CN111575594B - Non-oriented electrical steel under low magnetic field and production method thereof - Google Patents

Non-oriented electrical steel under low magnetic field and production method thereof Download PDF

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CN111575594B
CN111575594B CN202010602892.8A CN202010602892A CN111575594B CN 111575594 B CN111575594 B CN 111575594B CN 202010602892 A CN202010602892 A CN 202010602892A CN 111575594 B CN111575594 B CN 111575594B
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程国庆
裴英豪
施立发
何志坚
占云高
胡柯
浦绍敏
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Maanshan Iron and Steel Co Ltd
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Abstract

The invention discloses non-oriented electrical steel under a low magnetic field and a production method thereof, belonging to the technical field of non-oriented electrical steel production. Aiming at the problem that the non-oriented electrical steel in the prior art has poor magnetization performance under a low magnetic field, the invention provides the non-oriented electrical steel under the low magnetic field, which comprises the following components in percentage by weight: c is less than or equal to 0.0020%, Si: 2.8-3.3%, Mn: 0.2-0.4%, P is less than or equal to 0.005%, Als: 0.2-0.9%, S is less than or equal to 0.001%, N is less than or equal to 0.0020%, Ti is less than or equal to 0.0015%, and the balance of iron and inevitable impurities. In the annealing step, a mode of quickly heating up, reducing cooling rate and prolonging heat preservation time in a thermal mode is adopted, and changes are made in the component source and the annealing step, so that the magnetic induction B is realized on the basis of the original high-grade components1000.3T is increased to reach the iron loss P1.5/50Less than or equal to 2.40W/kg, and magnetic induction B100≥1.2T，B5000The magnetic field strength is not less than 1.67T, the higher magnetization performance of the non-oriented steel under a low magnetic field is ensured, the whole method is simple and convenient to operate, the safety performance is high, and the production cost is low.

Description

Non-oriented electrical steel under low magnetic field and production method thereof
Technical Field
The invention belongs to the technical field of production of non-oriented electrical steel, and particularly relates to non-oriented electrical steel with stronger magnetization performance under a lower magnetic field and a production method thereof.
Background
The cold-rolled non-oriented electrical steel is generally and widely applied to the manufacture of iron cores of various motors such as small motors, compressors, new energy automobile driving motors and the like as a soft magnetic material, and has slightly different performance requirements in different application fields, but different motors have the requirements on high magnetic performance and good processing performance of the electrical steel. With the continuous progress of the motor manufacturing technology of downstream users, for example, the manufacturing process of high-efficiency compressors, servo motors and new energy drive motors puts forward the requirement of good magnetic performance and fast magnetization capability under a low magnetic field, particularly, the magnetization capability of an external magnetic field of which the H is about 100A/m, the magnetization strength of a 0.35mm high-grade on the market is about 0.8T, the reduced magnetization strength is not beneficial to the efficiency improvement of the motor at low rotating speed, and the conventional method adopted at present for solving the problem is to select a high-magnetic induction type high-grade product to improve the problem of low rotating speed efficiency.
Generally, the magnetic induction B is improved under the condition of not increasing the iron loss5000The method mainly has three aspects, namely, improving the purity of the molten steel; secondly, adding segregation elements such as Sn, Sb and the like; and thirdly, improving the curling temperature of the hot rolled plate. Three methods mainly promote B5000The magnetic induction of (A) is large, and the magnetization performance under low magnetic field is mainly concerned with B100The difference between the two is shown in FIG. 1, B5000Near the peak of magnetic induction, and B100Mainly the magnetic induction is at the rising value, the two are concerned differently, at B5000Under the condition of larger lifting B100The lift may not be significant. The first two methods greatly increase the cost to meet the low magnetic field performance, and the third method easily causes the pickling difficulty and is also applicable to B5000Is more pronounced but B100The lift is small. Along with the rapid development of the motor industry and the environment of cost reduction, the problem to be solved urgently is to produce the cold-rolled non-oriented electrical steel with stronger magnetization performance under low magnetic field so as to meet the higher requirements of downstream efficient compressor users.
