CN117107164A - Ultrathin non-oriented silicon steel and preparation method and application thereof - Google Patents
Ultrathin non-oriented silicon steel and preparation method and application thereof Download PDFInfo
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- CN117107164A CN117107164A CN202311392313.1A CN202311392313A CN117107164A CN 117107164 A CN117107164 A CN 117107164A CN 202311392313 A CN202311392313 A CN 202311392313A CN 117107164 A CN117107164 A CN 117107164A
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title abstract description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 73
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 229910052742 iron Inorganic materials 0.000 claims abstract description 33
- 238000005097 cold rolling Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 18
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims description 49
- 238000010438 heat treatment Methods 0.000 claims description 34
- 239000011248 coating agent Substances 0.000 claims description 32
- 238000000576 coating method Methods 0.000 claims description 32
- 238000005266 casting Methods 0.000 claims description 27
- 238000005554 pickling Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
- 238000000137 annealing Methods 0.000 claims description 20
- 238000005098 hot rolling Methods 0.000 claims description 18
- 238000003723 Smelting Methods 0.000 claims description 16
- 238000002791 soaking Methods 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 15
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 14
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 238000009749 continuous casting Methods 0.000 claims description 7
- 150000002431 hydrogen Chemical class 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 6
- 238000010606 normalization Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000004140 cleaning Methods 0.000 description 10
- 239000000306 component Substances 0.000 description 8
- 239000002253 acid Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- 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
-
- 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
- C21D8/1261—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 following hot rolling
-
- 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
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention belongs to the technical field of steel materials, in particular to an ultrathin non-oriented silicon steel, a preparation method and application thereof, wherein the ultrathin non-oriented silicon steel with the thickness of 0.10-0.25 mm can be stably prepared by controlling the preparation processes of component design, normalizing, cold rolling and the like, the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m, and the iron loss P is equal to the iron loss P 1.0/400 Less than or equal to 11.8W/kg, magnetic induction intensity B 5000 The yield strength is more than or equal to 1.67T, the tensile strength is more than or equal to 440MPa, the elongation after breaking is more than or equal to 20 percent, and the method can be used for large-scale industrial production.
Description
Technical Field
The invention relates to the technical field of steel materials, in particular to ultra-thin non-oriented silicon steel and a preparation method and application thereof.
Background
The fuel oil automobile is used as a consumer with high energy consumption, and gradually replaced by a new energy automobile, and the new energy automobile becomes the main stream direction of the development of the automobile industry. The driving motor is used as one of the core components of the new energy automobile, and is required to have the characteristics of miniaturization, high strength and high performance, so the following performance requirements are put forward for the non-oriented silicon steel for preparing the driving motor: high magnetic induction strength, high frequency, low iron loss, better mechanical property and fatigue resistance, better processability and the like. Therefore, the non-oriented silicon steel produced by each steel plant gradually develops to the direction of better magnetic property and thinner thickness, and the same plate difference is required to be smaller than 5 mu m, but the conventional process equipment is adopted to produce long flow, the equipment precision requirement is higher, the production efficiency is lower, or a new production line is required to be built, and the cost is higher.
Disclosure of Invention
In order to solve the problems in the prior art, the main purpose of the invention is to provide ultrathin non-oriented silicon steel and a preparation method and application thereof.
In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided:
the ultra-thin non-oriented silicon steel comprises the following components in percentage by weight: c is less than or equal to 0.0030wt percent, si:3.0 to 3.5wt%, mn: 0.2-0.5wt%, P is less than or equal to 0.020wt%, S is less than or equal to 0.002wt%, als: 0.5-1.0wt% of Cr: 0.02-0.08 wt%, cu: 0.02-0.08 wt%, sn: 0.03-0.10wt% of Ti:0.0015 to 0.0020wt% of Fe and unavoidable impurities in balance; the thickness of the ultrathin non-oriented silicon steel is 0.10-0.25 mm, and the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m.
