CN113913694B - CSP process produced efficient cold-rolled non-oriented electrical steel and production method - Google Patents
CSP process produced efficient cold-rolled non-oriented electrical steel and production method Download PDFInfo
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Abstract
The invention provides a CSP process for producing high-efficiency cold-rolled non-oriented electrical steel and a production method thereof, and the components are as follows: less than or equal to 0.0030 percent of C, 1.00 to 1.70 percent of Si, less than or equal to 0.0050 percent of Als, 0.10 to 0.30 percent of Mn, 0.01 to 0.3 percent of Sn0, less than or equal to 0.050 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0030 percent of N, less than or equal to 0.0030 percent of Nb, less than or equal to 0.0030 percent of V, less than or equal to 0.0030 percent of Ti, and the balance of Fe and inevitable impurities. Compared with the prior art, the method for producing the high-efficiency cold-rolled non-oriented electrical steel by the CSP process realizes excellent surface quality, low iron loss, high magnetic induction, low manufacturing cost and high production efficiency by controlling chemical components in the steel and adopting a proper production process.
Description
Technical Field
The invention belongs to the technical field of non-oriented electrical steel production, and particularly relates to high-efficiency cold-rolled non-oriented electrical steel produced by a CSP (compact strip production) process and a production method thereof.
Background
The cold-rolled non-oriented electrical silicon steel is an important electromagnetic material for manufacturing various motors and generators, in particular to a cold-rolled non-oriented electrical steel product with low iron loss and high magnetic induction, which is more in line with the strategic direction of national energy efficiency upgrade and is the development direction of future electrical steel products. At present, the mainstream production process of low-grade electrical steel mainly comprises thin slab continuous casting and rolling (CSP) and conventional hot charging and hot delivery rolling. The CSP technology has shorter production flow and lower energy consumption, but the magnetic performance of the produced electrical steel product cannot meet the requirements of low iron loss and high magnetic induction in the market. The conventional hot charging and hot delivery rolling technology has the defects of long production line and production period and high production cost.
At present, the prior art discloses the following technologies for domestic high-efficiency non-oriented silicon steel with low iron loss and high magnetic induction:
a Chinese patent published in 2013, 8, 28, and the application number is 201310201110.X, and the application publication number is CN103266266A, which disclose "low-grade non-oriented silicon steel produced by a thin slab continuous casting and rolling process and a preparation method thereof", C:0.001% -0.008%, si:1.10% -1.70%, al:0.20% -1.0%, mn:0.20% -1.0%, P: 0.02-0.10 percent of iron, less than or equal to 0.005 percent of N, less than or equal to 0.005 percent of S, and the balance of iron and inevitable impurities; the composition proportion ensures that 10 to 30 percent of austenite phase exists in the steel at 1100 ℃, and the steel is smelted and secondarily refined; continuous casting adopts a liquid core pressing process and uniform heating; hot rolling; acid pickling and cold rolling; annealing; and (4) coating an insulating coating. The thickness of the produced finished product is 0.50mm, the iron loss P1.5/50 is 3.25-3.56W/kg, the magnetic induction B5000 is 1.70-1.75T, and the surface of the product has no corrugated defects. The method has strict requirements on the volume content of gamma 1100 ℃, and the adopted liquid core reduction process reduces the thickness of a casting blank from 70-90mm at the outlet of the crystallizer to 50-60mm, improves the isometric crystal ratio, reduces the corrugated defects, but is easy to produce steel leakage in the actual production process to cause production accidents.
Chinese patent publication No. 202010344453.1 and publication No. CN111471927A, published as "a high magnetic induction non-oriented silicon steel for automobile generator and its preparation method", on 31/7/2020, si:0.6-1.6%, mn:0.10-0.65%, P:0.04-0.10%, als is less than or equal to 0.008%, sn:0.01 to 0.10 percent, less than or equal to 100ppm of [ S + C + O + N + Ti ], and less than or equal to 25ppm of each element. The iron loss P1.5/50 of the finished product is less than or equal to 4.50W/kg, and the magnetic induction B50 is more than or equal to 1.74T. The method adopts the components without aluminum and Sn, strictly controls the contents of C, S, O, N and Ti and all elements, and ensures the magnetic property of the final product through optimization of components and process design. However, this patent does not clearly control the finish rolling and curling processes of hot rolling, and fails to sufficiently release the magnetic properties of the composition system. Meanwhile, the finished product can have corrugated defects.
