CN114107640B - 35WD1600 electrical steel for new energy automobile driving motor and production method thereof - Google Patents
35WD1600 electrical steel for new energy automobile driving motor and production method thereof Download PDFInfo
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000005096 rolling process Methods 0.000 claims abstract description 69
- 238000000137 annealing Methods 0.000 claims abstract description 41
- 229910052742 iron Inorganic materials 0.000 claims abstract description 32
- 238000005261 decarburization Methods 0.000 claims abstract description 27
- 238000005097 cold rolling Methods 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 239000002253 acid Substances 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000007670 refining Methods 0.000 claims abstract description 8
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 89
- 239000010959 steel Substances 0.000 claims description 89
- 230000009467 reduction Effects 0.000 claims description 57
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 24
- 229910052760 oxygen Inorganic materials 0.000 claims description 24
- 239000001301 oxygen Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 21
- 238000010079 rubber tapping Methods 0.000 claims description 21
- 238000007664 blowing Methods 0.000 claims description 20
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 238000005554 pickling Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 11
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005098 hot rolling Methods 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 238000007761 roller coating Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical group [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 abstract description 19
- 238000003466 welding Methods 0.000 abstract description 11
- 238000004080 punching Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 12
- 230000006698 induction Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- 238000005238 degreasing Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 3
- 238000009529 body temperature measurement Methods 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000010436 fluorite Substances 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 241000255789 Bombyx mori Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000616 Ferromanganese Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- KCZFLPPCFOHPNI-UHFFFAOYSA-N alumane;iron Chemical compound [AlH3].[Fe] KCZFLPPCFOHPNI-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—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 with diffusion of elements, e.g. decarburising, nitriding
-
- 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
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
-
- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses 35WD1600 electrical steel for a new energy automobile driving motor and a production method thereof. Belongs to the technical field of new energy automobile driving motor electrical steel production, and mainly solves the technical problem that the performance of the new energy driving motor electrical steel in the prior art is poor, and the new energy automobile driving motor electrical steel comprises the following chemical element components in percentage by weight: less than or equal to 0.005% of C, 2.5-2.8% of Si, 0.2-0.4% of Mn, 0.08-0.12% of P, less than or equal to 0.008% of S, 0.20-0.30% of Cu, 0.16-0.25% of Ni, 0.3-0.5% of Al, and the balance of Fe and unavoidable impurities. The production method comprises the following steps: (1) molten iron pretreatment; (2) converter smelting; (3) RH refining; (4) continuous casting and rolling; (5) acid washing; (6) first cold-rolling decarburization annealing; (7) a second cold rolling decarburization annealing; (8) a coating; (9) sintering and coiling. The 35WD1600 electrical steel for the new energy automobile driving motor has the performance meeting the national standard and the customer requirements of cold-rolled non-oriented electrical steel strips for the new energy automobile driving motor, and has good welding performance, plate shape and punching performance.
Description
Technical Field
The invention relates to a technology for producing electric steel of a driving motor of a new energy automobile, in particular to 35WD1600 electric steel for the driving motor of the new energy automobile and a production method thereof.
Background
Because the energy efficiency of the motor and the electrical products is greatly dependent on the electromagnetic performance of the electrical steel. In addition, under the large background of 'carbon reaching peak', 'carbon neutralization', the requirements for energy conservation and emission reduction are increasingly improved, and the national requirements for energy efficiency upgrading of transformers, motors and household appliances are strict, so that the improvement of energy efficiency standards in downstream manufacturing industry in the future increases the demand of high-grade non-oriented silicon steel, and the market of low-end products is fed by silkworms gradually.