For example, chinese patent application No. CN201280065207.6, entitled 10 and 24 days in 2017, discloses a non-oriented electrical steel sheet and a method for manufacturing the same. The non-oriented electrical steel sheet of the present invention comprises, in weight percent (%), 0.005% or less of C, 1.0 to 4.0% of Si, and Al: 0.1 to 0.8%, Mn 0.01 to 0.1%, P0.02 to 0.3%, N: 0.005% or less, 0.001-0.005% of S, Ti: 0.005% or less, at least one of Sn and Sb: 0.01 to 0.2%, and the balance being Fe and other unavoidable impurities, and the Mn, Al, P, and S satisfying the following formula: 0.8 ≦ { [ Mn ]/(100 x [ S ]) + [ Al ] }/[ P ] ≦ 40, wherein [ Mn ], [ Al ], [ P ], [ S ] respectively represent the weight percentages (%) of Mn, Al, P, S. The disadvantages of the patent are that: the content of elements is not easy to control, and the operation is more complicated.
As another example, chinese patent application No. CN201410458753.7, published as 9/11/2014, discloses a method for manufacturing a low-iron-loss high-magnetic-induction non-oriented electrical steel, wherein the electrical steel comprises the following chemical components in percentage by weight: c, 0.0045% of Si below: 0.2-0.4%, Mn: 0.15-0.40%, Als: less than or equal to 0.005 percent, less than or equal to 0.040 percent of P, less than or equal to 0.007 percent of S, less than or equal to 0.0030 percent of N, and the weight percentage of Sn: 0.1 to 0.4, and the balance Fe and inevitable impurities. In the production process of the electrical steel, the magnetic induction is improved by increasing the finish rolling temperature and the curling temperature, and the iron loss P can be obtained1.5At 2.8-13W/kg, magnetic induction B5000The non-oriented electrical steel finished product reaches 1.78-1.82T. The disadvantages of the patent are that: the preparation cost is high.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the non-oriented electrical steel in the prior art has poor magnetization performance under a low magnetic field, the invention provides the non-oriented electrical steel under the low magnetic field and a production method thereof. The content of harmful elements is controlled on a component source head, and the annealing step is carried out by adopting a mode of quickly heating, reducing the cooling rate and prolonging the heat preservation time in a thermal mode, so that the magnetic induction B is caused on the basis of the original high-grade components1000.3T is increased to reach the iron loss P1.5/50Less than or equal to 2.40W/kg, and magnetic induction B100≥1.2T，B5000The magnetic field strength is not less than 1.67T, the higher magnetization performance of the non-oriented steel under a low magnetic field is ensured, the whole method is simple and convenient to operate, the safety performance is high, and the production cost is low.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The non-oriented electrical steel under the low magnetic field comprises the following components in percentage by weight: c is less than or equal to 0.0020%, Si: 2.8-3.3%, Mn: 0.2-0.4%, P is less than or equal to 0.005%, Als: 0.2-0.9%, S is less than or equal to 0.001%, N is less than or equal to 0.0020%, Ti is less than or equal to 0.0015%, and the balance of iron and inevitable impurities, wherein: C. s, N and Ti satisfy the following formula: c% + S% + N% + Ti% < 0.0075%.
Furthermore, the paint comprises the following components in percentage by weight: c: 0.0019%, Si: 2.9%, Mn: 0.25%, P: 0.003%, Als: 0.85%, S: 0.001%, N: 0.0007%, Ti: 0.0015%, and the balance of iron and inevitable impurities.
A method for producing a non-oriented electrical steel at low magnetic field according to any of the above claims, comprising the steps of, in order: preparing a plate blank, heating the plate blank, hot rolling and coiling, normalizing and pickling, cold rolling, annealing and coating an insulating material, wherein the annealing comprises the following steps:
s1, heating the cold-rolled plate blank to a target temperature at a heating rate of more than or equal to 20 ℃/S, and then carrying out heat preservation;
s2, keeping the temperature for 40-100S, and cooling at a cooling speed of less than or equal to 10 ℃/S.
