CN118048574B - Non-oriented silicon steel and production method thereof - Google Patents
Non-oriented silicon steel and production method thereof Download PDFInfo
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 74
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 30
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- 238000013461 design Methods 0.000 description 9
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- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses non-oriented silicon steel and a production method thereof, wherein in molten steel obtained by smelting, C is less than or equal to 0.0025%, si is 1.80-1.95%, mn is 0.27-0.50%, al is 0.30-0.50%, S is less than or equal to 0.003%, ce is 0.0045-0.0065%, and the balance is Fe and impurities; the proportion of the equiaxed crystals in the continuous casting billet is more than or equal to 50 percent, and the average width of the columnar crystals is less than or equal to 3.5mm; during hot rolling, the finish rolling inlet temperature is 910-950 ℃, the finish rolling temperature is 830-870 ℃, and the coiling temperature is 700-740 ℃; the total rolling reduction of the cold continuous rolling is 85.5-86.2%, the rolling reduction of the fifth pass is 18-20%, and the rolling outlet speed is more than or equal to 800m/min; the annealing temperature is 960-990 ℃, and the plate passing speed is 150-165 m/min; and (5) coating and finishing after annealing.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a production method of non-oriented silicon steel, and non-oriented silicon steel prepared by the production method.
Background
The non-oriented silicon steel is a low-C ferrosilicon soft magnetic alloy and is widely applied to the fields of household appliances, power systems, communication systems, military industry and the like.
Because of the high Si content and the high austenite-ferrite transformation temperature in the non-oriented silicon steel, finish rolling is generally performed in a low-temperature ferrite region during production, and the deformed ferrite structure after rolling cannot be recrystallized, so that a deformed fiber structure is obtained. In order to recrystallize the deformed fibrous structure, a normalizing treatment is required to be added before cold rolling, so that the production difficulty is increased, and the equipment investment is increased. In addition, the content of Si and Al in the non-oriented silicon steel is higher, so that the steel plate after hot rolling is obviously hardened, and the non-oriented silicon steel with the thin specification of about 0.35mm is difficult to produce by adopting a cold continuous rolling mill. The non-oriented silicon steel is rolled by a single-frame six-roller reversible rolling mill or a single-frame twenty-roller reversible rolling mill in the current steel field to prepare thin-specification strip steel, so that the production efficiency is low, the waste cutting amount of the tail of the strip steel is greatly increased, and the production cost of the single-frame reversible rolling mill is 40-50% higher than that of a cold continuous rolling mill.
Disclosure of Invention
The invention aims to provide a production method of non-oriented silicon steel and the non-oriented silicon steel prepared by the production method, so as to solve the technical problems that the non-oriented silicon steel with excellent performance can be prepared by normalizing the non-oriented silicon steel in the prior art, and cold continuous rolling cannot be performed, so that the production cost is high.
In order to achieve one of the above objects, an embodiment of the present invention provides a method for producing an unoriented silicon steel, comprising the following steps sequentially performed,
Smelting: the chemical components of the molten steel finally obtained by smelting comprise the following components in percentage by mass: less than or equal to 0.0025 percent of C, 1.80 to 1.95 percent of Si, 0.27 to 0.50 percent of Mn, 0.30 to 0.50 percent of Al, less than or equal to 0.003 percent of S, 0.0045 to 0.0065 percent of rare earth Ce, and the balance of Fe and unavoidable impurities;
Continuous casting: continuously casting the obtained molten steel into a continuous casting blank, wherein the proportion of equiaxed crystals in the continuous casting blank is more than or equal to 50%, and the average width of columnar crystals is less than or equal to 3.5mm;
And (3) hot rolling: heating the continuous casting blank, performing rough rolling to obtain an intermediate blank, and performing finish rolling and coiling in sequence to obtain a hot rolled coil; the inlet temperature of finish rolling is 910-950 ℃, the finishing temperature is 830-870 ℃, and the coiling temperature is 700-740 ℃;
Cold continuous rolling: after naturally cooling the hot rolled coiled sheet, adopting a five-frame cold continuous rolling mill to perform five-pass continuous rolling to obtain a non-oriented silicon steel strip, controlling the total rolling reduction to be 85.5-86.2%, controlling the rolling reduction of the fifth pass to be 18-20%, and controlling the rolling outlet speed to be more than or equal to 800m/min;
annealing: feeding the unoriented silicon steel strip into a continuous annealing furnace for annealing treatment, wherein the annealing temperature is 960-990 ℃, and the strip passing speed is 150-165 m/min;
Coating and finishing: and cooling the annealed unoriented silicon steel strip, and then coating and finishing.