As a preferable scheme of the ultrathin non-oriented silicon steel, the invention comprises the following steps: iron loss P of ultrathin non-oriented silicon steel 1.0/400 Less than or equal to 11.8W/kg, magnetic induction intensity B 5000 Not less than 1.67T, yield strength not less than 440MPa, tensile strength not less than 550MPa, and elongation after breaking not less than 20%.
In order to solve the above technical problems, according to another aspect of the present invention, the following technical solutions are provided:
the preparation method of the ultrathin non-oriented silicon steel comprises the following steps:
s1, smelting to obtain a casting blank, wherein the equiaxial crystal proportion of the casting blank is more than 50%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 1.8-2.3 mm;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 775-785 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 18-22 hours, and the temperature is reduced to 350 ℃; wherein the heating speed is 160-190 ℃/h, and the cooling speed is 50-60 ℃/h;
s4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.10-0.25 mm, wherein the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m.
As a preferable scheme of the preparation method of the ultrathin non-oriented silicon steel, the invention comprises the following steps: the step S4 further includes: s5, annealing, wherein the annealing soaking temperature is 900-1020 ℃, and the soaking time is 2.0-3.5 min.
As a preferable scheme of the preparation method of the ultrathin non-oriented silicon steel, the invention comprises the following steps: the step S5 further includes: s6, coating a coating, wherein the coating weight of the coating is 2.5-7.0 g/m 2 The drying temperature of the coating is 500-580 ℃.
As a preferable scheme of the preparation method of the ultrathin non-oriented silicon steel, the invention comprises the following steps: in the step S1, a casting blank is obtained through iron making, KR pretreatment, converter smelting, RH refining and continuous casting; the titanium content in the iron water obtained by iron making is less than or equal to 0.050wt%, and the temperature of the iron water is 1340-1380 ℃.
As a preferable scheme of the preparation method of the ultrathin non-oriented silicon steel, the invention comprises the following steps: in the step S2, heating the casting blank in a heating furnace for 240-300 min, wherein the tapping temperature is 1080-1200 ℃; the initial rolling temperature of rough rolling is 1080-1100 ℃; the finish rolling temperature is 1000-1080 ℃, the finish rolling temperature is 840-880 ℃, and the coiling temperature is 580-650 ℃.
As a preferable scheme of the preparation method of the ultrathin non-oriented silicon steel, the invention comprises the following steps: in the step S2, the steel coil after hot rolling is cooled to room temperature and then is pickled.
As a preferable scheme of the preparation method of the ultrathin non-oriented silicon steel, the invention comprises the following steps: in the step S3, the steel coil after pickling is normalized by a bell-type furnace, and is cooled to room temperature after normalization.
In order to solve the above technical problems, according to another aspect of the present invention, the following technical solutions are provided:
the application of the ultrathin non-oriented silicon steel in the field of new energy automobile driving motors.
The beneficial effects of the invention are as follows:
the invention provides an ultrathin non-oriented silicon steel, a preparation method and application thereof, wherein the ultrathin non-oriented silicon steel with the thickness of 0.10-0.25 mm can be stably prepared through component design, normalization, cold rolling and other preparation process controlThe same plate difference of silicon steel is less than 5 mu m, and the iron loss P 1.0/400 Less than or equal to 11.8W/kg, magnetic induction intensity B 5000 The yield strength is more than or equal to 1.67T, the tensile strength is more than or equal to 440MPa, the elongation after breaking is more than or equal to 20 percent, and the method can be used for large-scale industrial production.
Detailed Description
The following description will be made clearly and fully with reference to the technical solutions in the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problems in the prior art, the main purpose of the invention is to provide ultrathin non-oriented silicon steel and a preparation method and application thereof. According to one aspect of the invention, the invention provides the following technical scheme:
the ultra-thin non-oriented silicon steel comprises the following components in percentage by weight: c is less than or equal to 0.0030wt percent, si:3.0 to 3.5wt%, mn: 0.2-0.5wt%, P is less than or equal to 0.020wt%, S is less than or equal to 0.002wt%, als: 0.5-1.0wt% of Cr: 0.02-0.08 wt%, cu: 0.02-0.08 wt%, sn: 0.03-0.10wt% of Ti:0.0015 to 0.0020wt% of Fe and unavoidable impurities in balance; the thickness of the ultrathin non-oriented silicon steel is 0.10-0.25 mm, and the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m. Specifically, the thickness of the ultra-thin non-oriented silicon steel may be, for example, but not limited to, any one or a range between any two of 0.10mm, 0.15mm, 0.20mm, 0.25 mm;
preferably, the iron loss P of the ultrathin non-oriented silicon steel 1.0/400 Less than or equal to 11.8W/kg, magnetic induction intensity B 5000 Not less than 1.67T, yield strength not less than 440MPa, tensile strength not less than 550MPa, and elongation after breaking not less than 20%.
