CN113621774B - High-silicon non-oriented electrical steel and production method thereof - Google Patents
High-silicon non-oriented electrical steel and production method thereof Download PDFInfo
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 43
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 33
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 239000010703 silicon Substances 0.000 title claims abstract description 27
- 238000000137 annealing Methods 0.000 claims abstract description 68
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 238000005096 rolling process Methods 0.000 claims abstract description 44
- 238000005097 cold rolling Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 14
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 27
- 238000009749 continuous casting Methods 0.000 claims description 26
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 13
- 238000001953 recrystallisation Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000010606 normalization Methods 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 6
- 238000009966 trimming Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 239000012299 nitrogen atmosphere Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 4
- 238000005098 hot rolling Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000024121 nodulation Effects 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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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
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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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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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Abstract
The invention discloses high-silicon non-oriented electrical steel and a production method thereof. The method comprises the following steps: 1) smelting molten steel and continuously casting into a blank; 2) heating and preserving heat, and then carrying out hot rolling to obtain a hot-rolled coil, wherein the outlet temperature of rough rolling is 940 +/-20 ℃, the finish rolling temperature of finish rolling is 840 +/-20 ℃, and the coiling temperature is 650 +/-20 ℃; 3) normalizing at (732-742) +3000[ Si ]) deg.C for 4-5 min; 4) directly cold rolling after normalizing, and then continuously annealing and coating at 940-990 ℃ for 1.5-3 min; 5) the steel plate after the coating treatment is processed and formed, and then stress relief annealing is carried out, wherein the annealing temperature is ((761-766) +3000[ Si ]) DEG C. Therefore, the problem of high cold rolling difficulty is solved while the magnetic performance is ensured.
Description
Technical Field
The invention belongs to the technical field of steel material preparation, and relates to a production method of high-silicon non-oriented electrical steel and the high-silicon non-oriented electrical steel prepared by the production method.
Background
Along with the enhancement of low carbon, energy saving and environmental protection consciousness and the promotion of national energy efficiency grade of people, the motor is more and more required to realize high efficiency, small size and silence, which puts higher requirements on the magnetic performance of the motor iron core material, namely, the non-oriented electrical steel is required to have lower iron loss and higher magnetic induction intensity.
Increasing the silicon content is one of the important existing means for reducing the iron loss of the non-oriented electrical steel, but the high silicon content can cause the hardness and the brittleness of the non-oriented electrical steel to be increased and the toughness to be reduced, thereby causing the cold rolling production difficulty of the non-oriented electrical steel to be large. Particularly, edge damage, edge cracks and strip breakage are easy to occur in the cold rolling process, and the production efficiency and the yield are influenced.
In addition, in order to improve the magnetic performance of the non-oriented electrical steel, a coarse grain structure is often obtained by using a higher normalizing temperature and annealing temperature in production, but: in the steel obtained by high-temperature normalizing, the brittleness is increased due to coarse grains, and the cold rolling production difficulty is high; high temperature annealing easily causes furnace roller nodulation, poor steel surface quality and other problems.
In conclusion, how to ensure the magnetic performance of the non-oriented electrical steel and effectively solve the problem of high difficulty in cold rolling in the production process is a research focus in the development of the non-oriented electrical steel.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method for producing a high-silicon non-oriented electrical steel, and a high-silicon non-oriented electrical steel produced by the production method.
