CN112159927A - Cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products thereof - Google Patents

Cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products thereof Download PDF

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CN112159927A
CN112159927A CN202010976898.1A CN202010976898A CN112159927A CN 112159927 A CN112159927 A CN 112159927A CN 202010976898 A CN202010976898 A CN 202010976898A CN 112159927 A CN112159927 A CN 112159927A
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silicon steel
oriented silicon
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祁旋
裴英豪
施立发
夏雪兰
占云高
刘青松
程国庆
徐文祥
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Maanshan Iron and Steel Co Ltd
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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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • 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
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium

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Abstract

The invention discloses cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products thereof, belonging to the technical field of non-oriented silicon steel. The invention relates to cold-rolled non-oriented silicon steel with different yield ratios, which comprises the following chemical components in percentage by weight: c is less than or equal to 0.005%, Si: 1.8% -2.1%, Mn: 0.2% -0.4%, Als: 0.3 to 0.5 percent of the total weight of the alloy, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities. The invention aims to overcome the defects in the prior art and provide non-oriented silicon steel with different yield ratios for a variable frequency compressor motor and a production method of two products of the non-oriented silicon steel.

Description

Cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products thereof
Technical Field
The invention belongs to the technical field of non-oriented silicon steel production, and particularly relates to cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products of the cold-rolled non-oriented silicon steel.
Background
Silicon steel is mainly used for producing various rotating motors, transformers, generators and the like, and non-oriented silicon steel is used as a raw material for producing various rotating motors and is an indispensable important soft magnetic alloy material in electric power, electronics, military industry and vehicles. Generally, the magnetic property and the mechanical property of non-oriented silicon steel are closely related to the content of alloy elements, the higher the silicon content is, the better the magnetic property is, but the higher the strength and the higher the hardness are, and the punching property is reduced. At present, users mostly adopt an automatic high-speed continuous punching machine for continuous punching, which puts higher requirements on punching performance of silicon steel materials. In the continuous punching process of the non-oriented silicon steel plate, the steel plate is too soft, so that obvious punching edge deformation or burrs are easily caused, the lamination coefficient of an iron core is reduced, and the steel plate is too hard, so that the punching die is obviously abraded, and therefore the non-oriented silicon steel plate has the mechanical property matched with the punching die in the punching consideration.
When the non-oriented electrical steel is used for producing the stator and the rotor of the motor of the variable frequency compressor, the non-oriented electrical steel with proper magnetic property and mechanical property is selected according to the requirement of the performance of the motor of the compressor and the characteristics of a punch die. If the mechanical properties are not matched, the production of the fixed rotor is not tightly riveted, even the risk of cracking and the like is caused, and the problems of low production yield, low efficiency and the like are caused. Users often select non-oriented silicon steel materials with proper magnetic properties according to the requirements of the motor performance, namely select non-oriented silicon steel products with proper marks, but simultaneously require the silicon steel materials to have mechanical properties matched with the die properties according to the die properties of the existing punch, so that silicon steel manufacturers are required to produce the non-oriented silicon steel products which adopt the same component system and have different yield ratios according to the different mechanical property requirements of the users on the non-oriented silicon steel.
For example, the Chinese patent application number is: 2010800598532, the name of invention creation is: a method for producing a non-oriented electrical steel excellent in workability, wherein a steel type composition comprising, in weight%, 0.7 to 3.0% of Al, 0.2 to 3.5% of Si, 0.2 to 2.0% of Mn, 0.001 to 0.004% of N, 0.0005 to 0.004% of S, and the balance of Fe and inevitable impurities is provided, and the non-oriented electrical steel excellent in workability and magnetic properties is obtained mainly by optimizing Al, Si, Mn, N and S, increasing the distribution density of coarse inclusions, and improving the growth characteristics of crystal grains and the mobility of a magnetic domain wall.
Also, for example, the Chinese patent application number is: 2019103794284, the name of invention creation is: a high-strength non-oriented silicon steel thin strip and a preparation method thereof are provided, the high-strength non-oriented silicon steel thin strip and the preparation method thereof are provided, the steel comprises the following components: 0.5 to 1.0% of Al, 3.0 to 3.5% of Si, 0.1 to 1.0% of Mn, 1.0 to 2.0% of Cu, and the balance of Fe and inevitable impurities. The invention improves the strength by improving the content of alloy elements, and has higher cost.
For another example, the Chinese patent application number is: 2017102635012, the name of invention creation is: a high-strength cold-rolled non-oriented silicon steel and a manufacturing method thereof are provided, and the strength is improved by adding Cu and Ni elements and controlling secondary cold-rolling reduction, annealing and aging processes. The method has the advantages of high Ni element price and high preparation cost.
In view of the prior art, the method for producing the non-oriented silicon steel only aims at the explanation of a production method of the non-oriented silicon steel with specific mechanical properties, and the mechanical properties of the non-oriented silicon steel are not graded. Under the condition of adopting the same component system, the invention realizes non-oriented silicon steel products with different yield ratios by optimizing the processes of continuous casting, hot rolling, normalizing, cold rolling, continuous annealing and the like, and the magnetic performance of the non-oriented silicon steel products meets the requirements of motors of variable frequency compressors and simultaneously meets the requirements of different users on different punching performances of silicon steel materials by punching dies.
