CN101748257B - Method for manufacturing oriented silicon steel - Google Patents
Method for manufacturing oriented silicon steel Download PDFInfo
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- CN101748257B CN101748257B CN2008102297642A CN200810229764A CN101748257B CN 101748257 B CN101748257 B CN 101748257B CN 2008102297642 A CN2008102297642 A CN 2008102297642A CN 200810229764 A CN200810229764 A CN 200810229764A CN 101748257 B CN101748257 B CN 101748257B
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Abstract
The invention discloses a method for manufacturing directional silicon steel. The method is characterized in that a rolling and treating process adopts a manufacture process of triple cold rolling, twice intermediate annealing, and once MgO coating, and finally carrying out high temperature annealing. One-pass roll separating force in the triple rolling is reduced, the internal tissue of the steel is uniform, so the time for high temperature annealing is reduced by 20 to 30 percent, and a product with strong (110)[001] structure is finally obtained. The method not only can obviously improve the electromagnetic performance (iron loss reduces but magnetic induction increases), ensures that the iron loss P1.7 is reduced by about 0.08W/kg, ensures the magnetic induction B8 is improved by about 0.07T, not only ensures that the product is improved from half to one grade, but also ensures that the total production time is obviously reduced, the total production time is remarkably shortened, thereby improving the manufacture efficiency of the directional silicon steel.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate to a kind of production method of silicon steel, specifically is a kind of production method that improves the oriented silicon steel performance.
Background technology
Oriented silicon steel can be divided into common magnetic induction grain-oriented silicon steel (GO steel) and high magnetic induction grain-oriented silicon steel (Hi-B steel) two classes by cold-rolling process and electromagnetic performance.Usually adopt the medium draft cold-rolling practice of secondary to produce GO steel (with MnS as inhibitor).And the Hi-B steel usually adopts a heavy reduction rate cold-rolling practice, its magnetic high and stable (with AlN as inhibitor); Also can adopt the medium draft cold-rolling practice of secondary to produce the Hi-B steel, but magnetic low and unstable (with MnSe (or MnS)+Sb as inhibitor).
Also do not adopt at present the report of three cold-rolling practice production oriented silicon steels.Major cause may be can make the operation lengthening owing to adopt three cold-rolling practices to produce oriented silicon steel, complex procedures, production time and cost all can increase, lumber recovery reduces, take all factors into consideration cost performance, further study so three cold-rolling practices are not produced oriented silicon steel.
Summary of the invention
The present invention discloses a kind of method that improves the oriented silicon steel performance, can not only significantly improve electromagnetic performance (iron loss reduces and magnetic strength increases), and total production time is significantly reduced, thereby improve oriented silicon steel production efficiency.
The technology of the present invention uses MnS as main inhibitor at common orientation silicon steel, and its technical process is:
Smelting → slab → heating → hot rolling → once cold rolling → first time process annealing → secondary cold-rolling → process annealing the second time → three are time cold rolling → be coated with MgO → high temperature annealing.
Concrete method is, the composition that requires of oriented silicon steel is smelted routinely, casts slab, is cooled to behind the normal temperature slab be carried out surface treatment, and the slab after the processing is put into process furnace and carried out heat, carries out hot rolling after coming out of the stove, low temperature batches.
Be characterized in that rolling and treatment process adopts three cold rolling, twice process annealing, once is coated with the production technique of MgO, adopts process annealing for the first time after the once cold rolling; Carry out the process annealing second time after for the second time cold rolling, the MgO coating is cleaned and applied in cold rolling for the third time back to steel plate, carries out high temperature annealing at last.In order to save facility investment and to utilize existing place, adopt secondary milling train when rolling for the third time, steel plate is carried out back and forth rolling, the both sides of milling train are furnished with reeling machine simultaneously.
