal to 0.03 percent; n: less than or equal to 0.03 percent; ti: less than or equal to 0.005 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.01%. Wherein the functions of the components are as follows:
si, Mn and Als: the three elements all belong to alloy elements in non-oriented electrical steel, the electrical resistivity is improved and the iron loss is reduced along with the increase of the content of Si element for magnetism, and the electrical steel becomes more and more brittle along with the increase of the content of Si element for plasticity of silicon steel, is difficult to roll and deform, and reduces the thermal conductivity. The addition of Mn can increase the texture proportion of the {100} and {110} surfaces in the structure, reduce the texture proportion of the {111} surface, improve the magnetism, improve the plasticity of the high-silicon steel and improve the elongation. The addition of Als can improve the magnetism of the silicon steel, and meanwhile, the Al alloy has an obvious effect of improving the plasticity of the silicon steel, the ductile-brittle transition temperature of the alloy can be obviously improved, but the titanium in the steel slag is easily reduced by the higher aluminum element in the smelting process, and the Al alloy has certain harm to the magnetism of the silicon steel. Therefore, the ductility of the steel plate can be improved under the condition of ensuring low iron loss by improving the contents of Mn and Als on the premise of ensuring that the total amount of the three elements is 3.0-5.0%, when the total amount of the three elements is too low, the resistivity in the silicon steel is reduced, the eddy current loss is increased, the total loss is increased, and the motor efficiency is reduced; when the total amount of the three elements is higher, the total iron loss of the silicon steel is reduced, but the difference of the transverse and longitudinal iron loss performance is increased, the plastic deformation capacity in the subsequent winding processing process is insufficient due to the reduction of the metal elongation, and the problem of processing fracture is easy to occur; meanwhile, the higher alloy elements of the silicon steel cause the trend of deterioration of magnetic performance in the plastic deformation process to be increased, and the total loss is increased; therefore, the total amount of the three elements is ensured to be 3.0-5.0%;
p: the P element can effectively reduce the gamma phase region of the electrical steel, promote the growth of crystal grains, and effectively improve the mechanical property of the product by proper P content. If the content exceeds 0.1 percent, the embrittlement effect of the material is enhanced, the cold rolling and subsequent blanking performance are influenced, and the bending frequency is reduced, so the content of P is controlled to be 0.01 to 0.20 percent;
C. s, N and Ti: four elements in the electrical steel belong to harmful elements, and when the content of C exceeds 0.005 percent, the iron loss is obviously increased, and the magnetic aging is obvious; s and N are easy to form second phase inclusions such as MnS, Cu2S and AlN in the electrical steel, so that the growth of crystal grains is strongly hindered, and the iron loss is increased; the Ti element has a strong influence on the electromagnetic performance of the non-oriented electrical steel, and precipitated TiC and TiN inclusions seriously hinder the grain growth, so that the iron loss is greatly increased, and the lower the C, Ti content is, the better the iron loss is in principle.
Furthermore, in order to reduce the iron loss performance difference of the non-oriented electrical steel product under different frequencies, the components of the non-oriented electrical steel for the hub motor of the light electric bicycle are further limited, and the non-oriented electrical steel comprises the following components in percentage by weight: si: 1.80% -2.80%; and Als: 0.80 to 1.80 percent; mn: 0.30 to 0.80 percent; p: 0.05 percent to 0.10 percent; c: less than or equal to 0.003 percent; s: less than or equal to 0.02 percent; n: less than or equal to 0.01 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.0085%.