Furthermore, the annealing step is completed in an annealing furnace, and the furnace dew point of the annealing furnace is controlled to be-40 to-10 ℃.
Furthermore, the heating temperature in the slab heating is 1100-1200 ℃, and the heating and heat preservation time is more than or equal to 210 min.
Further, the finishing temperature of hot rolling in hot rolling coiling is 830 to 850 ℃.
Further, the plate blank is hot rolled into a hot rolled plate, and then cooled to 600-680 ℃ for coiling.
Furthermore, the normalizing temperature in the normalizing pickling is 850-950 ℃, the heat preservation time is 2-6 min, and hydrochloric acid pickling is adopted for pickling.
Furthermore, the cold rolling is performed for 5-6 times, and the total rolling reduction rate of the cold rolling is 75-85%.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adds C, S, N and Ti four elements by weight percent less than 0.0075%, because the four elements are harmful elements in steel, the content of the harmful elements is reduced, thereby effectively reducing MnS and Cu2S, AlN and other impurities are generated, so that the performance of the silicon steel is ensured; meanwhile, the generation of fine and stable Ti (CN) inclusions is reduced, the growth of crystal grains is prevented from being hindered, the {111} crystal grains in the finished steel are increased, and the {100} crystal grains are reduced, so that the finished steel has higher magnetization performance under a lower magnetic field;
(2) in the annealing step in the production of the non-oriented steel, the invention adopts the rapid temperature rise, the cooling rate reduction and the thermal mode to prolong the heat preservation time, and leads the magnetic induction B to be B on the basis of the original high-grade components1000.3T is increased to reach the iron loss P1.5/50Less than or equal to 2.40W/kg, and magnetic induction B100≥1.2T，B5000Not less than 1.67T; the whole production method is simple and convenient to operate and high in safety performance;
(3) the invention improves the heating rate of the annealing process, which is beneficial to the rapid growth of crystal grains, and simultaneously, the rapid heating weakens unfavorable gamma texture and strengthens alpha texture, thereby improving the magnetic performance of finished products; the internal stress in the sample plate can be reduced by reducing the cooling rate, the strong internal stress and the average grain size are important reasons for hindering the magnetization performance under the low magnetic field, and the magnetic domain only has translation under the low magnetic field strength and does not relate to the rotation of the magnetic domain, and the small internal stress enables the magnetic domain to more easily translate to obtain the high magnetization performance; meanwhile, the extension of the heat preservation time is beneficial to the homogenization of crystal grains and the improvement of the magnetization capability.
Drawings
FIG. 1 is a graph showing the comparison of low-field magnetization before and after the test;
FIG. 2 is a graph comparing grains at different heating rates;
FIG. 3 is a graph comparing grains at different cooling rates;
FIG. 4 is a graph comparing crystal grains at different holding times.
Detailed Description
The invention is further described with reference to specific embodiments and the accompanying drawings.