Disclosure of Invention
1. Problems to be solved
The invention aims to overcome the defects in the prior art and provide cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products thereof, wherein the cold-rolled non-oriented silicon steel has excellent magnetic performance and different punching performances, and the two products with different yield ratios can meet the requirements of different punching performances of silicon steel materials of punch dies of different users while meeting the requirements of the magnetic performance of the non-oriented silicon steel for compressor motors.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The invention relates to cold-rolled non-oriented silicon steel with different yield ratios, which comprises the following chemical components in percentage by weight: c is less than or equal to 0.005%, Si: 1.8% -2.1%, Mn: 0.2% -0.4%, Als: 0.3 to 0.5 percent of the total weight of the alloy, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities.
Wherein the elements have the following functions in the steel:
c: the C element can improve the yield strength of the silicon steel material, but the tensile strength is increased greatly, the yield ratio of the product is reduced, but the C can deteriorate the magnetic performance of the silicon steel product, the C content is reduced as much as possible in the silicon steel production, and the C content is controlled to be below 0.005 percent in consideration of the requirement of the magnetic performance range of the invention.
Si: si element can improve resistivity rho to reduce iron loss, but simultaneously magnetic induction can also be reduced, in order to ensure the iron loss range of products, the Si content is controlled to be more than 1.8 percent, the Si element is beneficial to improving the yield ratio of the products, the brittleness and hardness of silicon steel finished products are also improved, cold rolling processability is poor, the Si content is not easy to be controlled to be too high and is controlled to be less than 2.1 percent, and the magnetic performance of the products and the requirements of the two yield ratio ranges are integrated, wherein the Si content is controlled to be 1.8 to 2.1 percent.
Mn: the Mn element can improve the magnetic performance of the product, but the Mn element mainly plays a role in improving the yield strength and the tensile strength of the product, the improvement range of the yield strength is relatively large, the Mn element can obviously improve the yield ratio of the product, and the Mn content is controlled to be more than 0.2%. And Mn element and S element form MnS, which can inhibit hot brittleness in the heating process, so that the S content is considered to be less than or equal to 0.005 percent, and the Mn content is controlled to be between 0.2 and 0.4 percent.
P: in silicon steel, P has a grain boundary segregation effect, can improve resistivity rho and reduce a gamma phase region, and is beneficial to improving the magnetic performance of a product, but the P is easy to generate an embrittlement phenomenon and seriously deteriorates the bending times of the product, so that the content of P is not easy to be too high and needs to be controlled below 0.04%.
And Als: al element is similar to Si element, the magnetic property of the product can be improved, the influence degree of the Al element on the brittleness of the electrical steel is smaller than that of the Si element, the magnetic property and the processing property of the product are integrated, and the ALs content is controlled to be 0.3-0.5 percent. .
S, N, Ti: s and N elements can increase the iron loss of the electrical steel and deteriorate the magnetic performance of products, and in order to meet the actual use requirement, the content of S and N needs to be controlled below 0.005 percent; TiC and TiN formed by Ti element and C can prevent the crystal grain from growing and deteriorate the magnetic property, so the Ti content in the steel should be controlled below 0.005%.
A production method of cold-rolled non-oriented silicon steel with a yield ratio of 0.6-0.62 comprises the steps of continuously casting molten steel of the components into a plate blank with the thickness of 200-260 mm, and then directly loading the plate blank into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1200-1300 ℃, and the heating and heat preservation time is not less than 210 min.
As a further improvement of the invention, the casting blank is subjected to 7-pass finish rolling to obtain a hot rolled plate with the thickness of 2.3-2.6 mm, the final rolling temperature is controlled to be 860-900 ℃, the coiling temperature is controlled to be 600-660 ℃, and the plate is naturally cooled to the normal temperature.
As a further improvement of the invention, the hot-rolled strip steel passes through a normalizing pickling line, the normalizing temperature is controlled between 900 ℃ and 960 ℃, and the normalizing time is 2min to 4 min; after normalizing, shot blasting is carried out to remove the iron scale on the surface of the strip steel, and then hydrochloric acid is adopted for acid cleaning, wherein the acid cleaning temperature is 75-90 ℃, so as to ensure that the surface of the strip steel is cleaned.
As a further improvement of the invention, the temperature of continuous annealing is controlled to be 920-960 ℃, the annealing time is controlled to be 240-480 s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7.
A production method of cold-rolled non-oriented silicon steel with a yield ratio of 0.67-0.69 comprises the steps of continuously casting molten steel of the components into a plate blank with the thickness of 200-260 mm, and then directly loading the plate blank into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the heating and heat preservation time is not less than 210 min.
As a further improvement of the invention, the casting blank is subjected to 7-pass finish rolling to obtain a hot rolled plate with the thickness of 2.0-2.3 mm, the final rolling temperature is controlled to be 820-860 ℃, the coiling temperature is controlled to be 550-610 ℃, and the plate is naturally cooled to the normal temperature.
As a further improvement of the invention, the hot-rolled strip steel passes through a normalizing pickling line, the normalizing temperature is controlled between 840 ℃ and 870 ℃, and the normalizing time is 2min to 3 min; after normalizing, shot blasting is carried out to remove the iron scale on the surface of the strip steel, and then hydrochloric acid is adopted for acid cleaning, wherein the acid cleaning temperature is 75-90 ℃, so as to ensure that the surface of the strip steel is cleaned.
As a further improvement of the invention, the temperature of continuous annealing is controlled to be 840-890 ℃, the annealing time is controlled to be 240-480 s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7.
