CN1548569A - Indirectional electric steel plate without corrugated fault and its making process - Google Patents
Indirectional electric steel plate without corrugated fault and its making process Download PDFInfo
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- CN1548569A CN1548569A CNA031168906A CN03116890A CN1548569A CN 1548569 A CN1548569 A CN 1548569A CN A031168906 A CNA031168906 A CN A031168906A CN 03116890 A CN03116890 A CN 03116890A CN 1548569 A CN1548569 A CN 1548569A
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- corrugated
- roughing
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Abstract
The indirectional electrical steel plate without corrugated fault has the components including C0.006-0.01 wt%, Si 0-2.0 wt%, Al 0-0.4 wt% and Mn not higher than 1.0 wt% except Fe and inevitable impurity, with the Si/C ratio being 180-260. Its making process includes continuously casting plate blank; hot rough rolling for not more than 4 gates with total percentage reduction not less than 80 %, at least one gate of percentage reduction not less than 40 % and finish rolling temperature not lower than 980 deg.c; finish rolling with at least one roller of roughness not lower than 5 micron; and winding at temperature not lower than 710 deg.c. The optimized components and technological process mikes the steel plate product free from corrugated fault and high in physical performance. The omitting of normalizing step results in lowered production cost.
Description
Technical field
The present invention relates to the non-oriented electromagnetic steel sheet manufacturing technology, particularly non-oriented electromagnetic steel sheet overcomes the manufacturing technology of corrugated defective.
Background technology
Non-oriented electromagnetic steel sheet is mainly used in the core material of producing motor.The component of non-oriented electrical steel is (weight percent): C＜0.01%, Si+Al＞1.50%, Mn＜1.0%, all the other are iron and unavoidable impurities.Adopt continuous metal cast process to produce non-oriented electrical steel, because in heating and the course of hot rolling, α γ phase transformation does not take place substantially, huge (100) column crystal of cast structure can not be thoroughly broken because dynamic recovery and recrystallize are slow in course of hot rolling, forming very thick edge near the center of hot-rolled sheet thickness of slab rolls to the deformed grains of extending, its width is between 0.2mm～0.5mm, mainly be that deformation stores can extremely low (100)＜011〉fiber texture, be difficult to take place recrystallize in the cold rolling afterwards and annealing process, cause along rolling on the production board surface to rough corrugated defective, it is about 2% that the lamination coefficient of electrical sheet is reduced, and magnetic degenerates, decline of insulating film interlamination resistance and generation magnetic are inhomogeneous.
For reducing non-oriented electromagnetic steel sheet corrugated defective, in casting process, adopt electromagnetic stirring method (as the public clear 53-114609 of the disclosed spy of Japanese patent gazette number) now mostly, prevent the corrugated defective, implement this method and will carry out the substantial equipment transformation, and electromagnetic stirring equipment is difficult for operation and maintenance.
The low temperature teeming practice (as the public clear 49-39526 communique of the disclosed spy of Japanese patent gazette) of employing is also arranged, to prevent the corrugated defective.But when adopting the low temperature teeming practice, casting process is wayward, and inclusion is difficult for come-up in the crystallizer, and The amount of inclusions increases in the continuously cast bloom, influences end product quality.
Also have the method (as the public clear 53-2332 communique of the disclosed spy of Japanese patent gazette) that adopts control roughing finish to gauge, the roughing finishing temperature is controlled to be＞900 ℃, last percentage pass reduction of roughing＞50% disappears production board corrugated defective; So not only require roughing unit capacity height, and last percentage pass reduction of roughing is excessive, causes the template of rough rolling plate blank to be difficult to control, influence the finish rolling operation.
Or, adopt the method (as the public clear 62-54023 communique of the disclosed spy of Japanese patent gazette) of control finish rolling finishing temperature, the cooling of not spraying water in 1～7 second after control finish rolling finishing temperature＞1000 ℃, the hot rolling, and batch at＜700 ℃, to prevent the corrugated defective; This method requires continuous blank heating temperature to be increased to more than 1250 ℃, and the easy like this continuously cast bloom waist that collapses that causes influence that roller-way is carried and at the inner generation of continuously cast bloom internal fissure.
Summary of the invention
The object of the present invention is to provide a kind of non-oriented electromagnetic steel sheet and manufacture method thereof of not having the corrugated defective; both can eliminate the shortcoming of aforesaid method; need not to carry out large-scale scrap build again; and can save hot-rolled sheet normalizing operation; and can eliminate corrugated defective (highly＞3 the corrugated defective incidence of μ m is less than 5%) fully, reduce production process, reduce production costs.
For achieving the above object, the non-oriented electromagnetic steel sheet of no corrugated defective of the present invention, its component is:
C：0.006％～0.01％，
0＜Si≤2.0％
0＜Al≤0.4％
Mn≤1.0％
All the other are Fe and inevitably are mingled with;
Below all represent with weight percent.