According to another aspect of the invention, the invention provides the following technical scheme:
the preparation method of the ultrathin non-oriented silicon steel comprises the following steps:
s1, smelting to obtain a casting blank, wherein the equiaxial crystal proportion of the casting blank is more than 50%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 1.8-2.3 mm;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 775-785 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 18-22 hours, and the temperature is reduced to 350 ℃; wherein the heating speed is 160-190 ℃/h, and the cooling speed is 50-60 ℃/h;
s4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.10-0.25 mm, wherein the cold rolling is controlled by adopting micro-edge waves, and the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m.
Preferably, the step S4 further includes: s5, annealing, namely mainly passing through a front cleaning section, an annealing furnace and a rear cleaning section. Further preferably, the annealing soaking temperature is 900-1020 ℃, and the soaking time is 2.0-3.5 min. Specifically, the annealing soaking temperature may be, for example, but not limited to, any one or any two of 900 ℃, 910 ℃, 920 ℃, 930 ℃, 940 ℃, 950 ℃, 960 ℃, 970 ℃, 980 ℃, 990 ℃, 1000 ℃, 1010 ℃, 1020 ℃, and the soaking time may be, for example, but not limited to, any one or any two of 2.0min, 2.5min, 3.0min, 3.5min.
Further preferably, the step S5 further includes: s6, coating by using a three-roller single-sided coating machine, wherein the coating amount is 2.5-7.0 g/m 2 The drying temperature of the coating is 500-580 ℃. In particular, the coating amount may be, for example, but not limited to, 2.5g/m 2 、3.0g/m 2 、4.0g/m 2 、5.0g/m 2 、6.0g/m 2 、7.0g/m 2 The coating drying temperature may be, for example, but not limited to, in a range between any one or any two of 500 ℃, 510 ℃, 520 ℃, 530 ℃, 540 ℃, 550 ℃, 560 ℃, 570 ℃, 580 ℃.
Preferably, in the step S1, through iron making, KR pretreatment, converter smelting, RH refining and continuous casting, the content of harmful elements in raw materials and auxiliary materials is strictly required in the smelting process, the temperature, the alloy adding time, the top slag thickness, the protection casting and other key processes and parameters thereof are controlled in the smelting process, the chemical components of the molten steel of the tundish are ensured to meet the requirements, the surface quality of the casting blank is ensured to meet the requirements, and the equiaxial crystal proportion of the casting blank is controlled to be more than 50%; the iron making adopts the inner Mongolia white Yun E blogs, the titanium content in the obtained molten iron is less than or equal to 0.050wt%, and the temperature of the molten iron is 1340-1380 ℃.
