CN114606435A - High-efficiency high-strength non-oriented silicon steel thin strip for automobile driving motor - Google Patents
High-efficiency high-strength non-oriented silicon steel thin strip for automobile driving motor Download PDFInfo
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- CN114606435A CN114606435A CN202210120682.4A CN202210120682A CN114606435A CN 114606435 A CN114606435 A CN 114606435A CN 202210120682 A CN202210120682 A CN 202210120682A CN 114606435 A CN114606435 A CN 114606435A
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- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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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- 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
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- 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
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- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
Abstract
The invention relates to the field of non-oriented silicon steel production. The high-efficiency high-strength non-oriented silicon steel thin strip for the automobile driving motor comprises the following chemical components in percentage by weight: the content of C is 0.001-0.003 wt%; the content of S is less than or equal to 0.001 wt%; the Si content is 3.0-3.6 wt%; the Al content is 0.6-1.2 wt%; the Mn content is 0.1-1.0 wt%; 0.02-0.12 wt% of Sb, 0.15-0.45 wt% of Cr, less than or equal to 0.03wt% of P, and the balance Fe and inevitable impurities. On the premise of high Si and Al alloy components, the non-oriented silicon steel texture is improved through secondary cold rolling, and the problems that the existing high-strength non-oriented silicon steel thin strip is high in preparation process difficulty and difficult to give consideration to both magnetic performance and mechanical performance are solved.
Description
Technical Field
The invention relates to the field of non-oriented silicon steel production.
Background
The automobile industry is one of the main fields of global greenhouse gas emission, and with the continuous improvement of the automobile reserves in China, how to reduce the carbon emission in the automobile industry is a very important part in realizing the targets of carbon peak reaching and carbon neutralization. China has comprehensively established the targets of carbon peak reaching 2030 and carbon neutralization 2060. Under the background, the reduction of carbon emission in the traffic field mainly depends on the electromotion of automobiles, and new energy automobiles will meet wide growth space.
With the rapid development of economy and society, the performance requirements on new energy automobiles are higher and higher. The energy of the automobile motor depends mainly on a vehicle-mounted battery, and the stored energy is limited, so that the motor is required to be as small, light and efficient as possible. The vehicle requires a strong power when starting, and therefore requires a strong torque from the electric machine. The motor can be achieved only by extremely high rotating speed when the automobile runs at high speed and saves energy, so the motor has higher high-low speed comprehensive efficiency. The high rotational speed of automotive motors results in large centrifugal forces experienced by the rotors, while the stator and rotor clearances need to be closely matched. In summary, silicon steel for motors is required to have high magnetic induction, low iron loss, high strength, and other properties. In addition, generally, a stator of a driving motor is required to have good magnetic properties, and a rotor is required to have mechanical properties with high strength. And the requirement of precise processing for separately producing the rotor can greatly increase the production cost of the iron core. From the viewpoint of cost reduction, it is appropriate to stamp the stator and rotor cores with the same kind of silicon steel plates, and it is necessary to develop non-oriented silicon steel plates having both magnetic and mechanical properties. Therefore, in order to meet the development requirements of the new energy automobile industry, the development of the high-efficiency high-strength non-oriented silicon steel thin strip with low iron loss, high magnetic induction and high strength is imperative.
The patent technology of 'a preparation method of a cerium-containing high-strength non-oriented silicon steel strip' (CN110129671A) prepares the non-oriented silicon steel strip with low medium-frequency iron loss, high magnetic induction and strength of 600 MPa by adding trace rare earth element Ce and controlling the temperature and time of recrystallization annealing. The method has shorter process flow, but the production cost is higher due to the addition of rare earth elements; in the aspect of performance, although the magnetic induction and the strength of the obtained material are high, the medium-frequency iron loss is general, the recrystallization annealing temperature period is long, the production efficiency is low, and the realization of industrial continuous production is not facilitated.