Concrete composition of the present invention and technology are as follows:
1) composition, by weight percentage: C 0.03%～0.05%, and Si 2.8%～3.4%, Mn 0.05%～0.010%P＜0.01%, S 0.015%～0.030%, and surplus is iron and unavoidable impurities.
2) three cold rollings
Adopt three cold-rolling practices to be rolled, three times cold rolling draft is: once cold rolling draft: 39%～44%; Secondary cold-rolling draft: 45%～50%; Three cold rolling drafts 58%～63%.
3) twice intermediate annealing process
Wet atmosphere 10%～20%H is all adopted in twice process annealing
2+ 90%～80%N
2Protection makes crystal grain generation primary recrystallization, eliminates work hardening, for the first time intermediate annealing process be temperature at 830～880 ℃, the time is 2～5min, dew point: 35～45 ℃; Machining stress and part decarburization are eliminated in process annealing for the first time, and carbon content is controlled at 200～300PPm, for the second time intermediate annealing process be temperature at 800～830 ℃, the time is 3～5min, dew point: 40～50 ℃.Eliminate work hardening for the second time and C content is reduced to below the 30ppm;
4) be coated with MgO
After cold rolling for the third time, sample surfaces is cleaned, after the coating MgO coated and dried, sample is put into high-temperature annealing furnace carry out high temperature annealing.
5) high temperature annealing
After cold rolling for the third time, sample surfaces cleans, and applies the MgO coating, and after the oven dry, sample is put into high-temperature annealing furnace carry out high temperature annealing,
Heat-up rate with 500～600 ℃/h is heated rapidly to 500～600 ℃ with three rolled samples, at pure N
2Protective atmosphere is insulation 1～2h down; Remove Mg (OH)
2After decomposing the water that produces, protective atmosphere changes 75～100%H into
2+ 0%～25%N
2, the heat-up rate with 150～300 ℃/h is rapidly heated 800～900 ℃ again, and insulation 1～2h makes three rolled samples generate the recrystallized structure that contains a small amount of Gauss's nucleus; Heat-up rate with≤20 ℃/h is heated to 1150～1200 ℃ then, at pure H
2Protective atmosphere is insulation 20～40h down; The temperature-fall period protective atmosphere changes 75～100%H into
2+ 0%～25%%N
2, cool to 700 ℃ with the speed of≤20 ℃/h; Protective atmosphere changes pure N into
2Come out of the stove for＜300 ℃.
The present invention also can adopt conventional high-temperature annealing process, promptly is raised to 550～650 ℃ with about 50 ℃/h speed; At 75%H
2+ 25%N
2Protective atmosphere insulation 1.0～1.5h is down removed constitution water; Be raised to 1150～1200 ℃ with 15～20 ℃/h speed; At pure H
2Protective atmosphere is insulation 20～40h down; Outage back shielding gas changes 75%H into
2+ 25%N
2Be as cold as about 700 ℃; Shielding gas changes N into
2Be as cold as＜300 ℃ come out of the stove.
The present invention is directed to common orientation silicon steel (GO), use MnS as main inhibitor, under the situation that does not increase equipment, adopt three cold-rolling practices to produce oriented silicon steel, because three times the power of one-pass roller when rolling diminishes, the interior tissue of steel is even, thereby make the high temperature annealing time decreased, reduced 20%～30%, finally obtained to have the product of strong (110) [001] texture.
The present invention can not only significantly improve electromagnetic performance (iron loss reduces and magnetic strength increases), can make iron loss P1.7 reduce 0.08W/kg approximately, makes magnetic strength B8 improve 0.07T approximately.Can make product improve half to one trade mark; And total production time is significantly reduced, can significantly shorten total production time, thereby improve oriented silicon steel production efficiency.
Embodiment
Technical process of the present invention is: the smelting → slab → heating → hot rolling → once cold rolling → first time process annealing → secondary cold-rolling → process annealing second time → three are time cold rolling → be coated with MgO → high temperature annealing.
