CN110791635A - Method for preparing high-magnetic-induction oriented silicon steel - Google Patents
Method for preparing high-magnetic-induction oriented silicon steel Download PDFInfo
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Abstract
The invention relates to a method for preparing high magnetic induction oriented silicon steel, which comprises the steps of adding Sb element into silicon steel components, simultaneously adding a small amount of Cu, wherein the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200-250 mm; the heating temperature of the casting blank is 1180-1220 ℃, and the heating time is 180-240 min; the normalizing process adopts two-stage normalizing; the nitriding treatment process is 75 percent of H2+25％N2In the presence of NH3Nitriding; the high-temperature annealing is carried out at the speed of 50-100 ℃/h in N2Raising the temperature to 600-650 ℃ in the atmosphere and then adding 75% of H2+25％N2The temperature of the protective atmosphere (volume fraction) is kept for 5-10 h at the temperature, and then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/h; after coating the insulating layer, drying the coating at a temperature below 500 ℃ and carrying out stretching and flattening annealing with 0.25 to 0.75 percent of elongation at a temperature of about 800 to 900 ℃. The qualified rate of magnetic performance is more than 80%. The magnetic induction value of the oriented silicon steel is improved. The qualified rate of the oriented silicon steel performance is improved by 15-25%.
Description
Technical Field
The invention relates to the field of steel metallurgy, in particular to a method for preparing high-magnetic-induction oriented silicon steel.
Background
The oriented silicon steel containing 3 percent of silicon is an indispensable important metal functional material in the industries of electricity, electronics and military, and is a high value-added product which can be produced in large batch by the steel enterprises at present. The oriented silicon steel has the advantages of complex production process, narrow parameter window, long working procedure, high technical content and many influencing factors, and is known as an artwork in steel products. The production process flow of the oriented silicon steel is as follows:
molten iron pretreatment → smelting → external refining → continuous casting → heating and hot rolling of casting blank → normalized pickling → cold rolling → decarburization annealing and nitriding treatment and coating of MgO → high temperature annealing → hot drawing and leveling annealing and coating of insulating layer → shearing and packaging for warehousing
Sb is added into the oriented silicon steel components to enhance the inhibiting effect, the characteristic of nonuniform AlN precipitation in the extension direction is overcome, premature N removal and N increase due to high-temperature annealing temperature rise are prevented, the secondary recrystallization is more complete, the size of secondary grains is reduced, and the magnetism is improved.
The aim of heating the casting blank is to completely dissolve the inhibitor, obtain the required inhibitor in the subsequent process, ensure the complete development of secondary recrystallization and obtain high magnetism, and the AlN is completely dissolved when the casting blank is heated at 1180-1220 ℃, but is unevenly distributed because of being in a α + gamma two-phase region, because the solid solubility of the AlN in the gamma phase is higher than that in α phase, the AlN precipitated in a α phase is more coarsened and is often compositely precipitated with MnS.
Nitriding treatment and decarburization annealing are carried out on the same continuous furnace production line, the nitrogen content in the plate thickness direction is in gradient distribution after nitriding, the formed nitride is related to the nitriding temperature, when nitriding is carried out at high temperature (900-1050 ℃), a part of nitrogen atoms are combined with aluminum in steel to obtain more inhibitors, and at the moment, the quantity of new aluminum nitride required to be formed during secondary recrystallization annealing is small. The nitrogen introduced by the low temperature nitriding (650-800 ℃) process exists on the surface part of the steel strip mainly in the form of silicon nitride and manganese nitride, and the precipitates are unstable, so that the precipitates are required to be treated for a long time in the temperature range of 700-900 ℃ of high temperature annealing, so that the precipitates can be decomposed and release nitrogen, and the nitrogen reacts with aluminum to form aluminum nitride through diffusion, and at the moment, the amount of new aluminum nitride required to be formed in the secondary recrystallization annealing is large.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for preparing high-magnetic-induction oriented silicon steel, and the qualified rate of magnetic performance of the high-magnetic-induction oriented silicon steel stably produced is improved by 15-25%.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing high magnetic induction oriented silicon steel comprises the following smelting processes: smelting, continuous casting, heating and hot rolling of a casting blank, normalizing pickling, cold rolling, decarburization annealing and nitriding treatment, MgO coating, high-temperature annealing, hot stretching, leveling annealing, insulating layer coating, shearing, packaging and warehousing; wherein:
(1) smelting process
Smelting, and refining by using a converter and RH to obtain molten steel, wherein the molten steel comprises, by mass, 0.05-0.06% of C; si3.1-3.3%; 0.16-0.20% of Mn; 0.020-0.040% of P; 0.004-0.006% of S; 0.024-0.028% of Als; 0.004-0.006% of N; 0.06-0.08% of Sn; 0.04-0.08% of Cu; 0.10-0.14% of Cr; 0.03-0.05% of Sb0.03; the impurity content is required to be less than 0.0050 percent;
(2) continuous casting process
Pouring molten steel when the superheat degree is less than 50 ℃, wherein the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200-250 mm;
(3) hot rolling process
The heating temperature of the casting blank is 1180-1220 ℃, the heating time is 180-240 min, the rough rolling adopts a mode of 1 pass of a first rack and 3 passes of a second rack, 4 passes of rolling are carried out in total, and the thickness of the intermediate blank is 40-60 mm;
(4) normalizing process
The normalizing process adopts two-stage normalizing, wherein the first stage is at 1060-1100 ℃ for 2-4 min, the second stage is at 850-900 ℃, the starting cooling temperature is 750-800 ℃, the water spraying temperature is 40-50 ℃, and the water flow is 250-350 m3/h；
(5) Cold rolling process
The cold rolling adopts a sendzimir twenty-high roll mill, the total reduction rate is 84-88%, the 5-pass rolling is adopted, and the aging rolling is adopted in the 3 rd pass;
(6) decarburization annealing and nitriding treatment and MgO coating process
The decarburization annealing process is to perform decarburization at 800-850 ℃ for 3-5 min in an atmosphere containing 10% -20% of H2And 90% -80% N2The humidifying temperature of protective gas (volume fraction) is 50-70 ℃; the nitriding treatment process is 75 percent of H2+25％N2In the presence of NH3Nitriding (P)H2O/PH2Not more than 0.04, d.p. + 10-10 ℃) for 800-860 ℃ x 30 s; after coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
(7) high temperature annealing process
The high-temperature annealing is carried out at the speed of 50-100 ℃/h in N2Raising the temperature to 600-650 ℃ in the atmosphere and then adding 75% of H2+25％N2The (volume fraction) protective atmosphere is kept at the temperature for 5-10 h, then the temperature is raised to 1200 ℃ at the speed of 15-20 ℃/h, and the atmosphere contains 75% of N in the temperature raising process2+5％H2(volume fraction) of shielding gas, pure H at 1200 deg.C2Protecting, keeping the temperature for 20-40 h, then cooling to below 800 ℃ at a speed of 50 ℃/h, and discharging from the furnace when the temperature is lower than 300 ℃;
(8) hot stretching flattening annealing and insulating layer coating process
After the insulating layer is coated, the coating is dried below 500 ℃ and is subjected to stretching flattening annealing with 0.25 to 0.75 percent of elongation at 800 to 900 ℃.
The functions of the components in the molten steel are as follows:
the function of the C element: (1) enlarging a gamma phase region to refine the hot rolled plate structure; (2) the grain structure of the decarburized steel sheet is homogenized.
Function of Si element: (1) the resistivity is effectively improved, and the total iron loss is reduced; (2) the anisotropy of the crystal is reduced, the magnetization is easy, and the magnetic resistance is reduced.
Function of S and Mn elements: MnS is used as an auxiliary inhibitor, and ensures that more fine AlN can be precipitated during normalization to strengthen the inhibition force.
Effect of Al and N elements: AlN is a main inhibitor of high magnetic induction grain-oriented silicon steel.
The function of the P element: the grain boundary is eccentric, so that MnS and AlN are uniformly and finely precipitated, and the inhibition force is improved.
Action of Cu element: (1) enlarging a gamma phase region; (2) and the magnetic performance is stabilized.
Function of Sn element: (1) grain boundary segregation enhances the inhibition force; (2) the inhibitor is promoted to be fine and uniform in size; (3) the primary grain structure of the decarburized plate is uniform.
Function of Sb element: the function is similar to that of Sn, and simultaneously, the {111} crystal grains are prevented from being nucleated at grain boundaries, and the {100} component is added.
Function of Cr element: (1) the resistivity is improved; (2) improve the quality of the bottom layer.