Chinese patent publication No. 202010214531.6 and publication No. CN111349861A, published in 6/30/2020, "a high magnetic induction non-oriented silicon steel for EI sheet in CSP process and its production method". Through the aluminum-containing low-impurity element components and the optimization of process design, the CSP process can be used for stably producing the non-oriented silicon steel with high magnetic induction and low iron loss in batches. The patent mainly adopts low-temperature heating of a casting blank to prevent precipitates such as Al, N, mn, S and the like from being dissolved in solid, and hot rolling is carried out in a two-phase region to improve the magnetic property of a finished product. The invention aims at the silicon steel, austenite to ferrite phase transformation occurs during hot rolling, but for example, the silicon steel does not have the austenite to ferrite phase transformation process during the hot rolling. The principles of the patented method are not applicable.
In a method for producing non-oriented electrical steel by continuous casting and rolling of thin slabs, disclosed in China patent publication No. CN111531138A, no. 202010523771.4, which is published on 8/14/2020/8/4, the size of columnar crystals of a casting blank (slab) is controlled during continuous casting, and a higher finish rolling temperature is adopted during finish rolling, so that a hot rolled plate structure can be crushed through sufficient dynamic recrystallization; and high-temperature coiling is adopted during coiling, so that a more uniform hot-rolled recrystallization structure with coarser grains is obtained, and the corrugated defect caused by a fiber structure generated by incomplete recrystallization is avoided. The corrugated defect control method is mainly used for controlling corrugated defects of aluminum-medium-grade silicon steel (Si content is more than 1.3%, als content is more than 0.3%), and is not strong in applicability to low-grade aluminum-free silicon steel.
Disclosure of Invention
The invention provides a high-efficiency cold-rolled non-oriented electrical steel produced by a CSP process and a production method thereof.
The specific technical scheme of the invention is as follows:
the high-efficiency cold-rolled non-oriented electrical steel produced by the CSP process comprises the following components in percentage by mass:
less than or equal to 0.0030 percent of C, 1.00 to 1.70 percent of Si, less than or equal to 0.0050 percent of Als, 0.10 to 0.30 percent of Mn, 0.01 to 0.3 percent of Sns, less than or equal to 0.050 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0030 percent of N, less than or equal to 0.0030 percent of Nb, less than or equal to 0.0030 percent of V, less than or equal to 0.0030 percent of Ti, and the balance of Fe and inevitable impurities.
The invention provides a production method for producing high-efficiency cold-rolled non-oriented electrical steel by a CSP (cast steel plate) process, which comprises the following steps of:
1) Desulfurizing the molten iron KR;
2) Converter steelmaking;
3) RH vacuum refining
4) Continuous casting;
5) Heating a casting blank;
6) Hot continuous rolling;
7) Acid washing;
8) And (6) annealing.
In the step 1), the molten iron KR is desulfurized, the S content in the molten iron is less than or equal to 0.050%, the Nb content is less than or equal to 0.003%, the V content is less than or equal to 0.08%, the Ti content is less than or equal to 0.12%, the temperature of the molten iron is more than or equal to 1350 ℃, the S content in the molten iron after KR desulfurization is less than or equal to 0.0015%, and the temperature of the molten iron is more than or equal to 1250 ℃.
In the step 2), the steel is smelted by the converter, the tapping temperature is 1660 +/-20 ℃, the content of C at the end point of the converter is 0.02-0.05%, and the content of S is less than or equal to 0.0030%;
the RH vacuum refining in the step 3) is carried out, and the tapping temperature is 1584 +/-8 ℃;
the continuous casting specific process in the step 4) comprises the following steps: the thickness of the continuous casting blank is 60-90mm, and the pulling speed is 3-4.5m/min; the water flow of the first section of the continuous casting sector section is controlled to be 3000-4000L/min, the water flow of the second section is controlled to be 1200-2200L/min, the water flow of the third section is controlled to be 800-1400L/min, and the water flow of the fourth section is controlled to be 450-500L/min.