A method for manufacturing the non-oriented electrical steel for the hub motor of the moped, which comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting design requirements into a plate blank with the thickness of 200-280 mm, and improving the isometric crystal proportion of the plate blank by using electromagnetic stirring in a crystallizer in the continuous casting process;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; controlling the heating temperature to be 1000-1150 ℃, and keeping the temperature for 100-230 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to be 800-900 ℃ in the coiling process after the hot rolling cooling, and carrying out coiling after laminar cooling to 550-700 ℃; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 32-45 mm, and then seven times of finish rolling until the thickness is 1.8-2.5 mm;
normalizing: controlling the normalizing temperature to be 820-950 ℃ and the time to be 2-5 min in the normalizing process, and preferably adopting a high-temperature process to improve the magnetic induction;
acid washing: acid washing is carried out in a turbulent acid tank;
cold rolling: the total reduction rate is controlled to be 85-90% in the cold rolling process, the cold rolling is carried out to the target thickness, the target thickness is 0.27mm, the deformation of a steel plate in the subsequent winding process can be reduced due to the reduction of the thickness, the risk of deterioration of the electromagnetic performance caused by cold machining is reduced, and the machining fracture tendency caused by the winding of the small-diameter iron core can be effectively relieved;
annealing in a protective gas atmosphere: in the annealing process, the annealing temperature is controlled to be 890-990 ℃, the time is 180-350 s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, and the tension of the cold-rolled coil in the annealing furnace is controlled to be 2.8-3.6 Mpa. The reasonable matching of the annealing temperature and the annealing time ensures that the non-oriented silicon steel has good electromagnetic performance and simultaneously has lower strength and higher elongation, the low-temperature annealing temperature is preferentially adopted on the basis of ensuring the low iron loss performance, the silicon steel is ensured to have smaller average grain size, and then the yield strength of the silicon steel is reduced and the elongation is improved. Strictly controlling the tension of the steel coil in the annealing furnace, and preferentially adopting a low-tension process to ensure that the steel coil has low angular orientation difference (001)<021>、{001}<100>The grain increase of the texture is facilitated, the proportion of the texture is increased, the concentration degree of the texture is reduced, and the transverse electromagnetic performance of the silicon steel is improved. The annealing furnace is filled with 30-55% H2、N2The mixed gas is used for protection, and the oxygen content is strictly controlled to avoid the oxidation of the surface of the high-temperature annealed steel coil so as to form an inner nitriding layer to increase the hysteresis loss. It is worth explaining that in the prior art, when the tension in the annealing furnace is small, the risk of poor shape of the silicon steel plate and deviation in the furnace is increased, and when the tension in the furnace is large, the internal stress of the silicon steel plate in the rolling direction is increased, and the difference between the transverse iron loss and the longitudinal iron loss is increased. In the production process, in order to prevent the deviation of the strip steel in the furnace, the control is usually carried out by increasing the tension (generally more than or equal to 4Mpa) in the furnace. The non-oriented silicon steel has the iron loss which is firstly reduced and then increased along with the increase of unit tension, and the difference between the transverse iron loss and the longitudinal iron loss is gradually increased. The external tension applied in the annealing process has obvious promotion effect on the grain boundary migration, so that when the unit tension is less than 4MPa, the average grain size is increased along with the increase of the unit tension, the hysteresis loss is reduced, and the total iron loss is reduced; when the external tension is increased, the plastic deformation of the metal caused by the tension reduces the softening effect of recrystallization to prevent the crystal grains from growing, and when the unit tension is more than 4MPa, the average crystal grain size reduces and the iron loss increases. In order to ensure that the silicon steel has good plate shape and excellent transverse iron loss performance, the optimal unit tension in the continuous annealing process is controlled to be 2.8-3.6 MPa.
Coating an insulating layer and curing: the curing condition is that the temperature is 450-650 ℃, the time is 30-70 s, and the resistance between two surfaces of the steel plate is 150-800 omega mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the hub motor of the portable electric bicycle prepared by the components and the manufacturing method of the invention is not easy to break and P is not easy to generate in the winding process1.5/50≤2.35W/kg；B5000Not less than 1.65T; the yield strength Rp0.2 is less than or equal to 350MPa, the elongation delta is more than or equal to 25 percent, and simultaneously, as shown in figure 1, the grain size grade in the product structure is 3.0 grade, and the average grain size reaches 125 mu m. The stable processing of non-oriented electrical steel in the small motor is realized, and the processing efficiency is improved.
Example 1
As shown in FIG. 1, the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 2.38 percent; and Als: 1.21 percent; mn: 0.45 percent; p: 0.07 percent; c: less than or equal to 0.0, 3% S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0082%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 200 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to 860 ℃ in the coiling process after the hot rolling cooling, cooling to 660 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.2 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.7%;
annealing in a protective gas atmosphere: controlling the annealing temperature at 940 deg.C for 320s, controlling the oxygen content in the annealing furnace to be lower than 80ppm, controlling the tension of the cold-rolled coil in the annealing furnace to be 3.04Mpa, and controlling the oxygen content in the annealing furnace to be 35% H2+65％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is that the temperature is 520 ℃ and the time is 36s, so that the resistance between two surfaces of the steel plate is 150-800 omega mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.31W/Kg, magnetic induction B5000The yield strength Rp0.2 is 309MPa, the elongation delta is 28.0 percent, the surface insulation of the steel coil is better, and the steel coil has good magnetic property and extensibility.