As a further improvement of an embodiment of the invention, the purity of the rare earth Ce is more than or equal to 99.99 percent.
As a further improvement of an embodiment of the invention, in the continuous casting process, the equiaxed crystal proportion of the continuous casting billet is more than or equal to 55 percent.
As a further improvement of an embodiment of the present invention, in the hot rolling step, the soaking temperature is 1100-1140 ℃, the soaking time is 180-200 min, and the coiling temperature is 720-740 ℃.
As a further improvement of the embodiment of the present invention, in the hot rolling step, the thickness of the intermediate slab is 40mm, and the thickness of the hot rolled coil is 2.5mm; in the cold continuous rolling process, the thickness of the unoriented silicon steel strip is 0.35+/-0.005 mm.
As a further improvement of an embodiment of the present invention, in the cold continuous rolling process, the rolling reduction of the first pass is controlled to be 32-34%, and the rolling reduction of the fifth pass is controlled to be 18-19%.
As a further improvement of an embodiment of the invention, in the cold continuous rolling process, the concentration of the emulsion adopted by the five-frame cold continuous rolling mill is controlled to be 2.5-2.8%, and the temperature of the emulsion is 60+/-3 ℃.
As a further improvement of the embodiment of the present invention, in the annealing step, the protective atmosphere in the continuous annealing furnace is a full H 2 atmosphere or a mixed atmosphere of H 2 and N 2.
In order to achieve the above object, an embodiment of the present invention further provides a non-oriented silicon steel, which is manufactured by the above-mentioned manufacturing method.
As a further improvement of an embodiment of the invention, the iron loss P 1.5/50 of the non-oriented silicon steel is less than or equal to 2.8W/kg, the magnetic induction intensity B 50 is more than or equal to 1.69T, the tensile strength is 400-450 MPa, and the elongation after break is more than or equal to 20%.
Compared with the prior art, the invention has the beneficial effects that:
(1) Based on the chemical composition design scheme, not only can the resistivity of the non-oriented silicon steel be improved, the eddy current loss is reduced, the magnetic performance is improved, but also the appearance and the size of inclusions in steel can be changed, the number of the inclusions is reduced, the plasticity and the toughness of the non-oriented silicon steel are improved, the non-oriented silicon steel has excellent machinability, and a foundation is laid for the subsequent realization of cold continuous rolling, so that the production difficulty can be reduced, the production efficiency and the yield are improved, and the production cost is reduced.
(2) Based on the design scheme of the chemical components, the mutual influence of the chemical elements and the content thereof is combined, and the mutual influence of the elements and the content and the production procedures, especially the optimization of hot rolling and cold continuous rolling procedures is combined, so that the non-oriented silicon steel can be subjected to cold continuous rolling by adopting a five-frame cold continuous rolling machine under the condition of canceling the normalizing procedure.
(3) The non-oriented silicon steel prepared by the production method has the iron loss P 1.5/50 of less than or equal to 2.8W/kg, the magnetic induction intensity B 50 of more than or equal to 1.69T, the tensile strength of 400-450 MPa, the elongation after fracture of more than or equal to 20%, and the magnetic induction performance is excellent, has low iron loss and high magnetic induction, is qualified in electromagnetic performance when being applied to products such as motors and the like, and can meet the application energy efficiency requirements of the products such as motors and the like.