Preferably, in the step S2, the hot rolling is performed by a billet warehouse, a step heating furnace, a descaler, a 2-frame rough rolling, a finishing mill, laminar cooling, a coiling machine, and a steel coil warehouse-in, and the rough rolling adopts a 1+3 rolling mode. Heating the casting blank in a heating furnace for 240-300 min, wherein the tapping temperature is 1080-1200 ℃; the initial rolling temperature of rough rolling is 1080-1100 ℃; the finish rolling temperature is 1000-1080 ℃, the finish rolling temperature is 840-880 ℃, and the coiling temperature is 580-650 ℃. Specifically, the heating time of the casting blank in the heating furnace can be, for example and without limitation, any one or any two of 240min, 250min, 260min, 270min, 280min, 290min and 300min, and the tapping temperature can be, for example and without limitation, any one or any two of 1080 ℃, 1090 ℃, 1100 ℃, 1110 ℃, 1120 ℃, 1130 ℃, 1140 ℃, 1150 ℃, 1160 ℃, 1170 ℃, 1180 ℃, 1190 ℃ and 1200 ℃; the rough rolling start temperature may be, for example, but not limited to, any one or a range between any two of 1080 ℃, 1085 ℃, 1090 ℃, 1095 ℃, 1100 ℃; the finish rolling start temperature may be, for example, but not limited to, any one or a range between any two of 1000 ℃, 1010 ℃, 1020 ℃, 1030 ℃, 1040 ℃, 1050 ℃, 1060 ℃, 1070 ℃, 1080 ℃; the finish rolling finishing temperature may be, for example, but not limited to, any one or any two of 840 ℃, 850 ℃, 860 ℃, 870 ℃, 880 ℃, and the coiling temperature may be, for example, but not limited to, any one or any two of 580 ℃, 590 ℃, 600 ℃, 610 ℃, 620 ℃, 630 ℃, 640 ℃, 650 ℃; the thickness of the steel coil is any one or the range between any two of 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm and 2.3 mm.
Preferably, in the step S2, the steel coil is pickled after being cooled to room temperature after hot rolling. And after the hot rolled steel coil is cooled to room temperature, pickling is performed in a pickling unit, and the temperature and the concentration of the acid liquor ensure that the oxidized iron scales on the surface of the steel belt are completely washed. The steel coil speed of the pickling process section is 60-70 m/min, and the steel coil is coiled without oiling after the edge is cut after pickling.
Preferably, in the step S3, the steel coil after pickling is normalized by a bell-type furnace, and cooled to room temperature after normalization. Specifically, the normalizing treatment and heat preservation temperature of the steel coil can be, for example, but not limited to, any one or a range between any two of 775 ℃, 780 ℃ and 785 ℃; the total time of the heating, holding and cooling phases of the normalizing process may be, for example, but not limited to, a range between any one or any two of 18, 19, 20, 21, 22 hours, the heating rate may be, for example, but not limited to, a range between any one or any two of 160, 170, 180, 190, and the cooling rate may be, for example, but not limited to, a range between any one or any two of 50, 55, 60;
according to another aspect of the invention, the invention provides the following technical scheme:
the application of the ultrathin non-oriented silicon steel in the field of new energy automobile driving motors.
The technical scheme of the invention is further described below by combining specific embodiments.
Example 1
The ultra-thin non-oriented silicon steel comprises the following components in percentage by weight: c:0.0022wt%, si:3.22wt%, mn:0.26wt%, P:0.018wt%, S:0.0009wt%, als:0.86wt%, cr:0.05wt%, cu:0.06wt%, sn:0.07wt%, ti:0.0015wt%, the balance being Fe and unavoidable impurities.
The preparation method of the ultrathin non-oriented silicon steel comprises the following steps:
s1, smelting, namely obtaining a casting blank through iron making, KR pretreatment, converter smelting, RH refining and continuous casting, wherein the equiaxial crystal proportion of the casting blank is 56%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 2.2mm; heating the casting blank in a heating furnace for 265min, wherein the tapping temperature is 1090 ℃; the initial rolling temperature of rough rolling is 1080 ℃; the initial rolling temperature of the finish rolling is 1040 ℃, the final rolling temperature of the finish rolling is 865 ℃, and the coiling temperature is 620 ℃; and after the hot rolled steel coil is cooled to room temperature, pickling is performed in a pickling unit, and the temperature and the concentration of the acid liquor ensure that the oxidized iron scales on the surface of the steel belt are completely washed. The steel coil speed of the pickling process section is 60m/min, and the steel coil is coiled without oiling after being subjected to edge cutting after pickling;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 775 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 20 hours; heating at 180 ℃/h, cooling at 60 ℃/h, cooling to 350 ℃ and discharging.