The patent technology of the non-oriented silicon steel for the driving motor of the electric automobile and the preparation method thereof (CN105950960B) regulates recrystallization by controlling the reasonable proportion of Si, Al and Mn and controlling the soaking time and the soaking temperature of incomplete recrystallization annealing to obtain a semi-process non-oriented silicon steel strip with the yield strength of 500MPa, which is used for manufacturing a rotor, and simultaneously used for manufacturing a motor stator and the rotor after the semi-process non-oriented silicon steel strip is subjected to stress relief annealing. The method has the advantages that the component system is simple, other alloy elements are not added, the strength of the obtained rotor is high, the magnetic performance of the stator is good, the non-oriented silicon steel for the stator is subjected to additional stress relief annealing, and the process is complex. Further, in the non-oriented silicon steel for a rotor, incomplete recrystallization annealing is used to obtain high strength, and although the magnetic properties of the non-oriented silicon steel strip for a rotor are not disclosed in the patent art, it is presumed that the magnetic properties are not good because of incomplete recrystallization.
"Excellent magnetic non-oriented silicon steel and production method for electric automobile driving motor" (CN107587039A) patent technology, through smelting casting, continuous casting billet heating, rough rolling, finish rolling, coiling, normalizing pickling, once cold rolling and production technology such as annealing; the non-oriented silicon steel strip excellent in magnetic properties is obtained by controlling the total number and total amount of precipitates and reducing the residual stress at the time of annealing, but the mechanical properties thereof are not disclosed.
The patent technology of 'a manufacturing method of high-strength non-oriented silicon steel for a new energy automobile driving motor' (CN106435358B) and the 'method for preparing the high-magnetic induction high-strength non-oriented silicon steel based on strip continuous casting', the high-strength non-oriented silicon steel is prepared by the strip continuous casting technology, the components of the high-strength non-oriented silicon steel are added with non-conventional elements such as Ni, Cr, Nb, Sn and the like, the component system is complex, and the requirements on smelting and various working procedures are higher; the obtained medium frequency iron loss P1.0/400 is higher.
The patent technology of 'high-strength cold-rolled non-oriented silicon steel for driving motors and a manufacturing method thereof' (CN107746941A) is characterized in that by adding trace elements such as Cr, Nb and the like and controlling the secondary cold-rolling reduction and the secondary annealing process, although the magnetic induction intensity, the iron loss and the yield strength of the prepared non-oriented silicon steel are balanced, the method mainly realizes dislocation rearrangement at high temperature in short time, namely dislocation strengthening is utilized; meanwhile, a part of deformation structure is reserved by utilizing the pinning effect of Nb, namely, crystal grains in the sample are not completely grown after annealing. Therefore, the dielectric loss performance is not good, and P1.0/400 is 18.8-32.12W/kg.
The patent technology of 'the high-strength copper-containing cold-rolled non-oriented silicon steel and the manufacturing method thereof' (CN107130169A) obtains the high-strength copper-containing non-oriented silicon steel by adding trace elements such as Cu and controlling the secondary cold-rolling reduction and two annealing processes, although the strength is higher to reach 800Mpa grade, the magnetic induction strength and the medium-frequency iron loss are general, B5000 is 1.64-1.66T, W1.0/400 is 20.04-25.04W/kg, and compared with the conventional non-oriented silicon steel production flow, the method has the advantages of one more aging treatment process, long production period and complex process flow.
Patent CN102453838A discloses a high-strength non-oriented electrical steel with high magnetic induction and a manufacturing method thereof, which improves the mechanical property of non-oriented silicon steel by adding 1-8% of Cr and 0.5-5% of Ni into a matrix to make a large amount of alloy elements dissolved in the matrix, and simultaneously improves the production cost of the high-strength non-oriented silicon steel.
The patent technology of 'a high-strength non-oriented silicon steel strip and a preparation method thereof' (CN110004381A) prepares the non-oriented silicon steel strip with low medium-frequency iron loss, high magnetic induction and strength of 600-700 MPa by adding Cu and Cr elements and controlling the temperature and time of recrystallization annealing. The method has the advantages of short process flow and relatively low cost, but the recrystallization annealing temperature period is long, the production efficiency is low, and the method is not beneficial to realizing industrial continuous production.