The non-oriented electrical steel under the low magnetic field comprises the following components in percentage by weight: c is less than or equal to 0.0020%, Si: 2.8-3.3%, Mn: 0.2-0.4%, P is less than or equal to 0.005%, Als: 0.2-0.9%, S is less than or equal to 0.001%, N is less than or equal to 0.0020%, Ti is less than or equal to 0.0015%, and the balance of iron and inevitable impurities, wherein: C. s, N and Ti satisfy the following formula: c% + S% + N% + Ti% < 0.0075%, the design principle of each element is as follows:
p: because P has obvious dislocation and segregation tendency, the growth of crystal grains can be hindered in different modes, and the evolution process of the steel plate texture can be influenced, and the magnetic induction B is influenced100So that the P element is controlled to 0.005% or less;
C. s, N, Ti, is a harmful element, when the content of C exceeds 0.003%, the magnetic aging can be generated to cause the iron loss deterioration in the using procedure of the silicon steel, and the magnetic steel has the advantages of improving the coercive force and the hysteresis loss and reducing the magnetic induction intensity; when the S and N contents are high, a large amount of MnS and Cu are generated2S, AlN and other inclusions influence the performance of silicon steel, and the important targets of the processes of heating, hot rolling and normalizing the casting blank are to control the precipitation of fine MnS particles and coarsen the existing MnS; when the content of Ti is increased, a large amount of fine and stable Ti (CN) inclusions can be formed to hinder the growth of crystal grains, increase the {111} crystal grains in a finished product and reduce the {100} crystal grains; the weight percentages of C, S, N and Ti therefore satisfy the following formula: c% + S% + N% + Ti% < 0.0075%;
si, Al: the content of Si and Al is increased, and the crystal grains of the finished product are coarsened, so that the quantity of domain walls is reduced, the eddy current loss is reduced, and the iron loss of the finished product is reduced; because the magnetic domain only has translation under lower magnetic field intensity and does not relate to magnetic domain rotation, the increase of Si can improve the magnetic induction of a low magnetic field and reduce the magnetic induction of a high magnetic field, and meanwhile, when the content of aluminum is 0.01-0.04%, Al and N are transformed into fine ALN to block the growth of crystal grains; therefore, Si is controlled to be 2.8-3.3%, and Als is controlled to be 0.2-0.9%;
mn: the influence of Mn on the magnetic steel is small, the influence is generally controlled to be 0.2-0.4%, the content of Mn is preferably controlled to be less than 0.15% in the invention, and when the content of Mn is more than 0.15%, the magnetic induction is reduced along with the increase of the content of Mn.
The invention improves the source of the components, strictly controls the content of harmful elements, reduces the generation of inclusions, increases {111} crystal grains in finished steel, reduces {100} crystal grains, and ensures that the finished steel has higher magnetization performance under lower magnetic field, and each element in the components is a conventional element and has lower cost.
A method for producing a non-oriented electrical steel under a low magnetic field according to the above, comprising the steps of:
preparing a plate blank: the steel with the chemical components obtained by smelting the conventional non-oriented silicon steel is subjected to molten iron pretreatment, converter steelmaking and vacuum treatment and then is continuously cast into a plate blank with the thickness of 200-300 mm;
heating the plate blank: the plate blank is cooled and then enters a heating furnace for heating, and the cooled plate blank is not lower than 500 ℃; preferably, the heating temperature of the heating furnace is 1100-1200 ℃, AlN and MnS are easily dissolved if the temperature reaches over 1200 ℃, precipitates are generated during later cooling to influence the magnetic property, the heating and heat preservation time is more than or equal to 210min, and the center of a casting blank is ensured to reach the target temperature;
hot rolling and coiling: the slab after heating and heat preservation is subjected to hot rolling and coiling, specifically, the final rolling temperature of the hot rolling is generally lower than Ar in the hot rolling process3The phase transformation point is 800-880 ℃, the finish rolling temperature is 830-850 ℃, and a hot rolled plate with the thickness of 2.0-2.3 mm is manufactured; after air cooling and water cooling processes, the temperature of the hot rolled plate is reduced to 600-680 ℃ for coiling, and lower coiling temperature is selected because normalization is carried out at the later stage; the cooling rate of the hot rolled plate can be increased by adopting the air cooling and water cooling mixed process;
normalized acid washing: the coiled hot rolled plate is subjected to normalized pickling, the normalization temperature is 850-950 ℃, the fibrous tissue of the hot rolled plate is ensured to grow up fully, the heat preservation time is 2-6 min, the pickling is performed by hydrochloric acid, the hydrochloric acid source is wide, the pickling effect is good, and the cost is low;
cold rolling: and (3) carrying out cold rolling on a reversible rolling mill after acid washing, wherein the cold rolling is 5-6 times of rolling, the total rolling reduction rate of the cold rolling is 75-85%, the temperature is controlled at 70-150 ℃, and the cold rolling is mainly used for preventing edge cracking, improving texture and improving magnetic property.
