CN114318127B - Production method of ultra-low anisotropy non-oriented silicon steel for super-large generator - Google Patents
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Abstract
A production method of ultra-low anisotropy non-oriented silicon steel for an extra-large generator comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter steelmaking, RH refining, continuous casting of molten steel into plate blanks, hot rolling, normalized pickling, cold rolling, annealing, coating and finishing; wherein the non-oriented electrical steel comprises the following components in percentage by weight: less than or equal to 0.003 percent of C, 2.80 to 3.60 percent of Si, 0.15 to 0.45 percent of Mn, less than or equal to 0.04 percent of P, 0.4 to 1.2 percent of Als, less than or equal to 0.002 percent of S, and the balance of Fe and other inevitable impurities; the annealing adopts a continuous annealing furnace, the annealing temperature of a heating section and a soaking section is controlled at 860-1030 ℃, the speed of the strip steel is 90-130 m/min, and the unit tension of the strip steel at the inlet and the outlet of the annealing furnace is less than 2.5N/mm 2 The unit tension of the strip steel of the soaking section in the annealing furnace is less than 1N/mm 2 . The non-oriented silicon steel has the iron loss P15/50 of less than or equal to 2.5W/kg, the magnetic induction B50 of more than or equal to 1.65T, the magnetic induction B100 of more than or equal to 1.76T, the anisotropy of the iron loss P15/50 of less than or equal to 8 percent and the P10/50C of less than or equal to 1.12W/kg.
Description
Technical Field
The invention relates to a production technology of non-oriented silicon steel, in particular to a production method of ultra-low anisotropy non-oriented silicon steel for an extra-large generator.
Background
The top-grade high-grade non-oriented silicon steel is an important iron core soft magnetic material for manufacturing variable frequency motors, driving motors and particularly large generators. The magnetic flux density of the silicon steel sheets shows intensity difference in different directions under the influence of factors such as matrix atom arrangement, track coupling and the like in the magnetization process, and the large-scale laminated stator-rotor motor requires that the silicon steel sheets have lower iron loss and small performance difference of longitudinal and transverse iron loss, namely small anisotropy, in order to prevent the imbalance of motor rotation caused by nonuniform iron core magnetic field density. As the non-oriented silicon steel inevitably has a rolling texture in the production process, the {100} {110} plane texture with easy magnetization capability is difficult to uniformly distribute, and the anisotropy of iron loss and magnetic induction intensity always exists.
In the production process of high-grade electrical steel products, with the increase of Si content, columnar crystals are large and the proportion is increased, intergranular segregation residual elements, harmful elements and compounds thereof form large strip-shaped structures in the subsequent hot rolling and cold rolling processes, the electromagnetic performance of finished products in the rolling direction is superior to that in the transverse direction, and the magnetic anisotropy is increased when the grade is higher.
In the prior art, for example, the Chinese patent No. CN201410386178.4 discloses a low magnetic anisotropy non-oriented silicon steel plate and a preparation process thereof, the method mainly adopts the steps of controlling the content of main alloy and adding appropriate trace elements Mo, cr and Ce at the same time, so that the magnetic anisotropy constant of the non-oriented silicon steel during magnetization is reduced, and the magnetic anisotropy is reduced; this technique achieves the purpose of reducing the magnetic anisotropy by adding other elements, which increases the production cost.
Chinese patent No. CN201610562185.4 discloses a production method for improving the electromagnetic property anisotropy of an electrical steel product, which mainly realizes the purpose of improving the magnetic anisotropy by controlling the elongation and the heating speed of strip steel during annealing; but is mainly effective for medium and high grade non-oriented silicon steel, and has no obvious effect on the non-oriented silicon steel with silicon content more than 2.90 percent.
Chinese patent No. CN201810081918.1 discloses a method for preparing thin-strip continuous casting low-magnetic-anisotropy non-oriented silicon steel, which mainly adopts a thin-strip continuous casting technology, controls the processes of hot rolling reduction rate and the like, and simultaneously adds Sn and other elements to achieve the aim of producing the low-magnetic-anisotropy non-oriented silicon steel; the method is suitable for non-oriented silicon steel with silicon content less than 2.0 percent, adopts a thin strip continuous casting technology, and has advanced process technology but is not suitable for the large-scale production process of conventional equipment.