In order to accomplish the above object, an embodiment of the present invention provides a method for producing a high-silicon non-oriented electrical steel, comprising the steps of,
1) smelting molten steel, and continuously casting the obtained molten steel into a continuous casting blank, wherein the continuous casting blank comprises the following chemical components in percentage by mass: less than or equal to 0.0025 percent of C, 2.3 to 2.8 percent of Si, 0.2 to 0.5 percent of Mn, 0.5 to 1.0 percent of Al, less than or equal to 0.03 percent of Sn, less than or equal to 0.1 percent of P, less than or equal to 0.002 percent of S, and the balance of Fe and inevitable impurities;
2) heating and preserving heat of the continuous casting billet obtained in the step 1, and then sequentially carrying out rough rolling, finish rolling and coiling to obtain a hot-rolled coil, wherein the outlet temperature of a rolling mill used in the rough rolling stage is 940 +/-20 ℃, the finish rolling temperature in the finish rolling stage is 840 +/-20 ℃, and the coiling temperature in the coiling stage is 650 +/-20 ℃;
3) normalizing the hot-rolled coil obtained in the step 2, wherein the normalizing temperature is (732+3000[ Si ]) DEG C to (742+3000[ Si ]) DEG C, the [ Si ] represents the mass percent of Si in the continuous casting billet, and the normalizing time is 4-5 min;
4) directly carrying out cold rolling for more than 3 times before the temperature of the steel plate obtained by normalizing in the step 3 is reduced to 40 ℃, and then carrying out continuous annealing and coating, wherein the annealing temperature is 940-990 ℃ and the annealing time is 1.5-3 min;
5) and (4) processing and forming the steel plate subjected to the coating treatment in the step (4), and then performing stress relief annealing to obtain an electrical steel finished product, wherein the annealing temperature in the stress relief annealing is (761+3000 Si) DEG C to (766+3000 Si) DEG C.
Preferably, in the structure of the steel plate obtained after normalizing in the step 3, the recrystallization rate is 85% -95% and the average size of the recrystallized grains is 40-50 μm, wherein the recrystallization rate is the area fraction occupied by the recrystallized grains.
Preferably, in the structure of the electrical steel finished product obtained after the stress relief annealing in the step 5, the average recrystallized grain size is 100-130 μm.
Preferably, the resulting electrical steel finished product has an iron loss P1.5/50Less than or equal to 2.5W/kg, and magnetic induction intensity B5000≥1.69T。
Preferably, in the step 2, when the continuous casting billet is heated and kept warm, the heating temperature is 1110 +/-20 ℃, and the heat preservation time is 2.5-3 hours.
Preferably, in step 4, the steel sheet obtained after normalizing in step 3 is directly cold rolled without preheating, and trimming is not performed during cold rolling.
Preferably, in the step 4, during cold rolling, the reduction rate of the first pass is 30-35%, the reduction rate of the last pass is 18-23%, and the reduction rates of the rest passes are 20-30%.
Preferably, in step 4, pure N is used for continuous annealing2Atmosphere, wherein the dew point temperature is-60 ℃ to 0 ℃.
Preferably, in step 5, the steel plate subjected to the coating treatment in step 4 is subjected to a blanking process to form an iron core.
In order to achieve the aim, the invention further provides the high-silicon non-oriented electrical steel prepared by the production method.
Compared with the prior art, the invention has the beneficial effects that: on the basis of the chemical components with high silicon content, technological means such as normalizing, continuous annealing and stress relief annealing are combined, on one hand, the steel plate obtained after normalizing has excellent toughness and machinability, the rolling difficulty of a cold rolling procedure is reduced, cold rolling is directly carried out under the condition of not preheating, the risks of cold rolling edge cracking and strip breakage in the prior art are avoided, trimming is not needed during cold rolling, and the yield is improved; on the other hand, the method realizes low-temperature continuous annealing, reduces energy consumption, reduces the pressure born by a continuous annealing unit used in the continuous annealing process, eliminates the problems of equipment loss of furnace roller nodulation, poor surface quality of steel and the like, reduces equipment cost and improves the surface quality of finally obtained non-oriented electrical steel compared with the existing high-temperature annealing; more importantly, the magnetic property of the finally obtained non-oriented electrical steel is improved, and the magnetic property advantage of the high-silicon non-oriented electrical steel is fully exerted.
Detailed Description
The technical solution of the present invention will be further described with reference to the following specific embodiments.
In one embodiment, the invention provides a production method of non-oriented electrical steel and the non-oriented electrical steel prepared by the production method. Specifically, the production method includes the following steps.
1) Steel making and continuous casting
In the step, molten steel is smelted, and the obtained molten steel is continuously cast into a continuous casting billet.
Wherein the chemical components finally obtained by smelting the molten steel are consistent with the chemical components of the continuous casting billet and the chemical components of the non-oriented electrical steel finally obtained by the production method. Specifically, the chemical components of the continuous casting billet comprise the following components in percentage by mass: less than or equal to 0.0025 percent of C, 2.3 to 2.8 percent of Si, 0.2 to 0.5 percent of Mn, 0.5 to 1.0 percent of Al, less than or equal to 0.03 percent of Sn, less than or equal to 0.1 percent of P, less than or equal to 0.002 percent of S, and the balance of Fe and inevitable impurities. Namely, the non-oriented electrical steel prepared by the production method is high-silicon non-oriented electrical steel with the silicon content of 2.3% -2.8%.