The power (torque), efficiency and service life of the new energy automobile driving motor are greatly related to those of the non-oriented electrical steel sheet, particularly the non-oriented electrical steel sheet used for the motor rotor, and the magnetic performance determines the torque and efficiency of the motor; for example, the lower the iron loss of the electrical steel sheet is, the higher the motor efficiency is, and the magnetic induction is increased to increase the motor torque; meanwhile, the mechanical property determines the machining precision, service bearing strength and maximum rotation speed of the stator and the rotor. Therefore, the driving motor of the new energy automobile has the following requirements on the adopted electrical steel sheet: (1) For a good driving experience, the motor needs to provide high torque for starting, and the driving current and the magnetic induction of the used electric steel must be increased to increase the torque; (2) To improve the energy conversion efficiency, the motor efficiency is generally 85% -93% in the most frequently used driving mode, and the electric steel sheet used by the motor is required to have excellent magnetic performance, namely high magnetic induction under medium-low magnetic field and low iron loss under high frequency; (3) The high running speed requires high-speed running (6000-15000 r/min) of the motor rotor, and the electrical steel sheet used is required to have high enough strength to resist centrifugal force; this requires the use of high strength electrical steels; particularly for a permanent magnet drive motor, the magnetic poles are embedded in the rotor, so that the strength of the rotor is important; (4) Reducing the gap between the rotor and the stator can effectively improve the magnetic flux density, which requires good sheet punching property of the electrical steel sheet; (5) During the service period of the automobile, the high-speed rotating electrical steel sheet in the service period cannot be subjected to fatigue failure, namely, the high fatigue life.
Therefore, it is important to produce high-quality non-oriented electrical steel for the driving motor of the new energy automobile to meet the requirement of the new energy automobile which is increasingly developed in China. The non-oriented electrical steel 35WD1600 for the new energy automobile driving motor of the new energy automobile produced by the existing technology in China has the defects of poor electromagnetic performance, unstable quality, high production cost and the like. The non-oriented electrical steel for the new energy automobile driving motor, which has good electromagnetic performance and meets the national standard and the customer requirements, can be stably produced by the method.
Disclosure of Invention
The invention aims to provide a production method of 35WD1600 electrical steel for a driving motor of a new energy automobile. The performance of the full-process cold-rolled non-oriented electrical steel produced by the method meets the requirements of high-strength non-oriented electrical steel for a driving motor of a new energy automobile.
The second purpose of the invention is to provide the 35WD1600 electrical steel for the driving motor of the new energy automobile manufactured by the production method.
The technical scheme of one of the purposes of the invention is as follows: a production method of 35WD1600 electrical steel for a new energy automobile driving motor comprises the following steps:
(1) And (3) molten iron pretreatment: carrying out magnesium blowing desulfurization treatment on molten iron, and pouring the desulfurized molten steel into an oxygen top-bottom composite converting converter;
(2) Smelting in a converter: adding scrap steel into a converter for blowing, then performing oxygen fixation and tapping, adding a composite deoxidizer during tapping, and blowing argon in the whole course;
(3) RH refining: molten steel is sent into a vacuum RH refining furnace for smelting, and after preliminary alloying, the flow of argon is controlled to perform preliminary adjustment on components;
(4) Continuous casting and rolling: casting the molten steel into a thick plate blank by using a thin plate blank continuous casting machine, and rolling to obtain a hot rolled plate;
(5) Acid washing: pickling the hot rolled plate obtained in the step (4) with hydrochloric acid;
(6) First cold rolling and decarburization annealing: rolling the steel strip subjected to acid cleaning in the step (5) by a 20-roll sendzimir mill, and then decarburizing and annealing;
(7) Secondary cold rolling and decarburization annealing: carrying out secondary rolling and decarburization annealing on the steel strip obtained in the step (6) by using a 20-roll Send Jimie rolling mill;
(8) And (3) coating: the steel strip obtained in the step (7) is discharged from a water quenching cooling device, the temperature of the steel strip is adjusted by a water spray cooler, residual moisture on the surface is extruded by a squeezing roller, and the steel strip is dried by a hot air dryer and then enters a 2-roller coating machine set for coating;
(9) Sintering and coiling: and (5) placing the coated steel strip into a sintering furnace for sintering, cooling and coiling.
In the step (1), pouring the molten iron from a tapping or blast furnace tank of a mixer furnace to a ladle on a ladle seat of a ladle car, determining the magnesium injection amount according to the initial [ S ] and the target [ S ] of the molten iron, controlling the injection process well, and ensuring that the sulfur content of the molten iron after pretreatment is less than or equal to 0.001%; after desulfurization, the molten iron slag must be scraped off, and the exposed area of the molten iron is required to be more than 90 percent.
In the step (2), the total weight of the added scrap steel is 10-18%, argon is blown at the bottom in the whole smelting process, and the bottom blowing strength is more than 0.05Nm 3 /min.t, ensuring the end point molten steel [ C ] of the converter]*[O]The product is near the balance value, and the smelting end point of the converter needs to measure temperature, sample and fix oxygen. Deoxidizing by adding deoxidizing agent according to the oxygen value, and ensuring the incoming oxygen of molten steel to be 400-700ppm. When the end point oxygen content of converter is greater than 900ppm, proper quantity of aluminium iron (grain) deoxidation (reference value 10Kg aluminium 100ppm O)]) And (3) adding 300Kg of lime per furnace in the tapping process, adding 150Kg of slag modifier per furnace after tapping, and adding a proper amount of aluminum particles on the slag surface.
