CN112921164A - Low-iron-loss high-permeability non-oriented electrical steel and production method thereof - Google Patents

Low-iron-loss high-permeability non-oriented electrical steel and production method thereof Download PDF

Info

Publication number
CN112921164A
CN112921164A CN202110089370.7A CN202110089370A CN112921164A CN 112921164 A CN112921164 A CN 112921164A CN 202110089370 A CN202110089370 A CN 202110089370A CN 112921164 A CN112921164 A CN 112921164A
Authority
CN
China
Prior art keywords
equal
percent
less
annealing
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110089370.7A
Other languages
Chinese (zh)
Other versions
CN112921164B (en
Inventor
程国庆
裴英豪
施立发
何志坚
刘青松
陆天林
祁旋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maanshan Iron and Steel Co Ltd
Original Assignee
Maanshan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maanshan Iron and Steel Co Ltd filed Critical Maanshan Iron and Steel Co Ltd
Priority to CN202110089370.7A priority Critical patent/CN112921164B/en
Publication of CN112921164A publication Critical patent/CN112921164A/en
Application granted granted Critical
Publication of CN112921164B publication Critical patent/CN112921164B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C21D1/30—Stress-relieving
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/84—Controlled slow cooling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D8/1233—Cold 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—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

Abstract

The invention discloses a non-oriented electrical steel with low iron loss and high magnetic permeability and a production method thereof: continuously casting molten steel into a plate blank, heating the plate blank by a heating furnace, then carrying out hot rolling to obtain a hot rolled plate, and then coiling at 500-650 ℃ after air cooling and water cooling; the hot rolled plate is subjected to normalizing treatment and hydrochloric acid pickling; cold rolling on a reversible rolling mill after acid washing; finally, annealing the finished product, wherein the annealing temperature is 840-900 ℃, and the heating time is 240-500 s; then cooling to below 500 ℃ at a cooling rate of not more than 3 ℃/s; coating an insulating coating, curing, and annealing for the second time to obtain the non-oriented electrical steel with low iron loss, high magnetic conductivity and magnetic property meeting P1.5/50≤3.50W/kg，μ1.5≥3800Gs/Oe，B5000Not less than 1.76T.