The annealing comprises the following steps: s1, heating the cold-rolled plate blank to a target temperature at a heating rate of more than or equal to 20 ℃/S, and then carrying out heat preservation; s2, keeping the temperature for 40-100S, and cooling at a cooling speed of less than or equal to 10 ℃/S; and the two steps are both finished in an annealing furnace, the dew point in the annealing furnace is controlled to be between 40 ℃ below zero and 10 ℃ below zero, and the temperature of the atmosphere P is controlled to be higher than the melting point of the annealing furnaceH2O/PH2The lower dew point is mainly used for controlling the water vapor content in the annealing atmosphere, and the lower water vapor content is beneficial to reducing the surface oxidation of the steel coil;
coating an insulating material: and coating the annealed steel with an insulating coating through a coating roller, and curing the insulating coating.
The production method improves the heating rate in the annealing heating process, shortens the heating time of the steel in the annealing furnace, and improves the heat preservation time of the steel in the furnace because the furnace length is constant; in the prior art, two-stage heating is generally adopted for the annealing process in the production of non-oriented electrical steel, the first stage is heated from room temperature to 800 ℃ for a short time, then the temperature is raised to a target temperature, the heat is preserved for a period of time and is cooled by air cooling and water cooling, the heating rate is generally controlled to be about 10 ℃/s, the cooling rate is generally greater than 20 ℃/s, the dew point in a furnace is controlled to be-40 to-10 ℃, the invention adopts a one-stage rapid heating mode, the heating stage is heated to the target temperature of 920 to 1000 ℃ by more than or equal to 20 ℃/s, the heating rate is improved, the rapid growth of crystal grains is facilitated, meanwhile, the rapid heating weakens unfavorable gamma texture, strengthens alpha texture, and further improves the magnetic performance of finished products; the surplus time after the first period of temperature rise can prolong the heat preservation time of the steel in the heating section, which is beneficial to the homogenization of crystal grains and the improvement of the magnetization capacity; at the same time H2And N2Acting as a protective atmosphere in a ratio of 3: 7; then the sample is air-cooled to below 560 ℃ at a cooling speed of less than or equal to 10 ℃/s, and the internal stress in the sample plate can be reduced by reducing the cooling speed, and the internal stress is strongerThe force and the average grain size are important reasons for preventing the magnetization performance under low magnetic field, and the magnetic domain only has translation under the low magnetic field strength and does not relate to the rotation of the magnetic domain, so that the magnetic domain can more easily translate by smaller internal stress to obtain higher magnetization performance.
The non-oriented silicon steel annealing process is mainly used for eliminating strain generated by cold rolling and promoting grain growth, and the production method of the invention influences the three aspects of low magnetic field magnetization performance by adjusting on the basis of the original high-grade chemical components: beneficial to texture components, grain uniformity and stress reduction, adjusts the heating rate and cooling rate of the annealing process and prolongs the heat preservation time, and leads the magnetic induction B to be similar to the original high-grade components1000.3T is increased to reach the iron loss P1.5/50Less than or equal to 2.40W/kg, and magnetic induction B100≥1.2T，B5000Not less than 1.67T; the non-oriented steel produced by the method has stronger magnetization performance under a lower magnetic field, and the whole production method is simple and convenient to operate and high in safety performance.