Further, the preferable range of described C is 0.007%～0.009%.
Again, the ratio of described Si/C: 180～260.
The manufacture method of the non-oriented electromagnetic steel sheet of no corrugated defective of the present invention may further comprise the steps:
A, slab casting;
B, strand heating, roughing;
C, finish rolling;
D, batch.
Wherein, slab casting is preferably continuous casting process among the described step a.
Roughing passage among the described step b≤4 passages, roughing accumulative total draft 〉=80% wherein has draft 〉=40% of a passage at least, roughing finishing temperature 〉=980 ℃.
Preferably have draft 〉=40% of 2 above passages among the described step b in the roughing process again.
Preferred roughing finishing temperature in the described step b roughing process 〉=1000 ℃.
Wherein, in the finish rolling process, in the several frames in finish rolling tandem rolling unit front, have at least a frame to adopt the comparatively coarse roll of roll surface, roll surface roughness 〉=5 μ m among the described step c;
Preferred roll roll surface roughness 〉=7 μ m in the described step c finish rolling process.
Hot-rolled sheet in the described steps d 〉=710 ℃ high temperature batches.
The present invention at first from optimize the code non-oriented electrical steel composition start with, promptly suitably increase C content to 0.006%～0.01% in the steel, be preferably 0.007%～0.009%, keep Si/C than between 180～260 simultaneously, so heat at continuously cast bloom, part α γ circulating phase-change takes place in the course of hot rolling, destroy (100)＜011 that the thick low deformation in hot-rolled sheet centre stores energy〉deformed grains, prevent the corrugated defective, and in follow-up (cold-rolled steel strip) continuous annealing process, decarburization (C content≤0.010% in the steel) easily fast, keep unit operation speed, boost productivity;
Secondly, optimize hot rolling technology, especially optimize roughing technology, require roughing≤4 passages, roughing adds up draft 〉=80%, wherein has draft 〉=40% of a passage at least, draft 〉=40% that 2 above passages are preferably arranged, promptly so-called high rolled form factor (m=2 (H
I-1-H
i)
1/2/ (H
I-1+ H
i), H wherein
I-1Thickness, H for the rolling front spring feed mill of i passage
iGo out the thickness of milling train for the rolling back of i passage steel plate) the roughing rolling technique, purpose is to destroy (100) column crystal of as-cast structure, improves recrystallize isometry rate.
As everyone knows, in the roughing process, adopt passage to depress greatly, can reduce the roughing passage, shorten the roughing time, reduce frequency of exposure and time between steel plate and the roll, thereby the temperature drop of minimizing roughing process, guarantee that the rough rolling plate blank temperature is at recrystallize critical temperature (T
Cr) more than be to obtain high recrystallize rate, the most important condition of high isometry rate tissue.Secondly the stacking fault energy of the ferrous alloy of bcc structure is higher, when the deformation work of unit time hangs down, not only the inner deformation storage of alloy can be low, and deformation substructure such as dislocation are easy to climb and Recovery Process such as slippage are handed in hot activation, dislocation desity is reduced rapidly, deformation stores can very fast release, and the recrystallize motivating force reduces rapidly, hinders recrystallize and takes place; And deformation substructure density reduces rapidly, and the recrystallize nucleus reduces greatly at deformation substructure forming core probability, and main forming core on crystal boundary and subgrain boundary, and grows up rapidly, causes the tissue odds that organizes recrystallize not exclusively to reach recrystallize takes place even.Adopt passage to depress rolling (being that high rolled form factor is rolling) greatly, (speed of deformation is proportional to because speed of deformation increases
Wherein Δ h is the absolute draft amount for the i passage, H is an i passage front spring thickness), the deformation work of unit time increases, unit time steel plate deformation in the steel plate stores and can increase, be to destroy column crystal, obtain an essential condition of high recrystallize rate, high isometry rate tissue, simultaneously also be destroy original (100) column crystal position to essential condition.On the deformation mode: percentage pass reduction is big, help increasing the frictional force of roll and surface of steel plate, cause that the steel plate shearing deformation quantity increases, shear deformation increases along steel plate thickness direction penetration depth, rollingly change complicated state of strain into by plane strain state, it is big that lattice rotates degree of crook, and deformation stores can be high, destroy columanar structure's effect and increase, promote columanar structure that recrystallize takes place.In addition, percentage pass reduction is big, and the deformation heat effect is also bigger, partly compensates the thermosteresis in the operation of rolling, improves the temperature in the steel plate deformation process, promotes the recrystallize of deformed microstructure.Control roughing finishing temperature 〉=980 ℃, preferred finishing temperature 〉=1000 ℃, purpose is to promote the rough rolling plate blank recrystallize;
Once more, in the finish rolling process, in the several frames in tandem rolling unit front, have at least a frame to adopt the comparatively coarse roll of roll surface, the roll surface roughness is μ m at least 〉=5, preferred 〉=7 μ m, purpose is the frictional force that increases between steel plate and the roll, strengthen the shear deformation of steel plate, increase the penetration depth of shear deformation along the thickness of slab direction, reduce the plane strain district in steel plate centre, the deformation that increases the steel plate center stores energy, promote the recrystallize of hot-rolled sheet, destroy thick (100) columanar structure of original as cast condition.