Detailed Description
The present invention will be described in detail with reference to specific embodiments. These embodiments are not intended to limit the invention and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the invention.
The invention provides a production method of non-oriented silicon steel and non-oriented silicon steel prepared by the production method.
In this embodiment, the chemical composition design scheme of the non-oriented silicon steel is as follows, and the chemical composition of the non-oriented silicon steel comprises the following components in percentage by mass: less than or equal to 0.0025 percent of C, 1.80 to 1.95 percent of Si, 0.27 to 0.50 percent of Mn, 0.30 to 0.50 percent of Al, less than or equal to 0.003 percent of S, 0.0045 to 0.0065 percent of rare earth Ce, and the balance of Fe and unavoidable impurities.
In the design scheme of the chemical components, the functions of the chemical components are as follows:
C. S: in the non-oriented silicon steel, harmful elements are generally prevented from growing up and moving in magnetic domains by means of tiny precipitation or grain boundary segregation, so that the tissue state of the material is influenced, and the influence on the mechanical property and magnetic property of the non-oriented silicon steel is very strong, so that the content of C is less than or equal to 0.0025% and the content of S is less than or equal to 0.003% in the invention.
Si: the resistivity can be increased after the alpha-iron is dissolved in a solid way, the separation of harmful impurity carbon is facilitated, and Si and O are combined to be converted into stable SiO 2, so that lattice distortion of iron is avoided, and therefore, after the Si is added, the magnetic permeability can be improved, the coercive force can be reduced, and the iron loss can be reduced.
Mn: the low content of Mn can improve the strength, hardness and wear resistance of steel and improve the low-temperature toughness of steel, but excessive Mn is easy to form MnS compound with S in the solidification process, and is pinned at a grain boundary to be unfavorable for growth of crystal grains, and the Mn content is controlled to be 0.27-0.50%.
Al: the Al is easy to combine with N to form dispersed AlN precipitate particles, and is kept in solid solution, so that the resistivity can be improved, the crystal grains can be coarsened, the magnetic property of the silicon steel can be improved, and the mechanical property of the steel is influenced.
Based on the design scheme of the chemical components, under the synergistic effect of the chemical components and the content, the non-oriented silicon steel has excellent magnetic property and mechanical property, and 0.0045-0.0065% of rare earth Ce is further added, so that on one hand, the rare earth Ce is easy to generate a rare earth compound with small density and high melting point with harmful elements such as O, S in the smelting process of molten steel, and is further discharged from the molten steel, the inclusion content is reduced, the cleanliness of the molten steel is improved, the rare earth compound remained in the molten steel can be used as a core of heterogeneous nucleation and be pinned at a grain boundary in the subsequent process, the movement of the grain boundary is blocked, the grain growth is inhibited, the grain refinement is further obviously inhibited, the development of columnar crystals in a continuous casting blank is further obviously inhibited, the proportion of equiaxed crystals is further increased, on the other hand, the appearance and the size of the inclusion are improved, the unfavorable texture {111} is also reduced, the favorable textures {110} and {100} are increased, the magnetic property is improved, and the control of the content of the rare earth can also be avoided.
In the whole, through the design scheme of the chemical components, not only can the resistivity of the non-oriented silicon steel be improved, the eddy current loss be reduced, the magnetic performance be improved, but also the appearance and the size of inclusions in steel can be changed, the number of the inclusions can be reduced, the plastic toughness of the non-oriented silicon steel can be improved, the non-oriented silicon steel has excellent machinability, and a foundation is laid for the subsequent realization of cold continuous rolling, so that the production difficulty can be reduced, the production efficiency and the yield can be improved, and the production cost can be reduced.
The production method of the unoriented silicon steel is specifically described below and comprises the procedures of smelting, continuous casting, hot rolling, cold continuous rolling, annealing, coating, finishing and the like which are sequentially carried out.