In the step (3), the argon flow is controlled to be 130-160 m 3 And (h) firstly adding aluminum blocks for deoxidization, then adjusting Als to a target value, and then adding low-carbon ferromanganese, ferrophosphorus and the like for primary adjustment of components. After alloy is added, the alloy is circulated for 2 to 4 minutes under the limit vacuum degree (less than or equal to 130Pa, the instrument is shown as 0 Pa), and the temperature measurement, sampling and oxygen determination are carried out. If the primary tuning component does not meet the steel grade requirement, the component fine tuning is performed.
In the step (4), in the casting process, the sealing of the big ladle and the middle ladle is ensured; 2 sealing rings are added into the long water gap for sealing; the middle ladle temperature measurement and sampling port is sealed by adding 1-2 bags of covering agent after each temperature measurement and sampling, electromagnetic stirring is adopted, the thick slab is 70mm, the continuous casting machine pulling speed is 3.0-4.5 m/min, the continuous casting blank furnace temperature is more than or equal to 800 ℃, the rolling mill F1 rolling reduction rate is more than or equal to 50%, the F2 rolling reduction rate is more than or equal to 50%, the F1-F4 cumulative rolling reduction rate is more than or equal to 90%, the F7 pass adopts the small rolling reduction rate of less than or equal to 8%, and the slab thickness after hot rolling is 2.0-3.0 mm.
In the step (5), the concentration of hydrochloric acid is 80-150 g/L, the temperature of an acid tank is 80-95 ℃, the acid pickling time is 60-120s, the surface quality control of strip steel is good, the iron scale on the surface of a product after hot rolling is compact, the iron scale is sticky, and the uncoiling tension is increased by 10-15% during acid pickling.
In the step (6), the rolling mill rolls for 7 to 9 times, the thickness of a plate blank is 0.50 to 0.60mm, the total rolling reduction rate is less than or equal to 85 percent, the rolling reduction rate of the previous 3 passes is more than or equal to 20 percent, the rolling reduction rate of the last pass is less than or equal to 5 percent, the furnace temperature is 870 to 920 ℃, and the decarburization annealing is performed by 80 to 85 percent of N 2 +15～20％H 2 +0.1～0.5％H 2 O was used as a decarburization annealing atmosphere.
In the step (7), the rolling mill rolls for 3-7 times, the thickness of a plate blank is 0.35-0.40mm, the total rolling reduction is more than or equal to 30%, the reduction of the previous 3 times is more than or equal to 10%, the reduction of the last frame is less than or equal to 5%, and the furnace temperature is 850-900 ℃.
In the step (9), the sintering temperature is 300-450 ℃, the coiling tension is 150-170 Mpa, and the coiling temperature is 650-680 ℃.
The second technical scheme of the invention is as follows: the 35WD1600 electrical steel for the new energy automobile driving motor comprises the following chemical element components in percentage by weight: less than or equal to 0.005% of C, 2.5-2.8% of Si, 0.2-0.4% of Mn, 0.08-0.12% of P, less than or equal to 0.008% of S, 0.20-0.30% of Cu, 0.16-0.25% of Ni, 0.3-0.5% of Al, and the balance of Fe and unavoidable impurities.
Advantageous effects
1. The invention relates to a new energy automobile driveThe performance of the 35WD1600 electrical steel for the motor meets the requirements of high-strength non-oriented electrical steel for a driving motor of a new energy automobile. Iron loss P of product 15/50 ≤2.10W/kg，P 10/400 Less than or equal to 15.0W/kg, minimum magnetic polarization intensity J 5000 More than or equal to 1.64T, compared with the existing cold-rolled non-oriented electrical steel national standard GB/T34215-2017 common 35WD1600 for electric automobile driving, the iron loss is lower by 1.4W/kg, the magnetic induction intensity is higher by 0.01T, the electromagnetic performance meets the national standard requirement, the yield strength is more than or equal to 400MPa, the tensile strength is more than or equal to 520MPa, the elongation is more than or equal to 17%, the bending times are more than or equal to 6 times, the same plate difference is less than or equal to 10um, and the interlayer resistance is more than or equal to 2100 Ω & mm 2 And the sheet meets the national standard and high quality requirements, and has good welding performance and punching performance.
