CN116103574A - Steel plate for magnetic shielding and manufacturing method thereof - Google Patents
Steel plate for magnetic shielding and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 10
- 238000009749 continuous casting Methods 0.000 claims abstract description 10
- 229910001208 Crucible steel Inorganic materials 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 238000005266 casting Methods 0.000 claims abstract description 4
- 238000004321 preservation Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 16
- 229910000859 α-Fe Inorganic materials 0.000 claims description 16
- 230000035699 permeability Effects 0.000 claims description 12
- 230000004907 flux Effects 0.000 claims description 5
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 229910001566 austenite Inorganic materials 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 abstract description 11
- 238000010248 power generation Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 9
- 238000013461 design Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- 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
- C21D1/28—Normalising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses a steel plate for magnetic shielding, which contains Fe and unavoidable impurities and also contains the following chemical elements in percentage by mass: c: 0.06-0.15%, si:2.40 to 2.90 percent, mn:0.30 to 0.80 percent, cr is less than or equal to 0.15 percent, and B is less than or equal to 0.0008 percent. In addition, the invention also discloses a manufacturing method of the steel plate for magnetic shielding, which comprises the following steps: (1) Smelting and casting to obtain a continuous casting blank or a die-cast steel ingot; (2) heating; (3) rolling; (4) heat treatment: firstly, normalizing at 850-950 ℃ for 0.5-8 hours; then cooling the steel plate to below 200 ℃ in air; and tempering, wherein the tempering temperature is 700-800 ℃, and the heat preservation is carried out for 1-20h. The steel plate for magnetic shielding has the characteristics of high strength, good plasticity, high magnetic conductivity, high resistivity and low iron loss, can be used for manufacturing products such as a rotor pressing ring and a stator pressing ring of a large-scale generator, plays a role of magnetic shielding, and improves the power generation efficiency.
Description
Technical Field
The present invention relates to a steel material and a method for producing the same, and more particularly to a steel for magnetic shielding and a method for producing the same.
Background
Turbo generators are the core of generator sets, and in recent years, with the improvement of materials and manufacturing processes and the continuous increase of the power generation capacity of an electric power system, the single-machine capacity of a large-sized generator is promoted to be continuously increased.
However, it has been found that an increase in the single-machine capacity of the generator increases the stator load of the generator, which increases the magnetic density in the end regions of the generator, resulting in a significant increase in eddy current losses in the end structures. This problem not only reduces the efficiency of the generator, but also causes local overheating of the generator end area, which in severe cases may affect the reliability of the operation of the motor and even threaten the stable operation of the power system.
Therefore, in order to reduce the energy loss during the operation of the generator and to improve the power generation efficiency and reliability of the generator, it is highly desirable to develop a magnetic shielding material having a high magnetic permeability and a low core loss for manufacturing the generator end clamping ring, so as to ensure that the end space leakage flux is concentrated to a path closure with a low magnetic resistance during the operation of the generator.
Currently, some researchers have conducted related researches on magnetic shielding materials and obtained a certain research result, but the total effect is not ideal and cannot be effectively applied to large industrial generators.
For example, chinese patent document with publication number CN109940943a, publication date 2019, 6 and 28, entitled "ferrite casing material for strong magnetic shielding function inductor and method for producing the same" discloses a magnetic shielding casing material and method for producing the same. The magnetic shield case disclosed in this patent document is mainly formed by pressing ferrite particles, and is mainly used for small electronic components such as flat panels, lighting, automotive electronics, and the like, but is not suitable for large-sized equipment such as industrial generators.
For another example, chinese patent document, publication No. CN101353754B, publication No. 2009, 1 month and 28, entitled "steel for internal magnetic shielding and method for manufacturing same", discloses a magnetic shielding sheet made by cold rolling, which is typically 0.1 to 0.4mm thick and is mainly used for magnetic shielding of electronic books in home television cathode ray tubes; since the cold rolling process is adopted in this patent document, the thickness of the steel sheet is limited and the rigidity required for a large structure is not provided.
For another example, chinese patent publication No. CN108277423B, publication No. 2018, 7 and 13, entitled "a method for producing medium frequency magnetic shielding silicon steel", discloses a method for producing medium frequency magnetic shielding steel sheet, which contains silicon content of 4.5% -7%, while reducing hysteresis loss, but also damaging magnetic permeability, and if such high silicon content is adopted, brittleness is significantly increased due to thickness effect, so that it is impossible to safely use under engineering conditions.
Based on the above, the invention is expected to obtain a novel steel plate for magnetic shielding, which not only has higher strength and better plasticity, but also has the characteristics of high magnetic permeability, high resistivity and low iron loss, and the production process is simple and feasible; the steel plate for magnetic shielding can be used for effectively preparing products such as a rotor pressing ring and a stator pressing ring of a large-sized generator, is effectively applied to the large-sized generator, plays a role of magnetic shielding, and improves power generation efficiency.
Disclosure of Invention
The invention aims to provide a steel plate for magnetic shielding, which has the characteristics of high strength, good plasticity, high magnetic permeability, high resistivity and low iron loss; the steel plate for magnetic shielding can be used for effectively preparing products such as a rotor pressing ring and a stator pressing ring of a large-sized generator, is effectively applied to the large-sized generator, plays a role in effective magnetic shielding, and improves power generation efficiency.
In order to achieve the above object, the present invention provides a steel sheet for magnetic shielding, which contains Fe and unavoidable impurities, and which further contains the following chemical elements in mass percent:
C：0.06～0.15％，Si：2.40～2.90％，Mn：0.30～0.80％，Cr≤0.15％，B≤0.0008％。
further, in the steel sheet for magnetic shielding according to the present invention, the mass percentages of the chemical elements are:
c: 0.06-0.15%, si:2.40 to 2.90 percent, mn:0.30 to 0.80 percent, cr is less than or equal to 0.15 percent, and B is less than or equal to 0.0008 percent; the balance being Fe and unavoidable impurities.
In the steel sheet for magnetic shielding according to the present invention, the design principle of each chemical element is as follows:
c: the steel sheet for magnetic shielding according to the present invention can ensure the basic properties of steel by adding an appropriate amount of element C. The element C is harmful to the magnetism of the steel, namely, the hysteresis loss is increased, and the magnetic induction is reduced; however, the addition of a small amount of C element can improve the strength of the steel material, and can ensure that the magnetic shield steel sheet has a certain strength at a large thickness, thereby realizing a supporting function. Therefore, in the steel sheet for magnetic shielding according to the present invention, the mass percentage of the C element is controlled to be 0.06 to 0.15% in consideration of the influence of the C element on the overall magnetic properties and strength of the material.
Si: in the steel plate for magnetic shielding, the resistivity of the steel can be effectively improved by adding a proper amount of Si element, so that the eddy current loss and the iron loss are reduced; however, it should be noted that the Si element content in the steel is not too high, and too high Si content not only causes an increase in brittleness of the steel but also reduces the magnetic induction strength. Based on this, in the steel sheet for magnetic shielding according to the present invention, the mass percentage of Si element is controlled to be 2.40 to 2.90%.
Mn: in the steel plate for magnetic shielding, mn element can play a role of solid solution strengthening, and the strength of the steel plate can be effectively improved by adding a proper amount of Mn element into the steel. In addition, mn element can be combined with S element to form MnS particles, and the dispersed MnS particles can form Zener pinning force to promote secondary recrystallization. Based on this, in order to sufficiently exert the advantageous effect of the Mn element, in the steel sheet for magnetic shielding according to the present invention, the mass percentage of the Mn element is controlled to be 0.30 to 0.80%.
Cr: in the steel plate for magnetic shielding, the adverse degree of Cr element on the magnetic performance of the steel is moderate, and a small amount of Cr element is added into the steel to play a role in solid solution strengthening, so that the strength of the steel plate is effectively improved. Based on this, in the steel sheet for magnetic shielding according to the present invention, the mass percentage of the Cr element is controlled as follows: cr is less than or equal to 0.15 percent.
B: in the steel plate for magnetic shielding, the influence of trace B elements on the magnetic performance of the steel is very limited, but the B elements can effectively improve the hardenability, and the addition of a proper amount of B elements can ensure that the thick steel plate can obtain the required strength. Based on this, in the steel sheet for magnetic shielding according to the present invention, the mass percentage of the control B element is: b is less than or equal to 0.0008 percent.
In the present invention, the Cr element and the B element, that is, the Cr and B elements, are residual elements introduced in the steelmaking process, need not be added in some embodiments. According to the technical scheme, the steel can obtain the expected mechanical property and electromagnetic property by strictly controlling the C element, the Si element and the Mn element in the steel.
Further, in the steel sheet for magnetic shielding according to the present invention, among the unavoidable impurities, P.ltoreq.0.012% and/or S.ltoreq.0.005%.
In the present invention, P and S are both unavoidable impurity elements, and their contents are strictly controlled, so that the lower the content of the impurity element in the steel is, the better the technical conditions allow, in order to ensure the quality of the steel sheet for magnetic shielding.
P: in the invention, the P element can improve the resistivity of the steel plate, promote the growth of crystal grains and is beneficial to reducing the iron loss. However, the P element has a great influence on cold shortness of steel, and is more remarkable in large parts made of thick steel plates. Overall, the negative effect of the P element is greater than the positive effect, and therefore, it is necessary to strictly control the content of the harmful element P and control the impurity element P to satisfy: p is less than or equal to 0.012 percent
S: in the present invention, the S element is also an element detrimental to the magnetic properties of steel, which is disadvantageous in reducing hysteresis loss. Thus, it is necessary to strictly control the impurity element S to satisfy: s is less than or equal to 0.005 percent.
Further, in the steel sheet for magnetic shielding according to the present invention, the microstructure thereof includes ferrite, and the volume fraction of ferrite exceeds 95%.
Further, in the steel sheet for magnetic shielding according to the present invention, the microstructure is ferrite+pearlite.
Further, in the steel sheet for magnetic shielding according to the present invention, the thickness is not more than 70mm.
Further, in the steel sheet for magnetic shielding according to the present invention, the relative permeability is more than 430 and the resistivity is more than 44 μΩ·cm; iron loss P at maximum magnetic flux density of 1.6T and frequency of 60Hz 16/60 Less than 80W/kg.
Further, in the steel sheet for magnetic shielding according to the present invention, the yield strength is more than 330MPa, the tensile strength is more than 530MPa, and the elongation is more than 25%.
Accordingly, another object of the present invention is to provide a method for manufacturing a magnetic shielding steel sheet, which is simple and feasible in process, and which is excellent in the comprehensive performance, has not only high strength and high plasticity, but also high magnetic permeability, high resistivity and low iron loss, and has very good popularization prospect and application value.
In order to achieve the above object, the present invention provides a method for producing the magnetic shield steel sheet, comprising the steps of:
(1) Smelting and casting to obtain a continuous casting blank or a die-cast steel ingot;
(2) Heating;
(3) Rolling;
(4) And (3) heat treatment: firstly, normalizing at 850-950 ℃ for 0.5-8 hours; then cooling the steel plate to below 200 ℃ in air; and tempering, wherein the tempering temperature is 700-800 ℃, and the heat preservation is carried out for 1-20h.
In the technical scheme, the inventor can easily smelt steel in the smelting process of the step (1) through simple and effective chemical element composition design, and the cast continuous casting blank or the die-cast steel ingot can be rolled and formed by a wide and thick plate rolling mill after being further heated; after rolling, the steel plate obtained by rolling is subjected to a heat treatment process of normalizing and tempering, so that the mechanical property and the electromagnetic property of the steel plate are ensured.
In the present invention, the heat treatment process adopted in the step (4) is as follows: normalizing and tempering heat treatment, wherein the normalizing treatment is firstly carried out, the rolled steel plate is controlled to be reheated at the normalizing temperature of 850-950 ℃ and kept for 0.5-8 hours, so that the internal temperature and the external temperature of the steel plate are fully consistent; then cooling the steel plate to below 200 ℃ in air; after air cooling, the steel plate is tempered to regulate the final performance of the steel plate, the tempering temperature is controlled to 700-800 ℃, and the temperature is kept for 1-20 hours to reduce the stress for a long time enough to form a stable structure.
Further, in the manufacturing method according to the present invention, in the step (2), the continuous casting slab or the ingot is heated to 1100 to 1250 ℃ to homogenize the austenite structure.
In the above technical solution, it is preferable to heat the continuous casting slab or ingot to 1100-1250 ℃ to homogenize the austenitic structure so as to sufficiently dissolve the carbide in the steel. The lower limit of the heating temperature is controlled to ensure completion of rolling at a predetermined temperature in consideration of temperature drop of a slab or an ingot during rolling.
Further, in the manufacturing method according to the present invention, in the step (3), the compression ratio is controlled to be larger than 3 at the time of rolling: 1, controlling the finishing temperature to be more than or equal to 850 ℃.
Compared with the prior art, the steel plate for magnetic shielding and the manufacturing method thereof have the following advantages and beneficial effects:
(1) The design of the chemical element components of the steel plate for magnetic shielding is easy to implement, and the steel plate can play a role in strengthening by adopting a simple and reasonable alloying design, and can obtain the required high resistivity, low iron loss and high magnetic conductivity. In the invention, the resistivity can be effectively increased by controlling the contents of Si element and other alloy elements at reasonable level, thereby reducing the iron loss of the material, but simultaneously, the magnetic conductivity is not obviously reduced, and the reasonable matching of electromagnetic performance is achieved.
(2) The electromagnetic properties of steel are closely related to alloying elements and microstructure contained in steel, and another measure adopted by the invention is to realize the microstructure design of coarse ferrite in a large thickness range of the steel plate for magnetic shielding. In the composition range designed by the invention, a heat treatment process of normalizing and tempering is adopted, and more than 95% of coarse ferrite structure can be formed in a large steel plate thickness range, so that the steel is easy to magnetize under the action of an externally applied magnetic field, and the steel can obtain higher magnetic permeability.
(3) According to the invention, through reasonable matching of various alloy elements and heat treatment processes, the magnetic shielding steel plate with various thicknesses can obtain required performances, the yield strength is more than 330MPa, the tensile strength is more than 530MPa, and the elongation rate is more than 25%. More importantly, the relative permeability of the steel plate for magnetic shielding is more than 430, the resistivity exceeds 44 mu omega cm, and the iron loss P of the steel plate is at the maximum magnetic flux density of 1.6T and the frequency of 60Hz 16/60 The thickness of the steel plate with the electromagnetic performance is up to 70mm at most, which is smaller than 80W/kg.
From the above, it can be seen that the magnetic shielding steel plate provided by the invention can be obtained by adopting reasonable chemical element composition design and matching with optimized manufacturing process. The steel plate for magnetic shielding has the characteristics of high strength, good plasticity, high magnetic conductivity, high resistivity and low iron loss.
The steel plate for magnetic shielding can be used for effectively preparing products such as a rotor pressing ring and a stator pressing ring of a large-sized generator, is effectively applied to the large-sized generator, plays a role of magnetic shielding, and improves power generation efficiency.
Drawings
Fig. 1 is a photograph of a metallographic structure of a magnetic shielding steel sheet of example 1 under a microscope.
Detailed Description
The magnetic shield steel sheet and the method of manufacturing the same according to the present invention will be further explained and illustrated with reference to specific examples, but the explanation and illustration are not meant to be limiting.
Examples 1 to 6
The magnetic shield steel sheets of examples 1 to 6 were each produced by the following steps:
(1) Smelting according to the chemical composition ratio shown in Table 1, then refining outside the furnace by adopting a vacuum degassing method, and casting after refining is finished to obtain a continuous casting blank or a die-cast steel ingot.
(2) Heating: heating the obtained continuous casting blank or die-casting ingot to 1100-1250 ℃ to homogenize the austenite structure.
(3) Rolling: rolling the heated continuous casting blank or the die-cast steel ingot, wherein the compression ratio is controlled to be more than 3 during rolling: 1, controlling the finishing temperature to be more than or equal to 850 ℃.
(4) And (3) heat treatment: normalizing the rolled plate, controlling the normalizing temperature to 850-950 ℃ and controlling the heat preservation time to 0.5-8h; then cooling the steel plate to below 200 ℃ in air; and tempering, wherein the tempering temperature is controlled to be 700-800 ℃, and the temperature is kept for 1-20h.
It should be noted that, the magnetic shielding steel plates of the embodiments 1 to 6 of the present invention are all manufactured by the process flows of the steps (1) to (4), and the chemical components and the related process parameters thereof all meet the control requirements of the design specification of the present invention.
Table 1 shows the mass percentages of the respective chemical elements in the magnetic shield steel sheets of examples 1 to 6.
Table 1 (wt.%), the balance Fe and unavoidable impurities other than P, S
Table 2 shows specific process parameters of the magnetic shield steel sheets of examples 1 to 6 in each step of the above-mentioned production method.
Table 2.
The technical scheme can realize the technical effect of the scheme by air-cooling the steel plate to below 200 ℃ in the heat treatment step, but with the heat dissipation process, the final cooling temperature of the air cooling is generally room temperature, so the final cooling temperatures of the air cooling embodied in embodiments 1-6 are all room temperature.
The finally produced magnetic shield steel sheets of examples 1 to 6 were sampled, and the magnetic shield steel sheet samples of examples 1 to 6 were observed and analyzed, and the microstructure of the magnetic shield steel sheets of examples 1 to 6 was observed to be ferrite+pearlite.
Accordingly, further analysis was conducted on the microstructures of the magnetic shield steel sheets of examples 1 to 6 to obtain the volume fraction of ferrite in the microstructures of the steel sheets of each example, and the detection analysis results thereof are shown in the following table 3.
Table 3.
| Examples | Volume fraction of ferrite |
| Example 1 | 97.8 |
| Example 2 | 98.3 |
| Example 3 | 99.2 |
| Example 4 | 98.7 |
| Example 5 | 97.4 |
| Example 6 | 95.1 |
As can be seen from the above Table 3, in the present invention, the ferrite volume fraction of the magnetic shield steel sheets of examples 1 to 6 is not less than 95%, and specifically, is in the range of 95.1 to 99.2%.
After completing the microstructure observation of the magnetic shield steel sheets according to examples 1 to 6 of the present invention, the magnetic shield steel sheet samples according to examples 1 to 6 could be further tested for mechanical properties and electromagnetic properties at 1/4 plate thickness positions to obtain the magnetic shield steel sheets according to examples 1 to 6 at 1/4 plate thickness positions, and the test results obtained could be listed in the following table 4.
The relevant mechanical property and electromagnetic property testing means are as follows:
tensile test: the steel sheet samples for magnetic shielding of examples 1 to 6 were measured for yield strength, tensile strength and elongation at room temperature, as specified in the GB/T228.1 standard at room temperature.
Electromagnetic performance test: the relative permeability and resistivity of the steel sheet samples for magnetic shielding of examples 1 to 6, and the steel sheet samples for magnetic shielding of each example were measured at room temperature in accordance with GB/T3658 standardIron loss P of the product at maximum magnetic flux density of 1.6T and frequency of 60Hz 16/60 。
Table 4 shows the results of the mechanical properties and electromagnetic properties of the magnetic shield steel sheets of examples 1 to 6 at the 1/4 plate thickness position.
Table 4.
As can be seen from the above Table 4, the magnetic shielding steel sheets of examples 1 to 6 according to the present invention have excellent mechanical properties and electromagnetic properties, not only have high strength and plasticity, but also have the characteristics of high magnetic permeability, high resistivity and low iron loss, the yield strength is 338 to 379MPa, the tensile strength is 534 to 569MPa, the elongation is 25.5 to 36.0%, the relative magnetic permeability is 439 to 640, the electrical resistivity is 44 to 50mu.Ω cm, and the iron loss P 16/60 Between 50-75W/kg.
Fig. 1 is a photograph of a metallographic structure of a magnetic shielding steel sheet of example 1 under a microscope.
As shown in fig. 1, in example 1, the microstructure of the magnetic shield steel sheet prepared was a coarse ferrite structure plus a small amount of pearlite. Wherein, the volume fraction of ferrite is 97.8%.
From the above, it can be seen that the magnetic shielding steel plate provided by the invention can be obtained by adopting a simple alloying design and matching with an optimized manufacturing process, and has the characteristics of high strength, good plasticity, high magnetic conductivity, high resistivity and low iron loss, and the production process is simple and feasible.
The steel plate for magnetic shielding can be used for manufacturing products such as a rotor pressing ring and a stator pressing ring of a large-scale generator, plays a role of magnetic shielding, and improves power generation efficiency.
It should be noted that the prior art part in the protection scope of the present invention is not limited to the embodiments set forth in the present application, and all prior art that does not contradict the scheme of the present invention, including but not limited to the prior patent document, the prior publication, the prior disclosure, the use, etc., can be included in the protection scope of the present invention.
In addition, the combination of the features described in the present application is not limited to the combination described in the claims or the combination described in the embodiments, and all the features described in the present application may be freely combined or combined in any manner unless contradiction occurs between them.
It should also be noted that the above-mentioned embodiments are merely examples of the present invention, and it is obvious that the present invention is not limited to the above-mentioned embodiments, and many similar variations are followed. All modifications attainable or obvious from the present disclosure set forth herein should be deemed to be within the scope of the present disclosure.
Claims (11)
1. A steel plate for magnetic shielding, which contains Fe and unavoidable impurities, is characterized by further containing the following chemical elements in percentage by mass:
C：0.06～0.15％，Si：2.40～2.90％，Mn：0.30～0.80％，Cr≤0.15％，B≤0.0008％。
2. the steel sheet for magnetic shielding according to claim 1, wherein the mass percentages of the chemical elements are:
c: 0.06-0.15%, si:2.40 to 2.90 percent, mn:0.30 to 0.80 percent, cr is less than or equal to 0.15 percent, and B is less than or equal to 0.0008 percent; the balance being Fe and unavoidable impurities.
3. The steel sheet for magnetic shielding according to claim 1 or 2, wherein among the unavoidable impurities, P is 0.012% or less and/or S is 0.005% or less.
4. The steel sheet for magnetic shielding according to claim 1 or 2, wherein the microstructure thereof includes ferrite, and the volume fraction of ferrite exceeds 95%.
5. The steel sheet for magnetic shielding according to claim 4, wherein the microstructure thereof is ferrite+pearlite.
6. The steel sheet for magnetic shielding according to claim 1 or 2, wherein the thickness thereof is 70mm or less.
7. The steel sheet for magnetic shielding according to claim 1 or 2, characterized in that it has a relative magnetic permeability of more than 430 and an electrical resistivity of more than 44 μΩ -cm; iron loss P at maximum magnetic flux density of 1.6T and frequency of 60Hz 16/60 Less than 80W/kg.
8. The steel sheet for magnetic shielding according to claim 7, wherein the yield strength is more than 330MPa, the tensile strength is more than 530MPa, and the elongation is more than 25%.
9. A method for manufacturing a steel sheet for magnetic shielding according to any one of claims 1 to 8, comprising the steps of:
(1) Smelting and casting to obtain a continuous casting blank or a die-cast steel ingot;
(2) Heating;
(3) Rolling;
(4) And (3) heat treatment: firstly, normalizing at 850-950 ℃ for 0.5-8 hours; then cooling the steel plate to below 200 ℃ in air; and tempering, wherein the tempering temperature is 700-800 ℃, and the heat preservation is carried out for 1-20h.
10. The method of claim 9, wherein in step (2), the continuous casting slab is heated to 1100 to 1250 ℃ to homogenize the austenite structure.
11. The manufacturing method according to claim 9, wherein in the step (3), the compression ratio is controlled to be larger than 3 at the time of rolling: 1, controlling the finishing temperature to be more than or equal to 850 ℃.
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| JP2001107147A (en) * | 1999-10-12 | 2001-04-17 | Kawasaki Steel Corp | Method for producing grain-oriented silicons steel sheet |
| JP2005060784A (en) * | 2003-08-15 | 2005-03-10 | Jfe Steel Kk | Steel sheet for internal magnetic shielding and its manufacturing method |
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