S4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.25mm, wherein the cold rolling is controlled by adopting micro-edge waves, and the same plate difference of the ultrathin non-oriented silicon steel is less than 4 mu m.
S5, annealing, namely mainly passing through a front cleaning section, an annealing furnace and a rear cleaning section, wherein the annealing soaking temperature is 980 ℃, and the soaking time is 3.0min.
S6, coating by using a three-roller single-sided coating machine, wherein the coating amount is 3.5g/m 2 The coating drying temperature was 540 ℃.
Performance test is carried out on the ultrathin non-oriented silicon steel prepared by the embodiment, and the iron loss P of the ultrathin non-oriented silicon steel 1.0/400 11.80W/kg, magnetic induction B 5000 1.67T, 452MPa yield strength, 560MPa tensile strength and 20.0% elongation after breaking.
Example 2
The ultra-thin non-oriented silicon steel comprises the following components in percentage by weight: c:0.0020wt%, si:3.30wt%, mn:0.25wt%, P:0.020wt%, S:0.0011wt%, als:0.84wt%, cr:0.04wt%, cu:0.06wt%, sn:0.06wt%, ti:0.0018 wt.%, balance Fe and unavoidable impurities.
The preparation method of the ultrathin non-oriented silicon steel comprises the following steps:
s1, smelting, namely obtaining a casting blank through iron making, KR pretreatment, converter smelting, RH refining and continuous casting, wherein the equiaxial crystal proportion of the casting blank is 55%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 2.3mm; heating the casting blank in a heating furnace for 270min, wherein the tapping temperature is 1120 ℃; the initial rolling temperature of rough rolling is 1090 ℃; the initial rolling temperature of the finish rolling is 1020 ℃, the final rolling temperature of the finish rolling is 860 ℃, and the coiling temperature is 610 ℃; and after the hot rolled steel coil is cooled to room temperature, pickling is performed in a pickling unit, and the temperature and the concentration of the acid liquor ensure that the oxidized iron scales on the surface of the steel belt are completely washed. The steel coil speed of the pickling process section is 70m/min, and the steel coil is coiled without oiling after being subjected to edge cutting after pickling;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 780 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 22 hours; heating at 160 ℃/h, cooling at 50 ℃/h, cooling to 350 ℃ and discharging.
S4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.25mm, wherein the cold rolling is controlled by adopting micro-edge waves, and the same plate difference of the ultrathin non-oriented silicon steel is less than 4 mu m.
S5, annealing, namely mainly passing through a front cleaning section, an annealing furnace and a rear cleaning section, wherein the annealing soaking temperature is 900 ℃, and the soaking time is 3.5min.
S6, coating by using a three-roller single-sided coating machine, wherein the coating amount is 3.0g/m 2 The coating drying temperature was 530 ℃.
Performance test is carried out on the ultrathin non-oriented silicon steel prepared by the embodiment, and the iron loss P of the ultrathin non-oriented silicon steel 1.0/400 11.75W/kg, magnetic induction B 5000 1.68T, 440MPa yield strength, 550MPa tensile strength, and 21.0% elongation after breaking.
Example 3
The ultra-thin non-oriented silicon steel comprises the following components in percentage by weight: c:0.0020wt%, si:3.28wt%, mn:0.24wt%, P:0.015wt%, S:0.0012wt%, als:0.88wt%, cr:0.05wt%, cu:0.05wt%, sn:0.06wt%, ti:0.0020 wt.%, balance Fe and unavoidable impurities.
The preparation method of the ultrathin non-oriented silicon steel comprises the following steps:
s1, smelting, namely obtaining a casting blank through iron making, KR pretreatment, converter smelting, RH refining and continuous casting, wherein the equiaxial crystal proportion of the casting blank is 58%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 2.0mm; heating the casting blank in a heating furnace for 256min, wherein the tapping temperature is 1125 ℃; the initial rolling temperature of rough rolling is 1100 ℃; the initial rolling temperature of the finish rolling is 1080 ℃, the final rolling temperature of the finish rolling is 866 ℃, and the coiling temperature is 625 ℃; and after the hot rolled steel coil is cooled to room temperature, pickling is performed in a pickling unit, and the temperature and the concentration of the acid liquor ensure that the oxidized iron scales on the surface of the steel belt are completely washed. The steel coil speed of the pickling process section is 70m/min, and the steel coil is coiled without oiling after being subjected to edge cutting after pickling;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 785 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 22 hours; heating at 180 ℃/h, cooling at 55 ℃/h, cooling to 350 ℃ and discharging.