2. The production method of 35WD1600 electrical steel for the new energy automobile driving motor is easier to control in the hot rolling and twice cold rolling processes, and is more stable in production and more controllable in plate shape.
3. The 35WD1600 electrical steel for the new energy automobile driving motor has obviously improved rust resistance in the wet weather in the south.
4. According to the production method of 35WD1600 electrical steel for the driving motor of the new energy automobile, in the hot rolling step, the rolling reduction is controlled in the maximum allowable range of equipment in the first 3-4 passes, the rolling mill F1 reduction is more than or equal to 50%, the F2 reduction is more than or equal to 50%, the F1-F4 accumulated reduction is more than or equal to 90%, the F7 pass adopts the small reduction, the reduction is less than or equal to 8%, so as to adjust the shape and induce grain coarsening, and therefore, the arrangement of the hot rolling reduction simultaneously solves the problems of strip steel shape control and grain coarsening.
5. According to the production method of 35WD1600 electrical steel for the new energy automobile driving motor, in the hot rolling step, the whole-section laminar cooling method is adopted to cool to the coiling temperature of 650-680 ℃ and the coiling temperature is carried out to carry out stacking cooling, so that the iron scale easy to break is formed, and the pickling process efficiency is higher.
Detailed Description
The invention will be further illustrated with reference to specific examples.
Example 1
Pouring blast furnace molten iron into a ladle, performing magnesium blowing desulfurization through molten iron pretreatment, pouring the desulfurized molten steel into an oxygen top-bottom composite converting converter, simultaneously adding waste steel accounting for 12 percent of the total weight into the converter, adding limestone and fluorite into the converter in the converting process, adopting a whole-course bottom argon blowing process for the converter, and obtaining molten steel component [ C ]]≤0.06％，[S]And when the final temperature of the molten steel is 1650 ℃, tapping by fixed oxygen, adding a composite deoxidizer during tapping of the converter, blowing argon in the whole process of tapping of the converter, and measuring the temperature of the molten steel, fixing oxygen and sampling after blowing the argon. Feeding aluminum wires into the molten steel according to the oxygen content in the molten steel, and sending the molten steel into a vacuum RH refining furnace for smelting to ensure that the molten steel is of [ C ]]＝0.03％，[Si]＝2.50％，[Mn]＝0.40％，[P]＝0.12％，[S]＝0.003％，[Cu]＝0.25％，[Ni]＝0.20％，[Al]=0.40%, the remainder being Fe and unavoidable impurities. The tapping temperature is 1580 ℃, the molten steel is cast into a slab with the thickness of 70mm by a thin slab caster, the drawing speed of the caster is 3.0m/min, the continuous casting blank is fed into a furnace at 815 ℃, the temperature of a heating section in the furnace is 1050 ℃, the slab tapping temperature is 1020 ℃, the finish rolling outlet temperature is 900 ℃, the coiling temperature is 650 ℃, the F1 rolling reduction rate is 51.8%, the F2 rolling reduction rate is 50.4%, the F1-F4 cumulative rolling reduction rate is 90.2%, the F7 rolling reduction rate is 6.8%, and the hot rolled plate with the thickness of 2.5mm is rolled. The hot rolled plate is pickled by hydrochloric acid with the concentration of 105g/L after the temperature is lower than 60 ℃, the temperature of an acid tank is 85 ℃, and the pickling time is 120 seconds. The impurities and iron scales on the surface of the steel coil are removed, the steel coil after pickling is rolled for the second time by a 20-roller Senamier rolling mill, decarburization annealing is performed in the middle, the first cold rolling is rolled to be 0.55mm thick, the total rolling reduction is 80.1%, the first 3-pass rolling reduction is 24.8%, 22.5% and 21.6%, and the last rolling reduction is 2.1%. Then the degreasing is finished, and the steel is put into an annealing furnace for decarburization annealing, and the preheating section and the heating section of the furnace are heated by radiant tubes and are N 2 As a protective gas, the furnace temperature is set to 920 ℃, the decarburization annealing section adopts resistance heating to keep the temperature uniform, and 85 percent N is adopted 