Example 2
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 2.43 percent; and Als: 1.11 percent; mn: 0.38 percent; p: 0.06 percent; c: less than or equal to 0.0028 percent S: less than or equal to 0.0028 percent; n: less than or equal to 0.0028 percent; ti: less than or equal to 0.0028 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0080%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1130 ℃, and the heat preservation time is 200 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to be 850 ℃ in the coiling process after the hot rolling cooling, cooling to 650 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.15 mm;
normalizing: controlling the normalizing temperature to 875 ℃ and the normalizing time to 145s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.4%;
annealing in a protective gas atmosphere: in the annealing process, the annealing temperature is controlled to 950 ℃, the annealing time is 320s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, the tension of the cold-rolled coil in the annealing furnace is controlled to be 3.10Mpa, and the annealing furnace is filled with 35% H2+65％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is 500 ℃ for 34 s; and the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.29W/Kg, magnetic induction B50001.66T, 324MPa of yield strength Rp0.2 and 27.6 percent of elongation delta, and has good surface insulation property of a steel coilGood magnetic property and extensibility.
Example 3
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 2.34 percent; and Als: 1.01 percent; mn: 0.40 percent; p: 0.07 percent; c: less than or equal to 0.003 percent of S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0074%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 210 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to 860 ℃ in the coiling process after the hot rolling cooling, cooling to 645 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.1 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.1%;
annealing in a protective gas atmosphere: controlling the annealing temperature to 960 ℃ and the annealing time to 320s in the annealing process, controlling the oxygen content in the annealing furnace to be lower than 80ppm, and controlling the cold-rolled coil to be in a cold-rolled stateThe tension in the annealing furnace is 3.08Mpa, and the annealing furnace is filled with 38% H2+62％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is 480 ℃ for 36s, and the resistance between two surfaces of the steel plate is ensured to be 150-800 omega.mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.33W/Kg, magnetic induction B5000The steel coil has the advantages of 1.65T, yield strength Rp0.2 of 298MPa, elongation delta of 26.3 percent, good surface insulation of the steel coil, and good magnetic property and extensibility.
Example 4
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 1.50 percent; and Als: 2.00 percent; mn: 1.00 percent; p: 0.01 percent; c: less than or equal to 0.003 percent of S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0074%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 210 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to 860 ℃ in the coiling process after the hot rolling cooling, cooling to 645 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.1 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.1%;
annealing in a protective gas atmosphere: in the annealing process, the annealing temperature is controlled to be 960 ℃, the time is 320s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, the tension of the cold-rolled coil in the annealing furnace is controlled to be 3.08MPa, and the annealing furnace is filled with 38% H2+62％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is 480 ℃ for 36s, and the resistance between two surfaces of the steel plate is ensured to be 150-800 omega.mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.32W/Kg, magnetic induction B5000The yield strength Rp0.2 is 287MPa, the elongation delta is 29.4 percent, and the steel coil has good surface insulation property, good magnetic property and good extensibility.
Example 5
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 3.00 percent; and Als: 0.50 percent; mn: 0.20 percent; p: 0.20 percent; c: less than or equal to 0.003 percent of S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0074%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 210 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to 860 ℃ in the coiling process after the hot rolling cooling, cooling to 645 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.1 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.1%;
annealing in a protective gas atmosphere: in the annealing process, the annealing temperature is controlled to be 960 ℃, the time is 320s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, the tension of the cold-rolled coil in the annealing furnace is controlled to be 3.08MPa, and the annealing furnace is filled with 38% H2+62％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is 480 ℃ for 36s, and the resistance between two surfaces of the steel plate is ensured to be 150-800 omega.mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.34W/Kg, magnetic induction B50001.67T, yield strength Rp0.2 of 336MPa, elongation delta of 25.7 percent, good surface insulation of the steel coil and good surface insulation of the steel coilGood magnetic property and extensibility.