As a further improvement of the invention, the annealed strip steel adopts a two-stage cooling methodThe first stage is a high temperature slow cooling stage with a cooling rate V1The control should be as follows: v is less than or equal to 3 ℃/s1Less than or equal to 5 ℃/s; the second stage is a controlled cooling stage with a cooling rate V2The control should be as follows: cooling speed V is less than or equal to 12 ℃/s2≤16℃/s。
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the cold-rolled non-oriented silicon steel with different yield ratios, Mn element can improve the magnetic performance of products, but the main effect of the cold-rolled non-oriented silicon steel is to improve the yield strength and the tensile strength of the products, the yield strength is relatively large in improvement range, Mn can obviously improve the yield ratio of the products, and the Mn content is controlled to be more than 0.2%. And Mn element and S element form MnS, which can inhibit hot brittleness in the heating process, so that the S content is considered to be less than or equal to 0.005 percent, and the Mn content is controlled to be between 0.2 and 0.4 percent.
(2) The invention relates to a production method of cold-rolled non-oriented silicon steel with a yield ratio of 0.6-0.62, which comprises the steps of continuously casting molten steel of the components into a plate blank with the thickness of 200-260 mm, and then directly loading the plate blank into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1200-1300 ℃, and the heating and heat preservation time is not less than 210 min. Because the higher the temperature of the heating furnace is, the better the magnetic performance of the product is, the high-temperature hot rolling can reduce the yield ratio of the product, and because of the requirement of low yield ratio in the invention, the temperature of the heating furnace is not easy to be too low, the temperature of the heating furnace is controlled to be more than 1200 ℃, but the surface defect of the hot rolled plate is increased due to too high temperature of the heating furnace, so that the iron scale of the product is not easy to fall off, and the temperature of the heating furnace is controlled to be between 1200 ℃ and 1300 ℃.
(3) According to the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62, the influence of the continuous annealing temperature on the magnetic property and the mechanical property of a product is large, the higher the annealing temperature is, the lower the iron loss is, but the lower the magnetic induction is, and meanwhile, the lower the yield ratio of the product is, the lower the requirement on the yield ratio of the product is considered, meanwhile, in order to improve the magnetic property of the product, the annealing temperature is controlled to be above 920 ℃, in order to ensure the magnetic induction of the product, the annealing temperature is controlled to be 920-960 ℃, and during annealing, the annealing is carried out240s to 480s, H2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7.
(4) The invention relates to a production method of cold-rolled non-oriented silicon steel with a yield ratio of 0.67-0.69, which comprises the steps of continuously casting molten steel of the components into a plate blank with the thickness of 200-260 mm, and then directly loading the plate blank into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the heating and heat preservation time is not less than 210 min. Because the yield strength of the product can be improved by low-temperature hot rolling, the tensile strength is not obviously improved, and the yield ratio of the product is obviously improved, the temperature of the heating furnace is not easy to be too high and is controlled within 1200 ℃, and therefore, the temperature of the heating furnace is controlled between 1050 ℃ and 1200 ℃.
(5) According to the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.67-0.69, the influence of the continuous annealing temperature on the magnetic property and the mechanical property of the product is large, the lower the annealing temperature is, the smaller the average grain size is, the higher the yield strength and the tensile strength are, but the larger the yield strength increase amplitude is, the higher the product yield ratio is, but the product iron loss is increased, the magnetic property and the yield ratio of the product are comprehensively considered, the annealing temperature is controlled to be 840-890 ℃, the annealing time is 240-480 s, and H is controlled to be H2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7.
(6) According to the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.67-0.69, the strip steel is subjected to two-stage cooling after annealing, the first stage is a high-temperature slow cooling stage, and the cooling speed V is1The control should be as follows: v is less than or equal to 3 ℃/s1The temperature is less than or equal to 5 ℃/s, the structure crystal grains can be refined by rapid cooling after the annealing of the strip steel, the yield strength of the product is improved, and the yield ratio is improved; the second section is a controlled cooling section with a cooling speed V2The cooling speed is controlled to be more than 12 ℃/s, but the residual stress of the strip steel is increased by rapid cooling, the magnetic property of the product is deteriorated, so the cooling speed is not easy to be overhigh, the magnetic property and the yield ratio of the product with comprehensive opening rate are integrated, and the cooling speed V of the cooling section is controlled in the second section2The control should be as follows: cooling speed V is less than or equal to 12 ℃/s2≤16℃/s。
Drawings
FIG. 1 is a microstructure (100 times) of a finished non-oriented electrical steel product with a yield ratio in the range of 0.6 to 0.62, prepared in examples 1 to 4 of the present invention;
FIG. 2 is a microstructure (100 times) of a finished non-oriented electrical steel product having a yield ratio in the range of 0.67 to 0.69, prepared in examples 5 to 8 of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The following description of the embodiments of the invention will provide further details of the embodiments of the invention
Example 1
The cold-rolled non-oriented silicon steel with different yield ratios of the embodiment comprises the following chemical components in percentage by weight: c: 0.005%, Si: 1.8%, Mn: 0.2%, Als: 0.3%, S: 0.004%, P: 0.03%, N: 0.005%, Ti: 0.004%, and the balance of Fe and inevitable impurities.
According to the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62, the molten steel with the components is continuously cast into a plate blank with the thickness of 200-260 mm, and then the plate blank is directly placed into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1200-1300 ℃, and the heating and heat preservation time is not less than 210 min. Because the higher the temperature of the heating furnace is, the better the magnetic performance of the product is, the high-temperature hot rolling can reduce the yield ratio of the product, and because of the requirement of low yield ratio in the invention, the temperature of the heating furnace is not easy to be too low, the temperature of the heating furnace is controlled to be more than 1200 ℃, but the surface defect of the hot rolled plate is increased due to too high temperature of the heating furnace, so that the iron scale of the product is not easy to fall off, and the temperature of the heating furnace is controlled to be between 1200 ℃ and 1300 ℃. Specifically, the thickness of the slab in this example is 200mm, the temperature of the heating furnace is 1200 ℃, and the heating and heat-preserving time is 210 min.