2 +15％H 2 +0.5％H 2 O is used as a decarburization annealing atmosphere, and the second cold rolling is performed after the decarburization annealing is completed. The total rolling reduction in the second cold rolling is 41.7%, and the rolling reduction in the first 3 passes is 15 respectively3%, 13.8%, 11.6% and the last frame depression rate is 2.3%. The cold rolling thickness was 0.35mm. And (3) uncoiling the rolled non-oriented electrical steel chilled steel coil, performing full-automatic welding by adopting a welding machine, and entering an annealing furnace for annealing after degreasing is finished. The preheating section and the heating section of the furnace are heated by radiant tubes, and N is adopted 2 As protective gas, the furnace temperature is set to 900 ℃, and the annealing section is heated by resistance to keep the temperature uniform. After the steel strip subjected to heat treatment comes out of the water quenching cooling device, the temperature of the steel strip is adjusted by a water spray cooler, residual moisture on the surface is extruded by a wringing roller, the steel strip dried by a hot air dryer enters a 2-roller coating machine set for coating, the steel strip enters a sintering furnace after the coating, the furnace temperature is set to 300 ℃, and the steel strip is cooled to room temperature by an air jet cooler after being discharged. And (3) coiling with large tension, coiling tension of 155MPa, and finally performing performance detection, and packaging and warehousing after the detection is qualified.
The method produces the non-oriented electrical steel for the 35WD1600 new energy automobile driving motor, and the product has iron loss P 15/50 At 2.10W/kg, P 10/400 At 14.8W/kg, minimum magnetic polarization intensity J 5000 1.64T. Compared with the existing cold-rolled non-oriented electrical steel national standard GB/T34215-2017 common 35WD1600 for electric automobile driving, the magnetic induction density is 0.01T higher than the national standard, the electromagnetic performance is better than the national standard, the yield strength is 415MPa, the tensile strength is 525MPa, the elongation is 17%, the bending times are 6 times, the same plate difference is 8 mu m, and the interlayer resistance is more than or equal to 2110 omega-mm 2 The welding performance, the plate shape and the punching performance of the sheet are good, and the national standard and the high quality requirement are met.
Example 2
Pouring blast furnace molten iron into a ladle, performing magnesium blowing desulfurization through molten iron pretreatment, pouring the desulfurized molten steel into an oxygen top-bottom composite converting converter, simultaneously adding clean scrap steel accounting for 18 percent of the total weight into the converter, adding limestone and fluorite into the converter in the converting process, adopting a whole-course bottom argon blowing process for the converter, and obtaining the molten steel component [ C ]]≤0.06％，[S]Less than or equal to 0.002%, when the end temperature of molten steel is 1650 ℃, tapping by fixed oxygen, adding composite deoxidizer during tapping of a converter, blowing argon in the whole process of tapping of the converter, measuring the temperature of molten steel, fixing oxygen, taking out after blowing argonAnd (5) sampling. Feeding aluminum wires into the molten steel according to the oxygen content in the molten steel, and sending the molten steel into a vacuum RH refining furnace for smelting to ensure that the molten steel is of [ C ]]＝0.03％，[Si]＝2.8％，[Mn]＝0.30％，[P]＝0.12％，[S]＝0.003％，[Cu]＝0.30％，[Ni]＝0.24％，[Al]=0.32%, the remainder being Fe and unavoidable impurities. The tapping temperature is 1570 ℃, molten steel is cast into a slab with the thickness of 70mm by a thin slab caster, the casting speed of the caster is 4.0m/min, the continuous casting blank feeding temperature is 865 ℃, the temperature of a heating section in the furnace is 1030 ℃, the slab discharging temperature is 1000 ℃, the finish rolling outlet temperature is 900 ℃, the coiling temperature is 650 ℃, the F1 rolling reduction rate is 52.2%, the F2 rolling reduction rate is 51.4%, the F1-F4 cumulative rolling reduction rate is 90.2%, the F7 rolling reduction rate is 7.6%, and the hot rolled plate with the thickness of 3.0mm is rolled. The hot rolled plate is pickled by hydrochloric acid with the concentration of 105g/L after the temperature is lower