Step 5) the casting blank heating means that the slab directly enters a heating furnace for heating, the temperature of the heating furnace is controlled to be 1050-1300 ℃, and the heating time is 0.4-1.5h;
hot continuous rolling is carried out in the step 6), a hot coil is formed through the hot continuous rolling, the finish rolling temperature is 830-920 ℃, and the coiling temperature is 580-720 ℃;
step 7) pickling, namely removing iron oxide scales on the surface of the hot coil by pickling, and pickling by hydrochloric acid at the temperature of 60-90 ℃;
step 8), annealing, namely annealing in a continuous horizontal annealing furnace, wherein the heating rate is more than 120 ℃/s, the annealing soaking temperature is 800-950 ℃, the soaking and heat preservation time is 1-4min, the volume content of hydrogen in the furnace is more than or equal to 5 percent, and the dew point is less than or equal to 30 ℃;
finally, annealing the strip steel to obtain a finished product after the insulating coating.
As a preferred scheme I, the CSP process for producing the high-efficiency cold-rolled non-oriented electrical steel comprises the following components in percentage by mass: c:0.0020%, si:1.20%, mn:0.25%, P:0.015%, als: less than or equal to 0.002%, sn:0.10 percent; s:0.0016%, N:0.0016%, nb:0.0020%, V:0.002%, ti:0.0020 percent, and the balance of Fe and inevitable impurities. In the production, the water flow of the first section of the continuous casting fan section is controlled to be 3000-4000L/min, the water flow of the second section is controlled to be 1200-2200L/min, the water flow of the third section is controlled to be 800-1400L/min, and the water flow of the fourth section is controlled to be 450-500L/min.
As a preferred scheme II, the CSP process for producing the high-efficiency cold-rolled non-oriented electrical steel comprises the following components in percentage by mass: c:0.0018%, si:1.10%, mn:0.25%, P:0.015%, als: less than or equal to 0.002%, sn:0.08%; s:0.0016%, N:0.0016%, nb:0.0020%, V:0.002%, ti:0.0020 percent, and the balance of Fe and inevitable impurities. In the production, the water flow of the first section of the continuous casting fan-shaped section is controlled to be 3000-4000L/min, the water flow of the second section is controlled to be 1200-2200L/min, the water flow of the third section is controlled to be 800-1400L/min, and the water flow of the fourth section is controlled to be 450-500L/min.
As a third preferred scheme, the CSP process for producing the high-efficiency cold-rolled non-oriented electrical steel comprises the following components in percentage by mass: c:0.0018%, si:1.30%, mn:0.30%, P:0.015%, als: less than or equal to 0.002%, sn:0.12 percent; s:0.0016%, N:0.0016%, nb:0.0020%, V:0.002%, ti:0.0020% and the balance of Fe and unavoidable impurities. In the production, the water flow of the first section of the continuous casting fan section is controlled to be 3000-4000L/min, the water flow of the second section is controlled to be 1200-2200L/min, the water flow of the third section is controlled to be 800-1400L/min, and the water flow of the fourth section is controlled to be 450-500L/min.
The finished cold-rolled non-oriented electrical steel product obtained by the invention has excellent magnetic performance, the grain size of the finished steel strip with the thickness of 0.5mm is 55-60 mu m, the structure is ferrite, and the iron loss P is 1.5/50 Less than or equal to 4.40W/kg, and magnetic induction B 5000 Not less than 1.76T and no corrugation defect.
According to the invention, sn is added in CSP-based production process component control, and the Sn is segregated with MnS and AlS of second phase particles at a matrix interface, so that nucleation and growth of {111} components at a crystal boundary are inhibited, the second phase particles are finer and dispersed, and normal growth of crystal grains is inhibited. High-temperature annealing to obtain a secondary recrystallized structure of {110} <001>, so that the orientation degree and the magnetic property of the silicon steel are greatly improved. However, when the content is too high (> 0.30%), the cold rolling is liable to cause cracking, which makes the rolling difficult. Therefore, the invention requires that the Sn content is controlled between 0.01 and 0.30 percent. Controlling the cooling process of the continuous casting fan-shaped section, wherein the water flow of the first section is controlled to be 3000-4000L/min, the water flow of the second section is controlled to be 1200-2200L/min, the water flow of the third section is controlled to be 800-1400L/min, and the water flow of the fourth section is controlled to be 450-500L/min. Through proper matching of the continuous casting pulling speed and the cooling rate, the generation of compact columnar crystals due to strong cooling of a casting blank is avoided. The process ensures that the columnar crystals of the casting blank are not dense and loose, and solves the problem that the sheet billet produced silicon steel is easy to generate the corrugation mark defect. And controlling a continuous annealing process, controlling the soaking temperature to be 800-950 ℃, soaking and preserving heat for 1-4min, ensuring that the hydrogen content in the furnace is more than or equal to 5 percent, the dew point is less than or equal to 30 ℃, ensuring that the crushed crystal grains grow rapidly after cold rolling, and achieving the purpose of reducing the iron loss of the final product.
