CN111560554A - Preparation method of rare earth non-oriented silicon steel - Google Patents
Preparation method of rare earth non-oriented silicon steel Download PDFInfo
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 40
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 29
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000000034 method Methods 0.000 claims abstract description 39
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 238000005098 hot rolling Methods 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 239000002253 acid Substances 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 10
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 7
- 230000023556 desulfurization Effects 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 238000007670 refining Methods 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 7
- 239000000047 product Substances 0.000 description 16
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 description 5
- 230000006698 induction Effects 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 4
- 239000011572 manganese Substances 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 238000005261 decarburization Methods 0.000 description 3
- 238000005097 cold rolling Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- 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
- 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
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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Abstract
The invention discloses a preparation method of rare earth non-oriented silicon steel, which comprises the following steps: iron making → KR desulfurization → converter → RH refining → continuous casting → heating → hot rolling → layer cooling → coiling → acid rolling → annealing → coating → dry sintering, wherein the chemical composition of the hot rolling raw material is as followsThe mass percentage satisfies: c is less than or equal to 0.004%, Si: 0.5-2.0%, Mn: 0.3-1.0%, Al: 0.3-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.004%, N is less than or equal to 0.005%, O is less than or equal to 0.008%, and rare earth Ce: 0.0010-0.0090%, and the balance of Fe and inevitable impurities. The rare earth non-oriented silicon steel obtained by the method has the magnetic property of P1.5/50＝2.8～3.1W/kg，B5000/501.68-1.72T, good performance and low production cost.
Description
Technical Field
The invention belongs to the technical field of non-oriented silicon steel preparation, particularly relates to a preparation method of rare earth non-oriented silicon steel, and particularly relates to a preparation method of high-performance rare earth non-oriented silicon steel.
Background
Silicon steel is an important soft magnetic alloy indispensable to the power, electronic and military industries, and is mainly used as iron cores of various motors, generators and transformers. The production process is complex, the manufacturing technology is strict, and the product is regarded as the life of an enterprise. The middle and high grade non-oriented silicon steel belongs to high-end products, and is mainly used in the fields of automobiles, household appliances and the like. The production of the non-oriented silicon steel with high performance and low cost has high requirements, strict process requirements and complex process flow.
Document CN101358272A discloses a method for preparing high-grade non-oriented electrical steel added with rare earth cerium. The document uses a non-oriented electrical steel casting blank with high Si and rare earth Ce as a hot rolling raw material, and the high-grade non-oriented electrical steel product with excellent magnetism is obtained by hot rolling, normalizing, acid washing, cold rolling, annealing and coating, and has the following component design ranges: c is less than or equal to 0.005%, Si: 2.4 to 3.3 percentAnd Mn: 0.1-0.6%, Al: 0.8-1.5%, P is less than or equal to 0.02%, S is less than or equal to 0.003-0.006%, N is less than or equal to 0.008%, O is less than or equal to 0.015%, rare earth Ce: 0.0015-0.030%, and the magnetic property of the finished product is P1.5/50＝2.21～2.54W/kg，B5000/501.70-1.72T. The iron loss control of the document is low, the document mainly aims at high grades, a normalizing process is needed, and meanwhile, the Si content is high and the cost is high.
Document CN102345001A discloses a method for preparing rare earth treated low-grade non-oriented electrical steel. The method comprises the steps of producing a hot rolling raw material by a CSP process through acid rolling, annealing and coating to obtain a finished product with an iron loss range and a magnetic property of P1.5/50＝3.45～5.02W/kg，B5000/501.67-1.75T. The document mainly aims at low grade and can only be used as a general motor iron core material.
Document CN1796015A discloses a method for producing cold-rolled non-oriented electrical steel by continuous casting and rolling of thin slabs, in which example 3 is added Si: 2.10% and Al: 0.3%, and the like. Iron loss P1.5/50The minimum can only reach 2.9-3.2W/kg.