Description

Low-iron-loss high-permeability non-oriented electrical steel and production method thereof
Technical Field
The invention belongs to the technical field of non-oriented electrical steel production, and particularly relates to a low-iron-loss high-permeability non-oriented electrical steel and a production method thereof.
Background
Some special high-efficiency motors require electrical steel materials with better magnetic property, many domestic enterprises put forward higher requirements on the magnetic induction B5000 of steel sheets, and some special enterprises put forward the requirement of mu on the magnetic conductivity under 1.5T1.5As a standard for enterprise material selection. Therefore, for preparing the core material of the motor, the non-oriented electrical steel has higher magnetic induction and magnetic permeability under the condition of requiring lower iron loss. However, in the case of electrical steel, iron loss inevitably deteriorates in the process of increasing the permeability. How to adjust the contradiction between the iron loss and the magnetic permeability becomes a key direction and a difficult point of attack for the research and development of the electrical steel for the high-efficiency compressor.
Disclosure of Invention
In order to solve the technical problems, the invention provides a non-oriented electrical steel with low iron loss and high magnetic permeability and a production method thereof. The production process parameters of each step in the production process are controlled to obtain the cold-rolled non-oriented electrical steel with low iron loss and high magnetic permeability, and the magnetic property of the cold-rolled non-oriented electrical steel meets the requirement of P1.5/50≤3.50W/kg，μ1.5≥3800Gs/Oe，B5000Not less than 1.76T.
The technical scheme adopted by the invention is as follows:
a method for producing a non-oriented electrical steel having low core loss and high permeability, said method comprising the steps of:
(1) continuously casting the molten steel into a plate blank;
(2) heating the plate blank by a heating furnace, carrying out hot rolling to obtain a hot rolled plate, and then coiling the hot rolled plate at 500-650 ℃ after air cooling and water cooling;
(3) the hot rolled plate is subjected to normalizing treatment;
(4) pickling the coil with hydrochloric acid, and cold rolling on a reversible rolling mill after pickling;
(5) finally, annealing of a finished product: the annealing temperature is 840-900 ℃, and the heating time is 240-500 s; then cooling to below 500 ℃ at a cooling speed of not more than 3 ℃/s, and air-cooling to room temperature;
(6) coating insulating coating, solidifying and obtaining iron loss P of electric steel1.5/50≤4.5W/kg、B5000≥1.76T、μ1.5The low iron loss high magnetic permeability non-oriented electrical steel is more than or equal to 3000 Gs/Oe.
(7) And (5) secondary annealing.
Further, in the step (1), the thickness of the plate blank is 200-300 mm.
In the step (2), the temperature of the heating furnace is controlled to be 1100-1200 ℃, and the heating and heat preservation time is not less than 210 min.
In the step (2), the finishing temperature of hot rolling is controlled to be 830-850 ℃; the thickness of the hot-rolled plate is 2.0 to 2.5 mm.
In the step (3), the normalizing temperature is 880-950 ℃, and the normalizing speed is 20-25 m/s.
In the step (4), cold rolling is carried out for 5 times, and the total reduction rate of the cold rolling is 75-85%; the roller ground by a No. 1000 fine grinding wheel is used for the last time in cold rolling, and then Al is used2O3Grinding to Ra less than or equal to 0.1 μm, soaking in alkali metal salt water solution for 15s before annealing after cold rolling, and annealing.
In the step (5), a rapid heating mode is adopted in a heating section during annealing, the plate temperature is heated to a target annealing temperature from room temperature within 35-45 s at a speed of 85-95 m/min, compared with the traditional mode, firstly, the air combustion ratio of an open flame heating area needs to be controlled to be 0.85-0.95, the temperature is adjusted to be 600-700 ℃, the atmosphere hydrogen content in an electric heating furnace is adjusted to be 40%, the electric heating furnace is heated in two sections, the heating temperature of the first section is set to be higher than the target temperature by 50 ℃, so that the sample plate is rapidly heated to the target temperature for heat preservation, the heating temperature of the second section is 840-900 ℃, the heating time is 240-500 s, the dew point is controlled to be below-20 ℃, then, the sample plate is cooled to be below 500 ℃ at a cooling speed of no more than 3 ℃/s, and then;
in the step (5), the protective atmosphere in the annealing furnace during annealing is H2And N2Mixed gas of (2), H2And N2Is 4: 6.
In the step (6), the curing temperature is 570-590 ℃, and preferably 580 ℃.
And (7) carrying out secondary annealing under the protection of nitrogen, wherein the annealing temperature is 700-850 ℃, the heat preservation time is 2-2.5 h, and cooling to room temperature at the speed of less than 3 ℃/s after annealing. The secondary annealing can release the internal stress caused by the cooling, curling process and processing blanking so as to improve the magnetic permeability mu1.5Annealing to obtain iron loss P1.5/50≤3.5W/kg、B5000≥1.76T、μ1.5The low iron loss high magnetic permeability non-oriented electrical steel is more than or equal to 3800 Gs/Oe.