Compared with the prior art, the invention has the beneficial effects that:
the invention adds Sb element and a small amount of Cu in the components of the original oriented silicon steel, carries out casting blank heating at medium temperature, and adopts unique nitriding temperature to match with the temperature, thereby improving the qualified rate of magnetic performance and stably producing the high magnetic induction oriented silicon steel with the magnetic induction of more than 1.90T. The qualified rate of magnetic performance is more than 80%. The magnetic induction value of the oriented silicon steel is improved. The qualified rate of the oriented silicon steel performance is improved by 15-25%.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
Example 1
A method for preparing high magnetic induction oriented silicon steel comprises the following smelting processes: smelting, continuous casting, heating and hot rolling of a casting blank, normalizing pickling, cold rolling, decarburization annealing and nitriding treatment, MgO coating, high-temperature annealing, hot stretching, leveling annealing, insulating layer coating, shearing, packaging and warehousing; wherein:
(1) smelting process
Molten iron is smelted by a converter and refined to obtain molten steel with the components shown in the table 1, the balance of the molten steel is iron, and the impurity content is required to be less than 0.0050%.
Table 1: molten Steel composition (wt%)
| C | Si | Mn | P | S | Als | N | Sn | Cu | Cr | Sb |
| 0.05 | 3.1 | 0.20 | 0.040 | 0.006 | 0.024 | 0.004 | 0.06 | 0.04 | 0.10 | 0.05 |
(2) Continuous casting process
Pouring molten steel when the superheat degree is less than 50 ℃, wherein the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200 mm;
(3) hot rolling process
The heating temperature of the casting blank is 1180 ℃, the heating time is 240min, the rough rolling adopts a mode of 1 pass of the first rack and 3 passes of the second rack, the total rolling is 4 passes, and the thickness of the intermediate blank is 60 mm.
(4) Normalizing process
The first stage of the normalizing process has a holding temperature of 1100 deg.C, holding for 2min, the second stage has a holding temperature of 900 deg.C, a cooling temperature of 800 deg.C, a water spraying temperature of 40-50 deg.C, and a water flow rate of 250m3/h。
(5) Cold rolling process
The cold rolling adopts a Sendzimir twenty-high roll mill, the total reduction rate is 88 percent, the 5-pass rolling is adopted, and the aging rolling is adopted in the 3 rd pass.
(6) Decarburization annealing and nitriding process
The decarburization annealing process is carried out at a decarburization temperature of 850 ℃ for 3-5 min in an atmosphere containing 20% of H2And 80% N2The humidifying temperature of protective gas (volume fraction) is 50-70 ℃; the nitriding treatment process is 75 percent of H2+25％N2In the presence of NH3Nitriding (P)H2O/PH2≤0.04，d.p.＝+10～-10℃)8Is carried out at a temperature of 00-860 ℃ for 30 s. After coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
(7) high temperature annealing process
High temperature annealing is carried out at the speed of 100 ℃/h in N2Raising the temperature to 650 ℃ under the atmosphere and then 75% H2+25％N2The (volume fraction) protective atmosphere is kept at the temperature for 5h, then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/h, and the atmosphere contains 75% of N in the temperature increasing process2+5％H2(volume fraction) of shielding gas, pure H at 1200 deg.C2Protecting, keeping the temperature for 20-40 h, then cooling to 800 ℃ at a speed of 50 ℃/h, and discharging from the furnace when the temperature is lower than 300 ℃;
(8) hot stretching flattening annealing and insulating layer coating process
After coating the insulating layer, it is dried below 480 ℃ and annealed at 900 ℃ by stretching with 0.75% elongation.
Example 2
A method for preparing high magnetic induction oriented silicon steel comprises the following smelting processes: smelting, continuous casting, heating and hot rolling of a casting blank, normalizing pickling, cold rolling, decarburization annealing and nitriding treatment, MgO coating, high-temperature annealing, hot stretching, leveling annealing, insulating layer coating, shearing, packaging and warehousing; wherein:
(1) smelting process
The molten steel with the components shown in the table 2 is obtained after smelting and RH refining, the balance is iron, and the impurity content is required to be less than 0.0050%.