Disclosure of Invention
Aiming at one or more problems in the prior art, the invention provides a preparation method of rare earth non-oriented silicon steel, which comprises the following steps: iron making → KR desulfurization → converter → RH refining → continuous casting → heating → hot rolling → layer cooling → coiling → acid rolling → annealing → coating → dry sintering, wherein the chemical composition of the hot rolling raw material of the rare earth non-oriented silicon steel satisfies the following requirements in mass percent: c is less than or equal to 0.004%, Si: 0.5-2.0%, Mn: 0.3-1.0%, Al: 0.3-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.004%, N is less than or equal to 0.005%, O is less than or equal to 0.008%, and rare earth Ce: 0.0010-0.0090%, and the balance of Fe and inevitable impurities;
after the molten iron is subjected to KR desulfurization treatment, the sulfur content of the molten iron fed into the converter is less than or equal to 0.002%, the tapping temperature of the converter is higher than 1680 ℃, and the tapping temperature drop requirement is lower than 70 ℃;
in the continuous casting process, the casting machine is controlled at a constant drawing speed, and the drawing speed is 0.8-1.2 m/min;
in the heating procedure, the temperature of a heating furnace is 1100-1300 ℃, and the heating time is 1-6 h;
the hot rolling process adopts a 2250mm rolling mill, the initial rolling temperature of the hot rolling is 950-1150 ℃, the final rolling temperature is 800-1000 ℃, the thickness of the hot rolled plate is 1.8-2.8 mm, then the acid rolling is carried out, the thickness after the acid rolling is 0.5mm, the annealing temperature is 900-1050 ℃, and the annealing time is 60-180 s;
the drying and sintering process is to perform drying and sintering at 300-500 ℃.
The rare earth non-oriented silicon steel prepared by the method also belongs to the content of the invention, the grain size range of the obtained rare earth non-oriented silicon steel is 60-110 mu m, and the magnetic property is P1.5/50＝2.8～3.1W/kg，B5000/50＝1.68～1.72T。
According to the preparation method of the rare earth non-oriented silicon steel provided by the technical scheme, under the condition of common design components, the grain size of the obtained finished product is obviously improved, the magnetic performance is improved by adding the rare earth elements and then influencing the size and distribution of precipitates, and the high-performance non-oriented silicon steel can be produced. Compared with the method provided by the document CN101358272A, the method provided by the invention does not need a normalizing treatment process, and the component design of the invention adopts lower content of Si, so that the cost is greatly reduced, and the obtained non-oriented silicon steel has higher magnetic induction and lower iron loss, which are superior to the magnetic induction and iron loss of the non-oriented silicon steel obtained by the method in the prior art on the premise of designing the same components. Compared with the method provided by the document CN102345001A, the steelmaking and hot rolling process provided by the invention adopts a 2250mm rolling mill for production, the performance is uniform, the plate shape and the same plate difference are better controlled, and the magnetic performance of the obtained rare earth non-oriented silicon steel is obviously superior to that of the silicon steel prepared by the document; compared with the method provided by the document CN1796015A, the method has low Si content, can reduce the cost, adopts 2250mm rolling mill for steel making and hot rolling, adopts acid continuous rolling for cold rolling, has short production flow, fast pace and short time consumption, and the obtained silicon steel has better magnetic performance.
Drawings
FIG. 1 is a metallographic structure photograph of the silicon steel obtained in example 1;
FIG. 2 is a metallographic structure photograph of silicon steel obtained by comparative example.
Detailed Description
The invention aims to provide a preparation method of high-performance rare earth non-oriented silicon steel, which has good magnetic performance and reduced cost. The provided method specifically comprises the following steps: iron making → KR desulfurization → converter → RH refining → continuous casting → heating → hot rolling → layer cooling → coiling → acid rolling → annealing → coating → dry sintering → online detection → coil slitting and trimming → packaging and delivery.