S4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.20mm, wherein the cold rolling is controlled by adopting micro-edge waves, and the same plate difference of the ultrathin non-oriented silicon steel is less than 4 mu m.
S5, annealing, namely mainly passing through a front cleaning section, an annealing furnace and a rear cleaning section, wherein the annealing soaking temperature is 1020 ℃, and the soaking time is 2.0min.
S6, coating by using a three-roller single-sided coating machine, wherein the coating amount is 3.0g/m 2 The coating drying temperature was 530 ℃.
Performance test is carried out on the ultrathin non-oriented silicon steel prepared by the embodiment, and the iron loss P of the ultrathin non-oriented silicon steel 1.0/400 10.82W/kg, magnetic induction B 5000 1.67T, 453MPa of yield strength, 558MPa of tensile strength and 20.6% of elongation after breaking.
Example 4
The ultra-thin non-oriented silicon steel comprises the following components in percentage by weight: c:0.0018wt%, si:3.32wt%, mn:0.28wt%, P:0.016wt%, S:0.0011wt%, als:0.85wt%, cr:0.05wt%, cu:0.06wt%, sn:0.06wt%, ti:0.0019 wt.%, balance Fe and unavoidable impurities.
The preparation method of the ultrathin non-oriented silicon steel comprises the following steps:
s1, smelting, namely obtaining a casting blank through iron making, KR pretreatment, converter smelting, RH refining and continuous casting, wherein the equiaxial crystal proportion of the casting blank is 58%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 1.8mm; heating the casting blank in a heating furnace for 256min, wherein the tapping temperature is 1120 ℃; the initial rolling temperature of rough rolling is 1080; the initial rolling temperature of the finish rolling is 1000 ℃, the final rolling temperature of the finish rolling is 860 ℃, and the coiling temperature is 628 ℃; and after the hot rolled steel coil is cooled to room temperature, pickling is performed in a pickling unit, and the temperature and the concentration of the acid liquor ensure that the oxidized iron scales on the surface of the steel belt are completely washed. The steel coil speed of the pickling process section is 70m/min, and the steel coil is coiled without oiling after being subjected to edge cutting after pickling; heating the casting blank in a heating furnace for 240-300 min, wherein the tapping temperature is 1080-1200 ℃;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 780 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 21h; heating at a speed of 190 ℃/h, cooling at a speed of 60 ℃/h, cooling to 350 ℃ and discharging.
S4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.20mm, wherein the cold rolling is controlled by adopting micro-edge waves, and the same plate difference of the ultrathin non-oriented silicon steel is less than 4 mu m.
S5, annealing, namely mainly passing through a front cleaning section, an annealing furnace and a rear cleaning section, wherein the annealing soaking temperature is 1000 ℃, and the soaking time is 2.5min.
S6, coating by using a three-roller single-sided coating machine, wherein the coating amount is 3.0g/m 2 The coating drying temperature was 520 ℃.
Performance test is carried out on the ultrathin non-oriented silicon steel prepared by the embodiment, and the iron loss P of the ultrathin non-oriented silicon steel 1.0/400 10.95W/kg magnetic induction B 5000 1.68T, 451MPa of yield strength, 560MPa of tensile strength and 21.1% of elongation after breaking.