(1) Smelting
The chemical components of the molten steel finally obtained by smelting comprise the following components in percentage by mass: less than or equal to 0.0025 percent of C, 1.80 to 1.95 percent of Si, 0.27 to 0.50 percent of Mn, 0.30 to 0.50 percent of Al, less than or equal to 0.003 percent of S, 0.0045 to 0.0065 percent of rare earth Ce, and the balance of Fe and unavoidable impurities.
That is, the smelting process is performed to smelt molten steel according to the chemical composition design scheme of the non-oriented silicon steel, so that the chemical composition of molten steel finally obtained by smelting is approximately the same as that of the non-oriented silicon steel finally prepared.
Preferably, the purity of the rare earth Ce is more than or equal to 99.99 percent, so as to avoid the influence of excessive impurity elements on the effect of the rare earth Ce.
Specifically, the smelting process comprises molten iron desulfurization, primary smelting in a furnace and vacuum refining which are sequentially carried out, and the specific operation of the molten iron desulfurization, primary smelting in the furnace and vacuum refining process can be realized by adopting the existing corresponding technology without repeated description.
(2) Continuous casting
Continuously casting molten steel obtained by smelting into a continuous casting blank, wherein the proportion of equiaxed crystals in the continuous casting blank is more than or equal to 50%, and the average width of columnar crystals is less than or equal to 3.5mm. The rare earth Ce can obviously inhibit the development of columnar crystals in the continuous casting process, refine and break up the columnar crystals to increase the equiaxed crystal proportion, so that the columnar crystal proportion in a continuous casting billet can reach at least half, and inhibit developed columnar crystal structures in the continuous casting billet, thereby avoiding serious internal cracks and center segregation caused by the developed columnar crystal structures and coarse strip structures of a hot rolled plate, and avoiding the influence on the quality of a final finished product caused by no recrystallization of the strip structures in the subsequent cold rolling and annealing processes, and avoiding the defect of the final finished product strip steel.
Furthermore, the equiaxed crystal proportion of the continuous casting blank can be more than or equal to 55 percent.
Specifically, molten steel obtained by smelting is prepared into a continuous casting blank with the thickness of 200-250 mm by adopting continuous casting equipment, and the chemical components of the obtained continuous casting blank are completely the same as those of the finally prepared non-oriented silicon steel.
(3) Hot rolling
And heating the continuous casting blank obtained in the continuous casting process, performing rough rolling to obtain an intermediate blank, and performing finish rolling and coiling in sequence to obtain a hot rolled coil. The inlet temperature of finish rolling is controlled to be 910-950 ℃, the finishing temperature is controlled to be 830-870 ℃, and the coiling temperature is controlled to be 700-740 ℃. By controlling the finishing temperature in this range and coiling at a high temperature, the hot rolled structure can be further increased, and the problems that the recovery effect is poor due to the excessively low coiling temperature and the temperature uniformity is difficult to ensure due to the excessively high coiling temperature can be avoided.
Preferably, the soaking temperature during heating is controlled to be 1100-1140 ℃, the soaking time is controlled to be 180-200 min, the coiling temperature is controlled to be 720-740 ℃, precipitates in the continuous casting billet can be restrained from re-solutionizing by adopting a lower soaking temperature to heat the continuous casting billet, so that the precipitates are prevented from being miniaturized during hot rolling, and further, the uniformity of the temperature can be ensured by controlling the coiling temperature, and the hot rolling structure is further increased.
Preferably, the thickness of the intermediate billet is 40mm, the thickness of the hot rolled coil is 2.5mm, and the thickness of the intermediate billet and the hot rolled coil is controlled by hot rolling, so that the thin non-oriented silicon steel strip with the thickness of about 0.35mm can be prepared finally.