than 60 ℃, the temperature of an acid tank is 90 ℃, and the pickling time is 120 seconds. And (3) removing impurities and iron scales on the surface of the steel coil, carrying out secondary rolling on the steel coil after pickling by a 20-roller Senamil rolling mill, carrying out intermediate decarburization annealing, carrying out primary cold rolling to 0.6mm thick, wherein the total rolling reduction is 80.4%, the first 3-pass rolling reduction is 25.1%, 22.2% and 21.3%, and the last 3-pass rolling reduction is 3.1%. Then the degreasing is finished, and the steel is put into an annealing furnace for decarburization annealing, and the preheating section and the heating section of the furnace are heated by radiant tubes and are N 2 As protective gas, the furnace temperature is set to 900 ℃, the decarburization annealing section is heated by resistance to keep the temperature uniform, and 82% N is adopted 2 +18％H 2 +0.2％H 2 O is used as a decarburization annealing atmosphere, and the second cold rolling is performed after the decarburization annealing is completed. The total rolling reduction in the second cold rolling is 36.5%, the rolling reduction in the first 3 passes is 14.3%, 12.8% and 10.6%, and the rolling reduction in the last frame is 2.0%. The cold rolling thickness was 0.35mm. And (3) uncoiling the rolled non-oriented electrical steel chilled steel coil, welding by adopting a welding machine, and annealing in an annealing furnace after degreasing. The preheating section and the heating section of the furnace are heated by radiant tubes, and N is adopted 2 As protective gas, the furnace temperature is set to 880 ℃, and the annealing section is heated by resistance to keep the temperature uniform. After the heat treated steel belt comes out from the water quenching cooling device, the temperature of the steel belt is adjusted by a water spray cooler, and the surface residues are extruded by a wringing rollerAnd (3) the water content, the strip steel after being dried by the hot air dryer enters a 2-roller coating machine set for coating, the strip steel after being coated enters a sintering furnace, the furnace temperature is set to be 350 ℃, and the strip steel is cooled to the room temperature by adopting an air jet cooler after being discharged. And (3) coiling with large tension, coiling with the tension of 170MPa, performing performance detection, and packaging and leaving after the detection is qualified.
The method produces the non-oriented electrical steel for the 35WD1600 new energy automobile driving motor, and the product has iron loss P 15/50 2.00W/kg, P 10/400 At 14.7W/kg, minimum magnetic polarization intensity J 5000 1.64T. Compared with the existing cold-rolled non-oriented electrical steel national standard GB/T34215-2017 common 35WD1600 for electric automobile driving, the magnetic induction density is 0.01T with low iron loss of 1.3W/kg, the electromagnetic performance is better than the national standard requirement, the yield strength is 420MPa, the tensile strength is 525MPa, the elongation is 18 percent, the bending times are 7 times, the same plate difference is 9um, and the interlayer resistance is more than or equal to 2180 Ω.mm 2 The welding performance, the plate shape and the punching performance of the sheet are good, and the national standard and the high quality requirement are met.
Example 3
Pouring blast furnace molten iron into a ladle, performing magnesium blowing desulfurization through molten iron pretreatment, pouring the desulfurized molten steel into an oxygen top-bottom composite converting converter, simultaneously adding clean scrap steel accounting for 10 percent of the total weight into the converter, adding limestone and fluorite into the converter in the converting process, adopting a whole-course bottom argon blowing process for the converter, and obtaining the molten steel component [ C ]]≤0.06％，[S]And (2) when the end temperature of the molten steel is 1680 ℃, tapping by fixed oxygen, adding a composite deoxidizer during tapping of the converter, blowing argon in the whole process of tapping of the converter, measuring the temperature of the molten steel after blowing argon, fixing oxygen, and sampling. Feeding aluminum wires into the molten steel according to the oxygen content in the molten steel, and sending the molten steel into a vacuum RH refining furnace for smelting to ensure that the molten steel is of [ C ]]＝0.03％，[Si]＝2.5％，[Mn]＝0.40％，[P]＝0.10％，[S]＝0.003％，[Cu]＝0.20％，[Ni]＝0.16％，[Al]=0.50%, the remainder being Fe and unavoidable impurities (confirmation). The tapping temperature is 1550 ℃, the molten steel is cast into a plate blank with the thickness of 70mm by a thin plate blank continuous casting machine, the drawing speed of the continuous casting machine is 4.5m/min, the temperature of a continuous casting blank entering a furnace is 880 ℃, the temperature of a heating section in the furnace is 1000 ℃, the temperature of a plate blank discharging temperature is 980 ℃, and the temperature of a finish rolling outlet is 860 DEG CThe coiling temperature was 650 ℃, the F1 reduction rate was 51.8%, the F2 reduction rate was 51.0%, the F1 to F4 cumulative reduction rates were 90.1%, and the F7 reduction rate was 7.2%, and hot rolled plate having a thickness of 2.0mm was rolled. The hot rolled plate is pickled by hydrochloric acid with the concentration of 105g/L after the temperature is lower than 60 ℃, the temperature of an acid tank is 90 ℃, and the pickling time is 120 seconds. And (3) removing impurities and iron scales on the surface of the steel coil, carrying out secondary rolling on the steel coil after pickling by a 20-roller Senamil rolling mill, carrying out intermediate decarburization annealing, carrying out primary cold rolling to 0.5mm thick, wherein the total rolling reduction is 75.1%, the first 3-pass rolling reduction is 22.1%, 21.2% and 20.3%, and the last-pass rolling reduction is 2.1%. Then the degreasing is finished, and the steel is put into an annealing furnace for decarburization annealing, and the preheating section and the heating section of the furnace are heated by radiant tubes and are N 2 As a protective gas, the furnace temperature is set to 870 ℃, the decarburization annealing section is heated by resistance to keep the temperature uniform, and 80 percent N is adopted 2 +20％H 2 +0.1％H 2 O is used as a decarburization annealing atmosphere, and the second cold rolling is performed after the decarburization annealing is completed. The total rolling reduction in the second cold rolling is 30.1%, the rolling reduction in the first 3 passes is 14.3%, 12.8% and 10.6%, and the rolling reduction in the last frame is 1.5%. The cold rolling thickness was 0.35mm. And (3) uncoiling the rolled non-oriented electrical steel chilled steel coil, welding by adopting a welding machine, and annealing in an annealing furnace after degreasing. The preheating section and the heating section of the furnace are heated by radiant tubes, and N is adopted 2 As protective gas, the furnace temperature is set to 850 ℃, and the annealing section is heated by resistance to keep the temperature uniform. After the steel strip subjected to heat treatment comes out of the water quenching cooling device, the temperature of the steel strip is adjusted by a water spray cooler, residual moisture on the surface is extruded by a wringing roller, the steel strip dried by a hot air dryer enters a 2-roller coating machine set for coating, the steel strip enters a sintering furnace after the coating, the furnace temperature is set to 450 ℃, and the steel strip is cooled to room temperature by an air jet cooler after being discharged. And (3) coiling with large tension, wherein the coiling tension is 150MPa, and finally performing performance detection, and packaging and warehousing after the detection is qualified.
The method produces the non-oriented electrical steel for the 35WD1600 new energy automobile driving motor, and the product has iron loss P 15/50 2.05W/kg, P 10/400 At 14.6W/kg, minimum magnetic polarization intensity J 5000 1.65T. Compared with the existing cold-rolled non-oriented electrical steel national standard GB/T34215-2017 common 35WD1600 for electric automobile driving, the magnetic induction density is 0.02T and is lower than 1.4W/kg, the electromagnetic performance is better than the national standard, the yield strength is 425MPa, the tensile strength is 530MPa, the elongation is 18%, the bending times are 6 times, the same plate difference is 8 mu m, and the interlayer resistance is not less than 2280 omega-mm 2 The welding performance, the plate shape and the punching performance of the sheet are good, and the national standard and the high quality requirement are met.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these do not affect the effect and practicality of the implementation of the present invention.