For non-oriented silicon steel, the thicker the thickness, the poorer the magnetic performance and anisotropy, and the higher the iron loss, the thickness of the non-oriented silicon steel which is commonly used in large-scale hydroelectric power generation equipment is 0.5mm through inquiry and comparison, and for the preparation of the non-oriented silicon steel with the thickness, no effective method in the prior art is available for better controlling the iron loss anisotropy under the condition of keeping excellent magnetic performance and lower iron loss.
The national standard GB/T2521.1-2016 No. 1 part of the full-process cold-rolled electrical steel: the characterization method of the magnetic anisotropy specified in the grain non-oriented steel strip (sheet) is that the anisotropy of high-grade non-oriented silicon steel is required to be less than or equal to 17 percent. The anisotropy of the high-grade non-oriented silicon steel widely used in the current market is 12-13%, the P10/50C performance (namely the transverse iron loss of a silicon steel sheet under the magnetic field strength of 1 Tesla magnetic 50 Hz) is more than 1.15W/kg, and the performance requirement of the high-grade non-oriented electrical steel for large-scale hydroelectric nuclear power such as three gorges cannot be met.
Disclosure of Invention
The invention aims to provide a production method of non-oriented silicon steel for ultra-low anisotropy of an extra-large generator, and the obtained non-oriented silicon steel has excellent ultra-low anisotropy, particularly excellent P10/50C performance; the iron loss P15/50 is less than or equal to 2.50W/kg, the magnetic induction B50 is more than or equal to 1.65T, the magnetic induction B100 is more than or equal to 1.76T, the anisotropy of the iron loss P15/50 is less than or equal to 8 percent, and the anisotropy of the iron loss P10/50C is less than or equal to 1.12W/kg.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a production method of ultra-low anisotropy non-oriented silicon steel for an extra-large generator comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter steelmaking, RH refining, continuous casting of molten steel into plate blanks, hot rolling, normalized pickling, cold rolling, annealing, coating and finishing; wherein the content of the first and second substances,
the non-oriented electrical steel comprises the following chemical components in percentage by weight: less than or equal to 0.003 percent of C, 2.80 to 3.60 percent of Si, 0.15 to 0.45 percent of Mn, less than or equal to 0.04 percent of P, 0.4 to 1.2 percent of Als, less than or equal to 0.002 percent of S, and the balance of Fe and other inevitable impurities;
the annealing adopts a continuous annealing furnace, which comprises a heating section, a soaking section and a cooling section; the annealing temperature of the heating section and the soaking section is controlled to be 860-1030 ℃, the speed of the strip steel is 90-130 m/min, and the unit tension of the strip steel at the inlet and the outlet of the annealing furnace is less than 3N/mm 2 The unit tension of the strip steel at the soaking section in the annealing furnace is less than 1.5N/mm 2 (ii) a Atmosphere in the annealing furnace is N 2 And H 2 Mixed gas of H 2 The concentration is controlled to be 20-50% by volume, and the dew point in the furnace is controlled to be below-20 ℃;
the iron loss P15/50 of the obtained non-oriented silicon steel is less than or equal to 2.5W/kg, the magnetic induction B50 is more than or equal to 1.65T, the magnetic induction B100 is more than or equal to 1.76T, the anisotropy of the iron loss P15/50 is less than or equal to 8 percent, and the P10/50C is less than or equal to 1.12W/kg.
Preferably, the unit tension of the strip steel at the inlet and the outlet of the annealing furnace is less than 2N/mm 2 。
Preferably, the unit tension of the strip steel in the annealing furnace is less than 1N/mm 2 。
Preferably, N is less than or equal to 0.003wt% and Ti is less than or equal to 0.003wt% in the impurities.
Preferably, the coating comprises the following components in percentage by mass: 10 to 30 percent of titanium dioxide, 10 to 30 percent of barium sulfate, 1 to 5 percent of silica sol, 0.5 to 5 percent of titanate coupling agent, 2 to 6 percent of organic solvent, 0.1 to 0.5 percent of other auxiliary agents and the balance of water.