Table 2: molten Steel composition (wt%)
| C | Si | Mn | P | S | Als | N | Sn | Cu | Cr | Sb |
| 0.055 | 3.2 | 0.18 | 0.030 | 0.005 | 0.026 | 0.005 | 0.07 | 0.06 | 0.12 | 0.04 |
(2) Continuous casting process
Pouring molten steel when the superheat degree is less than 50 ℃, wherein the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 220 mm;
(3) hot rolling process
The heating temperature of the casting blank is 1200 ℃, the heating time is 210min, the rough rolling adopts a mode of 1 pass of the first rack and 3 passes of the second rack, the total rolling is 4 passes, and the thickness of the intermediate blank is 50 mm.
(4) Normalizing process
The first stage of the normalizing process is carried out at 1080 deg.C for 3min, and the second stage is carried out at 900 deg.CThe cooling temperature is 780 ℃, the water spraying temperature is 45 ℃, and the water flow is 300m3/h。
(5) Cold rolling process
The cold rolling adopts a Sendzimir twenty-high roll mill, the total reduction rate is 88 percent, the 5-pass rolling is adopted, and the aging rolling is adopted in the 3 rd pass.
(6) Decarburization annealing and nitriding process
The decarburization annealing process comprises maintaining the temperature at 825 deg.C for 4min in an atmosphere containing 15% H2And 85% N2The humidifying temperature of protective gas (volume fraction) is 60 ℃; the nitriding treatment process is 75 percent of H2+25％N2In the presence of NH3Nitriding (P)H2O/PH2Not more than 0.04, d.p. + -. 10-10 ℃) and 830 ℃ for 30 s. After coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
(7) high temperature annealing process
High temperature annealing is carried out at the speed of 100 ℃/h in N2Raising the temperature to 650 ℃ under the atmosphere and then 75% H2+25％N2The (volume fraction) protective atmosphere is kept at the temperature for 5h, then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/h, and the atmosphere contains 75% of N in the temperature increasing process2+5％H2(volume fraction) of shielding gas, pure H at 1200 deg.C2Protecting, keeping the temperature for 20-40 h, then cooling to 800 ℃ at a speed of 50 ℃/h, and discharging from the furnace when the temperature is lower than 300 ℃;
(8) hot stretching flattening annealing and insulating layer coating process
After coating the insulating layer, it is dried below 480 ℃ and annealed at 900 ℃ by stretching with 0.75% elongation.
Example 3
A method for preparing high magnetic induction oriented silicon steel comprises the following smelting processes: smelting, continuous casting, heating and hot rolling of a casting blank, normalizing pickling, cold rolling, decarburization annealing and nitriding treatment, MgO coating, high-temperature annealing, hot stretching, leveling annealing, insulating layer coating, shearing, packaging and warehousing; wherein:
(1) smelting process
The molten steel with the components shown in the table 3 is obtained after smelting and RH refining, the balance is iron, and the impurity content is required to be less than 0.0050%.
Table 3: molten Steel composition (wt%)
| C | Si | Mn | P | S | Als | N | Sn | Cu | Cr | Sb |
| 0.053 | 3.15 | 0.19 | 0.035 | 0.0045 | 0.027 | 0.0049 | 0.065 | 0.07 | 0.11 | 0.035 |
(2) Continuous casting process
Pouring molten steel when the superheat degree is less than 50 ℃, wherein the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 230 mm;
(3) hot rolling process
The heating temperature of the casting blank is 1189 ℃, the heating time is 190min, the rough rolling adopts a mode of 1 pass of the first rack and 3 passes of the second rack, the 4 passes of rolling are performed totally, and the thickness of the intermediate blank is 45 mm.
(4) Normalizing process
The first stage of the normalizing process has a holding temperature of 1090 deg.C, holding temperature for 2min, the second stage has a holding temperature of 900 deg.C, a cooling starting temperature of 780 deg.C, a water spraying temperature of 43 deg.C, and a water flow rate of 280m3/h。
(5) Cold rolling process
The cold rolling adopts a Sendzimir twenty-high roll mill, the total reduction rate is 88 percent, the 5-pass rolling is adopted, and the aging rolling is adopted in the 3 rd pass.