Example 1
In the implementation, the non-oriented electrical steel under the low magnetic field comprises the following components in percentage by weight: c: 0.0019%, Si: 2.9%, Mn: 0.25%, P: 0.003%, Als: 0.85%, S: 0.001%, N: 0.0007%, Ti: 0.0015%, the balance of iron and inevitable impurities; the production method of the non-oriented electrical steel under the low magnetic field comprises the following steps:
preparing a plate blank: adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements; continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220 mm;
heating the plate blank: cooling the continuously cast plate blank, and then feeding the plate blank into a heating furnace, wherein the temperature of the heating furnace is 1180 ℃, and the time is 210 min;
hot rolling and coiling: the heated plate blank is roughly rolled to 34mm in 3 times, finely rolled to 2.0mm in thickness in 7 times, cooled to 620 ℃ after air cooling and water cooling processes, and coiled;
normalized acid washing: the coiled hot rolled plate is subjected to normalized pickling, wherein the normalized temperature of the hot rolled plate is 920 ℃, the speed is 25m/min, the heat preservation time is 2-6 min, and the hot rolled plate is pickled by hydrochloric acid with the mass concentration of 58% and the pickling temperature is 80 ℃;
cold rolling: after acid washing, cold rolling the mixture on a reversible rolling mill for 5 times until the target thickness is 0.35mm, and controlling the total reduction rate of the cold rolling to be 82%;
annealing: heating the cold-rolled plate blank in an annealing furnace at a heating rate of 10 ℃/s until the temperature is heated to a target temperature of 980 ℃, then preserving the heat, cooling at a cooling rate of 10 ℃/s after preserving the heat, and H2And N2Annealing is carried out by taking the steel plate blank as a protective atmosphere according to the volume ratio of 3:7, the speed of the steel plate blank in an annealing furnace is 100m/min, and the total time of the annealing furnace is 120 s;
coating an insulating material: coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
The cold-rolled non-oriented electrical steel strip manufactured by the method has excellent surface quality and P of finished products1.5/50Less than or equal to 2.26W/kg, and magnetic induction B100≥0.878T，B5000And the value is more than or equal to 1.667T, as shown in the left figure in FIG. 2.
Comparative example 1
Comparative example 1 as example 1, in which the components of non-oriented steel were the same as example 1, comparative example 2 was produced as follows:
preparing a plate blank: adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements; continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220 mm;
heating the plate blank: cooling the continuously cast plate blank, and then feeding the plate blank into a heating furnace, wherein the temperature of the heating furnace is 1180 ℃, and the time is 210 min;
hot rolling and coiling: the heated plate blank is roughly rolled to 34mm in 3 times, finely rolled to 2.0mm in thickness in 7 times, cooled to 620 ℃ after air cooling and water cooling processes, and coiled;
normalized acid washing: the coiled hot rolled plate is subjected to normalized pickling, wherein the normalized temperature of the hot rolled plate is 920 ℃, the speed is 25m/min, the heat preservation time is 2-6 min, and the hot rolled plate is pickled by hydrochloric acid with the mass concentration of 58% and the pickling temperature is 80 ℃;
cold rolling: after acid washing, cold rolling the mixture on a reversible rolling mill for 5 times until the target thickness is 0.35mm, and controlling the total reduction rate of the cold rolling to be 82%;
annealing: heating the cold-rolled plate blank in an annealing furnace at a heating rate of 20 ℃/s until the temperature is heated to a target temperature of 980 ℃, then preserving the heat, cooling at a cooling rate of 10 ℃/s after preserving the heat, and H2And N2Annealing is carried out by taking the steel plate blank as a protective atmosphere according to the volume ratio of 3:7, the speed of the steel plate blank in an annealing furnace is 100m/min, and the time of the annealing furnace is 120 s;
coating an insulating material: coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
The cold-rolled non-oriented electrical steel strip manufactured by the method has excellent surface quality and P of finished products1.5/50Less than or equal to 2.20W/kg, and magnetic induction B100≥0.923T，B5000Not less than 1.667T. The faster ramp rate favors the grain orientation in the favorable 100 directions, as shown in the right hand graph of fig. 2.