Therefore, on the basis of the design scheme of the chemical components, the hot rolling process adopts higher final rolling temperature and high-temperature coiling, and the hot rolling grains can be coarsened by combining the control of the heating temperature and the heating time of the continuous casting billet, and the waste heat after coiling can be utilized to replace the normalizing process through the high-temperature coiling, so that the purposes of simplifying the process flow, improving the production efficiency and reducing the production cost are achieved.
(4) Cold continuous rolling
And naturally cooling the hot rolled coiled sheet to room temperature, and adopting a five-frame cold continuous rolling mill to perform five-pass continuous rolling to obtain the unoriented silicon steel strip with the thickness of 0.35+/-0.005 mm. The rolling efficiency is improved by nearly 4 times, the head and tail cutting waste amount of the reciprocating rolling is reduced, the yield and the production efficiency are greatly improved, and the production cost is greatly reduced.
Preferably, the reduction rate of the first pass is controlled to be 32-34%, and the reduction rate of the fifth pass is controlled to be 18-19%. Wherein the first pass corresponds to a first stand of the five-stand cold tandem mill and the second to fifth passes correspond to a second to fifth stand of the five-stand cold tandem mill, respectively. The rolling force of the first frame is controlled to be properly larger by adopting large deformation reduction of the first frame, so that grains can be fully crushed in the first pass, and the plate shape quality and thickness precision of a finished product can be ensured by adopting small reduction of the fifth pass, and the advantage of the cold continuous rolling mill can be fully exerted by adopting a reduction distribution mode.
Preferably, the concentration of the emulsion adopted by the five-stand cold continuous rolling mill is controlled to be 2.5-2.8%, the temperature of the emulsion is 60+/-3 ℃, and the process lubrication can be effectively improved, the deformation heat is reduced, and the rolling stability of the five-stand cold continuous rolling mill is improved by acting the emulsion with high concentration and high temperature on the rollers of the five-stand cold continuous rolling mill.
Preferably, the five-stand cold continuous rolling mill employs a UCM five-stand cold continuous rolling mill.
(5) Annealing
And (3) feeding the unoriented silicon steel strip into a continuous annealing furnace for annealing treatment, wherein the annealing temperature is 960-990 ℃, and the strip passing speed is 150-165 m/min.
Preferably, the protective atmosphere in the continuous annealing furnace is a full H 2 atmosphere or a mixed atmosphere of H 2 and N 2, so that the formation of an inner oxide layer and an inner nitride layer of the steel strip can be prevented, the surface quality is improved, and the iron loss can be further reduced.
(6) Coating and finishing
And cooling the annealed unoriented silicon steel strip, and then coating and finishing.
Specifically, insulating layers are uniformly coated on the upper surface and the lower surface of the non-oriented silicon steel belt to improve the insulating property of the non-oriented silicon steel belt, and then finishing is carried out.
The specific operations of coating and finishing can be realized by adopting the existing feasible coating and finishing technology, and are not repeated here.
On the basis of the design scheme of the chemical components, the mutual influence of the chemical elements and the content thereof is combined, and the mutual influence of the elements and the content and the production procedures, especially the optimization of the hot rolling and cold continuous rolling procedures is combined, so that the non-oriented silicon steel can be subjected to cold continuous rolling by adopting a five-frame cold continuous rolling machine under the condition of canceling the normalizing procedure.
The invention also provides non-oriented silicon steel, which is prepared by the production method, wherein the thickness of a steel strip of the non-oriented silicon steel is 0.35+/-0.005 mm, and the non-oriented silicon steel comprises the following chemical components in percentage by mass: less than or equal to 0.0025 percent of C, 1.80 to 1.95 percent of Si, 0.27 to 0.50 percent of Mn, 0.30 to 0.50 percent of Al, less than or equal to 0.003 percent of S, 0.0045 to 0.0065 percent of rare earth Ce, and the balance of Fe and unavoidable impurities.