(6) Decarburization annealing and nitriding process
The decarburization annealing process comprises maintaining the temperature at 830 deg.C for 3.5min in an atmosphere containing 10% H2And 90N2(volume fraction) protective gas, humidifying temperature 55 ℃; the nitriding treatment process is 75 percent of H2+25％N2In the presence of NH3Nitriding (P)H2O/PH2Not more than 0.04, d.p. + -. 10-10 ℃) and 830 ℃ for 30 s. After coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
(7) high temperature annealing process
High temperature annealing is carried out at the speed of 100 ℃/h in N2Raising the temperature to 650 ℃ under the atmosphere and then 75% H2+25％N2The (volume fraction) protective atmosphere is kept at the temperature for 5h, then the temperature is increased to 1200 ℃ at the speed of 15-20 ℃/h, and the atmosphere contains 75% of N in the temperature increasing process2+5％H2(volume fraction) of shielding gas, pure H at 1200 deg.C2Protecting, keeping the temperature for 20-40 h, then cooling to 800 ℃ at a speed of 50 ℃/h, and discharging from the furnace when the temperature is lower than 300 ℃;
(8) hot stretching flattening annealing and insulating layer coating process
After coating the insulating layer, it is dried below 480 ℃ and annealed at 900 ℃ by stretching with 0.75% elongation.
Comparative example
A method for preparing high magnetic induction oriented silicon steel comprises the following steps: smelting, continuous casting, heating and hot rolling of a casting blank, normalizing pickling, cold rolling, decarburization annealing and nitriding treatment, MgO coating, high-temperature annealing, hot stretching, leveling annealing, insulating layer coating, shearing, packaging and warehousing.
(1) Smelting process
Molten iron is smelted by a converter and refined to obtain molten steel with the components shown in the table 4, the balance of the molten steel is iron, and the impurity content is required to be less than 0.0050%.
Table 4: molten Steel composition (wt%)
| C | Si | Mn | P | S | Als | N | Sn | Cr |
| 0.045 | 3.15 | 0.10 | 0.015 | 0.007 | 0.029 | 0.008 | 0.05 | 0.01 |
(2) Continuous casting process
Pouring molten steel when the superheat degree is less than 50 ℃, wherein the blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 230 mm;
(3) hot rolling process
The heating temperature of the casting blank is 1150 ℃, the heating time is 150min, the rough rolling adopts a mode of 3 passes of a first rack and 3 passes of a second rack, the total rolling is 6 passes, and the thickness of the intermediate blank is 38 mm;
(4) normalizing process
The normalizing process adopts two-stage normalizing, wherein the first stage temperature is 1120 deg.C, the second stage temperature is 900 deg.C, the cooling temperature is 900 deg.C, the water spraying temperature is 40-50 deg.C, and the water flow is 400m3/h；
(5) Decarburization annealing and nitriding process
The decarburization annealing process is carried out at the decarburization temperature of 810 ℃ for 3min in an atmosphere containing 60-70% of H2And 40% to 30% N2(volume fraction) protective gas, and the humidifying temperature is 75 ℃; the nitriding treatment process is 75 percent of H2+25％N2In the presence of NH3Nitriding (P)H2O/PH2Not more than 0.02, d.p. + 10-10 ℃) for 900 ℃ x 30 s.
The rest process is conventional process.
The indexes of the products of the examples and the comparative examples are shown in Table 5;
table 5: product index
| Name (R) | Amount of feed | B8Percent of pass (percent) of not less than 1.91T | Average magnetic induction (T) |
| Example 1 | 100 rolls | 85％ | 1.910 |
| Example 2 | 50 | 90％ | 1.913 |
| Example 3 | 50 | 95％ | 1.920 |
| Comparative example | 50 | 70％ | 1.890 |
By adopting the technical scheme, compared with the conventional oriented silicon steel preparation process, the technical production of feeding 200 coils is improved, the qualified rate of the corresponding magnetic performance is improved by 15-25%, and the average magnetic induction value is improved by 0.02-0.03T and reaches more than 1.910T.