Comparative example 2
Comparative example 2 as example 1, in which the components of the non-oriented steel were the same as example 1, the production method of comparative example 2 was as follows:
preparing a plate blank: adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements; continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220 mm;
heating the plate blank: cooling the continuously cast plate blank, and then feeding the plate blank into a heating furnace, wherein the temperature of the heating furnace is 1180 ℃, and the time is 210 min;
hot rolling and coiling: the heated plate blank is roughly rolled to 34mm in 3 times, finely rolled to 2.0mm in thickness in 7 times, cooled to 620 ℃ after air cooling and water cooling processes, and coiled;
normalized acid washing: the coiled hot rolled plate is subjected to normalized pickling, wherein the normalized temperature of the hot rolled plate is 920 ℃, the speed is 25m/min, the heat preservation time is 2-6 min, and the hot rolled plate is pickled by hydrochloric acid with the mass concentration of 58% and the pickling temperature is 80 ℃;
cold rolling: after acid washing, cold rolling the mixture on a reversible rolling mill for 5 times until the target thickness is 0.35mm, and controlling the total reduction rate of the cold rolling to be 82%;
annealing: heating the cold-rolled plate blank in an annealing furnace at a heating rate of 10 ℃/s until the temperature is heated to a target temperature of 980 ℃, then preserving the heat, cooling at a cooling rate of 5 ℃/s after preserving the heat, and H2And N2Annealing is carried out by taking the steel plate blank as a protective atmosphere according to the volume ratio of 3:7, the speed of the steel plate blank in an annealing furnace is 100m/min, and the time of the annealing furnace is 120 s;
coating an insulating material: coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
The cold-rolled non-oriented electrical steel strip manufactured by the method has excellent surface quality and P of finished products1.5/50Less than or equal to 2.21W/kg, magnetic induction B100≥0.931T，B5000Not less than 1.667T. Reducing the cooling rate is beneficial to reducing the internal stress, and is beneficial to the translation of the magnetic domain under a lower magnetic field, so as to obtain stronger low-magnetic-field magnetization performance, and the contrast condition of the crystal grains is shown in the right drawing in figure 3.
Comparative example 3
Comparative example 3 as example 1, in which the components of the non-oriented steel were the same as example 1, comparative example 3 was produced as follows:
preparing a plate blank: adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements; continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220 mm;
heating the plate blank: cooling the continuously cast plate blank, and then feeding the plate blank into a heating furnace, wherein the temperature of the heating furnace is 1180 ℃, and the time is 210 min;
hot rolling and coiling: the heated plate blank is roughly rolled to 34mm in 3 times, finely rolled to 2.0mm in thickness in 7 times, cooled to 620 ℃ after air cooling and water cooling processes, and coiled;
normalized acid washing: the coiled hot rolled plate is subjected to normalized pickling, wherein the normalized temperature of the hot rolled plate is 920 ℃, the speed is 25m/min, the heat preservation time is 2-6 min, and the hot rolled plate is pickled by hydrochloric acid with the mass concentration of 58% and the pickling temperature is 80 ℃;
cold rolling: after acid washing, cold rolling the mixture on a reversible rolling mill for 5 times until the target thickness is 0.35mm, and controlling the total reduction rate of the cold rolling to be 82%;
annealing: heating the cold-rolled plate blank in an annealing furnace at a heating rate of 10 ℃/s until the temperature is heated to a target temperature of 980 ℃, then preserving the heat, cooling at a cooling rate of 10 ℃/s after preserving the heat, and H2And N2Annealing is carried out by taking the steel plate blank as a protective atmosphere according to the volume ratio of 3:7, the speed of the steel plate blank in an annealing furnace is 80m/min, and the time of the annealing furnace is 240 s;
coating an insulating material: coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
The cold-rolled non-oriented electrical steel strip manufactured by the method has excellent surface quality and P of finished products1.5/50Less than or equal to 2.38W/kg, and magnetic induction B100≥0.976T，B5000Not less than 1.673T. The lower annealing rate gives the sample a longer soak time, resulting in better grain uniformity to higher magnetization capability, the grain contrast is shown in the right hand graph of fig. 4.