Concrete method is, the composition that requires of oriented silicon steel routinely, carry out vacuum melting, cast slab, be cooled to behind the normal temperature slab be carried out surface treatment, the slab after the processing is put into process furnace and is carried out heat, carry out hot rolling after coming out of the stove, low temperature batches, be characterized in that rolling and treatment process adopts three cold rolling, twice process annealing, once is coated with the production technique of MgO, adopts process annealing for the first time after the once cold rolling; Machining stress and part decarburization are eliminated in process annealing for the first time, carry out process annealing second time after for the second time cold rolling, eliminate the work hardening second time and C content is reduced to below the 30ppm; The MgO coating is cleaned and applied in cold rolling for the third time back to steel plate, carries out high temperature annealing at last.
Concrete composition of the present invention and technology are as follows:
1) composition is by weight percentage: C 0.03%～0.05%, and Si 2.8%～3.4%, Mn0.05%～0.10%, and P＜0.01%, S 0.015%～0.030%, and surplus is iron and unavoidable impurities.
2) three cold rollings
Adopt three cold-rolling practices to be rolled, three times cold rolling draft is: once cold rolling draft: 39%～44%; Secondary cold-rolling draft: 45%～50%; Three cold rolling drafts 58%～63%.
3) twice intermediate annealing process
Wet atmosphere 10%～20%H is all adopted in twice process annealing
2+ 90%～80%N
2Protection makes crystal grain generation primary recrystallization, eliminates work hardening, and intermediate annealing process is 830～880 ℃ for the first time, and the time is 2～5min, dew point: 35～45 ℃; Process annealing for the first time is controlled at 200～300PPm with carbon content, and intermediate annealing process is 800～830 ℃ for the second time, and the time is 3～5min, dew point: 40～50 ℃.Process annealing for the second time is controlled at carbon content below the 30PPm.
4) be coated with MgO
After cold rolling for the third time, sample surfaces is cleaned, apply the MgO coating, after the oven dry, sample is put into high-temperature annealing furnace carry out high temperature annealing.
5) high temperature annealing
After cold rolling for the third time, sample surfaces cleans, and applies the MgO coating, and after the oven dry, sample is put into high-temperature annealing furnace carry out high temperature annealing,
The present invention is heated rapidly to 500～600 ℃ with the heat-up rate of 500～600 ℃/h with three rolled samples, is incubated 1～2h under pure N2 protective atmosphere; Remove Mg (OH)
2After decomposing the water that produces, protective atmosphere changes 75～100%H into
2+ %N
2, the heat-up rate with 20～30 ℃/h is rapidly heated 800～900 ℃ again, and insulation 1～2h makes three rolled samples generate the recrystallized structure that contains a small amount of Gauss's nucleus; Heat-up rate with≤20 ℃/h is heated to 1150～1200 ℃ then, at pure H
2Protective atmosphere is insulation 20～40h down; The temperature-fall period protective atmosphere changes 75～100%H into
2+ %N
2, cool to 700 ℃ with the speed of≤20 ℃/h; Protective atmosphere changes pure N into
2Come out of the stove for＜300 ℃.
High temperature annealing of the present invention also can adopt conventional annealing way, promptly is raised to 550～650 ℃ with about 50 ℃/h speed; At 75%H
2+ 25%N
2Protective atmosphere insulation 1.0～1.5h is down removed constitution water; Be raised to 1150～1200 ℃ with 15～20 ℃/h speed; At pure H
2Protective atmosphere is insulation 20～40h down; Outage back shielding gas changes 75%H into
2+ 25%N
2Be as cold as about 700 ℃; Shielding gas changes N into
2Be as cold as＜300 ℃ come out of the stove.