2) Heating and hot rolling
In the step, the continuous casting slab obtained in the previous step 1 is heated and insulated, and then rough rolling, finish rolling and coiling are sequentially carried out to obtain a hot rolled coil. That is, the hot rolling process is divided into a rough rolling stage, a finish rolling stage and a coiling stage.
Wherein the outlet temperature of a rolling mill used in the rough rolling stage is 940 +/-20 ℃, the finish rolling temperature in the finish rolling stage is 840 +/-20 ℃, and the coiling temperature in the coiling stage is 650 +/-20 ℃. Thus, the structure control in the hot rolling can be facilitated by the low-temperature finish rolling and the low-temperature coiling.
3) Normalizing
In this step, the hot rolled coil obtained in the previous step 2 is subjected to a normalizing process.
The normalizing temperature is (732+3000[ Si ]) DEG C to (742+3000[ Si ]) DEG C, wherein [ Si ] represents the mass percentage of Si in the continuous casting billet, the value of [ Si ] can be obtained by sampling and detecting the continuous casting billet obtained in the step 1, for example, the [ Si ] is 2.3%, and the normalizing temperature is controlled in the range of 801-811 ℃. The normalizing time is 4-5 min.
Thus, through the control of the normalizing temperature and the normalizing time, low-temperature normalizing is realized, so that partial recrystallization (namely, recrystallization is not completely finished or complete recrystallization is not generated) occurs in the normalizing process, and further, the recrystallization rate (namely, the area fraction occupied by the recrystallized grains) and the recrystallized grain size in the steel plate structure obtained after normalizing are accurately controlled, specifically, the recrystallization rate is 85% -95%, and the average recrystallized grain size is 40-50 μm.
4) Single stand cold rolling, continuous annealing and coating
In this step, first, the temperature of the steel sheet obtained after normalization in step 3 is reduced to 40 ℃, and then, cold rolling is performed for 3 or more passes without pretreatment, that is, cold rolling has at least 3 passes. Specifically, on the basis of the normalization in the step 3, the normalized steel plate has excellent toughness and machinability, so that the cold rolling can be directly carried out without preheating, the stable production of the cold rolling can be ensured, the risks of cold rolling edge cracking and strip breakage in the prior art are avoided, the edge cutting is not needed during the cold rolling, and the yield is improved; moreover, the equipment investment is reduced, and the production cost is reduced.
After cold rolling, continuous annealing and coating are performed. Wherein the annealing temperature is 940-990 ℃ and the annealing time is 1.5-3 min. Therefore, through the control of the annealing temperature and the annealing duration, the low-temperature continuous annealing is realized, the energy consumption is reduced while the steel structure is ensured, the pressure born by a continuous annealing unit used in the continuous annealing process is reduced, and compared with the existing high-temperature annealing, the problems of equipment loss of furnace roller nodulation, poor steel surface quality and the like are solved, the equipment cost is reduced, and the surface quality of the finally obtained non-oriented electrical steel is improved.
5) Machining forming and stress relief annealing
In the step, the steel plate after the coating treatment in the step 4 is processed and formed, and then stress relief annealing is carried out to obtain an electrical steel finished product.
Wherein the annealing temperature in the stress relief annealing is (761+3000[ Si ]) ° C to (766+3000[ Si ]) ° C, and [ Si ] represents the mass percentage of Si in the continuous casting billet, as with [ Si ] in the step 3 above. For example, if [ Si ] is 2.3%, the annealing temperature in the stress relief annealing is controlled to be 830 to 835 ℃.
Therefore, on the basis of the prior normalizing and continuous annealing, the stress relief annealing technology is combined, on one hand, the internal stress caused by processing is eliminated, and the magnetic performance deterioration caused by coercive force increase and hysteresis loss is avoided; on the other hand, the recrystallized grains in the steel can be fully grown, and specifically, the average size of the recrystallized grains in the electrical steel finished product structure obtained after stress relief annealing is 100-130 mu m, so that the magnetic performance of the electrical steel finished product is greatly improved compared with the prior art.