In the embodiment, the influence of the thickness of the hot rolled plate on the yield ratio of the finished product is obvious, the requirement of low yield ratio is considered, and in order to reduce the economic cost, the casting blank is subjected to hot rolling for 7 times and is subjected to finish rolling to obtain the hot rolled plate with the thickness of 2.3-2.6 mm. In order to improve the magnetic performance of the product, the higher the finish rolling temperature and the curling temperature are, the lower the product yield ratio is, the lower the yield ratio requirement is considered, the finish rolling temperature is controlled to be 860-900 ℃, the curling temperature is controlled to be 600-660 ℃, and the product is naturally cooled to the normal temperature. Specifically, the thickness of the hot rolled plate in this example was 2.3mm, the finish rolling temperature was 860 ℃ and the curling temperature was 600 ℃.
In the embodiment, the hot-rolled strip steel passes through a normalizing pickling line, the normalizing temperature has a large influence on the magnetic performance and the yield ratio of the finished product, the magnetic performance and the yield ratio of the product are integrated, the normalizing temperature is controlled between 900 ℃ and 960 ℃, and the normalizing time is 2min to 4 min; after normalizing, shot blasting is carried out to remove the iron scale on the surface of the strip steel, and then acid washing is carried out by 55 percent hydrochloric acid at the acid washing temperature of 75-90 ℃ to ensure that the surface of the strip steel is cleaned. Specifically, in this embodiment, the normalizing temperature is 900 ℃, the normalizing time is 2min, and the pickling temperature is 75 ℃.
In this embodiment, the normalized plate is subjected to 6 passes of rolling by a single cold rolling method, the total reduction rate of the cold rolling is 84-87%, and the target thickness of the finished product is 0.35 mm. Specifically, in this example, the total cold rolling reduction is 84%.
In this embodiment, the influence of the continuous annealing temperature on the magnetic property and the mechanical property of the product is large, the higher the annealing temperature is, the lower the iron loss is, but the lower the magnetic induction is, and meanwhile, the lower the product yield ratio is, considering that the requirement on the product yield ratio is low, meanwhile, in order to improve the magnetic property of the product, the annealing temperature should be controlled to be above 920 ℃, and in order to ensure the magnetic induction of the product, the annealing temperature should be controlled to be 920-960 ℃, the annealing time of 240-480 s, H2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. In consideration of the high annealing temperature in the scheme, the surface of the strip steel is subjected to alkali rinsing, alkali scrubbing and electrolytic cleaning to remove residual oil and residual iron on the surface before annealing, the phenomenon of furnace bottom roller nodulation caused by oil stain and residual iron on the surface of the strip steel is prevented, and the residual oil entering the front surface of the strip steel of the annealing furnace is less than or equal to 250mg/m2The total amount of iron powder is less than or equal to 100mg/m2. After annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 380-650 ℃. Specifically, in the embodiment, the annealing temperature is 920 ℃, and the annealing time is 480 s; the curing temperature was 380 ℃.
The finished product of the non-oriented electrical steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/502.81W/Kg, magnetic induction B50001.73T, yield strength 259MPa, yield ratio 0.617 and average grain size of product structure 40 μm. Wherein: iron loss P1.5/50The iron core loss is an alternating magnetic field with the frequency of 50Hz and the maximum magnetic flux density of 1.5T; magnetic induction B5000The magnetic flux density is under the condition that the magnetic field intensity is 5000A/m; yield strength is defined as A50And (5) standard detection. The non-oriented silicon steel product with excellent magnetic performance and different yield ratios, which is produced by the process of the invention, is used in the field of variable frequency compressor motors, so that the requirements of the variable frequency compressor motors on the magnetic performance of the non-oriented electrical steel are met, and the requirements of different users of the variable frequency compressor motors on the different punching performances of the silicon steel material by punching dies are met.
Example 2
In the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62, the chemical components in percentage by weight are as follows: c: 0.004%, Si: 2.1%, Mn: 0.4%, Als: 0.5%, S: 0.005%, P: 0.04%, N: 0.003%, Ti: 0.005% and the balance of Fe and inevitable impurities.
The production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62 is basically the same as that of the embodiment 1, and is different in that the molten steel with the chemical components is continuously cast into a slab with the thickness of 260mm, and then the slab is directly put into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1300 ℃, and the heating and heat preservation time is 220 min.
In this example, the casting blank was finish-rolled to a hot-rolled plate having a thickness of 2.6mm in 7 passes, the finish rolling temperature was 900 ℃, the coiling temperature was 660 ℃, and the plate was naturally cooled to normal temperature.
In the normalizing pickling process of the embodiment, the normalizing temperature is 960 ℃, the normalizing time is 4min, after normalization, shot blasting is performed to remove iron scales on the surface of the strip steel, and then hydrochloric acid is used for pickling, wherein the pickling temperature is 90 ℃, so that the surface of the strip steel is ensured to be cleaned.
In this example, the normalized sheet with the cleaned surface was subjected to 6 passes of rolling by a single cold rolling method, the total reduction rate of the cold rolling was 87%, and the target thickness of the cold-rolled product was 0.35 mm.
In the embodiment, the temperature of continuous annealing is controlled to 960 ℃, the annealing time is controlled to 240s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. And after annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 650 ℃.