The invention also provides the non-oriented electrical steel with low iron loss and high magnetic permeability, which is produced according to the production method and comprises the following chemical components in percentage by weight: c is less than or equal to 0.0030 percent; si is more than or equal to 0.10 percent and less than or equal to 1.00 percent; mn is more than or equal to 0.10 percent and less than or equal to 0.40 percent; p is less than or equal to 0.0050 percent; als is more than or equal to 0.50 percent and less than or equal to 1.00 percent; s is less than or equal to 0.0025 percent; n is less than or equal to 0.0025 percent; ti is less than or equal to 0.0025 percent; c + S + N + Ti: less than or equal to 85ppm, and the content of each element is less than or equal to 25 ppm; the balance of Fe and inevitable impurities.
The components have the following functions:
C. s, N, Ti is harmful element, and when C content exceeds 0.003%, magnetic aging is caused to deteriorate iron loss during silicon steel use, and coercive force and hysteresis loss are improvedThe magnetic induction intensity is reduced; when the S and N contents are high, a large amount of MnS and Cu are generated2S, AlN and other impurities affect the performance of silicon steel, and the important target of the processes of heating, hot rolling and normalizing the casting blank is to control the precipitation of fine MnS particles and coarsen the existing MnS, so that the proportion of S and N is not more than 0.0025 percent; when the content of Ti is increased, a large amount of fine and stable Ti (CN) inclusions can be formed to inhibit the growth of crystal grains, {111} crystal grains in a finished product are increased, and {100} crystal grains are reduced, so that the content of Ti is controlled to be below 0.003%;
si, Als: the content of Si and Asl is increased, the crystal grains of the finished product are coarsened, the quantity of domain walls is reduced, the eddy current loss is reduced, and the iron loss of the finished product is reduced, the content of Als is required to be not less than 0.5% and not more than 1.0% for improving the magnetic conductivity and the resistivity, and the improvement of the magnetic conductivity is not facilitated when the content of Als exceeds 1.0%.
Mn: mn has little influence on magnetic induction, and is generally controlled below 0.4%, and when the Mn content is more than 0.8%, the magnetic permeability is reduced along with the increase of the Mn content.
The main aspects influencing the magnetic conductivity are alloy elements, impurities, an oxidation layer, internal stress and the like in the silicon steel, and the invention mainly obtains excellent low iron loss and high magnetic conductivity mu by improving the oxidation layer and the internal stress on the basis of certain components1.5Non-oriented electrical steel. The heating temperature and the air-fuel ratio of the open flame section are improved, and the oxygen and the iron are mainly prevented from generating oxidation reaction to form an internal oxidation layer under the high-temperature condition, and the oxidation is difficult to reduce under the high-hydrogen condition. The electric heating furnace section mainly inhibits the generation of an internal oxidation layer and a nitriding layer through a high reducing atmosphere because nitrogen diffuses into steel to form the internal nitriding layer under a high temperature condition. The thicknesses of the internal oxide layer and the nitride layer are reduced, and the magnetic permeability is improved. The heating rate is controlled to improve the nucleation proportion of the texture, so that the magnetic conductivity is improved, and the magnetic conductivity is reduced along with the increase of the internal stress due to the over-high cooling rate.
The invention adopts the control of the proportion of each mixed element component, firstly carries out the normalizing process to control the favorable texture proportion of the steel coil, simultaneously controls the air combustion ratio of an open flame heating zone relative to the traditional mode, adjusts the atmosphere in the electric heating furnace to adjust the hydrogen content of 40 percent, heats the electric heating furnace in two sections, heats the first section of the heating furnaceSetting the temperature to be higher than the target temperature by 50 ℃, quickly heating the sample plate to the target temperature for heat preservation, controlling the dew point to be lower than-20 ℃, then cooling to be lower than 500 ℃ at the cooling speed of not more than 3 ℃/s, performing air cooling to room temperature, effectively ensuring the thickness reduction of an oxide layer, improving favorable texture components, reducing the temperature by adopting a slow cooling mode, improving the internal stress caused by cooling, improving the magnetic conductivity, and enabling the performance to reach P1.5/50≤4.5W/kg、B5000≥1.76T、μ1.5More than or equal to 3000Gs/Oe, and secondary annealing to release the internal stress caused by cooling, curling and processing blanking so as to improve the magnetic permeability mu1.5To achieve performance up to P1.5/50≤3.50W/kg，μ1.5≥3800Gs/Oe，B5000≥1.76T。
Drawings
FIG. 1 is a metallographic structure diagram of a low-core-loss high-permeability non-oriented electrical steel in example 1;
FIG. 2 is a structural diagram of a low core loss high permeability nonoriented electrical steel in example 1,
fig. 3 is a weave pattern of the non-oriented electrical steel in comparative example 1.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1
1) Adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements;
2) continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220mm, wherein the plate blank comprises the following chemical components in percentage by weight: 0.90 percent; and Als: 0.57 percent; mn: 0.24 percent; p: 0.005 percent; c + S + N + Ti: 55ppm, the content of each element is less than or equal to 25ppm, and the balance is Fe and inevitable impurity elements;
3) heating the continuously cast plate blank by a heating furnace at 1180 ℃ for 210min, then carrying out 3-pass rough rolling to 34mm, carrying out 7-pass finish rolling to 2.2mm in thickness, controlling the finish rolling temperature at 830 ℃, cooling in air, and then cooling to 580 ℃ for coiling;
4) carrying out a normalizing process on a hot plate, wherein the normalizing temperature is 900 ℃, and the normalizing speed is 23 m/s;
5) pickling a hot rolled plate with 58% hydrochloric acid, wherein the pickling temperature is 80 ℃, and cold rolling on a reversible rolling mill after pickling: ra of the roller used in the first four passes is 0.3-0.6 mu m, the roller ground by a No. 1000 fine grinding wheel is used in the last pass during cold rolling, and Al is used2O3Grinding to Ra of less than or equal to 0.1 μm, soaking in alkali metal salt water solution for 15s before annealing after cold rolling, and annealing;
6) performing 5-pass cold rolling to obtain a target thickness of 0.5mm, and controlling the total reduction rate of the cold rolling to be 77%;
7) heating the plate temperature to 880 ℃ from room temperature through 40s, controlling the air combustion ratio of an open flame heating area to 0.9 at the speed of 90m/min, adjusting the temperature to 650 ℃, adjusting the atmosphere in an electric heating furnace to adjust the hydrogen content of 40%, heating the electric heating furnace in two sections, setting the first section heating temperature to 930 ℃, rapidly heating the sample plate to the target temperature for heat preservation, heating the second section heating temperature to 880 ℃, heating the sample plate for 300s, controlling the dew point to be below minus 20 ℃, cooling the sample plate to below 500 ℃ at the cooling speed of 2 ℃/s, and cooling the sample plate to room temperature through air cooling;
8) coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
9) Processing the sample into a square ring sample with test performance, carrying out secondary annealing under the protection of pure nitrogen, wherein the annealing temperature is 750 ℃, keeping the temperature for 2h, cooling to room temperature at the cooling speed of 2 ℃/s, and carrying out nitrogen protection in the whole process.
The cold-rolled non-oriented electrical steel strip manufactured by the process has excellent surface quality and P of finished products1.5/503.41W/kg, magnetic induction B5000＝1.762T，μ1.5＝3921Gs/Oe。
The metallographic phase of the finished product is shown in figure 1; the final weave pattern is shown in FIG. 2. from comparison with the weave pattern of comparative example 1 (FIG. 3), the final product of this example 1 has a strong {001}<110>The texture, {111} orientation texture is weaker, the grain size of each orientation is obviously increased, small-size grains are reduced, the strength of the texture with harmful {111} orientation is reduced by about 2.5%, the average grain size is increased by about 31 μm, the strength of the texture with favorable {100} orientation is increased by about 3.0%, and the average grain size is reducedThe particle size increased by about 24 μm. Is beneficial to the increase of texture and the increase of magnetic permeability mu1.5And magnetic induction B5000。
Example 2
1) Adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements;
2) continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220mm, wherein the plate blank comprises the following chemical components in percentage by weight: 0.90 percent; and Als: 0.57 percent; mn: 0.24 percent; p: 0.005 percent; c + S + N + Ti: 55ppm, the content of each element is less than or equal to 25ppm, and the balance is Fe and inevitable impurity elements;
3) heating the continuously cast plate blank by a heating furnace at 1180 ℃ for 210min, then carrying out 3-pass rough rolling to 34mm, carrying out 7-pass finish rolling to 2.2mm in thickness, controlling the finish rolling temperature at 830 ℃, cooling in air, and then cooling to 580 ℃ for coiling;
4) carrying out a normalizing process on a hot plate, wherein the normalizing temperature is 950 ℃, and the normalizing speed is 23 m/s;
5) pickling the hot rolled plate with 58% hydrochloric acid at 80 deg.C, cold rolling on a reversible mill with Ra of rollers 0.3-0.6 μm for the first four passes, grinding with No. 1000 fine grinding wheel for the last pass, and using Al2O3Grinding to Ra of less than or equal to 0.1 μm, soaking in alkali metal salt water solution for 15s before annealing after cold rolling, and annealing;
6) performing 5-pass cold rolling to obtain a target thickness of 0.5mm, and controlling the total reduction rate of the cold rolling to be 77%;
7) heating the plate temperature to 880 ℃ from room temperature through 40s, controlling the air combustion ratio of an open flame heating area to about 0.9 at a speed of 90m/min, adjusting the temperature to 650 ℃, adjusting the atmosphere in an electric heating furnace to adjust the hydrogen content of 40%, heating the electric heating furnace in two sections, setting the heating temperature of the first section to be 930 ℃, rapidly heating the sample plate to the target temperature for heat preservation, heating the second section to 880 ℃, heating for 300s, controlling the dew point to be below minus 20 ℃, cooling to below 500 ℃ at a cooling speed of 2 ℃/s, and air cooling to room temperature;
8) coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
9) Processing the sample into a square ring sample with test performance, carrying out secondary annealing under the protection of pure nitrogen, wherein the annealing temperature is 750 ℃, keeping the temperature for 2h, cooling to room temperature at the cooling speed of 2 ℃/s, and carrying out nitrogen protection in the whole process.
The cold-rolled non-oriented electrical steel strip manufactured by the process has excellent surface quality, and the metallographic phase of a finished product is shown in figure 1. P of the finished product1.5/503.45W/kg, magnetic induction B5000＝1.761T，μ1.5＝3891Gs/Oe。
Example 3
1) Adding molten iron into an RH furnace for refining and alloying treatment, and adding various alloying elements according to the component design requirements;
2) continuously casting molten steel refined by an RH furnace into a plate blank with the thickness of 220mm, wherein the plate blank comprises the following chemical components in percentage by weight: 0.90 percent; and Als: 0.57 percent; mn: 0.24 percent; p: 0.005 percent; c + S + N + Ti: 55ppm, the content of each element is less than or equal to 25ppm, and the balance is Fe and inevitable impurity elements;
3) heating the continuously cast plate blank by a heating furnace at 1180 ℃ for 210min, then carrying out 3-pass rough rolling to 34mm, carrying out 7-pass finish rolling to 2.2mm in thickness, controlling the finish rolling temperature at 830 ℃, cooling in air, and then cooling to 580 ℃ for coiling;
4) the hot plate is used for normalizing at 900 deg.C and normalizing speed of 23 m/s.
5) Pickling the hot rolled plate with 58% hydrochloric acid at 80 deg.C, cold rolling on a reversible mill with Ra of rollers 0.3-0.6 μm for the first four passes, grinding with No. 1000 fine grinding wheel for the last pass, and using Al2O3Grinding to Ra of less than or equal to 0.1 μm, soaking in alkali metal salt water solution for 15s before annealing after cold rolling, and annealing;
6) performing 5-pass cold rolling to obtain a target thickness of 0.5mm, and controlling the total reduction rate of the cold rolling to be 77%;
7) heating the plate temperature to 880 ℃ from room temperature through 40s, controlling the air combustion ratio of an open flame heating area to about 0.9 at a speed of 90m/min, adjusting the temperature to 650 ℃, adjusting the atmosphere in an electric heating furnace to adjust the hydrogen content of 40%, heating the electric heating furnace in two sections, setting the heating temperature of the first section to be higher than the target temperature 930 ℃, rapidly heating the sample plate to the target temperature for heat preservation, heating the second section to 880 ℃, heating the sample plate for 300s, controlling the dew point to be below-20 ℃, cooling the sample plate to be below 500 ℃ at a cooling speed of 3 ℃/s, and air cooling the sample plate to room temperature;
8) coating the insulating paint by a coating roller, and curing the insulating paint at 580 ℃.
9) Processing the sample into a square ring sample with test performance, carrying out secondary annealing under the protection of pure nitrogen, wherein the annealing temperature is 750 ℃, keeping the temperature for 2h, cooling to room temperature at a cooling speed of 3 ℃/s, and carrying out nitrogen protection in the whole process.
The cold-rolled non-oriented electrical steel strip manufactured by the process has excellent surface quality, and the metallographic phase of a finished product is shown in figure 1. P of the finished product1.5/503.45W/kg, magnetic induction B5000＝1.761T，μ1.5＝3891Gs/Oe。
Comparative example 1
Otherwise, the same as example 1 except that the normalizing step in step 4) and the secondary annealing step in step 9) were omitted.
The cold-rolled non-oriented electrical steel strip manufactured by the process has excellent surface quality, the weave pattern is shown as figure 3, and the P is1.5/504.65W/kg, magnetic induction B5000＝1.738T，μ1.5＝2321Gs/Oe。
Comparative example 2
Otherwise, the same as example 1 except that the second annealing step in step 9) was omitted.
The cold-rolled non-oriented electrical steel strip manufactured by the process has excellent surface quality and P of finished products1.5/50Magnetic induction B of 4.13W/kg5000＝1.758T，μ1.5＝3120Gs/Oe。
Comparative example 3
Otherwise, as in example 1, except for step 5), the hot rolled sheet was pickled with 58% hydrochloric acid at 80 ℃, then cold rolled on a reversible mill for 5 passes with a roll having an Ra of 0.3 to 0.6 μm to a target thickness of 0.5mm, and then cold rolled without being immersed in an aqueous alkali metal salt solution.
The cold-rolled non-oriented electrical steel strip manufactured by the process has excellent surface quality and P of finished products1.5/503.56W/kg, magnetic induction B5000＝1.756T，μ1.5＝3723Gs/Oe。
The above detailed description of a low core loss high permeability non-oriented electrical steel and its method of production with reference to the examples is illustrative and not restrictive, and several examples are set forth in the limits of the invention, and thus variations and modifications that do not depart from the general concept of the invention are intended to be within the scope of the invention.