Disclosure of Invention
The invention aims to solve the technical bottleneck that the magnetic induction and the iron loss of high-grade non-oriented silicon steel are mutually restricted, and provides the preparation method of the high-strength non-oriented silicon steel strip with relatively simple preparation process, low production cost and excellent comprehensive performance.
The technical scheme adopted by the invention is as follows: the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following chemical components in percentage by weight: the content of C is 0.001-0.003 wt%; the content of S is less than or equal to 0.001 wt%; the Si content is 3.0-3.6 wt%; the Al content is 0.6-1.2 wt%; the Mn content is 0.1-1.0 wt%; 0.02-0.12 wt% of Sb, 0.15-0.45 wt% of Cr, less than or equal to 0.03wt% of P, and the balance Fe and inevitable impurities, wherein the silicon steel strip has a medium-frequency iron loss P1.0/400 of 7-14W/kg, a magnetic induction B5000 of 1.67-1.71T, a yield strength Rp0.2 of 450-520 MPa, an Rm of 550-650MPa, and an elongation of 14.5-15.6%.
The manufacturing method of the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following steps
Smelting: respectively weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1100-1200 ℃ for 1-3h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 850-900 ℃, and then coiling the hot rolled plate at 650-700 ℃ to obtain a hot rolled plate with the thickness of 1.5-2.0 mm;
normalizing: controlling a soaking section of the hot rolled plate prepared in the hot rolling step to keep the temperature of the hot rolled plate at 900-950 ℃ for 1-3 min, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: carrying out primary cold rolling on the normalizing plate prepared in the normalizing step to a thickness of 0.5-1.0 mm, and then carrying out H treatment on the normalizing plate with a volume ratio of 25%2Keeping the temperature of the atmosphere (composed of nitrogen and hydrogen) at 850-900 ℃ for 2-5min, and cooling to obtain a primary annealing plate;
secondary cold rolling and annealing: carrying out secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, wherein the reduction is less than or equal to 75%, the secondary cold rolling is carried out until the thickness of the secondary annealed plate is 0.2-0.4 mm, and then the secondary annealed plate is subjected to H treatment in a volume ratio of 40%2Keeping the temperature of the dry atmosphere (composed of nitrogen and hydrogen) at 950-1050 ℃ for 3-5min, coating the coating, and cooling to room temperature.
The invention designs a high-efficiency high-strength non-oriented silicon steel ribbon for an automobile driving motor and a brand-new manufacturing method, designs a novel smelting component of silicon steel for the automobile driving motor, which has higher main alloy elements such as Si and Al, lower steel purity elements such as C, S and the like, and simultaneously adds trace elements such as Sb and Cr; and the silicon steel product for the automobile driving motor, which has excellent comprehensive properties such as medium-frequency iron loss, magnetic induction and strength and can be produced in batches, is obtained by a secondary cold rolling method for reasonably distributing the parameters of the primary cold rolling reduction, the normalizing process with reasonable design and the secondary annealing process.
The strength of the non-oriented silicon steel strip is improved by utilizing the solid solution strengthening effect of the high Si and Al alloy components; the fine dispersion second phase is prevented from being cooled and separated out by controlling C, S and other ways of influencing steel purity elements during smelting; the resistivity is improved by adding a proper amount of Mn, trace Cr and other components during smelting, the iron loss is reduced, and the grain boundary segregation of Sb during recrystallization is prevented by adding trace elements such as Sb and the like, so that the formation of unfavorable texture (111) components is prevented, and the magnetic induction is improved; the comprehensive favorable texture proportion is improved by adopting a secondary cold rolling method and designing a reasonable primary cold rolling reduction rate; by reasonably matching normalizing and twice annealing temperature parameters to reduce iron loss and improve magnetic induction and comprehensively utilizing the multiple control means, the high-efficiency high-strength non-oriented silicon steel strip with excellent medium-frequency iron loss, magnetic induction and strength comprehensive performance can be prepared.