Through detection, the non-oriented silicon steel prepared by the production method has the iron loss P 1.5/50 of less than or equal to 2.8W/kg, the magnetic induction intensity B 50 of more than or equal to 1.69T, the tensile strength of 400-450 MPa, the elongation after break of more than or equal to 20%, and the magnetic induction performance is excellent, has low iron loss and high magnetic induction, is qualified in electromagnetic performance when being applied to products such as motors and the like, and can meet the application energy efficiency requirements of the products such as motors and the like.
The above detailed description is merely illustrative of possible embodiments of the present invention, which should not be construed as limiting the scope of the invention, and all equivalent embodiments or modifications that do not depart from the spirit of the invention are intended to be included in the scope of the invention.
The beneficial effects of the present invention are further illustrated by the following 2 examples and 3 comparative examples, of course, these 2 examples are only some of the many variations of the present invention, but not all.
Examples 1-2 and comparative examples 1-3 respectively provide non-oriented silicon steel and a production method thereof, chemical compositions of molten steel obtained by smelting, continuous casting billets and finally prepared non-oriented silicon steel in each example or each comparative example are consistent, and chemical compositions of examples 1-2 and comparative examples 1-3 are specifically shown in table 1. In addition, the balance of Fe and unavoidable impurities except for the chemical elements shown in Table 1.
TABLE 1
The production method is specifically as follows.
(1) Smelting
The chemical composition of the finally obtained molten steel is shown in table 1. Wherein the purity of the rare earth Ce is more than or equal to 99.99 percent.
(2) Continuous casting
And preparing molten steel obtained by smelting into a continuous casting blank with the thickness of 200-250 mm by adopting continuous casting equipment, wherein the chemical composition of the continuous casting blank is shown in a table 1, and the proportion of equiaxed crystals in the continuous casting blank and the average width of columnar crystals are shown in a table 2.
TABLE 2
(3) Hot rolling
And heating the continuous casting blank obtained in the continuous casting process, performing rough rolling to obtain an intermediate blank with the thickness of 40mm, and performing finish rolling and coiling in sequence to obtain a hot rolled coil with the thickness of 2.5 mm. Soaking temperature, soaking time, inlet temperature of finish rolling, finishing temperature, and coiling temperature at the time of heating are shown in Table 3.
TABLE 3 Table 3
(4) Cold continuous rolling
And naturally cooling the hot rolled coiled sheet to room temperature, and adopting a UCM five-rack cold continuous rolling mill to perform five-pass continuous rolling to obtain the unoriented silicon steel strip with the thickness of 0.35+/-0.005 mm. The concentrations of the emulsion and the temperatures of the emulsion used by the five-stand cold continuous rolling mill, and the reduction ratio of the first pass, the reduction ratio of the fifth pass and the total reduction ratio are shown in a reference table 4.
TABLE 4 Table 4
(5) Annealing
And (3) sending the unoriented silicon steel strip into a continuous annealing furnace for annealing treatment, wherein the protective atmosphere in the continuous annealing furnace is the full H 2 atmosphere or the mixed atmosphere of H 2 and N 2, and the annealing temperature and the strip passing speed are shown in a table 5. Among them, comparative example 3 was broken during cold continuous rolling, and thus annealing, coating and finishing processes and performance test were not performed.
TABLE 5
(6) Coating and finishing
And cooling the annealed unoriented silicon steel strip, and then coating and finishing to obtain an unoriented silicon steel strip finished product.
Mechanical property detection and magnetic induction performance detection are carried out on the unoriented silicon steel strip finished products of the examples 1-2 and the comparative examples 1-2, and the method specifically comprises the following steps:
< mechanical Property aspect >
The mechanical properties of the finished unoriented silicon steel strip were tested with reference to the GB/T228.1-2021 standard. Specifically, the tensile strength and the elongation after break of the finished unoriented silicon steel strip were tested by a tensile tester, and the test results are shown in table 6.
< Magnetic induction Property aspect >
The magnetic induction performance of the finished unoriented silicon steel strip was tested with reference to the GB/T3655-2022 standard, and the data of the core loss P 1.5/50 and the magnetic induction B 50 are shown in Table 6.