Claims (6)
1. The production method of the 35WD1600 electrical steel for the new energy automobile driving motor is characterized by comprising the following steps of:
(1) And (3) molten iron pretreatment: carrying out magnesium blowing desulfurization treatment on molten iron, and pouring the desulfurized molten steel into an oxygen top-bottom composite converting converter;
(2) Smelting in a converter: adding scrap steel into a converter for blowing, then performing oxygen fixation and tapping, adding a composite deoxidizer during tapping, and blowing argon in the whole course; the oxygen content of the oxygen tapping inlet is 400-700ppm, and the oxygen content of the end point is more than 900ppm;
(3) RH refining: molten steel is sent into a vacuum RH refining furnace for smelting, and after preliminary alloying, the argon flow is controlled to be 130-160 m 3 And (h) after the alloy is added, circulating for 2-4min under the extreme vacuum degree, and initially regulating the components;
(4) Continuous casting and rolling: casting the molten steel into a thick plate blank by using a thin plate blank continuous casting machine, and rolling to obtain a hot rolled plate; the thick slab is 70mm, the pulling speed of a continuous casting machine is 3.0-4.5 m/min, the furnace charging temperature of a continuous casting blank is more than or equal to 800 ℃, the rolling mill F1 rolling reduction is more than or equal to 50% during hot rolling, the F2 rolling reduction is more than or equal to 50%, the F1-F4 accumulated rolling reduction is more than or equal to 90%, and the F7 pass rolling reduction is less than or equal to 8%; the thickness of the hot rolled plate is 2.0-3.0 mm;
(5) Acid washing: pickling the hot rolled plate obtained in the step (4) with hydrochloric acid;
(6) First cold rolling and decarburization annealing:rolling the steel strip subjected to acid cleaning in the step (5) by a 20-roll sendzimir mill, and then decarburizing and annealing; the rolling mill rolls for 7 to 9 times, the thickness of a plate blank is 0.50 to 0.60mm, the total rolling reduction rate is less than or equal to 85 percent during rolling, the rolling reduction rate of the first 3 passes is more than or equal to 20 percent, the rolling reduction rate of the last pass is less than or equal to 5 percent, the furnace temperature is 870 to 920 ℃, and the decarburization annealing is performed by 80 to 85 percent of N 2 +15～20％H 2 +0.1～0.5％H 2 O is used as decarburization annealing atmosphere;
(7) Secondary cold rolling and decarburization annealing: carrying out secondary rolling and decarburization annealing on the steel strip obtained in the step (6) by using a 20-roll Send Jimie rolling mill; the rolling mill rolls for 3 to 7 times, the thickness of a plate blank is 0.35 to 0.40mm, the total rolling reduction is more than or equal to 30 percent, the reduction of the first 3 passes is more than or equal to 10 percent, the reduction of the last frame is less than or equal to 5 percent, and the furnace temperature is 850 to 900 ℃;
(8) And (3) coating: the steel strip obtained in the step (7) is discharged from a water quenching cooling device, the temperature of the steel strip is adjusted by a water spray cooler, residual moisture on the surface is extruded by a squeezing roller, and the steel strip is dried by a hot air dryer and then enters a 2-roller coating machine set for coating;
(9) Sintering and coiling: placing the coated steel strip into a sintering furnace for sintering, cooling and coiling; the obtained electrical steel comprises the following chemical element components in percentage by weight: less than or equal to 0.005% of C, 2.5-2.8% of Si, 0.2-0.4% of Mn, 0.08-0.12% of P, less than or equal to 0.008% of S, 0.20-0.30% of Cu, 0.16-0.25% of Ni, 0.3-0.5% of Al, and the balance of Fe and unavoidable impurities.
2. The method for producing 35WD1600 electrical steel for new energy automobile driving motor according to claim 1, wherein in the step (1), KR is adopted to remove S, the sulfur content of molten iron after pretreatment is less than or equal to 0.001%, and the bare area of molten iron is >90%.
3. The method for producing 35WD1600 electrical steel for driving motor of new energy automobile as claimed in claim 1, wherein in said step (2), the total weight of said added scrap steel is 10-18%, and the bottom blowing strength is more than 0.05Nm 3 And (5) at the speed of min, wherein the composite deoxidizer is aluminum iron particles.
4. The method for producing 35WD1600 electrical steel for a new energy vehicle driving motor according to claim 1, wherein in the step (5), the hydrochloric acid concentration is 30 to 150g/L, the acid bath temperature is 60 to 80 ℃, and the pickling time is 60 to 120s.
5. The method for producing 35WD1600 electrical steel for a new energy vehicle according to claim 1, wherein in the step (9), the sintering temperature is 300 to 450 ℃, the coiling tension is 150 to 170MPa, and the coiling temperature is 650 to 680 ℃.
6. A 35WD1600 electrical steel for a new energy vehicle drive motor manufactured by the method according to any one of claims 1 to 5, comprising the following chemical elements in weight percent: less than or equal to 0.005% of C, 2.5-2.8% of Si, 0.2-0.4% of Mn, 0.08-0.12% of P, less than or equal to 0.008% of S, 0.20-0.30% of Cu, 0.16-0.25% of Ni, 0.3-0.5% of Al, and the balance of Fe and unavoidable impurities.
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