The finished product of the non-oriented silicon steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/502.79W/Kg, magnetic induction B50001.75T, yield strength 240MPa, tensile strength-to-yield ratio 0.60 and average grain size of product structure 46 μm.
Example 3
In the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62, the chemical components in percentage by weight are as follows: c: 0.004%, Si: 2.0%, Mn: 0.25%, Als: 0.35%, S: 0.004%, P: 0.04%, N: 0.003%, Ti: 0.005% and the balance of Fe and inevitable impurities.
The production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62 is basically the same as that of the embodiment 1, and is different in that the molten steel with the chemical components is continuously cast into a slab with the thickness of 220mm, and then the slab is directly put into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1220 ℃, and the heating and heat preservation time is 220 min.
In this example, the above cast slab was finish-rolled to a hot-rolled plate having a thickness of 2.5mm by 7 passes, the finish rolling temperature was 890 ℃, the coiling temperature was 650 ℃, and the slab was naturally cooled to normal temperature.
In the normalizing pickling process of the embodiment, the normalizing temperature is 940 ℃, the normalizing time is 2.5min, the shot blasting treatment is performed after the normalization to remove the iron scales on the surface of the strip steel, and then the pickling is performed by hydrochloric acid at the pickling temperature of 85 ℃, so that the surface of the strip steel is ensured to be cleaned.
In this embodiment, the normalized plate with the clean surface is subjected to 6 passes of rolling by a single cold rolling method, the total rolling reduction is 86%, and the target thickness of the cold-rolled product is 0.35 mm.
In the embodiment, the temperature of continuous annealing is controlled to 950 ℃, the annealing time is controlled to 260s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. And after annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 530 ℃.
The finished product of the non-oriented silicon steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/502.78W/Kg, magnetic induction B50001.69T, 253MPa of yield strength, 0.61 of tensile strength-to-yield ratio and 58 mu m of average grain size of product structure.
Example 4
In the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62, the chemical components in percentage by weight are as follows: c: 0.005%, Si: 1.9%, Mn: 0.36%, Als: 0.35%, S: 0.004%, P: 0.04%, N: 0.003%, Ti: 0.004%, and the balance of Fe and inevitable impurities.
The production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.6-0.62 is basically the same as that of the embodiment 1, and is different in that the molten steel with the chemical components is continuously cast into a plate blank with the thickness of 240mm, and then the plate blank is directly placed into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1180 ℃, and the heating and heat preservation time is 230 min.
In this example, the above cast slab was finish-rolled to a hot-rolled plate having a thickness of 2.5mm by 7 passes, the finish rolling temperature was 880 ℃, the coiling temperature was 630 ℃, and the slab was naturally cooled to normal temperature.
In the normalizing pickling process of the embodiment, the normalizing temperature is 930 ℃, the normalizing time is 2.5min, the shot blasting treatment is performed after the normalization to remove the iron scales on the surface of the strip steel, and then the pickling is performed by using hydrochloric acid at the pickling temperature of 80 ℃, so that the surface of the strip steel is ensured to be cleaned.
In this embodiment, the normalized plate with the clean surface is subjected to 6 passes of rolling by a single cold rolling method, the total rolling reduction is 85%, and the target thickness of the cold-rolled product is 0.35 mm.
In the embodiment, the temperature of continuous annealing is controlled at 940 ℃, the annealing time is controlled at 300s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. And after annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 600 ℃.
The finished product of the non-oriented silicon steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/502.85W/Kg, magnetic induction B50001.70T, 255MPa of yield strength, 0.62 of tensile strength-to-yield ratio and 52 mu m of average grain size of product structure.
Example 5
The cold-rolled non-oriented silicon steel with different yield ratios of the embodiment comprises the following chemical components in percentage by weight: c: 0.005%, Si: 1.8%, Mn: 0.2%, Als: 0.3%, S: 0.004%, P: 0.03%, N: 0.005%, Ti: 0.004%, and the balance of Fe and inevitable impurities.
According to the production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.67-0.69, the molten steel with the components is continuously cast into a plate blank with the thickness of 200-260 mm, and then the plate blank is directly placed into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the heating and heat preservation time is not less than 210 min. Because the yield strength of the product can be improved by low-temperature hot rolling, the tensile strength is not obviously improved, and the yield ratio of the product is obviously improved, the temperature of the heating furnace is not easy to be too high and is controlled within 1200 ℃, and therefore, the temperature of the heating furnace is controlled between 1050 ℃ and 1200 ℃. Specifically, in the embodiment, the thickness of the slab is 200mm, the temperature of the heating furnace is 1050 ℃, and the heating and heat preservation time is 210 min.
In this embodiment, the thickness of the hot rolled sheet has a significant effect on the yield ratio of the finished product, the thickness of the hot rolled sheet is reduced, and the yield ratio of the finished product is improved. In order to improve the yield ratio, the thickness of the hot rolled plate is not easy to be too thick, and the casting blank is subjected to hot rolling for 7 times and is subjected to finish rolling to obtain the hot rolled plate with the thickness of 2.0-2.3 mm. The product strength can be improved by considering low-temperature final rolling and low-temperature curling, wherein the yield strength is improved in a large range, and the yield ratio of a finished product is improved, so that the final rolling coiling temperature is not easy to be too high, the final rolling temperature is controlled within 860 ℃, the curling temperature is controlled within 610 ℃, the requirements of the product magnetic property and the yield ratio are integrated, the final rolling temperature is controlled within 820-860 ℃, the curling temperature is controlled within 550-610 ℃, and the product is naturally cooled to the normal temperature. Specifically, the thickness of the hot rolled plate in this example was 2.0mm, the finish rolling temperature was 820 ℃ and the curling temperature was 550 ℃.