The invention relates to a combination of smelting components, a twice cold rolling process, normalization and twice annealing processes designed for developing high-efficiency high-strength silicon steel for automobile driving motors, which is a brand new technical attempt.
According to the invention, by adding trace Cr and Sb, the resistivity can be improved, the medium-frequency iron loss can be reduced, the nucleation of unfavorable texture (111) is hindered by grain boundary segregation during primary annealing and secondary recrystallization annealing, the preferential growth of Goss texture is promoted, and the magnetic induction is favorably improved.
On the premise of high Si and Al alloy components, the texture of the non-oriented silicon steel is improved by secondary cold rolling, and the problems that the preparation process of the conventional high-strength non-oriented silicon steel ribbon is difficult to realize and the magnetic performance and the mechanical performance are difficult to consider are solved. Effectively considers the strength, the rollability and the magnetic performance of the high-strength non-oriented silicon steel strip.
Detailed Description
Example 1
The manufacturing method of the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following steps
Smelting: weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
the chemical components of the material by weight percentage are as follows: 0.001-0.003 wt% of C, less than or equal to 0.001wt% of S and 3.25 wt% of Si; al is 1.2 wt%; mn is 0.70 wt%; 0.02wt% of Sb, 0.45wt% of Cr and less than or equal to 0.03wt% of P; the balance of Fe and inevitable impurities.
Casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1150 ℃ for 2h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 860 ℃, and then coiling the hot rolled plate at 650-700 ℃ to obtain a hot rolled plate with the thickness of 1.8 mm;
normalizing: keeping the temperature of the hot rolled plate prepared in the hot rolling step for 2min at 940 ℃, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: cold rolling the normalized plate obtained in the normalizing step to 0.80mm in thickness, and then adding H with the volume ratio of 25 percent2Keeping the temperature at 850-900 ℃ in atmosphere for 3Cooling after min to obtain a primary annealing plate;
secondary cold rolling and annealing: carrying out secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, wherein the reduction is less than or equal to 75%, the secondary cold rolling is carried out until the thickness of the plate is 0.30mm, and then the plate is subjected to H treatment in a volume ratio of 40%2The above dry atmosphere (45% H by volume)2+55％N2) And keeping the temperature at 990 ℃ for 3-5min, coating the coating, and cooling to room temperature.
Magnetic property B of the obtained product50001.71T, iron loss P1.0/40013.2W/kg, mechanical properties: rp0.2452MPa, Rm 575MPa, elongation 15.55%.
Example 2
The manufacturing method of the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following steps
Smelting: weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
the chemical components of the material by weight percentage are as follows: 0.001-0.003 wt% of C, less than or equal to 0.001wt% of S and 3.4 wt% of Si; al is 1.0 wt%; mn is 0.55 wt%; 0.02wt% of Sb, 0.3wt% of Cr and less than or equal to 0.03wt% of P; the balance of Fe and inevitable impurities.
Casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1150 ℃ for 2h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 860 ℃, and then coiling the hot rolled plate at 650-700 ℃ to obtain a hot rolled plate with the thickness of 1.8 mm;
normalizing: keeping the temperature of the hot rolled plate prepared in the hot rolling step for 2min at 940 ℃, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: cold rolling the normalizing plate obtained in the normalizing step to 0.80mm thick, and then performing H with the volume ratio of 25 percent2Keeping the temperature for 3min under the condition of atmosphere and 850 ℃, and then cooling to obtain a primary annealing plate;
secondary cold rolling and annealing: performing secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, and pressing downThe amount is less than or equal to 75 percent, the steel is secondarily cold-rolled to the thickness of 0.30mm, and then the volume ratio of H to H is 40 percent2The above dry atmosphere (45% H by volume)2+55％N2) And keeping the temperature at 970 ℃ for 3-5min, coating a coating, and cooling to room temperature.