Compared with the prior art, the method for producing the high-efficiency cold-rolled non-oriented electrical steel by the CSP process realizes excellent surface quality, low iron loss, high magnetic induction, low manufacturing cost and high production efficiency by controlling chemical components in the steel and matching with the key continuous casting drawing speed and cooling process, hot rolling finishing temperature and coiling temperature control, continuous annealing temperature control and furnace atmosphere control production process.
Drawings
FIG. 1 is a metallographic picture (100 times) of a hot coil of low-grade non-oriented electrical steel according to example 1 of the present invention;
FIG. 2 is a metallographic picture (500 times) of a low-grade nonoriented electrical steel hot-rolled coil according to example 1 of the present invention;
FIG. 3 is a metallographic picture (100 times) of a finished roll of low-grade non-oriented electrical steel of sample No. 1 in example 1 of the present invention;
FIG. 4 is a metallographic picture (100 times) of a finished sample 2 low-grade nonoriented electrical steel coil of example 1 in accordance with the invention;
FIG. 5 is a metallographic picture (100 times) of a finished roll of low grade non-oriented electrical steel in comparative example 1;
FIG. 6 is a metallographic picture (500 times) of a finished roll of low grade non-oriented electrical steel in comparative example 1;
FIG. 7 shows the surface quality of the finished product of example 1;
FIG. 8 shows the surface quality of the finished product of comparative example 2;
FIG. 9 shows a cast slab macrostructure in example 1 of the present invention;
FIG. 10 shows a cast slab low-quality structure in comparative example 2.
Detailed Description
Example 1
The high-efficiency cold-rolled non-oriented electrical steel produced by the CSP process comprises the following components in percentage by mass: as shown in table 2, the balance not shown in table 2 is Fe and inevitable impurities.
The production method for producing the high-efficiency cold-rolled non-oriented electrical steel by the CSP process in the embodiment 1 comprises the following process flows of:
firstly, performing molten iron pretreatment, then smelting in a converter, performing ladle argon blowing and RH vacuum treatment, entering a sheet billet for continuous casting, soaking in a tunnel furnace, and then entering a 7-stand continuous rolling unit for rolling; hot rolling the thin slab to obtain a hot rolled plate with the thickness of 2.3 mm; the hot rolled plate is pickled, cold rolled, annealed and coated to produce a low-grade electrical steel strip product with the thickness of 0.5 mm.
The specific process parameters are as follows:
KR desulfuration is carried out on molten iron, wherein the S content in the used molten iron is 0.040 percent, the Nb content is 0.003 percent, the V content is 0.06 percent, the Ti content is 0.11 percent, the temperature of the molten iron is 1380 ℃, the S content in the molten iron after KR desulfuration is 0.0012 percent, and the temperature of the molten iron is 1270 ℃;
the steel is smelted by a converter, the tapping temperature is 1660 ℃, the content of C at the end point of the converter is 0.02 percent, and the content of S is 0.0015 percent;
RH vacuum refining, tapping temperature is 1584 ℃;
the thickness of a continuous casting blank is 75mm, the pulling speed is 3.5m/min, the first section water flow of the continuous casting fan-shaped section is controlled to be 3600L/min, the second section is controlled to be 1400L/min, the third section is controlled to be 1000L/min, and the fourth section is controlled to be 460L/min, so that the problem that the corrugated mark defect is easily generated in the production of silicon steel by using a thin slab is solved; the water flow parameters of the continuous casting sector section are shown in a table 4;
directly heating the plate blank in a heating furnace, wherein the temperature of the heating furnace is controlled at 1080 ℃, and the heating time is 1.0h;
hot rolling to form a hot coil, wherein the finishing temperature is 890 ℃, and the coiling temperature is 670 ℃;
removing oxidized iron scales and the like on the surface of the hot coil by acid cleaning, and acid cleaning by hydrochloric acid at the temperature of 80 ℃;
after pickling, the hot rolled plate is cold rolled for 5 times to be 0.5mm thick, and the total rolling reduction rate is 78%;
annealing the coating in a continuous horizontal annealing furnace, wherein the heating rate is more than 120 ℃/s, the annealing soaking temperature is 880 ℃, the soaking and heat preservation time is 2.5min, the volume content of hydrogen in the furnace is 8 percent, the dew point is 30 ℃, and the annealed strip steel is subjected to insulation coating to obtain a finished product.