In order to be analyzed, adopt same hot-rolled sheet according to traditional once cold rolling method and the secondary cold-rolling method is rolled and back operation experiment, comparing result is as shown in table 1:
Different cold-rolling practices of table 1 and draft are to Effect on Performance
As can be seen from Table 1, adopt three cold-rolling practices and three different drafts of cold rolling employing that the performance of silicon steel is produced very big influence, the iron loss of three cold-rolling practice products is lower than secondary cold-rolling method, and therefore magnetic strength makes the performance of silicon steel improve than the height of secondary cold-rolling method.
Study of the influence of different high temperature annealing schemes to electromagnetic performance
(cold rolling draft is respectively: be divided into two rouleaus 43%, 48%, 58%) with three cold rolling coils of a volume, carry out high temperature annealing by high temperature annealing scheme one (conventional annealing mode) and high temperature annealing scheme two respectively, the finished product are carried out electromagnetic performance detect, the result is as shown in table 2:
The different high temperature annealing systems of table 2 are to Effect on Performance
| The high temperature annealing scheme | Always at time/h | Amount detection | P 1.5Mean value/W/kg | P 1.7Mean value/W/kg | B 8/T | Remarks |
| One | 120～150 | 10 | 0.949 | 1.362 | 1.817 | Comparative example 5 |
| Two | 90～120 | 10 | 0.937 | 1.359 | 1.820 | Embodiment |
Can find out from table 2, adopt the high temperature annealing scheme two and the electromagnetic performance of scheme one to be more or less the same, but always shorten about 30h, significantly save the energy, and improve production efficiency, save time 25% than the inferior cold-rolling practice of secondary in the furnace annealing time.
Table 3 is a most preferred embodiment of the present invention
Table 3
| Cold rolling draft proportioning/% | Process annealing (min) | Process annealing (min) | High temperature annealing (h) | Amount detection | P 1.5Mean value/W/kg | P 1.7Mean value/W/kg | B 8/T | |
| Embodiment 1 | 39、47、60 | 3 | 4 | 8 | 10 | 0.937 | 1.354 | 1.801 |
| Embodiment 2 | 40、45、58 | 4 | 4 | 7 | 10 | 0.935 | 1.351 | 1.814 |
| Embodiment 3 | 42、50、62 | 2 | 3 | 7 | 10 | 0.936 | 1.357 | 1.819 |
| Embodiment 4 | 39、46、58 | 5 | 5 | 8 | 10 | 0.936 | 1.352 | 1.806 |
| Embodiment 5 | 44、50、63 | 2 | 3 | 7 | 10 | 0.934 | 1.349 | 1.821 |
Claims (2)
1. the production method of an oriented silicon steel, it is characterized in that, rolling and treatment process adopts three cold rolling, twice process annealing, once is coated with MgO, carry out high temperature annealing at last, its technical process is: the smelting → slab → heating → hot rolling → once cold rolling → first time process annealing → secondary cold-rolling → process annealing second time → three are time cold rolling → be coated with MgO → high temperature annealing;
1) three cold rolling drafts are: once cold rolling draft: 39%～44%; Secondary cold-rolling draft: 45%～50%; Three cold rolling drafts 58%～63%;
2) wet atmosphere 10%～20%H is all adopted in twice process annealing
2+ 90%～80%N
2Protection makes crystal grain generation primary recrystallization, eliminates work hardening, intermediate annealing process for the first time, temperature be at 830～880 ℃, time 2～5min, dew point: 35～45 ℃, machining stress and part decarburization are eliminated in process annealing for the first time, and carbon content is controlled at 200～300ppm; For the second time intermediate annealing process is, temperature is at 800～830 ℃, and the time is 3～5min, dew point: 40～50 ℃, eliminate work hardening for the second time and C content is reduced to below the 30ppm.
2. the production method of a kind of oriented silicon steel according to claim 1, it is characterized in that, after cold rolling for the third time, sample surfaces cleans, apply the MgO coating, after the oven dry, sample is put into high-temperature annealing furnace carry out high temperature annealing, heat-up rate with 500～600 ℃/h is heated rapidly to 500～600 ℃ with three rolled samples, at pure N
2Protective atmosphere is insulation 1～2h down; Remove Mg (OH)
2After decomposing the water that produces, protective atmosphere changes 75～100%H into
2+ 0%～25%N
2, the heat-up rate with 150～300 ℃/h is rapidly heated 800～900 ℃ again, and insulation 1～2h makes three rolled samples generate the recrystallized structure that contains a small amount of Gauss's nucleus; Heat-up rate with≤20 ℃/h is heated to 1150～1200 ℃ then, at pure H
2Protective atmosphere is insulation 20～40h down; The temperature-fall period protective atmosphere changes 75～100%H into
2+ 0%～25%%N
2, cool to 700 ℃ with the speed of≤20 ℃/h; Protective atmosphere changes pure N into
2Be as cold as＜300 ℃ come out of the stove.
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| CN2008102297642A CN101748257B (en) | 2008-12-12 | 2008-12-12 | Method for manufacturing oriented silicon steel |
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| CN101748257B true CN101748257B (en) | 2011-09-28 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102443736B (en) * | 2010-09-30 | 2013-09-04 | 宝山钢铁股份有限公司 | Method for producing high magnetic flux-density oriented silicon steel product |
| CN102560048B (en) * | 2010-12-17 | 2013-10-16 | 鞍钢股份有限公司 | Preparation process of ordinary oriented silicon steel |
| CN102534364B (en) * | 2010-12-17 | 2013-09-04 | 鞍钢股份有限公司 | Production method capable of improving magnetic property of common grain-oriented silicon steel |
| CN103031420B (en) * | 2011-09-30 | 2014-12-03 | 宝山钢铁股份有限公司 | Production method of oriented silicon steel with excellent magnetic performance |
| CN102534158B (en) * | 2012-02-03 | 2014-04-30 | 无锡华精新材股份有限公司 | Production process of high-precision cold-rolled oriented silicon steel strips |
| CN103266205A (en) * | 2013-04-12 | 2013-08-28 | 南通新京隆电器有限公司 | EI type orientation silicon steel plate annealing process |
| CN103695755B (en) * | 2013-11-28 | 2016-03-09 | 安徽银力铸造有限公司 | A kind of preparation method of electrical steel for automobile motor |
| KR101642281B1 (en) * | 2014-11-27 | 2016-07-25 | 주식회사 포스코 | Oriented electrical steel sheet and method for manufacturing the same |
| CN105018847B (en) * | 2015-07-15 | 2017-04-19 | 东北大学 | Extremely-thin oriented silicon steel plate based on two-roll thin-strip continuous casting and manufacturing method of extremely-thin oriented silicon steel plate |
| CN108339851B (en) * | 2017-12-21 | 2019-08-09 | 东北大学 | A kind of cold rolling of oriented silicon steel strip in razor-thin and method for annealing |
| CN110066908B (en) * | 2019-05-15 | 2020-10-02 | 武汉钢铁有限公司 | Production method for improving edge grain state of high-magnetic-induction oriented silicon steel |
| CN115532827B (en) * | 2022-10-31 | 2023-09-15 | 江苏贯森新材料科技有限公司 | Preparation method of ultrathin stainless steel strip |
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|---|---|---|---|---|
| CN1191900A (en) * | 1997-02-28 | 1998-09-02 | 阿姆科公司 | Method for producing silicon-chromium grain oriented electrical steel |
| CN1414119A (en) * | 2002-04-28 | 2003-04-30 | 武汉钢铁(集团)公司 | Method of producing common orientation silicon steel |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191900A (en) * | 1997-02-28 | 1998-09-02 | 阿姆科公司 | Method for producing silicon-chromium grain oriented electrical steel |
| CN1414119A (en) * | 2002-04-28 | 2003-04-30 | 武汉钢铁(集团)公司 | Method of producing common orientation silicon steel |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2008-261033A 2008.10.30 |
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