Preferably, the coating process is to adopt a two-roller or three-roller coating machine to coat a paint film on two surfaces of the strip steel, the thickness of the paint film is adjusted by adjusting the peripheral speed ratio of the coating roller, the liquid taking roller and the strip steel and the pressure of the coating roller and the liquid taking roller, the peripheral speed ratio of the coating roller is controlled to be 0.4-0.9, the peripheral speed ratio of the liquid taking roller is 0.15-0.6, the pressure of the coating roller and the liquid taking roller is 0.35-0.7MPa, and the paint film coated on the surface of the strip steel is dried and solidified into a film at the baking temperature of 250-350 ℃.
Preferably, the coating is coiled into a steel coil, and the coiling tension is 15-25N/mm 2 Coefficient of coiling tension taperThe requirements are 1.1 to 1.5.
The main control point of the performance of the non-oriented silicon steel product is in the continuous annealing production process, and the continuous recrystallization annealing is one of important process means for improving the electromagnetic performance and the magnetic anisotropy of the non-oriented silicon steel.
The annealing of the invention adopts a continuous annealing furnace, and in order to realize the control of small tension in the furnace, the actual tension of each section in the furnace must be known firstly. The tension difference from the inlet and the outlet of the furnace shows that the tension of the strip steel is changed after the strip steel is transmitted by the furnace roller in the furnace. The continuous annealing furnace is a horizontal furnace, the tension of the strip steel in the furnace has great influence on the electromagnetic performance of the strip steel, and the tension in the furnace influences the stress release and the grain growth orientation of materials in the high-temperature annealing process, so that the transverse magnetism of the strip steel is deteriorated, and the anisotropy is increased. Of course, too small tension in the furnace can also affect the improvement of the strip steel plate shape and cause the strip steel in the furnace to deviate, thereby causing the conditions of edge scraping and strip breaking and the like to affect the plate passing. Tension measurements of the horizontal furnace were obtained by means of the measurements Zhang Yi installed at the entrance and exit of the furnace, whereas the actual tension inside the furnace was not known because of the absence of measurement means. The tension of the furnace section is generally represented by the tension of the inlet and the outlet of the furnace. However, because the length of the furnace of the common horizontal furnace is very long, one furnace roller is distributed at intervals, and the number of the furnace rollers in the whole furnace section is hundreds. The linear velocity of hundreds of furnace rollers is difficult to keep synchronous with the strip steel, and the main reasons are two:
1. caused by the change of the roller diameter of the furnace roller; the diameter of the furnace roller is reduced along with the extension of the production time (the furnace roller is made of carbon in general and is easy to wear in order to bear high temperature);
2. because the strip steel temperature in different areas of the furnace is different, the strip steel speed is greatly different in different areas due to great influence of heat expansion and cold contraction. Because the speed of the furnace roller and the speed of the strip steel can not be synchronous, acting force is generated between the furnace roller and the strip steel, and the difference between the tension of the strip steel in the furnace and the tension of the inlet and the outlet of the furnace is large. The variation in the furnace tension causes the product to have a large variation in its properties.
The main factors influencing the magnetic performance of the non-oriented silicon steel are chemical composition, crystal texture and grain size. Recrystallization annealing is a necessary link in the production of non-oriented electrical steel and is an important process for determining the magnetic property. Recrystallization annealing promotes the cold-rolled strip steel to eliminate strain caused by cold rolling and promote grain growth through recrystallization, the recrystallization annealing process comprises a temperature system, annealing time, furnace tension and furnace atmosphere, and the recrystallization annealing tension control is an important means for ensuring good magnetic anisotropy.
Any object has the phenomenon of thermal expansion and cold contraction, the linear expansion coefficient of the steel is increased along with the increase of the temperature, when the temperature reaches 1000 ℃, the elongation of the strip steel is more than 1.5 percent, namely, in the soaking section of the annealing furnace, the speed of the strip steel is faster than the speed of the furnace inlet by more than 1.5 percent, and because the set speed of the furnace roller is set according to the speed of the furnace inlet, the linear speed of the strip steel is 1.5 percent slower than that of the strip steel, the situation that the furnace roller rotates when the strip steel is pulled by the strip steel can occur. The furnace rollers have reverse acting force on the strip steel, and the annealing furnace has hundreds of rollers under the continuous accumulation action, so that the tension in the furnace is continuously increased, and the actual tension in the annealing furnace is far greater than the tension at the inlet and the outlet of the annealing furnace. Therefore, the actual load of the furnace roller has great influence on the tension of the strip steel in the furnace, especially the root cause that the tension in the annealing furnace rises sharply and the anisotropy index exceeds the standard due to the overlarge tension in the furnace. The tension of the strip steel under the high-temperature condition has great influence on the anisotropy of the strip steel, and the anisotropy value is increased along with the increase of the tension. Therefore, minimizing the tension in the soaking zone is an effective measure to reduce the anisotropy value.