Example 6
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 1.80 percent; and Als: 1.80 percent; mn: 0.30 percent; p: 0.10 percent; c: less than or equal to 0.003 percent of S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0074%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 210 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to 860 ℃ in the coiling process after the hot rolling cooling, cooling to 645 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.1 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.1%;
annealing in a protective gas atmosphere: controlling the annealing temperature to 960 ℃ and the annealing time to 320s in the annealing process, controlling the oxygen content in the annealing furnace to be lower than 80ppm, and controlling the cold-rolled coil to be in a cold-rolled stateThe tension in the annealing furnace is 3.08Mpa, and the annealing furnace is filled with 38% H2+62％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is 480 ℃ for 36s, and the resistance between two surfaces of the steel plate is ensured to be 150-800 omega.mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.29W/Kg, magnetic induction B5000The yield strength Rp0.2 is 324MPa, the elongation delta is 27.6 percent, the surface insulation of the steel coil is better, and the steel coil has good magnetic property and extensibility.
Example 7
The non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 2.80 percent; and Als: 0.80 percent; mn: 0.80 percent; p: 0.05 percent; c: less than or equal to 0.003 percent of S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0074%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 210 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to 860 ℃ in the coiling process after the hot rolling cooling, cooling to 645 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.1 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, six times of cold rolling are carried out until the target thickness is 0.27mm, and the total reduction rate is controlled to be 87.1%;
annealing in a protective gas atmosphere: in the annealing process, the annealing temperature is controlled to be 960 ℃, the time is 320s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, the tension of the cold-rolled coil in the annealing furnace is controlled to be 3.08MPa, and the annealing furnace is filled with 38% H2+62％N2Protecting the mixed gas;
coating an insulating layer and curing: the curing condition is 480 ℃ for 36s, and the resistance between two surfaces of the steel plate is ensured to be 150-800 omega.mm2(ii) a And the thickness of the insulating layer is controlled to be 0.3-1.5 mu m, and finally the non-oriented electrical steel for the hub motor of the portable electric bicycle is manufactured.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has excellent surface quality and finished iron loss P1.5/502.23W/Kg, magnetic induction B5000The yield strength Rp0.2 is 328MPa, the elongation delta is 26.7 percent, the surface insulation of the steel coil is better, and the steel coil has good magnetic property and extensibility.
Comparative example 1
As shown in FIG. 2, the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following components in percentage by weight: si: 1.23 percent; and Als: 0.42 percent; mn: 0.28 percent; p: 0.04 percent; c: less than or equal to 0.003 percent of S: less than or equal to 0.003 percent; n: less than or equal to 0.003 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% + 0.0080%.
The method for manufacturing the non-oriented electrical steel for the hub motor of the portable electric bicycle comprises the following steps:
casting molten steel prepared from the components to form a plate blank: molten iron enters a converter for smelting after pretreatment, molten steel smelted by the converter is subjected to decarburization and alloying treatment by an RH furnace, and alloying elements such as Si, Al, Mn, P and the like are finely adjusted according to component design requirements; continuously casting molten steel with components meeting the design requirements into a plate blank with the thickness of 230 mm;
heating and heat preservation of the plate blank: the heating of the continuously cast plate blank is carried out in a stepping heating furnace, the energy consumption of the stepping heating furnace is low, and the operation is flexible and convenient; the tapping temperature is 1110 ℃, and the heat preservation time is 210 min;
coiling after hot rolling and cooling: controlling the hot rolling finishing temperature to be 840 ℃ in the coiling process after the hot rolling cooling, cooling to 650 ℃ after water cooling and air cooling, and then coiling; specifically, the hot rolling process comprises five times of rough rolling until the thickness is 38mm, and then seven times of finish rolling until the thickness is 2.15 mm;
normalizing: controlling the normalizing temperature to 870 ℃ and the normalizing time to 150s in the normalizing process;
acid washing: pickling the surface of the steel coil in a turbulent acid tank by using hydrochloric acid with the mass concentration of 58%;
cold rolling: in the cold rolling process, the target thickness is 0.35mm through five times of cold rolling, and the total reduction rate is controlled to be 83.7%;
annealing in a protective gas atmosphere: controlling the annealing temperature at 950 deg.C for 320s, controlling the oxygen content in the annealing furnace to be lower than 80ppm, controlling the tension of the cold-rolled coil in the annealing furnace to be 3.05Mpa, and controlling the oxygen content in the annealing furnace to be 20% H2+80％N2Protecting the mixed gas;
coating an insulating layer and curing: curing at 450 ℃ for 34s, and controlling the thickness of the insulating layer to be 0.3-1.5 mu m, and finally preparing the non-oriented electrical steel for the hub motor of the portable electric bicycle.