The low-grade cold-rolled non-oriented electrical steel plate manufactured by the process has no corrugated mark defect on the surface, good surface quality and finished product iron loss P 1.5/50 4.27W/kg, magnetic induction B 5000 1.765T, excellent magnetic performance.
Example 2
The high-efficiency cold-rolled non-oriented electrical steel produced by the CSP process comprises the following components in percentage by mass: as shown in table 2, the balance not shown in table 2 is Fe and inevitable impurities.
The production method for producing the high-efficiency cold-rolled non-oriented electrical steel by the CSP process in the embodiment 2 comprises the following process flows of:
firstly, performing molten iron pretreatment, then smelting in a converter, performing ladle argon blowing and RH vacuum treatment, entering a sheet billet for continuous casting, soaking in a tunnel furnace, and then entering a 7-stand continuous rolling unit for rolling; hot rolling the thin slab to obtain a hot rolled plate with the thickness of 2.3 mm; the hot rolled plate is pickled, cold rolled, annealed and coated to produce a low-grade electrical steel strip product with the thickness of 0.5 mm.
The specific process parameters are as follows:
KR desulfuration is carried out on molten iron, wherein the S content in the used molten iron is 0.040 percent, the Nb content is 0.003 percent, the V content is 0.05 percent, the Ti content is 0.12 percent, the temperature is 1360 ℃, the S content in the molten iron after KR desulfuration is 0.0012 percent, and the temperature is 1260 ℃;
converter steelmaking, wherein the tapping temperature is 1670 ℃, the converter end point C content is 0.02 percent, and the S content is 0.0020 percent;
RH vacuum refining, tapping temperature is 1580 ℃;
the thickness of a continuous casting blank is 70mm, the pulling speed is 3.5m/min, the water flow of a first section of a continuous casting fan-shaped section is controlled to be 3500L/min, the water flow of a second section is controlled to be 1500L/min, the water flow of a third section is controlled to be 1000L/min, and the water flow of a fourth section is controlled to be 460L/min, so that the problem that the corrugated mark defect is easily generated in the production of silicon steel by using a thin slab is solved; the water flow parameters of the continuous casting sector section are shown in a table 4;
the plate blank directly enters a heating furnace for heating, the temperature of the heating furnace is controlled at 1080 ℃, and the heating time is 1.0h;
hot continuous rolling is carried out to form a hot coil, wherein the finishing rolling temperature is 880 ℃, and the coiling temperature is 670 ℃;
removing oxide scales and the like on the surface of the hot coil by acid washing, and acid washing by hydrochloric acid at the temperature of 80 ℃;
and annealing the annealing coating in a continuous horizontal annealing furnace, wherein the heating rate is 130 ℃/s, the annealing soaking temperature is 870 ℃, the soaking and heat preservation time is 2.5min, the volume content of hydrogen in the furnace is 8 percent, the dew point is 30 ℃, and the annealed strip steel is subjected to insulation coating to obtain a finished product.
The low-grade cold-rolled non-oriented electrical steel plate prepared by the process has no defects such as corrugation mark and the like on the surface, good surface quality and iron loss P of a finished product 1.5/50 4.25W/Kg, magnetic induction B 5000 1.762T, the magnetic property is excellent.
Example 3
The high-efficiency cold-rolled non-oriented electrical steel produced by the CSP process comprises the following components in percentage by mass: as shown in table 2, the balance not shown in table 2 is Fe and inevitable impurities.
The production method for producing the high-efficiency cold-rolled non-oriented electrical steel by the CSP process comprises the following process flows of:
firstly, performing molten iron pretreatment, then smelting in a converter, performing ladle argon blowing and RH vacuum treatment, entering a sheet billet for continuous casting, soaking in a tunnel furnace, and then entering a 7-stand continuous rolling unit for rolling; hot rolling the thin slab to obtain a hot rolled plate with the thickness of 2.5 mm; the hot rolled plate is pickled, cold rolled, annealed and coated to produce a low-grade electrical steel strip product with the thickness of 0.5 mm.