Claims (10)

1. A method for producing a non-oriented electrical steel with low iron loss and high magnetic permeability, characterized in that the method comprises the following steps:
(1) continuously casting the molten steel into a plate blank;
(2) heating the plate blank by a heating furnace, carrying out hot rolling to obtain a hot rolled plate, and then coiling the hot rolled plate at 500-650 ℃ after air cooling and water cooling;
(3) the hot rolled plate is subjected to normalizing treatment;
(4) pickling the coiled sheet with hydrochloric acid; cold rolling on a reversible rolling mill after acid washing;
(5) finally, annealing of a finished product: the annealing temperature is 840-900 ℃, and the heating time is 240-500 s; then cooling to below 500 ℃ at a cooling speed of not more than 3 ℃/s, and air-cooling to room temperature;
(6) coating an insulating coating and curing;
(7) and (5) secondary annealing.
2. The production method according to claim 1, wherein in the step (2), the temperature of the heating furnace is controlled to be 1100-1200 ℃, and the heating and heat preservation time is not less than 210 min.
3. The production method according to claim 1, wherein in the step (2), the finishing temperature of the hot rolling is controlled to be 830-850 ℃; the thickness of the hot-rolled plate is 2.0 to 2.5 mm.
4. The production method according to claim 1, wherein in the step (3), the normalizing temperature is 880-950 ℃ and the normalizing speed is 20-25 m/s.
5. The production method according to claim 1, wherein in the step (4), the cold rolling is performed by 5-pass rolling, and the total reduction rate of the cold rolling is 75-85%.
6. The production method according to claim 1, wherein in the step (5), the protective atmosphere in the annealing furnace at the time of annealing is H2And N2Mixed gas of (2), H2And N2In a volume ratio of 4: 6; the dew point temperature in the annealing furnace is controlled below-20 ℃.
7. The production method according to claim 1, wherein in the step (6), the curing temperature is 570-590 ℃.
8. The production method according to claim 1, wherein in the step (7), secondary annealing is performed under the protection of nitrogen, the annealing temperature is 700-850 ℃, the holding time is 2-2.5 h, and the annealing is followed by cooling to room temperature at a speed of less than 3 ℃/s.
9. The non-oriented electrical steel with low iron loss and high magnetic permeability produced by the production method according to any one of claims 1 to 8, wherein the non-oriented electrical steel comprises the following chemical components in percentage by weight: c is less than or equal to 0.0030 percent; si is more than or equal to 0.10 percent and less than or equal to 1.00 percent; mn is more than or equal to 0.10 percent and less than or equal to 0.40 percent; p is less than or equal to 0.0050 percent; als is more than or equal to 0.50 percent and less than or equal to 1.00 percent; s is less than or equal to 0.0025 percent; n is less than or equal to 0.0025 percent; ti is less than or equal to 0.0025 percent; c + S + N + Ti: less than or equal to 85ppm, and the content of each element is less than or equal to 25 ppm; the balance of Fe and inevitable impurities.
10. The low core loss high permeability non-oriented electrical steel of claim 9, wherein P of the low core loss high permeability non-oriented electrical steel1.5/50≤3.50W/kg，μ1.5≥3800Gs/Oe，B5000≥1.76T。
CN202110089370.7A 2021-01-22 2021-01-22 Low-iron-loss high-permeability non-oriented electrical steel and production method thereof Active CN112921164B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110089370.7A CN112921164B (en) 2021-01-22 2021-01-22 Low-iron-loss high-permeability non-oriented electrical steel and production method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110089370.7A CN112921164B (en) 2021-01-22 2021-01-22 Low-iron-loss high-permeability non-oriented electrical steel and production method thereof