In the embodiment, the hot-rolled strip steel passes through a normalizing pickling line, in order to improve the product strength, the product yield ratio and the average grain size of the product structure, low-temperature normalizing is adopted, the normalizing temperature is controlled within 870 ℃, but in order to ensure that the grain size of a normalizing plate is increased and the magnetic performance of the product is improved, the normalizing temperature is controlled between 840 ℃ and 870 ℃, and is normalized for 2min to 3 min; after normalizing, shot blasting is carried out to remove the iron scale on the surface of the strip steel, and then acid washing is carried out by 55 percent hydrochloric acid at the acid washing temperature of 75-90 ℃ to ensure that the surface of the strip steel is cleaned. Specifically, in this embodiment, the normalizing temperature is 840 ℃, the normalizing time is 2min, and the pickling temperature is 75 ℃.
Since the increase of the cold rolling pass is helpful for improving the yield ratio of the product, in order to increase the yield ratio of the product, the normalizing plate is rolled by 6 to 7 passes by adopting a one-time cold rolling method in the embodiment, the total cold rolling reduction rate is 82 to 85 percent, and the target thickness of the finished product is 0.35 mm. Specifically, in the embodiment, the normalizing plate is subjected to 7-pass rolling by adopting a one-time cold rolling method, and the total cold rolling reduction rate is 82%.
In the embodiment, the influence of the continuous annealing temperature on the magnetic property and the mechanical property of the product is larger, the lower the annealing temperature is, the smaller the average grain size is, the higher the yield strength and the tensile strength are, but the yield strength increase amplitude is larger, the higher the product yield ratio is, but the product iron loss is increased, the magnetic property and the yield ratio of the product are comprehensively considered, the annealing temperature is controlled to be 840-890 ℃, the annealing time is 240-480 s, and H is controlled to be H2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. In consideration of the high annealing temperature in the scheme, the surface of the strip steel is subjected to alkali rinsing, alkali scrubbing and electrolytic cleaning to remove residual oil and residual iron on the surface before annealing, the phenomenon of furnace bottom roller nodulation caused by oil stain and residual iron on the surface of the strip steel is prevented, and the residual oil entering the front surface of the strip steel of the annealing furnace is less than or equal to 250mg/m2The total amount of iron powder is less than or equal to 100mg/m2. After annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 380-650 ℃. Specifically, in the embodiment, the annealing temperature is 840 ℃, and the annealing time is 480 s; the curing temperature was 380 ℃. In this embodiment, the annealed strip steel is cooled in two stages, the first stage is a high temperature slow cooling stage with a cooling speed V1The control should be as follows: v is less than or equal to 3 ℃/s1The temperature is less than or equal to 5 ℃/s, the structure crystal grains can be refined by rapid cooling after the annealing of the strip steel, the yield strength of the product is improved, and the yield ratio is improved; the second section is a controlled cooling section with a cooling speed V2The cooling speed is controlled to be more than 12 ℃/s, but the residual stress of the strip steel is increased by rapid cooling, the magnetic property of the product is deteriorated, so the cooling speed is not easy to be overhigh, the magnetic property and the yield ratio of the product with comprehensive opening rate are integrated, and the cooling speed V of the cooling section is controlled in the second section2The control should be as follows: cooling speed V is less than or equal to 12 ℃/s2The temperature is less than or equal to 16 ℃/s. Specifically, the first-stage cooling rate V in the present embodiment1At 5 ℃/s, a first stage cooling rate V2At 12 ℃/s.
The finished product of the non-oriented electrical steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/503.2W/Kg, magnetic induction B50001.68T, yield strength 280MPa, yield ratio 0.67 and average grain size of product structure 40 micron.
Example 6
The cold-rolled non-oriented silicon steel with different yield ratios of the embodiment comprises the following chemical components in percentage by weight: c: 0.004%, Si: 2.1%, Mn: 0.4%, Als: 0.5%, S: 0.005%, P: 0.04%, N: 0.003%, Ti: 0.005% and the balance of Fe and inevitable impurities.
The production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.67-0.69 is basically the same as that of the embodiment 5, and is different in that the molten steel with the chemical components is continuously cast into a slab with the thickness of 260mm, and then the slab is directly put into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1200 ℃, and the heating and heat preservation time is 220 min.
In this example, the above cast slab was finish-rolled to a hot-rolled plate having a thickness of 2.3mm by 7 passes, the finish rolling temperature was 860 ℃, the coiling temperature was 610 ℃, and the slab was naturally cooled to normal temperature.
In the normalizing pickling process of the embodiment, the normalizing temperature is 870 ℃, the normalizing time is 3min, after normalization, shot blasting is performed to remove iron scales on the surface of the strip steel, and then hydrochloric acid is used for pickling, wherein the pickling temperature is 90 ℃, so that the surface of the strip steel is ensured to be cleaned.
In this embodiment, the normalized plate with the clean surface is subjected to 7-pass rolling by a one-pass cold rolling method, the total rolling reduction is 85%, and the target thickness of the cold-rolled product is 0.35 mm.
In the embodiment, the temperature of continuous annealing is controlled to be 890 ℃, the annealing time is controlled to be 240s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. And after annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 650 ℃. In this embodiment, the annealed strip steel is cooled in two stages, the first stage is a high temperature slow cooling stage with a cooling speed V13 ℃/s, the second section is a controlled cooling section, and the cooling speed V216 ℃/s.