The main reason for the large anisotropy of the strip steel is that the tension of the soaking section of the furnace is too large, and the reason for the large tension is that the speeds of the furnace roller and the strip steel are not synchronous due to the overhigh furnace temperature, so that the tension of the soaking section of the furnace cannot be ensured by simply adjusting the tension of the inlet and the outlet of the furnace. Therefore, the rotating speed of the furnace roller is controlled according to the area of the furnace roller, so that the linear speed of the furnace roller is close to the actual speed of the strip steel, and the tension of the strip steel in a soaking section is as small as possible.
The tension control in the annealing furnace is closely related to the temperature distribution in the furnace, the actual tension of the strip steel is reduced by the tension control along with the rise of the temperature of the strip steel, the tension of the strip steel is minimum when the strip steel runs to a soaking section, and the tension of the strip steel is increased when the strip steel runs to a cooling section. The invention is more beneficial to the transverse growth of crystal grains during recrystallization annealing through the control of small tension of the soaking section, so that the longitudinal and transverse sizes of the crystal grains are more uniform, thereby improving the anisotropy.
In the coating process of the coating, the coating comprises the following components in percentage by mass: 10 to 30 percent of titanium dioxide, 10 to 30 percent of barium sulfate, 1 to 5 percent of silica sol, 0.5 to 5 percent of titanate coupling agent, 2 to 6 percent of organic solvent, 0.1 to 0.5 percent of other auxiliary agents and the balance of water. When in use, the stock solution and a certain amount of water are mixed to form a liquid with viscosity (40-60S coating 4 cups).
The coating process adopts a two-roller or three-roller coating machine, a paint film is coated on two surfaces of the strip steel, the thickness of the paint film is adjusted by adjusting the peripheral speed ratio of a coating roller, a liquid taking roller and the strip steel and the pressure of the coating roller and the liquid taking roller, the peripheral speed ratio of the coating roller is controlled to be (0.4-0.9), the peripheral speed ratio of the liquid taking roller is (0.15-0.6), the pressure of the coating roller and the liquid taking roller is (0.35-0.7 MPa), and the paint film coated on the surface of the strip steel is dried and cured to form a film at the baking temperature of 250-350 ℃. The coating is an environment-friendly coating without chromate, the high-temperature processing resistance can reach 850 ℃, and the pencil hardness of a paint film can reach more than 8H.
The invention has the beneficial effects that:
under the original tension control mode, even if the tension of strip steel at the inlet and the outlet of the annealing furnace is 2N/mm 2 The unit tension of the strip steel in the annealing furnace is generally more than 3N/mm 2 Because of the expansion and contraction of the strip steel, the strip steel extends in the soaking section, the speed of the strip steel is higher than that of the furnace roller, namely the furnace roller has reverse acting force on the strip steel, and under the continuous accumulation action, the tension in the furnace is continuously increased, and the actual tension in the annealing furnace is far higher than the tension at the inlet and the outlet of the annealing furnace, so that the improvement of various anisotropy is not facilitated.
The invention eliminates the influence of the reverse acting force of the strip steel on the strip steel by a furnace roller of the soaking section through a small tension control technology and the control of the inlet and the outlet of the annealing furnace and the unit tension of the strip steel of the soaking section in the annealing furnace, ensures the small tension control of the strip steel in a high-temperature area during the annealing process, better releases the rolling stress during the recrystallization annealing process of the strip steel, fully grows grains, improves the transverse performance of the material and reduces various anisotropy.
Detailed Description
The present invention will be further described with reference to the following examples.