Publications (2)

Publication Number Publication Date
CN112921164A true CN112921164A (en) 2021-06-08
CN112921164B CN112921164B (en) 2022-10-11

Family

ID=76164930

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110089370.7A Active CN112921164B (en) 2021-01-22 2021-01-22 Low-iron-loss high-permeability non-oriented electrical steel and production method thereof

Country Status (1)

Country Link
CN (1) CN112921164B (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2262144A1 (en) * 1998-03-10 1999-09-10 Jeffrey P. Anderson Process of making electrical steels having good cleanliness and magnetic properties
JP2005256019A (en) * 2004-03-09 2005-09-22 Nippon Steel Corp Method for producing non-oriented silicon steel sheet excellent in magnetic characteristic
CN103468907A (en) * 2013-09-18 2013-12-25 济钢集团有限公司 Method for producing cold-rolled non-oriented electrical steel based on ASP (AnGang Strip Production) medium thin slab continuous casting and rolling process
CN103667879A (en) * 2013-11-27 2014-03-26 武汉钢铁(集团)公司 Non-oriented electrical sheet with superior magnetic and mechanical properties, and production method of non-oriented electrical sheet
CN104141092A (en) * 2014-07-17 2014-11-12 北京首钢股份有限公司 Non-oriented electrical steel used for stereoscopic transformer with rolled iron core and production method thereof
CN104480383A (en) * 2014-11-24 2015-04-01 武汉钢铁(集团)公司 High-magnetic-induction non-oriented silicon steel with thickness of 0.35mm for high-efficiency motor and production method thereof
CN105256226A (en) * 2015-11-20 2016-01-20 武汉钢铁(集团)公司 Cold-rolled non-oriented silicon steel low in iron loss and production method
CN110735088A (en) * 2019-11-22 2020-01-31 马鞍山钢铁股份有限公司 Non-oriented silicon steel produced by thin slabs and manufacturing method thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2262144A1 (en) * 1998-03-10 1999-09-10 Jeffrey P. Anderson Process of making electrical steels having good cleanliness and magnetic properties
JP2005256019A (en) * 2004-03-09 2005-09-22 Nippon Steel Corp Method for producing non-oriented silicon steel sheet excellent in magnetic characteristic
CN103468907A (en) * 2013-09-18 2013-12-25 济钢集团有限公司 Method for producing cold-rolled non-oriented electrical steel based on ASP (AnGang Strip Production) medium thin slab continuous casting and rolling process
CN103667879A (en) * 2013-11-27 2014-03-26 武汉钢铁(集团)公司 Non-oriented electrical sheet with superior magnetic and mechanical properties, and production method of non-oriented electrical sheet
CN104141092A (en) * 2014-07-17 2014-11-12 北京首钢股份有限公司 Non-oriented electrical steel used for stereoscopic transformer with rolled iron core and production method thereof
CN104480383A (en) * 2014-11-24 2015-04-01 武汉钢铁(集团)公司 High-magnetic-induction non-oriented silicon steel with thickness of 0.35mm for high-efficiency motor and production method thereof
CN105256226A (en) * 2015-11-20 2016-01-20 武汉钢铁(集团)公司 Cold-rolled non-oriented silicon steel low in iron loss and production method
CN110735088A (en) * 2019-11-22 2020-01-31 马鞍山钢铁股份有限公司 Non-oriented silicon steel produced by thin slabs and manufacturing method thereof