Claims (3)
1. A method for preparing high magnetic induction oriented silicon steel comprises the following production processes: smelting, continuous casting, heating and hot rolling of a casting blank, normalizing pickling, cold rolling, decarburization annealing and nitriding treatment, MgO coating, high-temperature annealing, hot stretching, leveling annealing, insulating layer coating, shearing, packaging and warehousing; it is characterized in that:
(1) smelting process
Smelting, and refining by using a converter and RH to obtain molten steel, wherein the molten steel comprises, by mass, 0.05-0.06% of C; 3.1-3.3% of Si; 0.16-0.20% of Mn; 0.020-0.040% of P; 0.004-0.006% of S; 0.024-0.028% of Als; 0.004-0.006% of N; 0.06-0.08% of Sn; 0.04-0.08% of Cu; 0.10-0.14% of Cr; 0.03-0.05% of Sb; the impurity content is required to be less than 0.0050 percent;
(2) continuous casting process
The blank drawing speed is 0.8-1.0 m/min, and the thickness of a casting blank is 200-250 mm;
(3) hot rolling process
The heating temperature of the casting blank is 1180-1220 ℃, the heating time is 180-240 min, and the thickness of the intermediate blank is 40-60 mm;
(4) normalizing process
The normalizing process adopts two-stage normalizing, wherein the first stage is at 1060-1100 ℃ for 2-4 min, the second stage is at 850-900 ℃, the starting cooling temperature is 750-800 ℃, the water spraying temperature is 40-50 ℃, and the water flow is 250-350 m3/h；
(5) Cold rolling process
The total cold rolling reduction rate is 84-88%;
(6) decarburization annealing and nitriding treatment and MgO coating process
The decarburization annealing process is to perform decarburization at 800-850 ℃ for 3-5 min, wherein the volume fraction of the atmosphere is 10% -20% of H2And 90% -80% N2Humidifying protective gas at 50-70 ℃; the nitriding treatment process is that the volume fraction of H is 75 percent2+25％N2In the presence of NH3Nitriding at 800-860 ℃ for 30 s; after coating the MgO coating, drying and sintering at 500-600 ℃, and then coiling;
(7) high temperature annealing process
The high-temperature annealing is carried out at the speed of 50-100 ℃/h in N2Raising the temperature to 600-650 ℃ in the atmosphere and then adding H with the volume fraction of 75 percent2+25％N2Protection ofKeeping the temperature of the atmosphere at the temperature for 5-10 h, then raising the temperature to 1200 ℃ at the speed of 15-20 ℃/h, wherein the volume fraction of the atmosphere in the temperature raising process is 75% N2+5％H2The protective gas is pure H at 1200 DEG C2Protecting, keeping the temperature for 20-40 h, then cooling to below 800 ℃ at a speed of 50 ℃/h, and discharging from the furnace when the temperature is lower than 300 ℃;
(8) hot stretching flattening annealing and insulating layer coating process
After coating the insulating layer, drying the coating at a temperature below 500 ℃ and carrying out stretching and flattening annealing with 0.25 to 0.75 percent of elongation at a temperature of about 800 to 900 ℃.
2. The method for preparing high-induction grain-oriented silicon steel as claimed in claim 1, wherein in the step 3, the rough rolling is performed for 4 times in a mode of 1 pass of the first stand and 3 passes of the second stand.
3. The method for preparing high-induction grain-oriented silicon steel as claimed in claim 1, wherein 5 passes of rolling are adopted in step 5, and aging rolling is adopted in the 3 rd pass.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112626447A (en) * | 2020-12-14 | 2021-04-09 | 海安华诚新材料有限公司 | Atmosphere control process of high-magnetic-induction oriented silicon steel with excellent magnetism |
| CN113073177A (en) * | 2021-03-17 | 2021-07-06 | 武汉钢铁有限公司 | Control method for improving components of oxidation layer of oriented steel |
| CN114645207A (en) * | 2022-03-22 | 2022-06-21 | 包头钢铁（集团）有限责任公司 | Manufacturing method of acquired inhibitor high-magnetic-induction oriented silicon steel |
| WO2022127447A1 (en) * | 2020-12-17 | 2022-06-23 | 首钢智新迁安电磁材料有限公司 | Method for preparing bottom-layer-free oriented silicon steel and product obtained thereby |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4824493A (en) * | 1986-02-14 | 1989-04-25 | Nippon Steel Corporation | Process for producing a grain-oriented electrical steel sheet having improved magnetic properties |