TABLE 6
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above detailed description is merely illustrative of possible embodiments of the present invention, which should not be construed as limiting the scope of the invention, and all equivalent embodiments or modifications that do not depart from the spirit of the invention are intended to be included in the scope of the invention.
Claims (10)
1. A production method of non-oriented silicon steel is characterized by comprising the following procedures sequentially carried out,
Smelting: the chemical components of the molten steel finally obtained by smelting comprise the following components in percentage by mass: less than or equal to 0.0025 percent of C, 1.80 to 1.95 percent of Si, 0.27 to 0.50 percent of Mn, 0.30 to 0.50 percent of Al, less than or equal to 0.003 percent of S, 0.0045 to 0.0065 percent of rare earth Ce, and the balance of Fe and unavoidable impurities;
Continuous casting: continuously casting the obtained molten steel into a continuous casting blank, wherein the proportion of equiaxed crystals in the continuous casting blank is more than or equal to 50%, and the average width of columnar crystals is less than or equal to 3.5mm;
And (3) hot rolling: heating the continuous casting blank, performing rough rolling to obtain an intermediate blank, and performing finish rolling and coiling in sequence to obtain a hot rolled coil; the inlet temperature of finish rolling is 910-950 ℃, the finishing temperature is 830-870 ℃, and the coiling temperature is 700-740 ℃;
Cold continuous rolling: after naturally cooling the hot rolled coiled sheet, adopting a five-frame cold continuous rolling mill to perform five-pass continuous rolling to obtain a non-oriented silicon steel strip, controlling the total rolling reduction to be 85.5-86.2%, controlling the rolling reduction of the fifth pass to be 18-20%, and controlling the rolling outlet speed to be more than or equal to 800m/min;
annealing: feeding the unoriented silicon steel strip into a continuous annealing furnace for annealing treatment, wherein the annealing temperature is 960-990 ℃, and the strip passing speed is 150-165 m/min;
Coating and finishing: and cooling the annealed unoriented silicon steel strip, and then coating and finishing.
2. The method for producing non-oriented silicon steel according to claim 1, wherein the purity of the rare earth Ce is not less than 99.99%.
3. The method for producing non-oriented silicon steel according to claim 1, wherein in the continuous casting process, the equiaxed crystal proportion of the continuous casting billet is not less than 55%.
4. The method according to claim 1, wherein in the hot rolling step, the soaking temperature is 1100 to 1140 ℃, the soaking time is 180 to 200min, and the coiling temperature is 720 to 740 ℃.
5. The method of producing non-oriented silicon steel according to claim 1, wherein in the hot rolling step, the thickness of the intermediate slab is 40mm, and the thickness of the hot rolled coil is 2.5mm; in the cold continuous rolling process, the thickness of the unoriented silicon steel strip is 0.35+/-0.005 mm.
6. The method for producing non-oriented silicon steel according to claim 1, wherein in the cold continuous rolling process, the rolling reduction of the first pass is controlled to be 32-34%, and the rolling reduction of the fifth pass is controlled to be 18-19%.
7. The method for producing non-oriented silicon steel according to claim 1, wherein in the cold continuous rolling process, the concentration of the emulsion used by the five-frame cold continuous rolling mill is controlled to be 2.5-2.8%, and the temperature of the emulsion is controlled to be 60+/-3 ℃.
8. The method according to claim 1, wherein the protective atmosphere in the continuous annealing furnace in the annealing step is a full H 2 atmosphere or a mixed atmosphere of H 2 and N 2.
9. A non-oriented silicon steel characterized by being produced by the production method as set forth in any one of claims 1 to 8.
10. The non-oriented silicon steel according to claim 9, wherein the iron loss P 1.5/50 is less than or equal to 2.8W/kg, the magnetic induction intensity B 50 is more than or equal to 1.69T, the tensile strength is 400-450 MPa, and the elongation after break is more than or equal to 20%.
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