The specific process parameters are as follows:
KR desulfuration is carried out on molten iron, wherein the S content in the used molten iron is 0.040 percent, the Nb content is 0.002 percent, the V content is 0.06 percent, the Ti content is 0.10 percent, the temperature is 1360 ℃, the S content in the molten iron after KR desulfuration is 0.0010 percent, and the temperature is 1260 ℃;
converter steelmaking, wherein the tapping temperature is 1670 ℃, the converter end point C content is 0.03 percent, and the S content is 0.0020 percent;
RH vacuum refining, tapping temperature is 1590 ℃;
the thickness of a continuous casting blank is 70mm, the drawing speed is 3.5m/min, the first section water flow of a continuous casting fan-shaped section is controlled to be 3700L/min, the second section is controlled to be 1400L/min, the third section is controlled to be 1100L/min, and the fourth section is controlled to be 460L/min, so that the problem that the corrugated mark defect is easily generated in the production of silicon steel by using a thin slab is solved; the water flow parameters of the continuous casting sector section are shown in a table 4;
directly heating the plate blank in a heating furnace, wherein the temperature of the heating furnace is controlled at 1060 ℃, and the heating time is 1.2h;
hot rolling to form a hot coil, wherein the finishing temperature is 890 ℃, and the coiling temperature is 680 ℃;
removing oxide scales and the like on the surface of the hot coil by acid washing, and acid washing by hydrochloric acid at the temperature of 75 ℃;
annealing the coating in a continuous horizontal annealing furnace, wherein the heating rate is 130 ℃/s, the annealing soaking temperature is 870 ℃, the soaking and heat preservation time is 2.5min, the volume content of hydrogen in the furnace is 8 percent, the dew point is 30 ℃, and the annealed strip steel is subjected to insulation coating to obtain a finished product.
The medium-grade cold-rolled non-oriented electrical steel plate manufactured by the process has no defects such as corrugation mark and the like on the surface, good surface quality and iron loss P of finished products 1.5/50 4.22W/Kg, magnetic induction B 5000 1.769T, excellent magnetic performance.
Comparative example 1
The non-oriented electrical steel produced by the CSP process comprises the following components in percentage by mass: as shown in table 2, the balance not shown in table 1 is Fe and inevitable impurities.
The production method comprises the following steps: firstly, performing molten iron pretreatment, then smelting in a converter, performing ladle argon blowing and RH vacuum treatment, entering a sheet billet for continuous casting, soaking in a tunnel furnace, and then entering a 7-stand continuous rolling unit for rolling; hot rolling the thin slab to obtain a hot rolled plate with the thickness of 2.3 mm; the hot rolled plate is pickled, cold rolled, annealed and coated to produce a low-grade electrical steel strip product with the thickness of 0.5 mm.
KR desulfuration is carried out on molten iron, wherein the S content in the molten iron is 0.035%, the Nb content is 0.002%, the V content is 0.04%, the Ti content is 0.09%, the temperature is 1366 ℃, and the S content in the molten iron after KR desulfuration is 0.0010% and the temperature is 1260 ℃;
the steel is smelted by a converter, the tapping temperature is 1665 ℃, the content of C at the end point of the converter is 0.03 percent, and the content of S is 0.0020 percent;
RH vacuum refining, tapping temperature is 1580 ℃;
the thickness of a continuous casting blank is 70mm, the pulling speed is 3.5m/min, the first section water flow of the continuous casting fan-shaped section is controlled to be 3600L/min, the second section is controlled to be 1500L/min, the third section is controlled to be 1000L/min, and the fourth section is controlled to be 460L/min, so that the problem that the corrugated mark defect is easily generated in the production of silicon steel by using a thin slab is solved; the water flow parameters of the continuous casting sector section are shown in a table 4;
directly heating the plate blank in a heating furnace, wherein the temperature of the heating furnace is controlled at 1060 ℃, and the heating time is 1.2h;
hot rolling to form a hot coil, wherein the finishing temperature is 890 ℃, and the coiling temperature is 670 ℃;
removing oxidized iron scales and the like on the surface of the hot coil by acid cleaning, and acid cleaning by hydrochloric acid at the temperature of 85 ℃;
annealing the coating in a continuous horizontal annealing furnace, wherein the heating rate is 130 ℃/s, the annealing soaking temperature is 870 ℃, the soaking and heat preservation time is 2.5min, the volume content of hydrogen in the furnace is 8 percent, the dew point is 30 ℃, and the annealed strip steel is subjected to insulation coating to obtain a finished product.
The low-grade cold-rolled non-oriented electrical steel plate manufactured by the process has no defects such as stripes, corrugation marks and the like on the surface, good surface quality and iron loss P of finished products 1.5/50 4.45W/Kg, magnetic induction B 5000 The magnetic induction is 1.742T, and the magnetic induction is low, so that the target requirement is not met.
Comparative example 2
The non-oriented electrical steel produced by the CSP process comprises the following components in percentage by mass: as shown in table 2, the balance not shown in table 2 is Fe and inevitable impurities.
The production method comprises the following steps: firstly, performing molten iron pretreatment, then smelting in a converter, performing ladle argon blowing and RH vacuum treatment, entering a sheet billet for continuous casting, soaking in a tunnel furnace, and then entering a 7-stand continuous rolling unit for rolling; hot rolling the thin slab to obtain a hot rolled plate with the thickness of 2.5 mm; the hot rolled plate is pickled, cold rolled, annealed and coated to produce a low-grade electrical steel strip product with the thickness of 0.5 mm.
Performing KR desulfurization on molten iron, wherein the S content in the molten iron is 0.038%, the Nb content is 0.002%, the V content is 0.06%, the Ti content is 0.10%, the temperature is 1360 ℃, the S content in the molten iron after KR desulfurization is 0.0010%, and the temperature is 1260 ℃;
converter steelmaking, wherein the tapping temperature is 1670 ℃, the converter end point C content is 0.02 percent, and the S content is 0.0020 percent;
RH vacuum refining, tapping temperature is 1590 ℃;
the thickness of a continuous casting blank is 70mm, the drawing speed is 3.5m/min, the water flow of a first section of a continuous casting fan-shaped section is controlled to be 5500L/min, the water flow of a second section of the continuous casting fan-shaped section is controlled to be 2000L/min, the water flow of a third section of the continuous casting fan-shaped section is controlled to be 1000L/min, and the water flow of a fourth section of the continuous casting fan-shaped section is controlled to be 460L/min; the water flow parameters of the continuous casting sector section are shown in a table 4;
directly heating the plate blank in a heating furnace, wherein the temperature of the heating furnace is controlled at 1060 ℃, and the heating time is 1.2h;
hot continuous rolling is carried out to form a hot coil, the finishing temperature is 890 ℃, and the coiling temperature is 670 ℃;
removing oxidized iron scales and the like on the surface of the hot coil by acid cleaning, and acid cleaning by hydrochloric acid at the temperature of 85 ℃;
and annealing the annealing coating in a continuous horizontal annealing furnace, wherein the heating rate is 130 ℃/s, the annealing soaking temperature is 870 ℃, the soaking and heat preservation time is 2.5min, the volume content of hydrogen in the furnace is 8 percent, the dew point is 30 ℃, and the annealed strip steel is subjected to insulation coating to obtain a finished product.
The low-grade cold-rolled non-oriented electrical steel plate prepared by the process has no defects such as stripes, corrugation marks and the like on the surface, good surface quality and iron loss P of a finished product 1.5/50 4.29W/Kg, magnetic induction B 5000 The magnetic property is 1.760T, but the corrugated defect exists on the surface.
TABLE 1 ingredient contents and temperatures of examples and comparative examples
TABLE 2 composition contents of thin slabs in examples and comparative examples
| Serial number | Test of | C(％) | Si(％) | Mn(％) | P(％) | S(％) | Als(％) | Sn(％) | N(％) | Nb(％) | V(％) | Ti(％) |
| 1 | Example 1 | 0.0020 | 1.21 | 0.25 | 0.020 | 0.0016 | 0.0012 | 0.10 | 0.0020 | 0.0020 | 0.0020 | 0.0025 |
| 2 | Example 2 | 0.0018 | 1.15 | 0.25 | 0.023 | 0.0016 | 0.0030 | 0.08 | 0.0016 | 0.0020 | 0.0018 | 0.0020 |
| 3 | Example 3 | 0.0018 | 1.32 | 0.30 | 0.018 | 0.0016 | 0.0020 | 0.12 | 0.0020 | 0.0020 | 0.0020 | 0.0020 |
| 4 | Comparative example 1 | 0.0015 | 1.45 | 0.43 | 0.030 | 0.003 | 0.3500 | - | 0.0020 | 0.0018 | 0.0020 | 0.0018 |
| 5 | Comparative example 2 | 0.0016 | 1.33 | 0.34 | 0.020 | 0.002 | 0.0015 | 0.12 | 0.0030 | 0.0020 | 0.0020 | 0.0020 |
Table 3 main process parameters and performance lists for each example and comparative example
TABLE 4 tabulation of corresponding main process parameters and surface qualities for examples and comparative examples
Description of the drawings: the embodiments 1-3 are controlled according to the steps and processes of the invention, the product has low performance, iron loss, high magnetic induction and high production efficiency. Comparative example 1, sn element is not added, and the product performance does not reach the level of the invention; comparative example 2, the water flow of the continuous casting sector section is higher, the casting blank is strongly cooled to generate compact columnar crystals, and the surface of the final product has corrugated defects. See fig. 9-10. FIG. 9 shows the macrostructure of a casting blank in example 1 of the present invention, in which columnar crystals of the casting blank are not dense, equiaxed crystals exist in the middle, and a finished product has no corrugation; FIG. 10 shows a low-quality structure of a cast slab in comparative example 2, in which dense columnar crystals are present in the cast slab and corrugations are present in the finished product.
It is clear that the specific implementation of the invention is not restricted to the above-described modes, and that various insubstantial modifications of the inventive concept and solution are within the scope of protection of the invention.
Claims (3)
1. The high-efficiency cold-rolled non-oriented electrical steel produced by the CSP process is characterized by comprising the following components in percentage by mass:
less than or equal to 0.0030 percent of C, 1.00 to 1.70 percent of Si, less than or equal to 0.0050 percent of Als, 0.10 to 0.30 percent of Mn, 0.01 to 0.3 percent of Sns, less than or equal to 0.050 percent of P, less than or equal to 0.0080 percent of S, less than or equal to 0.0030 percent of N, less than or equal to 0.0030 percent of Nb, less than or equal to 0.0030 percent of V, less than or equal to 0.0030 percent of Ti, and the balance of Fe and inevitable impurities;
the CSP process is used for producing the high-efficiency cold-rolled non-oriented electrical steel with a ferrite structure and a grain size of 55-60 mu m; iron loss P 1.5/50 Less than or equal to 4.40W/kg, and magnetic induction B 5000 The temperature is more than or equal to 1.76T, and no corrugated defect exists;
the production method for producing the high-efficiency cold-rolled non-oriented electrical steel by the CSP process comprises the following steps:
1) Desulfurizing the molten iron KR;
2) Converter steelmaking;
3) RH vacuum refining
4) Continuous casting;
5) Heating a casting blank;
6) Hot continuous rolling;
7) Acid washing;
8) Annealing;
the continuous casting specific process in the step 4) comprises the following steps: the thickness of the continuous casting blank is 60-90mm, and the pulling speed is 3-4.5m/min; controlling the water flow of a first section of the continuous casting fan-shaped section at 3000-4000L/min, controlling the water flow of a second section at 1200-2200L/min, controlling the water flow of a third section at 800-1400L/min and controlling the water flow of a fourth section at 450-500L/min;
and 8) annealing, wherein the heating rate is more than 120 ℃/s, the annealing soaking temperature is 800-950 ℃, the soaking and heat preservation time is 1-4min, the hydrogen content in the furnace is more than or equal to 5%, and the dew point is less than or equal to 30 ℃.
2. The CSP process for producing the high-efficiency cold-rolled non-oriented electrical steel according to claim 1, wherein the slab heating in the step 5) is that the slab directly enters a heating furnace for heating, the temperature of the heating furnace is controlled to be 1050-1300 ℃, and the heating time is 0.4-1.5h.
3. The CSP process of claim 1, for producing high-efficiency cold-rolled non-oriented electrical steel,
and 6), performing hot continuous rolling, wherein the finishing temperature is 830-920 ℃, and the coiling temperature is 580-720 ℃.
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