Comparative example 4
Comparative example 4 as example 1, in which the components of the non-oriented steel were the same as example 1, comparative example 4 was produced as follows:
preparing a plate blank: adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements; continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220 mm;
heating the plate blank: cooling the continuously cast plate blank, and then feeding the plate blank into a heating furnace, wherein the temperature of the heating furnace is 1180 ℃, and the time is 210 min;
hot rolling and coiling: the heated plate blank is roughly rolled to 34mm in 3 times, finely rolled to 2.0mm in thickness in 7 times, cooled to 620 ℃ after air cooling and water cooling processes, and coiled;
normalized acid washing: the coiled hot rolled plate is subjected to normalized pickling, wherein the normalized temperature of the hot rolled plate is 920 ℃, the speed is 25m/min, the heat preservation time is 2-6 min, and the hot rolled plate is pickled by hydrochloric acid with the mass concentration of 58% and the pickling temperature is 80 ℃;
cold rolling: after acid washing, cold rolling the mixture on a reversible rolling mill for 5 times until the target thickness is 0.35mm, and controlling the total reduction rate of the cold rolling to be 82%;
annealing: cold rolled sheetHeating the blank in an annealing furnace at a heating rate of 20 ℃/s until the blank is heated to a target temperature of 980 ℃, then preserving heat, cooling at a cooling rate of 5 ℃/s after preserving heat, and H2And N2Annealing is carried out by taking the steel plate blank as a protective atmosphere according to the volume ratio of 3:7, the speed of the steel plate blank in an annealing furnace is 80m/min, and the time of the annealing furnace is 240 s;
coating an insulating material: coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
The cold-rolled non-oriented electrical steel strip manufactured by the method has excellent surface quality and P of finished products1.5/50Less than or equal to 2.32W/kg, and magnetic induction B100≥1.21T，B5000Not less than 1.676T. The test is carried out on the premise of optimizing the temperature rise rate, the cooling rate and the heat preservation time to obtain better texture structure and lower cooling stress, and then obtain higher B100As shown in fig. 1.
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 (2)

1. A non-oriented electrical steel under a low magnetic field is characterized in that: comprises the following components in percentage by weight: c is less than or equal to 0.0020%, Si: 2.8-3.3%, Mn: 0.2-0.4%, P is less than or equal to 0.005%, Als: 0.2-0.9%, S is less than or equal to 0.001%, N is less than or equal to 0.0020%, Ti is less than or equal to 0.0015%, and the balance of iron and inevitable impurities, wherein: C. s, N and Ti satisfy the following formula: c% + S% + N% + Ti% < 0.0075%;
the preparation method sequentially comprises the following steps:
firstly, preparing a plate blank and heating the plate blank
The heating temperature in the slab heating is 1100-1200 ℃, and the heating and heat preservation time is more than or equal to 210 min;
second, hot rolling and coiling
The final rolling temperature of hot rolling in hot rolling coiling is 830-850 ℃, and the slab is cooled to 600-680 ℃ after being hot rolled into a hot rolled plate for coiling;
third, normalizing acid cleaning
In the normalizing pickling, the normalizing temperature is 850-950 ℃, the heat preservation time is 2-6 min, and hydrochloric acid pickling is adopted for pickling;
fourthly, cold rolling
The cold rolling is 5-6 times of rolling, and the total rolling reduction rate of the cold rolling is 75-85%;
fifthly, annealing and insulating material coating
S1, heating the cold-rolled plate blank to a target temperature at a heating rate of more than or equal to 20 ℃/S, and then carrying out heat preservation;
s2, after preserving heat for 40-100S, cooling at a cooling speed of less than or equal to 10 ℃/S;
wherein the annealing is finished in an annealing furnace, and the dew point in the annealing furnace is controlled to be-40 to-10 ℃.
2. The non-oriented electrical steel at low magnetic field according to claim 1, wherein: comprises the following components in percentage by weight: c: 0.0019%, Si: 2.9%, Mn: 0.25%, P: 0.003%, Als: 0.85%, S: 0.001%, N: 0.0007%, Ti: 0.0015%, and the balance of iron and inevitable impurities.
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