The invention relates to a production method of ultra-low anisotropy non-oriented silicon steel for an extra-large generator, which comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter steelmaking, RH refining, continuous casting of molten steel into plate blanks, hot rolling, normalized pickling, cold rolling, annealing, coating and finishing; wherein the content of the first and second substances,
the non-oriented electrical steel comprises the following chemical components in percentage by weight: less than or equal to 0.003 percent of C, 2.80 to 3.60 percent of Si, 0.15 to 0.45 percent of Mn, less than or equal to 0.04 percent of P, 0.4 to 1.2 percent of Als, less than or equal to 0.002 percent of S, and the balance of Fe and other inevitable impurities;
the annealing adopts a continuous annealing furnace, which comprises a heating section, a soaking section and a cooling section; the annealing temperature of the heating section and the soaking section is controlled at 860-1030 ℃, the speed of the strip steel is 90-130 m/min, the unit tension of the strip steel at the inlet and the outlet of the annealing furnace is less than 3N/mm 2 The unit tension of the strip steel at the soaking section in the annealing furnace is less than 1.5N/mm 2 (ii) a The atmosphere in the annealing furnace is N 2 And H 2 Mixed gas of which H 2 The concentration is controlled to be 20-50% by volume, and the dew point in the furnace is controlled to be below-20 ℃;
the iron loss P15/50 of the obtained non-oriented silicon steel is less than or equal to 2.5W/kg, the magnetic induction B50 is more than or equal to 1.65T, the magnetic induction B100 is more than or equal to 1.76T, the anisotropy of the iron loss P15/50 is less than or equal to 8 percent, and the anisotropy of the P10/50C is less than or equal to 1.12W/kg.
Preferably, the unit tension of the strip steel at the inlet and the outlet of the annealing furnace is less than 2N/mm 2 。
Preferably, the unit tension of the strip steel in the annealing furnace is less than 1.5N/mm 2 。
Preferably, N is less than or equal to 0.003wt% and Ti is less than or equal to 0.003wt% in the impurities.
The coating comprises the following components in percentage by mass: 10 to 30 percent of titanium dioxide, 10 to 30 percent of barium sulfate, 1 to 5 percent of silica sol, 0.5 to 5 percent of titanate coupling agent, 2 to 6 percent of organic solvent, 0.1 to 0.5 percent of other auxiliary agents and the balance of water.
The coating process adopts a two-roller or three-roller coating machine to coat a paint film on two surfaces of the strip steel, the thickness of the paint film is adjusted by adjusting the peripheral speed ratio of a coating roller, a liquid taking roller and the strip steel and the pressure of the coating roller and the liquid taking roller, the peripheral speed ratio of the coating roller is controlled to be 0.4-0.9, the peripheral speed ratio of the liquid taking roller is 0.15-0.6, the pressure of the coating roller and the liquid taking roller is 0.35-0.7MPa, and the paint film coated on the surface of the strip steel is dried and cured to form a film at the baking temperature of 250-350 ℃.
The strip steel is coiled into a steel coil after being coated, and the coiling tension is 15 to 25N/mm 2 The coiling tension taper coefficient is required to be 1.1-1.5.
The composition examples of the electrical steel of the super-large generator are shown in table 1, the production process parameters are shown in table 2, and the performance parameters of the electrical steel of the super-large generator are shown in table 3.
Table 1 units: weight percent of
| C | Si | Mn | P | S | Als | N | Ti | |
| Example 1 | 0.0013 | 3.51 | 0.18 | 0.015 | 0.0015 | 0.45 | 0.0006 | 0.0001 |
| Example 2 | 0.0020 | 3.35 | 0.25 | 0.018 | 0.0010 | 0.64 | 0.0008 | 0.0002 |
| Example 3 | 0.0018 | 3.14 | 0.31 | 0.020 | 0.0008 | 0.58 | 0.0012 | 0.0004 |
| Example 4 | 0.0023 | 3.05 | 0.23 | 0.027 | 0.0007 | 0.73 | 0.0009 | 0.0008 |
| Example 5 | 0.0015 | 2.94 | 0.43 | 0.033 | 0.0006 | 0.81 | 0.0008 | 0.0011 |
| Example 6 | 0.0025 | 2.83 | 0.41 | 0.038 | 0.0005 | 1.10 | 0.0015 | 0.0005 |
TABLE 2
TABLE 3
With the increasing demand of users, the demand of high-grade products without orientation is increasing, and an important index for producing the high-grade products is magnetic anisotropy, especially the extremely high requirement on P10/50C performance. The main factors influencing the magnetic performance include factors such as component production process and the like, and the key factor influencing the magnetic anisotropy is the tension in an annealing furnace. The production of good anisotropic property and P10/50C property requires micro-tension control in an annealing furnace. At present, all steel mills can not produce micro-tension in the furnace, so the anisotropy index and the P10/50C performance of the steel grade can hardly meet the requirements.