Also Published As

Publication number Publication date
CN112921164B (en) 2022-10-11

Similar Documents

Publication Publication Date Title
JP4126479B2 (en) Method for producing non-oriented electrical steel sheet
CN106702260B (en) A kind of high-magnetic induction, low-iron loss non-orientation silicon steel and its production method
JP5724824B2 (en) Method for producing non-oriented electrical steel sheet with good magnetic properties in rolling direction
WO2010020127A1 (en) Coated semi-processed unoriented electric steel plate and manufacturing method thereof
CN107723591A (en) A kind of new-energy automobile motor cold rolling non-oriented electrical steel and its production method
CN103305748A (en) Non-oriented electrical steel plate and manufacturing method thereof
CN111455150A (en) Non-oriented electrical steel for non-standard-thickness electric bicycle motor and production method thereof
CN100436605C (en) Method for manufacturing non-oriented silicon steel sheet
CN112795731A (en) Cold-rolled steel plate for lampshade and production method thereof
JPH07116510B2 (en) Non-oriented electrical steel sheet manufacturing method
KR100779579B1 (en) Manufacturing method for non-oriented electrical steel sheet having low core loss and high magnetic flux density
JPH08188824A (en) Production of grain oriented silicon steel sheet with ultrahigh magnetic flux density
CN109182907B (en) Method for producing semi-process non-oriented electrical steel by endless rolling
JP3392664B2 (en) Manufacturing method of grain-oriented electrical steel sheet with extremely low iron loss
CN112921164B (en) Low-iron-loss high-permeability non-oriented electrical steel and production method thereof
CN114107799A (en) High-strength silicon steel thin strip plate with excellent high-frequency electromagnetic performance and production process
CN111719078B (en) Production method of non-oriented silicon steel for eliminating corrugated defects
JP3056970B2 (en) Manufacturing method of unidirectional electrical steel sheet with excellent magnetic properties
JP2679928B2 (en) Manufacturing method of grain-oriented electrical steel sheet with extremely low iron loss
GB2060697A (en) Grain-oriented silicon steel production
CN109082596B (en) Non-oriented silicon steel with low iron loss and high magnetic polarization strength and preparation method thereof
CN113512635B (en) Low-iron-loss non-oriented electrical steel suitable for high-frequency working condition and production method thereof
JP2001049351A (en) Production of grain-oriented silicon steel sheet high in magnetic flux density
JPH06240358A (en) Production of nonoriented silicon steel sheet high in magnetic flux density and low in iron loss
CN115369225B (en) Non-oriented silicon steel for new energy driving motor and production method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant