CN111349861A - High-magnetic-induction non-oriented silicon steel for EI sheets in CSP process and production method thereof - Google Patents
High-magnetic-induction non-oriented silicon steel for EI sheets in CSP process and production method thereof Download PDFInfo
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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
- 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
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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
- C21D8/12—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
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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
- C21D8/12—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
- C21D8/1272—Final recrystallisation annealing
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- 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%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Abstract
The invention discloses high-magnetic-induction non-oriented silicon steel for EI sheets in a CSP process and a production method thereof, belonging to the technical field of smelting. The provided method comprises the following procedures: smelting molten steel, continuous casting, heating, hot rolling, acid continuous rolling and continuous annealing; the method can stably produce the high-magnetic-induction non-oriented silicon steel B for EI sheets in batches by a CSP process through proper components and process design50Reaching more than 1.77T, P15/50The control is within 5.0W/kg, and the finished product has the advantages of high magnetic induction and low iron loss, and completely meets the product performance requirements of the non-oriented silicon steel for EI sheets.
Description
Technical Field
The invention belongs to the technical field of smelting, and particularly relates to high-magnetic-induction non-oriented silicon steel for EI sheets in CSP (cast Steel plate) process and a production method thereof.
Background
The non-oriented silicon steel is used as an important soft magnetic material and is mainly used for manufacturing motor iron cores and microwave oven transformers, and the yield of the non-oriented silicon steel accounts for 80-90% of the yield of electrical steel in China. At present, energy conservation and consumption reduction become the hot problems highly emphasized by the government of China, and cost reduction and efficiency improvement become the continuous pursuits of various large enterprises. Therefore, the method for producing the special high-magnetic-induction non-oriented silicon steel for the EI sheets by the CSP process not only reduces the production cost and improves the production efficiency, but also can save energy and reduce consumption to the greatest extent and reduce the using amount of the non-oriented silicon steel.
Document CN 109252102a discloses a method for improving the magnetic performance of low-silicon non-oriented silicon steel, and provides a method for manufacturing high-magnetic-induction non-oriented silicon steel, and the non-oriented silicon steel produced by the method has high magnetic induction and low iron loss. However, the method adopts a conventional hot rolling process instead of a CSP process, and alloys such as Sb and the like need to be additionally added, and a hot rolling cover type annealing process needs to be added in the process, so that higher manufacturing cost is increased.
Document CN 106048390a discloses a method for producing non-oriented electrical steel 50w800 by thin slab continuous casting and rolling, and provides a method for manufacturing non-oriented silicon steel by a CSP process. However, the non-oriented silicon steel B produced by the method50≥1.74T，P15/50The method is less than or equal to 5.6W/kg, the performance requirement of EI sheets on the high magnetic induction of the non-oriented silicon steel cannot be met, and the method needs to perform decarburization treatment in a continuous annealing stage, so that the service life of the continuous annealing furnace is influenced to a certain extent.
Document CN 110106447A discloses a high magnetic induction non-oriented electrical steel and a preparation method thereof, and provides a manufacturing method of non-oriented silicon steel, and the non-oriented silicon steel B produced by the method5000≥1.67T、P1.0/400The non-oriented silicon steel is less than or equal to 11W/kg, but the non-oriented silicon steel is suitable for a high-speed motor, and the method adopts a conventional hot rolling process instead of a CSP process, needs to additionally increase a normalizing process, has higher production cost, and has more iron loss allowance and insufficient magnetic induction compared with the performance requirement of the non-oriented silicon steel for EI sheets.
Disclosure of Invention
In view of one or more of the problems in the prior art, an aspect of the present invention provides a method for producing a high magnetic induction non-oriented silicon steel for a CSP process EI sheet, comprising the steps of: smelting molten steel, continuous casting, heating, hot rolling, acid continuous rolling and continuous annealing;
wherein:
the molten steel smelting process comprises the following steps of smelting according to the following components in percentage by mass: c: less than or equal to 0.005%, Si: 0.1 to 1.5%, Mn: 0.1-0.85%, Al: 0.1-0.8%, P: less than or equal to 0.15 percent, S: less than or equal to 0.003 percent, O: less than or equal to 0.003 percent, N: less than or equal to 0.003 percent, Ti: less than or equal to 0.003 percent, and the balance of Fe and inevitable impurities;
the continuous casting process is to continuously cast the smelted molten steel into a continuous casting billet with the thickness of 50-65 mm; the horizontal drawing speed is required to be controlled to be 3.8-4.3 m/min; and adopts special covering slag for silicon steel and carbon-free tundish covering agent;
in the heating procedure, the continuous casting blank is heated to 1020-1060 ℃, and the heat preservation time is 28-35 min;
the hot rolling process adopts controlled rolling, the rolling temperature is 1015-1055 ℃, F1 and F2 require over 40 percent of large reduction rate, and the final pass is 10-25 percent of reduction rate; the final rolling temperature is 870 +/-10 ℃, the coiling temperature is 740 +/-10 ℃, hot rolled coils with the thickness of 2.1mm-2.5mm are obtained, and natural air cooling is carried out after rolling is finished;
in the acid continuous rolling procedure, each pass adopts a large reduction rate of 20-40%, and the last pass is less than 10% to obtain a cold-rolled sheet with the thickness of 0.5 mm;
in the continuous annealing procedure, the cold-rolled sheet is processed in N2+10％H2Carrying out continuous annealing treatment in a protective atmosphere at the annealing temperature of 830 +/-5 ℃ for 0.5-1.5min, then circularly spraying gas and cooling to 110-130 ℃, discharging, and finally coating an insulating film.
The magnetic performance of the high-magnetic-induction non-oriented silicon steel for the EI sheets in the CSP process is as follows: b is50＝1.779～1.794T，P15/50≤4.9W/Kg。
The invention also provides high-magnetic-induction non-oriented silicon steel for the EI sheets in the CSP process, which is produced by the method.
The production method of the high-magnetic-induction non-oriented silicon steel for the EI sheet in the CSP process, which is provided based on the technical scheme, can ensure that the magnetic induction is higher on the premise of ensuring that the iron loss meets the requirements through reasonable component design. The heating temperature is controlled according to the solid solution temperature of Al, N, Mn, and S, and the ingot is required to be heated at a low temperature, so that precipitates such as Al, N, Mn, and S in steel grades can be prevented from being dissolved in a solid solution, and the improvement of the magnetic induction is facilitated. The hot rolling F1 and F2 require high reduction rate for rolling, which is beneficial to crushing columnar crystals at the center of a casting blank, the subsequent pass is gradually reduced, the final pass is 10-25%, which is beneficial to controlling the hot rolling plate shape and uniform recrystallization grains, and the final rolling temperature is lower than Ar3The phase transformation point, hot rolling is carried out in a two-phase region, the finish rolling temperature and the coiling temperature are high, the subsequent hot rolled plate is not normalized, the crystal grains of the hot rolled plate are still large, and the magnetism of a finished product is improved. The high acid rolling total reduction rate is beneficial to accumulating the tissue recovery recrystallization energy in the subsequent annealing, is beneficial to improving the texture and improving the magnetism, and the reduction rate of the last pass is less than 10 percent, so that the good plate shape is guaranteed. The annealing eliminates strain generated by cold rolling through recrystallization and promotes the crystal grains to grow, the crystal grains can be thicker by quickly raising the annealing temperature to the target annealing temperature, the texture is favorably improved, the magnetism is improved, and the small-tension annealing can ensure that the plate shape is smoother. The magnetic performance of the obtained high-magnetic-induction non-oriented silicon steel for the CSP EI sheet is as follows: b is50＝1.779～1.794T，P15/50The product performance completely meets the requirements of non-oriented silicon steel for EI sheets, has the advantages of high magnetic induction and low iron loss, and has the advantages of good plate shape, simple process route, low manufacturing cost and stable batch production.
Detailed Description
The high magnetic induction non-oriented silicon steel for the EI sheets in the CSP process and the production method thereof are further described in detail by combining specific examples.
The model of the equipment adopted for metallographic structure observation in the embodiment of the invention is Carl Zeiss observer.D1m.
The equipment model adopted for detecting the magnetic performance in the embodiment of the invention is NIM-2000SE and SST-500EC of China metering technology development general company.
Example 1: production method of high-magnetic-induction non-oriented silicon steel for CSP (chip scale packaging) process EI (El) sheet
Smelting molten steel: smelting molten steel according to set chemical components, wherein the molten steel comprises the following components in percentage by mass: 0.0018%, Si: 0.24%, Mn: 0.26%, Al: 0.333%, P: 0.080%, S: 0.002%, O: 0.0022%, N: 0.0025%, Ti: 0.0020% and the balance of Fe and inevitable impurities.
Continuous casting: and (3) preparing the molten steel into a continuous casting billet with the thickness of 57mm by a continuous casting machine, wherein the transverse drawing speed is 4.2 m/min.
Heating: heating the continuous casting slab to 1050 ℃, and preserving heat for 30 min.
Hot rolling: hot rolling by a 7-frame continuous rolling mill, wherein the screw-down rates of F1-F7 are 41%, 49%, 43%, 36%, 32%, 30% and 23% respectively, the initial rolling temperature is 1045 ℃, the final rolling temperature is 880 ℃, the coiling temperature is 740 ℃, and after coiling, stacking air cooling is carried out to the room temperature, thus obtaining the 2.3mm hot rolled coil.
Acid rolling: the hot rolled coil is pickled and continuously rolled by a 5-frame six-roller rolling mill, the rolling reduction rates of S1-S5 are respectively 28.3%, 34.5%, 31.4%, 27.6% and 7.5%, and the outlet rolling speed is 550m/min, so that a 0.5mm cold-rolled plate is prepared.
And (3) continuous annealing: annealing the cold-rolled sheet in a horizontal continuous annealing furnace under the protective atmosphere of N2+10％H2And the annealing temperature is 830 ℃, the silicon steel is discharged after being circularly cooled to below 120 ℃, and an insulating film is coated to obtain the non-oriented silicon steel plate. The magnetic performance of the finished product is as follows: b is50＝1.794T，P15/50＝4.775W/kg。
Example 2: production method of high-magnetic-induction non-oriented silicon steel for CSP (chip scale packaging) process EI (El) sheet
Smelting molten steel: smelting molten steel according to set chemical components, wherein the molten steel comprises the following components in percentage by mass: 0.0017%, Si: 0.22%, Mn: 0.28%, Al: 0.341%, P: 0.091%, S: 0.002%, O: 0.0021%, N: 0.0020%, Ti: 0.0016%, and the balance of Fe and inevitable impurities.
Continuous casting: and (3) preparing the molten steel into a continuous casting billet with the thickness of 57mm by a continuous casting machine, wherein the transverse drawing speed is 4.2 m/min.
Heating: heating the continuous casting slab to 1040 ℃, and preserving heat for 30 min.
Hot rolling: hot rolling by a 7-stand continuous rolling mill, wherein the screw-down rates of F1-F7 are respectively 49%, 42%, 36%, 35%, 24% and 15%, the initial rolling temperature is 1035 ℃, the final rolling temperature is 880 ℃, the coiling temperature is 745 ℃, and after coiling, stacking air cooling is carried out to the room temperature, so as to obtain the 2.3mm hot rolled coil.
Acid rolling: the hot rolled coil is subjected to acid cleaning and continuous rolling by a 5-frame six-roller rolling mill, the rolling reduction rates of S1-S5 are respectively 31.3%, 30.2%, 28.4%, 26.7% and 13.9%, and the outlet rolling speed is 550m/min, so that a 0.5mm cold-rolled plate is manufactured.
And (3) continuous annealing: annealing the cold-rolled sheet in a horizontal continuous annealing furnace under the protective atmosphere of N2+10％H2And annealing at 840 ℃, circularly cooling to below 120 ℃, discharging, and coating an insulating film to obtain the non-oriented silicon steel plate. The magnetic performance of the finished product is as follows: b is50＝1.779T，P15/50＝4.827W/kg。
Example 3: production method of high-magnetic-induction non-oriented silicon steel for CSP (chip scale packaging) process EI (El) sheet
Smelting molten steel: smelting molten steel according to set chemical components, wherein the molten steel comprises the following components in percentage by mass: 0.0018%, Si: 0.22%, Mn: 0.29%, Al: 0.328%, P: 0.086%, S: 0.0025%, O: 0.0028%, N: 0.0022%, Ti: 0.0010%, and the balance of Fe and inevitable impurities.
Continuous casting: and (3) preparing the molten steel into a continuous casting billet with the thickness of 57mm by a continuous casting machine, wherein the transverse drawing speed is 4.2 m/min.
Heating: heating the continuous casting slab to 1030 ℃ and preserving heat for 30 min.
Hot rolling: hot rolling by a 7-frame continuous rolling mill, wherein the screw-down rates of F1-F7 are 55%, 38%, 33%, 30%, 23% and 11%, respectively, the initial rolling temperature is 1025 ℃, the final rolling temperature is 890 ℃, the coiling temperature is 750 ℃, and stacking air cooling is carried out to the room temperature after coiling to obtain a 2.3mm hot rolled coil.
Acid rolling: the hot rolled coil is acid-washed and continuously rolled by a six-roller rolling mill with 5 stands, the rolling reduction rates of S1-S5 are respectively 30.7%, 30.6%, 30.3%, 28.6% and 9.9%, and the outlet rolling speed is 550m/min, so that a 0.5mm cold-rolled plate is manufactured.
And (3) continuous annealing: annealing the cold-rolled sheet in a horizontal continuous annealing furnace under the protective atmosphere of N2+10％H2And the annealing temperature is 850 ℃, the silicon steel is discharged after being circularly cooled to below 120 ℃, and an insulating film is coated to obtain the non-oriented silicon steel plate. The magnetic performance of the finished product is as follows: b is50＝1.790T，P15/50＝4.772W/kg。
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A production method of high magnetic induction non-oriented silicon steel for a CSP (chip scale packaging) process EI sheet is characterized by comprising the following steps: smelting molten steel, continuous casting, heating, hot rolling, acid continuous rolling and continuous annealing;
wherein:
the molten steel smelting process comprises the following steps of smelting according to the following components in percentage by mass: c: less than or equal to 0.005%, Si: 0.1 to 1.5%, Mn: 0.1-0.85%, Al: 0.1-0.8%, P: less than or equal to 0.15 percent, S: less than or equal to 0.003 percent, O: less than or equal to 0.003 percent, N: less than or equal to 0.003 percent, Ti: less than or equal to 0.003 percent, and the balance of Fe and inevitable impurities;
the continuous casting process is to continuously cast the smelted molten steel into a continuous casting billet with the thickness of 50-65 mm; the horizontal drawing speed is required to be controlled to be 3.8-4.3 m/min; and adopts special covering slag for silicon steel and carbon-free tundish covering agent;
in the heating procedure, the continuous casting blank is heated to 1020-1060 ℃, and the heat preservation time is 28-35 min;
the hot rolling process adopts controlled rolling, the rolling temperature is 1015-1055 ℃, and F1 and F2 require a large reduction rate of more than 40%; the final rolling temperature is 870 +/-10 ℃, the coiling temperature is 740 +/-10 ℃, hot rolled coils with the thickness of 2.1mm-2.5mm are obtained, and natural air cooling is carried out after rolling is finished;
in the acid continuous rolling procedure, each pass adopts a large reduction rate of 20-40%, and the last pass is less than 10% to obtain a cold-rolled sheet with the thickness of 0.5 mm;
in the continuous annealing procedure, the cold-rolled sheet is processed in N2+10％H2Carrying out continuous annealing treatment in a protective atmosphere at the annealing temperature of 830 +/-5 ℃ for 0.5-1.5min, then circularly spraying gas and cooling to 110-130 ℃, discharging, and finally coating an insulating film.
2. The method for producing the high-magnetic-induction non-oriented silicon steel for the EI sheets in the CSP process as claimed in claim 1, wherein the high-magnetic-induction non-oriented silicon steel for the EI sheets in the CSP process has the following magnetic properties: b is50＝1.779～1.794T，P15/50≤4.9W/Kg。
3. A high magnetic induction non-oriented silicon steel for EI sheets in CSP process, which is produced by the method of claim 1 or 2.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906577A (en) * | 2010-07-16 | 2010-12-08 | 武汉钢铁(集团)公司 | Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof |
| CN103205547A (en) * | 2013-04-11 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Method for preparing batch annealing low-grade non-oriented electrical steel |
| CN108486453A (en) * | 2018-03-27 | 2018-09-04 | 东北大学 | A kind of preparation method of low-iron loss high-magnetic strength non-oriented silicon steel plate |
| JP2020033640A (en) * | 2018-08-23 | 2020-03-05 | Ｊｆｅスチール株式会社 | Production method of non-oriented electromagnetic steel sheet |
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- 2020-03-24 CN CN202010214531.6A patent/CN111349861A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906577A (en) * | 2010-07-16 | 2010-12-08 | 武汉钢铁(集团)公司 | Non-oriented electrical steel produced by sheet continuous casting and rolling and method thereof |
| CN103205547A (en) * | 2013-04-11 | 2013-07-17 | 内蒙古包钢钢联股份有限公司 | Method for preparing batch annealing low-grade non-oriented electrical steel |
| CN108486453A (en) * | 2018-03-27 | 2018-09-04 | 东北大学 | A kind of preparation method of low-iron loss high-magnetic strength non-oriented silicon steel plate |
| JP2020033640A (en) * | 2018-08-23 | 2020-03-05 | Ｊｆｅスチール株式会社 | Production method of non-oriented electromagnetic steel sheet |
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