The non-oriented electrical steel for the super-efficient fixed-frequency compressor manufactured by the process has poor surface quality and finished product iron loss P1.5/502.63W/Kg, magnetic induction B50001.68T, 275MPa of yield strength Rp0.2 and 23.8 percent of elongation delta, good surface insulation of the steel coil, relatively poor electromagnetic property and ductility, portability and electromotionThe bicycle hub motor iron core is broken in the winding process because the plastic deformation required by the small-diameter winding processing cannot be supported by the material ductility.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims (8)

1. The utility model provides a light electric bicycle wheel hub non-oriented electrical steel for motor which characterized in that: comprises the following components in percentage by weight: si: 1.50% -3.00%; and Als: 0.50% -2.00%; mn: 0.20 to 1.00 percent; p: 0.01 to 0.20 percent; c: less than or equal to 0.005% S: less than or equal to 0.03 percent; n: less than or equal to 0.03 percent; ti: less than or equal to 0.005 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.01%.
2. The non-oriented electrical steel for a hub motor of a moped as claimed in claim 1, wherein: comprises the following components in percentage by weight: si: 1.80% -2.80%; and Als: 0.80 to 1.80 percent; mn: 0.30 to 0.80 percent; p: 0.05 percent to 0.10 percent; c: less than or equal to 0.003 percent; s: less than or equal to 0.02 percent; n: less than or equal to 0.01 percent; ti: less than or equal to 0.003 percent, and the balance of iron and inevitable impurities; wherein C, S, N and Ti are in weight percent satisfying the following formula: c% + S% + N% + Ti% < 0.0085%.
3. A method for manufacturing the non-oriented electrical steel for a hub motor of a moped as claimed in any one of claims 1-2, comprising the steps of: casting molten steel prepared from all components to form a plate blank, heating and preserving the plate blank, coiling after hot rolling and cooling, normalizing, pickling, cold rolling, annealing in a protective gas atmosphere, coating an insulating layer and solidifying to finally prepare the non-oriented electrical steel for the hub motor of the portable electric bicycle; the method is characterized in that: the total reduction rate is controlled to be 85-90% in the cold rolling process; in the annealing process, the annealing temperature is controlled to be 890-990 ℃, the time is 180-350 s, the oxygen content in the annealing furnace is controlled to be lower than 80ppm, and the tension of the cold-rolled coil in the annealing furnace is controlled to be 2.8-3.6 Mpa.
4. The method for manufacturing the non-oriented electrical steel for a hub motor of a moped according to claim 3, wherein the method comprises the following steps: the slab heating is carried out in a stepping heating furnace, the heating temperature is controlled to be 1000-1150 ℃, and the heat preservation time is 100-230 min.
5. The method for manufacturing the non-oriented electrical steel for a hub motor of a moped according to claim 3 or 4, wherein: and controlling the hot rolling finishing temperature to be 800-900 ℃ in the coiling process after the hot rolling cooling, cooling to 550-700 ℃, and then coiling.
6. The method for manufacturing the non-oriented electrical steel for the hub motor of the moped according to claim 5, wherein the method comprises the following steps: the hot rolling comprises five-pass rough rolling until the thickness is 32-45 mm, and then seven-pass finish rolling until the thickness is 1.8-2.5 mm.
7. The method for manufacturing the non-oriented electrical steel for a hub motor of a moped according to claim 3, wherein the method comprises the following steps: and controlling the normalizing temperature to be 820-950 ℃ in the normalizing process, and controlling the normalizing time to be 2-5 min.
8. The method for manufacturing the non-oriented electrical steel for a hub motor of a moped according to claim 3, wherein the method comprises the following steps: the curing condition is that the temperature is 450-650 ℃, the time is 30-70 s, and the thickness of the insulating layer is controlled to be 0.3-1.5 mu m.
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CN114058953A (en) * 2021-10-25 2022-02-18 马鞍山钢铁股份有限公司 Low-iron-loss non-oriented silicon steel suitable for winding processing and production method thereof
CN114737129A (en) * 2022-03-02 2022-07-12 新余钢铁股份有限公司 High-performance non-oriented silicon steel for wound motor iron core and production method thereof
CN114737129B (en) * 2022-03-02 2023-02-28 新余钢铁股份有限公司 High-performance non-oriented silicon steel for wound motor iron core and production method thereof

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