Wherein the molten iron is selected according to the requirements of chemical elements of the molten steel, and the molten iron needs to be subjected to KR desulfurization treatment, and the sulfur content of the molten iron entering a converter is required to be less than or equal to 0.002%. The tapping temperature of the converter is more than 1680 ℃, and the tapping temperature drop is required to be less than 70 ℃. The deep decarburization treatment is carried out according to the composition and temperature of the molten steel to be RH. After the decarbonization is finished, alloy such as micro-carbon ferrosilicon, metal manganese, ferrophosphorus, aluminum particles and the like is added to adjust the components. The whole continuous casting process is protected from oxidation casting, and the coating material tundish and the carbon-free tundish covering agent are used to reduce the carburetion in the casting process. The casting machine is controlled by adopting a constant drawing speed, and the drawing speed range is 0.8-1.2 m/min. The chemical components for the hot rolling raw material meet the following requirements in percentage by mass: c is less than or equal to 0.004%, Si: 0.5-2.0%, Mn: 0.3-1.0%, Al: 0.3-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.004%, N is less than or equal to 0.005%, O is less than or equal to 0.008%, and rare earth Ce: 0.0010-0.0090%, and the balance of Fe and inevitable impurities. The method comprises the steps of heating the hot-rolled steel plate at 1100-1300 ℃ in a hot-rolling heating furnace for 1-6 h, starting hot-rolling at 950-1150 ℃, finishing at 800-1000 ℃, rolling the hot-rolled steel plate to 1.8-2.8 mm in thickness, performing acid continuous rolling at 900-1050 ℃ in thickness after acid continuous rolling, annealing the cold-rolled steel plate for 60-180 s, and drying and sintering the cold-rolled steel plate at 300-500 ℃ after annealing without humidification and decarburization. The grain size of the finished product ranges from 60 to 110 mu m.
The present invention will be described in detail below by way of examples, which are merely illustrative of the best mode for carrying out the present invention and do not limit the present invention in any way.
The chemical composition contents of each example are shown in Table 1.
Table 1: chemical composition (wt%) of Hot Rolling stock of each example and comparative example
| Examples | C | Si | Mn | P | S | Alt | N | O | Ce |
| Comparative example | 0.003 | 1.82 | 0.68 | 0.065 | 0.003 | 0.65 | 0.0020 | 0.005 | - |
| Example 1 | 0.002 | 1.86 | 0.70 | 0.063 | 0.003 | 0.67 | 0.0019 | 0.006 | 0.0026 |
| Example 2 | 0.003 | 1.83 | 0.69 | 0.065 | 0.003 | 0.70 | 0.0018 | 0.005 | 0.0054 |
| Example 3 | 0.003 | 1.87 | 0.70 | 0.070 | 0.003 | 0.68 | 0.0025 | 0.007 | 0.0087 |
According to the chemical components in the table 1, the high-performance rare earth non-oriented silicon steel is prepared by adopting the following procedures: the casting machine is controlled by adopting a constant drawing speed, and the drawing speed range is 0.8-1.2 m/min. The method comprises the steps of heating the hot-rolled steel plate at 1100-1300 ℃ in a hot-rolling heating furnace for 1-6 h, starting hot-rolling at 950-1150 ℃, finishing at 800-1000 ℃, rolling the hot-rolled steel plate to 1.8-2.8 mm in thickness, performing acid continuous rolling at 900-1050 ℃ in thickness after acid continuous rolling, annealing the cold-rolled steel plate for 60-180 s, and drying and sintering the cold-rolled steel plate at 300-500 ℃ after annealing without humidification and decarburization. The magnetic properties of the finished product are shown in Table 2.
Table 2: magnetic energy range of the finished product
| Examples | Iron loss P1.5/50(w/kg) | Magnetic induction B5000/50(T) |
| Comparative example | 3.124 | 1.693 |
| Example 1 | 3.030 | 1.687 |
| Example 2 | 2.985 | 1.702 |
| Example 3 | 2.969 | 1.695 |
As shown in fig. 1 and 2, the metallographic structures of the finished products obtained in example 1 and the comparative example are shown, respectively, and it can be seen from the data in table 2 above that the grain size of the silicon steel obtained in example 1 is significantly improved and the magnetic performance is improved compared to the comparative example without rare earth.