As can be seen from the examples of the present invention, the present invention is provided by the compositionsThe design, normalization, cold rolling and other preparation process control can stably prepare the ultrathin non-oriented silicon steel with the thickness of 0.10-0.25 mm, the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m, and the iron loss P is less than 5 mu m 1.0/400 Less than or equal to 11.8W/kg, magnetic induction intensity B 5000 The yield strength is more than or equal to 1.67T, the tensile strength is more than or equal to 440MPa, the elongation after breaking is more than or equal to 20 percent, and the method can be used for large-scale industrial production.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the content of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The ultrathin non-oriented silicon steel is characterized by comprising the following components in percentage by weight: c is less than or equal to 0.0030wt percent, si:3.0 to 3.5wt%, mn: 0.2-0.5wt%, P is less than or equal to 0.020wt%, S is less than or equal to 0.002wt%, als: 0.5-1.0wt% of Cr: 0.02-0.08 wt%, cu: 0.02-0.08 wt%, sn: 0.03-0.10wt% of Ti:0.0015 to 0.0020wt% of Fe and unavoidable impurities in balance; the thickness of the ultrathin non-oriented silicon steel is 0.10-0.25 mm, and the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m.
2. The ultra-thin non-oriented silicon steel as claimed in claim 1, wherein the ultra-thin non-oriented silicon steel has an iron loss P of 1.0/400 Less than or equal to 11.8W/kg, magnetic induction intensity B 5000 Not less than 1.67T, yield strength not less than 440MPa, tensile strength not less than 550MPa, and elongation after breaking not less than 20%.
3. A method for preparing the ultra-thin non-oriented silicon steel as claimed in claim 1 or 2, comprising the steps of:
s1, smelting to obtain a casting blank, wherein the equiaxial crystal proportion of the casting blank is more than 50%;
s2, hot rolling, and coiling after hot rolling to obtain a steel coil, wherein the thickness of the steel coil is 1.8-2.3 mm;
s3, normalizing, wherein the temperature of the normalizing treatment and heat preservation of the steel coil is 775-785 ℃, the atmosphere of normalizing treatment is nitrogen and hydrogen, and the volume ratio of the nitrogen to the hydrogen is 7:3, a step of; the total time of the heating, heat preservation and cooling stages of the normalizing treatment is 18-22 hours, and the temperature is reduced to 350 ℃; wherein the heating speed is 160-190 ℃/h, and the cooling speed is 50-60 ℃/h;
s4, cold rolling, namely cold rolling the normalized steel coil by using a 7-frame cold continuous rolling machine to obtain the ultrathin non-oriented silicon steel with the thickness of 0.10-0.25 mm, wherein the same plate difference of the ultrathin non-oriented silicon steel is less than 5 mu m.
4. The method for preparing ultra-thin non-oriented silicon steel as claimed in claim 3, wherein the step S4 further comprises: s5, annealing, wherein the annealing soaking temperature is 900-1020 ℃, and the soaking time is 2.0-3.5 min.
5. The method for preparing ultra-thin non-oriented silicon steel as claimed in claim 4, wherein the step S5 further comprises: s6, coating a coating, wherein the coating weight of the coating is 2.5-7.0 g/m 2 The drying temperature of the coating is 500-580 ℃.
6. The method for preparing ultra-thin non-oriented silicon steel according to claim 3, wherein in the step S1, a cast blank is obtained through iron making, KR pretreatment, converter smelting, RH refining and continuous casting; the titanium content in the iron water obtained by iron making is less than or equal to 0.050wt%, and the temperature of the iron water is 1340-1380 ℃.
7. The method for preparing ultra-thin non-oriented silicon steel according to claim 3, wherein in the step S2, the casting blank is heated in a heating furnace for 240-300 min, and the tapping temperature is 1080-1200 ℃; the initial rolling temperature of rough rolling is 1080-1100 ℃; the finish rolling temperature is 1000-1080 ℃, the finish rolling temperature is 840-880 ℃, and the coiling temperature is 580-650 ℃.
8. The method for producing ultra-thin non-oriented silicon steel according to claim 3, wherein in the step S2, the steel coil is pickled after being cooled to room temperature after hot rolling.
9. The method for producing ultra-thin non-oriented silicon steel according to claim 3, wherein in the step S3, the steel coil is normalized by a bell-type furnace after pickling, and cooled to room temperature after normalization.
10. An application of the ultrathin non-oriented silicon steel in the field of new energy automobile driving motors.
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