The finished product of the non-oriented silicon steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/502.89W/Kg, magnetic induction B50001.68T, yield strength of 310MPa, tensile strength to yield ratio of 0.69 and average grain size of 25 μm.
Example 7
The cold-rolled non-oriented silicon steel with different yield ratios of the embodiment comprises the following chemical components in percentage by weight: c: 0.004%, Si: 2.0%, Mn: 0.3%, Als: 0.4%, S: 0.005%, P: 0.03%, N: 0.004%, Ti: 0.005% and the balance of Fe and inevitable impurities.
The production method of the cold-rolled non-oriented silicon steel with the yield ratio of 0.67-0.69 is basically the same as that of the embodiment 5, and is different in that the molten steel with the chemical components is continuously cast into a slab with the thickness of 250mm, and then the slab is directly put into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1100 ℃, and the heating and heat preservation time is 230 min.
In the embodiment, the casting blank is subjected to 7-pass finish rolling to obtain a hot rolled plate with the thickness of 2.2mm, the finish rolling temperature is 850 ℃, the coiling temperature is 590 ℃, and the blank is naturally cooled to the normal temperature.
In the normalizing pickling process of the embodiment, the normalizing temperature is 860 ℃, the normalizing time is 2.5min, the shot blasting treatment is performed after the normalization to remove the iron scales on the surface of the strip steel, and then the pickling is performed by hydrochloric acid at the pickling temperature of 80 ℃, so that the surface of the strip steel is ensured to be cleaned.
In this example, the normalized sheet with the cleaned surface was subjected to 6 passes of rolling by a single cold rolling method, the total reduction rate of the cold rolling was 84%, and the target thickness of the cold-rolled product was 0.35 mm.
In the embodiment, the temperature of continuous annealing is controlled to 870 ℃, the annealing time is controlled to 280s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. And after annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 600 ℃. In this embodiment, the annealed strip steel is cooled in two stages, the first stage is a high temperature slow cooling stage with a cooling speed V14 ℃/s, the second section is a controlled cooling section, and the cooling speed V2At 15 ℃/s.
The finished product of the non-oriented silicon steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/503.05W/Kg, magnetic induction B50001.69T, the yield strength is 295MPa, the tensile strength-to-yield ratio is 0.674, and the average grain size of the product structure is 32 mu m.
Example 8
The cold-rolled non-oriented silicon steel with different yield ratios of the embodiment comprises the following chemical components in percentage by weight: c: 0.005%, Si: 1.9%, Mn: 0.25%, Als: 0.35%, S: 0.005%, P: 0.04%, N: 0.005%, Ti: 0.004%, and the balance of Fe and inevitable impurities.
The production method of the cold-rolled non-oriented silicon steel with the yield ratio within the range of 0.67-0.69 is basically the same as that of the embodiment 5, and is different in that the molten steel with the chemical components is continuously cast into a slab with the thickness of 220mm, and then the slab is directly put into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1150 ℃, and the heating and heat preservation time is 220 min.
In this example, the above cast slab was finish-rolled to a hot-rolled plate having a thickness of 2.3mm by 7 passes, the finish rolling temperature was 860 ℃, the coiling temperature was 600 ℃, and the slab was naturally cooled to normal temperature.
In the normalizing pickling process of the embodiment, the normalizing temperature is 850 ℃, the normalizing time is 2.5min, the shot blasting treatment is performed after the normalization to remove the iron scales on the surface of the strip steel, and then the pickling is performed by hydrochloric acid at the pickling temperature of 85 ℃, so that the surface of the strip steel is ensured to be cleaned.
In this example, the normalized plate with the cleaned surface was subjected to 7-pass rolling by a single cold rolling method, the total reduction rate of the cold rolling was 86%, and the target thickness of the cold-rolled product was 0.35 mm.
In the embodiment, the temperature of continuous annealing is controlled to be 850 ℃, the annealing time is controlled to be 260s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7. And after annealing, coating the insulating paint by a coating roller, and curing the insulating paint at the curing temperature of 650 ℃. In this embodiment, the annealed strip steel is cooled in a two-stage mannerOne stage is a high-temperature slow cooling section with a cooling speed V14 ℃/s, the second section is a controlled cooling section, and the cooling speed V2At 14 ℃/s.
The finished product of the non-oriented silicon steel with the thickness of 0.35mm manufactured by the process has the iron loss P1.5/503.15W/Kg, magnetic induction B50001.68T, yield strength 305MPa, tensile strength-to-yield ratio 0.68 and average grain size of product structure 38 μm.
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 (10)

1. Cold rolled non-oriented silicon steel with different yield ratios, which is characterized in that: the chemical components by weight percentage are as follows: c is less than or equal to 0.005%, Si: 1.8% -2.1%, Mn: 0.2% -0.4%, Als: 0.3 to 0.5 percent of the total weight of the alloy, less than or equal to 0.005 percent of S, less than or equal to 0.04 percent of P, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of Ti, and the balance of Fe and inevitable impurities.
2. The method for producing cold-rolled non-oriented silicon steel with yield ratio of 0.6-0.62 as claimed in claim 1, wherein the method comprises the following steps: continuously casting the molten steel into a plate blank with the thickness of 200-260 mm, and then directly loading the plate blank into a heating furnace for heating, wherein the temperature of the heating furnace is controlled at 1200-1300 ℃, and the heating and heat preservation time is not less than 210 min.
3. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.6-0.62 as claimed in claim 2, wherein: the casting blank is subjected to 7-pass finish rolling to obtain a hot rolled plate with the thickness of 2.3-2.6 mm, the finish rolling temperature is controlled to be 860-900 ℃, the curling temperature is controlled to be 600-660 ℃, and the plate is naturally cooled to the normal temperature.
4. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.6-0.62 as claimed in claim 3, wherein the method comprises the following steps: the hot-rolled strip steel passes through a normalizing pickling line, the normalizing temperature is controlled between 900 ℃ and 960 ℃, and the normalizing time is 2min to 4 min; after normalizing, shot blasting is carried out to remove the iron scale on the surface of the strip steel, and then hydrochloric acid is adopted for acid cleaning, wherein the acid cleaning temperature is 75-90 ℃, so as to ensure that the surface of the strip steel is cleaned.
5. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.6-0.62 as claimed in claim 4, wherein: the temperature of continuous annealing is controlled to be 920-960 ℃, the annealing time is controlled to be 240-480 s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7.
6. The method for producing cold-rolled non-oriented silicon steel with yield ratio of 0.67-0.69 as claimed in claim 1, wherein the method comprises the following steps: continuously casting the molten steel into a plate blank with the thickness of 200-260 mm, and then directly loading the plate blank into a heating furnace for heating, wherein the temperature of the heating furnace is controlled to be 1050-1200 ℃, and the heating and heat preservation time is not less than 210 min.
7. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.67-0.69 as claimed in claim 6, wherein the method comprises the following steps: the casting blank is subjected to 7-pass finish rolling to obtain a hot rolled plate with the thickness of 2.0-2.3 mm, the finish rolling temperature is controlled to be 820-860 ℃, the curling temperature is controlled to be 550-610 ℃, and the plate is naturally cooled to the normal temperature.
8. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.67-0.69 as claimed in claim 7, wherein the method comprises the following steps: the hot-rolled strip steel passes through a normalizing pickling line, the normalizing temperature is controlled between 840 ℃ and 870 ℃, and the normalizing time is 2min to 3 min; after normalizing, shot blasting is carried out to remove the iron scale on the surface of the strip steel, and then hydrochloric acid is adopted for acid cleaning, wherein the acid cleaning temperature is 75-90 ℃, so as to ensure that the surface of the strip steel is cleaned.
9. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.67-0.69 as claimed in claim 8, wherein: the temperature of continuous annealing is controlled to be 840-890 ℃, the annealing time is controlled to be 240-480 s, and H is adopted2And N2And carrying out continuous annealing by taking protective atmosphere according to the proportion of 3: 7.
10. The method for producing cold-rolled non-oriented silicon steel with yield ratio in the range of 0.67-0.69 as claimed in claim 9, wherein: the annealed strip steel adopts a two-stage cooling mode, the first stage is a high-temperature slow cooling stage, and the cooling speed V of the strip steel1The control should be as follows: v is less than or equal to 3 ℃/s1Less than or equal to 5 ℃/s; the second stage is a controlled cooling stage with a cooling rate V2The control should be as follows: cooling speed V is less than or equal to 12 ℃/s2≤16℃/s。
CN202010976898.1A 2020-09-17 2020-09-17 Cold-rolled non-oriented silicon steel with different yield ratios and production methods of two products thereof Pending CN112159927A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105950960A (en) * 2016-05-04 2016-09-21 武汉钢铁股份有限公司 Non-oriented silicon steel for drive motor of electric automobile and preparation method thereof
US20170314087A1 (en) * 2014-10-20 2017-11-02 Arcelormittal Method of production of tin containing non grain-oriented silicon steel sheet , steel sheet obtained and use thereof
CN108517395A (en) * 2018-05-17 2018-09-11 马鞍山钢铁股份有限公司 A kind of cold rolling non-oriented electrical steel band and preparation method thereof
CN109022703A (en) * 2018-10-29 2018-12-18 武汉钢铁有限公司 A kind of non-orientation silicon steel that magnetic anisotropy is low and its manufacturing method
CN110241359A (en) * 2019-07-30 2019-09-17 马鞍山钢铁股份有限公司 A kind of ultra high efficiency invariable frequency compressor non-oriented electrical steel and preparation method thereof
CN111455150A (en) * 2020-04-22 2020-07-28 马鞍山钢铁股份有限公司 Non-oriented electrical steel for non-standard-thickness electric bicycle motor and production method thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170314087A1 (en) * 2014-10-20 2017-11-02 Arcelormittal Method of production of tin containing non grain-oriented silicon steel sheet , steel sheet obtained and use thereof
CN105950960A (en) * 2016-05-04 2016-09-21 武汉钢铁股份有限公司 Non-oriented silicon steel for drive motor of electric automobile and preparation method thereof
CN108517395A (en) * 2018-05-17 2018-09-11 马鞍山钢铁股份有限公司 A kind of cold rolling non-oriented electrical steel band and preparation method thereof
CN109022703A (en) * 2018-10-29 2018-12-18 武汉钢铁有限公司 A kind of non-orientation silicon steel that magnetic anisotropy is low and its manufacturing method
CN110241359A (en) * 2019-07-30 2019-09-17 马鞍山钢铁股份有限公司 A kind of ultra high efficiency invariable frequency compressor non-oriented electrical steel and preparation method thereof
CN111455150A (en) * 2020-04-22 2020-07-28 马鞍山钢铁股份有限公司 Non-oriented electrical steel for non-standard-thickness electric bicycle motor and production method thereof

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