In combination with the above, compared with the prior art, the embodiment combines the process means of normalizing, continuous annealing, stress relief annealing and the like on the basis of the chemical components with high silicon content, on one hand, the steel plate obtained after normalizing has excellent toughness and workability, reduces the rolling difficulty of the cold rolling process, directly performs cold rolling without preheating, avoids the risks of cold rolling edge cracking and strip breakage in the prior art, does not need to perform edge cutting during cold rolling, and improves the yield; on the other hand, the method realizes low-temperature continuous annealing, reduces energy consumption, reduces the pressure born by a continuous annealing unit used in the continuous annealing process, eliminates the problems of equipment loss of furnace roller nodulation, poor surface quality of steel and the like, reduces equipment cost and improves the surface quality of finally obtained non-oriented electrical steel compared with the existing high-temperature annealing; more importantly, the magnetic property of the finally obtained non-oriented electrical steel is improved, and the magnetic property advantage of the high-silicon non-oriented electrical steel is fully exerted.
In the present embodiment, the iron loss P of the electrical steel product obtained1.5/50Less than or equal to 2.5W/kg, and magnetic induction intensity B5000Not less than 1.69T, and excellent magnetic performance.
Preferably, in the step 2, when the continuous casting billet is heated and kept warm, the heating temperature is 1110 +/-20 ℃, and the heat preservation time is 2.5-3 h, so that the solid solution of coarse precipitates such as MnS, AlN and the like in the continuous casting billet can be avoided by adopting a low heating temperature, the precipitate control in the subsequent rough rolling and finish rolling processes is further ensured, and the magnetic performance of the finally obtained non-oriented electrical steel is further improved.
Preferably, in the step 4, during cold rolling, the reduction rate of the first pass is 30-35%, the reduction rate of the last pass is 18-23%, and the reduction rates of the rest passes are 20-30%. Not only effectively avoiding cold rolling strip breakage in the single-rack cold rolling process, but also reducing rolling passes and ensuring good plate shape of the steel plate.
Preferably, in step 4, pure N is used for continuous annealing2The atmosphere has the dew point temperature of-60-0 ℃, so that the internal oxidation of the steel plate can be further prevented, and the quality of the steel plate is ensured.
In step 5, the steel sheet subjected to the coating treatment in step 4 is subjected to a punching process to form an iron core. That is, the present embodiment may be manufactured into an iron core product by the manufacturing method, or the obtained electrical steel product may be finally used as an iron core, but is not limited thereto.
Compared with the prior art, the beneficial effects of this embodiment lie in: the non-oriented electrical steel has excellent magnetic performance, the rolling difficulty of a cold rolling process is reduced, cold rolling is directly carried out without preheating, the risks of cold rolling edge cracking and strip breakage in the prior art are avoided, trimming is not needed during cold rolling, and the yield is improved; the problems of equipment loss of furnace roller nodulation, poor surface quality of steel and the like in the continuous annealing process are solved, the equipment cost is reduced, and the surface quality of the finally obtained non-oriented electrical steel is improved.
The detailed description set forth above is merely a specific description of possible embodiments of the present invention and is not intended to limit the scope of the invention, which is intended to include within the scope of the invention equivalent embodiments or modifications that do not depart from the technical spirit of the present invention.
The following provides 2 examples of the present invention to further illustrate the technical solution of the present invention. These embodiments are, of course, only a few, but not all, of the many possible variations that may be encompassed by the invention.