The super-huge generator electric steel sheet produced by the method meets the requirements of domestic large generators, solves the production restriction of non-oriented high-grade products, passes the quality certification of a plurality of domestic and foreign electric machine plants, can be applied to 100-ten-thousand kilowatt-level nuclear power and hydroelectric large generators, breaks the foreign monopoly when applied to the large hydropower projects such as national key project three gorges power stations, two-beach power stations and the like, fills the domestic blank, and has important strategic significance on the electric power safety of China.
Claims (7)
1. A production method of ultra-low anisotropy non-oriented silicon steel for an extra-large generator comprises the following steps: the method comprises the following steps of molten iron pretreatment, converter steelmaking, RH refining, continuous casting of molten steel into plate blanks, hot rolling, normalized pickling, cold rolling, annealing, coating and finishing; it is characterized in that, among them,
the non-oriented silicon steel comprises the following chemical components in percentage by weight: less than or equal to 0.003 percent of C, 2.80 to 3.60 percent of Si, 0.15 to 0.45 percent of Mn, less than or equal to 0.04 percent of P, 0.4 to 1.2 percent of Als, less than or equal to 0.002 percent of S, and the balance of Fe and other inevitable impurities;
the annealing adopts a continuous annealing furnace, which comprises a heating section, a soaking section and a cooling section; the annealing temperature of the heating section and the soaking section is controlled at 860-1030 ℃, the speed of the strip steel is 90-130 m/min, the unit tension of the strip steel at the inlet and the outlet of the annealing furnace is less than 3N/mm 2 The unit tension of the strip steel at the soaking section in the annealing furnace is less than 1.5N/mm 2 (ii) a The atmosphere in the annealing furnace is N 2 And H 2 Mixed gas of which H 2 The concentration is controlled to be 20 to 50 percentThe volume ratio and the dew point in the furnace are controlled below-20 ℃;
the iron loss P15/50 of the obtained non-oriented silicon steel is less than or equal to 2.5W/kg, the magnetic induction B50 is more than or equal to 1.65T, the magnetic induction B100 is more than or equal to 1.76T, the anisotropy of the iron loss P15/50 is less than or equal to 8 percent, and the P10/50C is less than or equal to 1.12W/kg.
2. The method of manufacturing non-oriented silicon steel as set forth in claim 1, wherein the strip at the inlet and outlet of the annealing furnace has a unit tension of less than 2N/mm 2 。
3. The method of manufacturing non-oriented silicon steel as set forth in claim 1 or 2, wherein the unit tension of the strip steel in the annealing furnace is less than 1.5N/mm 2 。
4. The method of claim 1, wherein the impurities include N less than or equal to 0.003wt% and Ti less than or equal to 0.003wt%.
5. The method for producing non-oriented silicon steel as claimed in claim 1, wherein the coating comprises the following coating components in percentage by mass: 10 to 30 percent of titanium dioxide, 10 to 30 percent of barium sulfate, 1 to 5 percent of silica sol, 0.5 to 5 percent of titanate coupling agent, 2 to 6 percent of organic solvent, 0.1 to 0.5 percent of other auxiliary agents and the balance of water.
6. The method for producing non-oriented silicon steel as claimed in claim 1, wherein the coating process uses a two-roll or three-roll coating machine to coat a paint film on both surfaces of the strip steel, the thickness of the paint film is adjusted by adjusting the peripheral speed ratio of the coating roll, the liquid-taking roll and the strip steel and the pressure of the coating roll and the liquid-taking roll, the peripheral speed ratio of the coating roll is controlled to be 0.4-0.9, the peripheral speed ratio of the liquid-taking roll is 0.15-0.6, the pressure of the coating roll and the liquid-taking roll is 0.35-0.7MPa, and the paint film coated on the surface of the strip steel is dried and cured to form a film at a baking temperature of 250-350 ℃.
7. The method of producing non-oriented silicon steel as set forth in claim 1, wherein the strip steel is coated and wound into a coil having a winding tension of 15 to 25N/mm 2 The coiling tension taper coefficient is required to be 1.1-1.5.
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