At last, hot-rolled sheet after the finish rolling batches at 〉=710 ℃ of following high temperature, realize hot-rolled sheet self-annealing process, because 710 ℃ of critical temperatures that are higher than recrystallize, static recrystallize takes place at 710 ℃ in hot-rolled sheet, eliminates (100)＜011〉deformed microstructure, the isometry of realization hot-rolled sheet tissue, and promote to improve finished product magnetic by the hot-rolled sheet grain growth.
Beneficial effect of the present invention through said components and process optimization, can be eliminated the corrugated defective fully, and can omit the hot-rolled sheet normalizing operation in the existing manufacturing process, has reduced production cost; And the non-oriented electromagnetic steel sheet physicals of manufacturing is improved.
Embodiment
Below in conjunction with embodiment the present invention is described in further detail.
Table 1, table 2 have been listed the proportioning and the physicals of embodiments of the invention and comparative example respectively.
Table 1
| Component (weight percent wt%) | |||||
| ????C | ????Si | ????Al | ????Mn | All the other are iron and unavoidable impurities | |
| Embodiment 1 | ????0.008 | ????1.65 | ????0.30 | ????0.25 | |
| Embodiment 2 | ????0.007 | ????1.56 | ????0.33 | ????0.15 | The same |
| Embodiment 3 | ????0.009 | ????1.67 | ????0.28 | ????0.25 | The same |
| Embodiment 4 | ????0.0065 | ????1.625 | ????0.28 | ????0.19 | The same |
| Comparative example 1 | ????0.003 | ????1.66 | ????0.27 | ????0.27 | The same |
| Comparative example 2 | ????0.003 | ????1.58 | ????0.29 | ????0.21 | The same |
| Comparative example 3 | ????0.004 | ????1.59 | ????0.27 | ????0.23 | The same |
| Comparative example 4 | ????0.002 | ????1.59 | ????0.32 | ????0.30 | The same |
Table 2
Embodiment 1
The component of pressing in the table 1 is smelted, and obtains continuous casting steel billet by continuous casting; Continuously cast bloom heating then, roughing, roughing 4 passages, 25% → 25% → 40% → 45% draft/passage, the roughing finishing temperature is 988 ℃; Carry out finish rolling again, it is that 7 μ m rolls carry out finish rolling that finish rolling the 2nd passage adopts roughness, and the hot-rolled sheet after the finish rolling batches under 710 ℃ of temperature.Do not have to occur the corrugated defective of 〉=3 μ m height in the production board, magnetic is: B50=1.725T, P15/50=3.565W/kg.
Embodiment 2
The component of pressing in the table 1 is smelted, and obtains continuous casting steel billet by continuous casting; Continuously cast bloom heating then, roughing, roughing 4 passages, 25% → 30% → 40% → 40% draft/passage, the roughing finishing temperature is 992 ℃, it is that 7 μ m rolls carry out finish rolling that finish rolling the 2nd passage adopts roughness, 710 ℃ are batched, and do not have to occur the corrugated defective of 〉=3 μ m height in the production board, and magnetic is: B50=1.727T, P15/50=3.635W/kg.
Embodiment 3
The component of pressing in the table 1 is smelted, and obtains continuous casting steel billet by continuous casting; Continuously cast bloom heating then, roughing, roughing 4 passages, 25% → 30% → 40% → 40% draft/passage, the roughing finishing temperature is 1002 ℃, adopting roughness is that 7 μ m rolls carry out the 2nd passage finish rolling, 710 ℃ are batched, and do not have to occur the corrugated defective of 〉=3 μ m height in the production board, and magnetic is: B50=1.716T, P15/50=3.448W/kg.
Embodiment 4
The component of pressing in the table 1 is smelted, and obtains continuous casting steel billet by continuous casting; Continuously cast bloom heating then, roughing, roughing 4 passages, through 25% → 30% → 35% → 45% draft/passage, the roughing finishing temperature is 996 ℃, adopting roughness is that 7 μ m rolls carry out the 2nd passage finish rolling, 710 ℃ are batched, and do not have to occur the corrugated defective of 〉=3 μ m height in the production board, and magnetic is: B50=1.720T, P15/50=3.627W/kg.