Example 1
The non-oriented electrical steel is prepared by the following method:
1) smelting molten steel by adopting a clean steel technology, and continuously casting the obtained molten steel into a continuous casting blank; the continuous casting billet comprises the following chemical components in percentage by mass: 0.0024 percent of C, 2.31 percent of Si, 0.5 percent of Mn, 0.5 percent of Al, 0.027 percent of Sn, 0.05 percent of P, 0.0019 percent of S, and the balance of Fe and inevitable impurities;
2) heating and preserving heat for the continuous casting billet obtained in the step 1, wherein the heating temperature is 1128 ℃, and the preserving heat duration is 2.5 hours; then, rough rolling, finish rolling and coiling are sequentially carried out to obtain a hot rolled coil with the thickness of 2.3mm, wherein the outlet temperature of a rolling mill used in the rough rolling stage is 948 ℃, the finish rolling temperature in the finish rolling stage is 855 ℃, and the coiling temperature in the coiling stage is 665 ℃;
3) normalizing the hot-rolled coil obtained in the step 2, wherein the normalizing temperature is 810 ℃, and the normalizing time is 5 min; metallographic structure detection is carried out on the normalized steel plate, the visible recrystallization rate is 85%, and the average size of recrystallized grains is 40 mu m;
4) directly carrying out 5-pass cold rolling on the steel plate obtained after normalizing in the step 3 before cooling to 40 ℃, wherein the thickness of the obtained steel plate is 0.5 mm; wherein the first pass reduction rate is 33%, the last pass reduction rate is 20.6%, and the rest passes reduction rates are 23-28%;
after cold rolling, continuous annealing and coating are carried out; wherein, pure N is adopted in the continuous annealing2Atmosphere, dew point temperature is-20 ℃, annealing temperature is 940 ℃ and annealing time is 3 min;
5) and (4) blanking the steel plate subjected to the coating treatment in the step (4) to form an iron core, and then performing stress relief annealing, wherein the annealing temperature during the stress relief annealing is 831 ℃, and the temperature is kept for 3 hours to obtain a finished electrical steel product.
The product obtained in step 5 of this example was sampled and examined for metallographic structure and magnetic properties, and it was found that its recrystallized grain size was 110 μm on average and its iron loss P was1.5/50Magnetic induction B of =2.485W/kg5000=1.715T。
Example 2
The non-oriented electrical steel is prepared by the following method:
1) smelting molten steel by adopting a clean steel technology, and continuously casting the obtained molten steel into a continuous casting blank; the continuous casting billet comprises the following chemical components in percentage by mass: 0.0017 percent of C, 2.8 percent of Si, 0.2 percent of Mn, 0.9 percent of Al, 0.03 percent of Sn, 0.03 percent of P, 0.0008 percent of S and the balance of Fe and inevitable impurities;
2) heating and preserving heat for the continuous casting billet obtained in the step 1, wherein the heating temperature is 1105 ℃ and the preserving heat duration is 3 hours; then, carrying out rough rolling, finish rolling and coiling in sequence to obtain a hot-rolled coil plate with the thickness of 2.3mm, wherein the outlet temperature of a rolling mill used in the rough rolling stage is 940 ℃, the finish rolling temperature in the finish rolling stage is 830 ℃, and the coiling temperature in the coiling stage is 635 ℃;
3) normalizing the hot-rolled coil obtained in the step 2, wherein the normalizing temperature is 825 ℃ and the normalizing time is 4 min; the normalized steel plate is subjected to metallographic structure detection, the visible recrystallization rate is 95%, and the average size of recrystallized grains is 48 mu m;
4) directly carrying out 5-pass cold rolling on the steel plate obtained after normalizing in the step 3 before cooling to 40 ℃, wherein the thickness of the obtained steel plate is 0.5 mm; wherein the first pass reduction rate is 30.8%, the last pass reduction rate is 21.9%, and the rest passes reduction rates are 23-30%;
after cold rolling, continuous annealing and coating are carried out; wherein, pure N is adopted in the continuous annealing2Atmosphere, dew point temperature is-55 ℃, annealing temperature is 990 ℃ and annealing time is 1.8 min;
5) and (4) blanking the steel plate subjected to the coating treatment in the step (4) to form an iron core, and then performing stress relief annealing, wherein the annealing temperature during the stress relief annealing is 845 ℃ and the heat is preserved for 3 hours to obtain a finished electrical steel product.
The product obtained in step 5 of this example was sampled and examined for metallographic structure and magnetic properties, and it was found that its recrystallized grain size was 125 μm on average and its iron loss P was1.5/50Magnetic induction B of =2.11W/kg5000=1.695T。
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| CN100999050A (en) * | 2006-01-11 | 2007-07-18 | 宝山钢铁股份有限公司 | Production method of low iron loss high magnetic sensing cold milling orientation less electrical steel plate |
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| CN110468352A (en) * | 2019-09-25 | 2019-11-19 | 江苏沙钢集团有限公司 | A kind of non-orientation silicon steel and its production method |
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