Magnetic property B of the obtained product50001.69T, iron loss P1.0/400The mechanical property is as follows: rp0.2487MPa, Rm 601MPa, and elongation 15.6%.
Example 3
The manufacturing method of the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following steps
Smelting: weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
the chemical components of the material by weight percentage are as follows: 0.001-0.003 wt% of C, less than or equal to 0.001wt% of S and 3.45 wt% of Si; 0.9 wt% of Al; mn is 0.45 wt%; 0.05wt% of Sb, 0.2wt% of Cr and less than or equal to 0.03wt% of P; the balance of Fe and inevitable impurities.
Casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1150 ℃ for 2h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 860 ℃, and then coiling the hot rolled plate at 680 ℃ to obtain a hot rolled plate with the thickness of 1.8 mm;
normalizing: keeping the temperature of the hot rolled plate prepared in the hot rolling step for 2min at 940 ℃, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: cold rolling the normalizing plate obtained in the normalizing step to 0.60mm thick, and then performing H with the volume ratio of 25 percent2Keeping the temperature for 3min under the condition of atmosphere and 850 ℃, and then cooling to obtain a primary annealing plate;
secondary cold rolling and annealing: carrying out secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, wherein the reduction is less than or equal to 75%, the secondary cold rolling is carried out until the thickness of the plate is 0.30mm, and then the plate is subjected to H treatment in a volume ratio of 40%2The above dry atmosphere (45% H by volume)2+55％N2) Keeping the temperature for 3-5min at 970 DEG CCoating the coating and cooling to room temperature.
Magnetic property B of the obtained product50001.69T, iron loss W1.0/40010.1W/kg, and the mechanical properties are as follows: rp0.2493MPa, Rm 609MPa and 14.7 percent of elongation.
Example 4
The manufacturing method of the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following steps
Smelting: weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
the chemical components of the material by weight percentage are as follows: 0.001-0.003 wt% of C, less than or equal to 0.001wt% of S and 3.5 wt% of Si; 0.8 wt% of Al; mn is 0.25 wt%; 0.06wt% of Sb, 0.2wt% of Cr and less than or equal to 0.03wt% of P; the balance of Fe and inevitable impurities.
Casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1150 ℃ for 2h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 860 ℃, and then coiling the hot rolled plate at 680 ℃ to obtain a hot rolled plate with the thickness of 2.0 mm;
normalizing: keeping the temperature of the hot rolled plate prepared in the hot rolling step for 2min under the condition of controlling a soaking section at 940 ℃, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: cold rolling the normalizing plate obtained in the normalizing step to 0.90mm thick, and then performing H with the volume ratio of 25 percent2Keeping the temperature for 3min under the condition of atmosphere and 850 ℃, and then cooling to obtain a primary annealing plate;
secondary cold rolling and annealing: carrying out secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, wherein the reduction is less than or equal to 75%, the secondary cold rolling is carried out until the thickness of the plate is 0.40mm, and then the plate is subjected to H treatment in a volume ratio of 40%2The above dry atmosphere (45% H by volume)2+55％N2) And keeping the temperature at 960 ℃ for 3-5min, coating a coating, and cooling to room temperature.
Magnetic property B of the obtained product50001.68T, iron loss W1.0/4009.3W/kg, and the mechanical properties are as follows: rp0.2500MPa, Rm 620MPa, and 15.3% elongation.
Example 5
The manufacturing method of the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor comprises the following steps
Smelting: weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
the chemical components of the material by weight percentage are as follows: 0.001-0.003 wt% of C, less than or equal to 0.001wt% of S and 3.6wt% of Si; 0.6 wt% of Al; mn is 0.15 wt%; 0.12wt% of Sb, 0.15wt% of Cr and less than or equal to 0.03wt% of P; the balance of Fe and inevitable impurities.
Casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1150 ℃ for 2h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 860 ℃, and then coiling the hot rolled plate at 680 ℃ to obtain a hot rolled plate with the thickness of 2.0 mm;
normalizing: keeping the temperature of the hot rolled plate prepared in the hot rolling step for 2min at 940 ℃, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: cold rolling the normalizing plate obtained in the normalizing step to 0.90mm thick, and then performing H with the volume ratio of 25 percent2Keeping the temperature for 3min under the condition of atmosphere and 850 ℃, and then cooling to obtain a primary annealing plate;
secondary cold rolling and annealing: carrying out secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, wherein the reduction is less than or equal to 75%, the secondary cold rolling is carried out until the thickness of the plate is 0.40mm, and then the plate is subjected to H treatment in a volume ratio of 40%2The above dry atmosphere (45% H by volume)2+55％N2) And keeping the temperature at 960 ℃ for 3-5min, coating a coating, and cooling to room temperature.
Magnetic property B of the obtained product50001.67T, iron loss W1.0/400The mechanical property is as follows: rp0.2515MPa, Rm 633MPa, elongation 15.0%.
The present invention has been described in connection with the above embodiments, but the present invention is not limited to the above embodiments, but is limited only by the appended claims, and those skilled in the art can easily modify and change them without departing from the true spirit and scope of the present invention.
Claims (2)
1. The high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor is characterized in that: the chemical components of the material by weight percentage are as follows: the content of C is 0.001-0.003 wt%; the content of S is less than or equal to 0.001 wt%; the Si content is 3.0-3.6 wt%; the Al content is 0.6-1.2 wt%; the Mn content is 0.1-1.0 wt%; 0.02-0.12 wt% of Sb, 0.15-0.45 wt% of Cr, less than or equal to 0.03wt% of P, and the balance Fe and inevitable impurities, wherein the silicon steel strip has a medium-frequency iron loss P1.0/400 of 7-14W/kg, a magnetic induction B5000 of 1.67-1.71T, and a yield strength Rp0.2450 to 520MPa, Rm is 550-650MPa, and the elongation is 14.5-15.6%.
2. The method for manufacturing the high-efficiency high-strength non-oriented silicon steel strip for the automobile driving motor as claimed in claim 1, wherein the method comprises the following steps: comprises the following steps
Smelting: weighing raw materials according to chemical component percentage, and smelting in a converter to obtain molten steel;
casting: continuously casting the molten steel obtained in the smelting step to obtain a cast ingot with the thickness of 35 mm-40 mm;
hot rolling: keeping the temperature of the cast ingot obtained in the casting step at 1100-1200 ℃ for 1-3h, then carrying out seven-pass rolling by a rolling mill, controlling the final rolling temperature at 850-900 ℃, and then coiling the hot rolled plate at 650-700 ℃ to obtain a hot rolled plate with the thickness of 1.5-2.0 mm;
normalizing: controlling a soaking section of the hot rolled plate prepared in the hot rolling step to keep the temperature of the hot rolled plate at 900-950 ℃ for 1-3 min, and then cooling the hot rolled plate after shot blasting and pickling to obtain a normalized plate;
primary cold rolling and annealing: carrying out primary cold rolling on the normalizing plate prepared in the normalizing step to a thickness of 0.5-1.0 mm, and then carrying out H treatment on the normalizing plate with a volume ratio of 25%2Preserving heat for 2-5min under the condition of atmosphere and 850-900 ℃, and then cooling to obtain a primary annealing plate;
secondary cold rolling and annealing: carrying out secondary cold rolling on the primary annealed plate prepared by the primary cold rolling and annealing steps, and pressingThe amount is less than or equal to 75 percent, the steel is secondarily cold-rolled to the thickness of 0.2 mm-0.4 mm, and then the steel is subjected to H with the volume ratio of 40 percent2Keeping the temperature in the dry atmosphere at 950-1050 ℃ for 3-5min, coating a coating, and cooling to room temperature.
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