| JP2000199014A (en) * | 1998-12-28 | 2000-07-18 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet |
| CN101775547A (en) * | 2009-12-31 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of high magnetic induction grain-oriented silicon steel strip |
| CN102787276A (en) * | 2012-08-30 | 2012-11-21 | 宝山钢铁股份有限公司 | High magnetic induction oriented silicon steel and manufacturing method thereof |
| CN103805918A (en) * | 2012-11-15 | 2014-05-21 | 宝山钢铁股份有限公司 | High-magnetic induction oriented silicon steel and production method thereof |
| CN104726761A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | Production method of low-cost high-magnetic induction oriented silicon steel |
| CN105525087A (en) * | 2015-10-10 | 2016-04-27 | 广东盈泉高新材料有限公司 | Method for improving quality of bottom layer of oriented silicon steel |
| CN107746942A (en) * | 2017-12-15 | 2018-03-02 | 武汉钢铁有限公司 | A kind of B800 >=1.962T low temperature superelevation magnetic induction grain-oriented silicon steel and production method |
| CN108018489A (en) * | 2017-12-15 | 2018-05-11 | 武汉钢铁有限公司 | A kind of economical high magnetic induction grain-oriented silicon steel and production method |
| CN109554525A (en) * | 2018-12-03 | 2019-04-02 | 武汉钢铁有限公司 | A kind of manufacturing method of mirror surface-oriented silicon steel |
| CN110055393A (en) * | 2019-04-28 | 2019-07-26 | 首钢智新迁安电磁材料有限公司 | A kind of thin gauge low temperature high magnetic induction grain-oriented silicon steel strip production method |
-
2019
- 2019-09-30 CN CN201910938854.7A patent/CN110791635A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4824493A (en) * | 1986-02-14 | 1989-04-25 | Nippon Steel Corporation | Process for producing a grain-oriented electrical steel sheet having improved magnetic properties |
| JP2000199014A (en) * | 1998-12-28 | 2000-07-18 | Kawasaki Steel Corp | Production of grain oriented silicon steel sheet |
| CN101775547A (en) * | 2009-12-31 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of high magnetic induction grain-oriented silicon steel strip |
| CN102787276A (en) * | 2012-08-30 | 2012-11-21 | 宝山钢铁股份有限公司 | High magnetic induction oriented silicon steel and manufacturing method thereof |
| CN103805918A (en) * | 2012-11-15 | 2014-05-21 | 宝山钢铁股份有限公司 | High-magnetic induction oriented silicon steel and production method thereof |
| CN104726761A (en) * | 2013-12-23 | 2015-06-24 | 鞍钢股份有限公司 | Production method of low-cost high-magnetic induction oriented silicon steel |
| CN105525087A (en) * | 2015-10-10 | 2016-04-27 | 广东盈泉高新材料有限公司 | Method for improving quality of bottom layer of oriented silicon steel |
| CN107746942A (en) * | 2017-12-15 | 2018-03-02 | 武汉钢铁有限公司 | A kind of B800 >=1.962T low temperature superelevation magnetic induction grain-oriented silicon steel and production method |
| CN108018489A (en) * | 2017-12-15 | 2018-05-11 | 武汉钢铁有限公司 | A kind of economical high magnetic induction grain-oriented silicon steel and production method |
| CN109554525A (en) * | 2018-12-03 | 2019-04-02 | 武汉钢铁有限公司 | A kind of manufacturing method of mirror surface-oriented silicon steel |
| CN110055393A (en) * | 2019-04-28 | 2019-07-26 | 首钢智新迁安电磁材料有限公司 | A kind of thin gauge low temperature high magnetic induction grain-oriented silicon steel strip production method |
Non-Patent Citations (1)
| Title |
|---|
| 李霞等: "低温取向硅钢常化工艺和渗氮工艺对组织、织构和磁性能的影响 ", 《工程科学学报》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112626447A (en) * | 2020-12-14 | 2021-04-09 | 海安华诚新材料有限公司 | Atmosphere control process of high-magnetic-induction oriented silicon steel with excellent magnetism |
| WO2022127447A1 (en) * | 2020-12-17 | 2022-06-23 | 首钢智新迁安电磁材料有限公司 | Method for preparing bottom-layer-free oriented silicon steel and product obtained thereby |
| CN113073177A (en) * | 2021-03-17 | 2021-07-06 | 武汉钢铁有限公司 | Control method for improving components of oxidation layer of oriented steel |
| CN113073177B (en) * | 2021-03-17 | 2022-08-09 | 武汉钢铁有限公司 | Control method for improving components of oxidation layer of oriented steel |
| CN114645207A (en) * | 2022-03-22 | 2022-06-21 | 包头钢铁（集团）有限责任公司 | Manufacturing method of acquired inhibitor high-magnetic-induction oriented silicon steel |
| CN115505708A (en) * | 2022-09-23 | 2022-12-23 | 无锡普天铁心股份有限公司 | Flattening, stretching and annealing method for reducing iron loss of oriented silicon steel |
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