As known to those skilled in the art, silicon is one of the main alloying elements in non-oriented silicon steel, and as the content of silicon increases, the resistance value increases to reduce the eddy current loss, and the iron loss value P1.5/50Decrease of B5000/50And also reduces the content of silicon element, so that the method is one of the main methods for reducing the iron loss of the electrical steel by increasing the content of the silicon element. The method disclosed in document CN101358272A adopts a higher Si content to make the obtained non-oriented silicon steel product have magnetic property P1.5/50＝2.21～2.54W/kg，B5000/50The magnetic induction is 1.70-1.72T, and the magnetic induction and the iron loss are high. However, when the method disclosed in document CN101358272A is applied to the low Si content composition design of the present invention, the magnetic property of the finished non-oriented silicon steel obtained according to the method disclosed in document CN101358272A is P using the composition design of example 2 herein1.5/50＝3.215W/kg，B5000/50When the component design with low Si content is adopted, it can be seen that the finished non-oriented silicon steel product obtained by the method disclosed in document CN101358272A has higher iron loss in magnetic performance, and the magnetic performance is inferior to that of the finished non-oriented silicon steel product obtained by the method provided by the present invention. When the method disclosed in example 3 of the document CN1796015A is used for designing the components of the invention in example 2, the magnetic property of the obtained non-oriented silicon steel finished product is P1.5/50＝3.133W/kg，B5000/50The magnetic property of the product is 1.73T, which is also inferior to that of the finished product of non-oriented silicon steel obtained by the method provided by the invention. Therefore, the method provided by the invention can obtain the non-oriented silicon steel finished product with better magnetic property under the condition of lower Si content, which cannot be achieved by the method in the prior art.
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 preparation method of rare earth non-oriented silicon steel comprises the following steps: iron making → KR desulfurization → converter → RH refining → continuous casting → heating → hot rolling → layer cooling → coiling → acid rolling → annealing → coating → dry sintering, which is characterized in that: the hot rolling raw material of the rare earth non-oriented silicon steel comprises the following chemical components in percentage by mass: c is less than or equal to 0.004%, Si: 0.5-2.0%, Mn: 0.3-1.0%, Al: 0.3-1.0%, P is less than or equal to 0.10%, S is less than or equal to 0.004%, N is less than or equal to 0.005%, O is less than or equal to 0.008%, and rare earth Ce: 0.0010-0.0090%, and the balance of Fe and inevitable impurities;
after the molten iron is subjected to KR desulfurization treatment, the sulfur content of the molten iron fed into the converter is less than or equal to 0.002%, the tapping temperature of the converter is higher than 1680 ℃, and the tapping temperature drop requirement is lower than 70 ℃;
in the continuous casting process, the casting machine is controlled at a constant drawing speed, and the drawing speed is 0.8-1.2 m/min;
in the heating procedure, the temperature of a heating furnace is 1100-1300 ℃, and the heating time is 1-6 h;
the hot rolling process adopts a 2250mm rolling mill, the initial rolling temperature of the hot rolling is 950-1150 ℃, the final rolling temperature is 800-1000 ℃, the thickness of the hot rolled plate is 1.8-2.8 mm, then the acid rolling is carried out, the thickness after the acid rolling is 0.5mm, the annealing temperature is 900-1050 ℃, and the annealing time is 60-180 s;
the drying and sintering process is to perform drying and sintering at 300-500 ℃.
2. Rare earth non-oriented silicon steel obtained by the process of claim 1.
3. The rare earth non-oriented silicon steel as set forth in claim 2, wherein the rare earth non-oriented silicon steel has a grain size of 60 to 110 μm and a magnetic property of P1.5/50＝2.8～3.1W/kg，B5000/50＝1.68～1.72T。
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113403455A (en) * | 2021-06-17 | 2021-09-17 | 张家港扬子江冷轧板有限公司 | Production method of non-oriented silicon steel |
| CN114107639A (en) * | 2021-11-25 | 2022-03-01 | 包头钢铁（集团）有限责任公司 | Preparation method of common-grade rare earth oriented silicon steel |
| CN115491569A (en) * | 2022-09-15 | 2022-12-20 | 湖南华菱涟钢特种新材料有限公司 | Production method of non-oriented silicon steel and non-oriented silicon steel |
| CN118048574A (en) * | 2024-04-16 | 2024-05-17 | 张家港扬子江冷轧板有限公司 | Non-oriented silicon steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113403455A (en) * | 2021-06-17 | 2021-09-17 | 张家港扬子江冷轧板有限公司 | Production method of non-oriented silicon steel |
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| CN118048574A (en) * | 2024-04-16 | 2024-05-17 | 张家港扬子江冷轧板有限公司 | Non-oriented silicon steel and production method thereof |
| CN118048574B (en) * | 2024-04-16 | 2024-06-11 | 张家港扬子江冷轧板有限公司 | Non-oriented silicon steel and production method thereof |
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Application publication date: 20200821 |