Comparative example 1, roughing 6 passages, 11% → 18% → 19% → 26% → 31% → 34% draft/passage, the roughing finishing temperature is 951 ℃, and finish rolling adopts smooth roll to carry out finish rolling, and the hot-rolled sheet after the finish rolling batches at 550 ℃.Occur the corrugated ratio of defects 25% of 〉=3 μ m height in the production board, magnetic is: B50=1.694T, P15/50=4.015W/kg.
Comparative example 2, roughing 6 passages, through 11% → 18% → 19% → 26% → 31% → 34% draft/passage, the roughing finishing temperature is 955 ℃, adopt smooth roll to carry out finish rolling, 550 ℃ are batched, and occur the corrugated ratio of defects 17% of 〉=3 μ m height in the production board, and magnetic is: B50=1.697T, P15/50=4.108W/kg.
Comparative example 3, roughing 6 passages, through 11% → 18% → 19% → 26% → 31% → 34% draft/passage, the roughing finishing temperature is 948 ℃, finish rolling adopts smooth roll to carry out finish rolling, 550 ℃ are batched, and occur the corrugated ratio of defects 12% of 〉=3 μ m height in the production board, and magnetic is: B50=1.687T, P15/50=4.126W/kg.
Comparative example 4, roughing 6 passages, through 11% → 18% → 19% → 26% → 31% → 34% draft/passage, the roughing finishing temperature is 947 ℃, adopt smooth roll to carry out finish rolling, 550 ℃ are batched, and occur the corrugated ratio of defects 20% of 〉=3 μ m height in the production board, and magnetic is: B50=1.689T, P15/50=4.135W/kg.
The present invention can eliminate the corrugated defective fully, and can omit hot-rolled sheet normalizing operation after optimizing component and technology, reduces production costs; The non-oriented electromagnetic steel sheet physicals of making is improved.
Claims (11)
1. the non-oriented electromagnetic steel sheet that does not have the corrugated defective, its component is:
C：0.006％～0.01％，
0＜Si≤2.0％
0＜Al≤0.4％
Mn≤1.0％
All the other are Fe and inevitably are mingled with;
Below all represent with weight percent.
2. the non-oriented electromagnetic steel sheet of no corrugated defective as claimed in claim 1 is characterized in that, the preferable range of described C is 0.007%～0.009%.
3. the non-oriented electromagnetic steel sheet of no corrugated defective as claimed in claim 1 or 2 is characterized in that, the ratio of described Si/C is: 180～260.
4. do not have the manufacture method of the non-oriented electromagnetic steel sheet of corrugated defective, may further comprise the steps:
A, slab casting;
B, strand heating, roughing;
C, finish rolling;
D, batch.
5. the manufacture method of the non-oriented electromagnetic steel sheet of no corrugated defective as claimed in claim 4 is characterized in that, slab casting is preferably continuous casting process among the described step a.
6. the manufacture method of the non-oriented electromagnetic steel sheet of no corrugated defective as claimed in claim 4, it is characterized in that the roughing passage among the described step b≤4 passages, roughing accumulative total draft 〉=80%, draft 〉=40% that wherein has a passage at least, roughing finishing temperature 〉=980 ℃.
7. as the manufacture method of the non-oriented electromagnetic steel sheet of claim 4 or 6 described no corrugated defectives, it is characterized in that, preferably have draft 〉=40% of 2 above passages among the described step b in the roughing process.
8. as the manufacture method of the non-oriented electromagnetic steel sheet of claim 4 or 6 described no corrugated defectives, it is characterized in that preferred roughing finishing temperature in the described step b roughing process 〉=1000 ℃.
9. the manufacture method of the non-oriented electromagnetic steel sheet of no corrugated defective as claimed in claim 4, it is characterized in that, in the described step c finish rolling process, in the several frames in finish rolling tandem rolling unit front, have at least a frame to adopt the comparatively coarse roll of roll surface, roll surface roughness 〉=5 μ m.
10. as the manufacture method of the non-oriented electromagnetic steel sheet of claim 4 or 9 described no corrugated defectives, it is characterized in that preferred roll roll surface roughness 〉=7 μ m in the described step c finish rolling process.
11. the manufacture method of the non-oriented electromagnetic steel sheet of no corrugated defective as claimed in claim 4 is characterized in that, hot-rolled sheet in the described steps d 〉=710 ℃ high temperature batches.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03116890 CN1258610C (en) | 2003-05-12 | 2003-05-12 | Indirectional electric steel plate without corrugated fault and its making process |
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|---|---|---|---|
| CN 03116890 CN1258610C (en) | 2003-05-12 | 2003-05-12 | Indirectional electric steel plate without corrugated fault and its making process |
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|---|---|
| CN1548569A true CN1548569A (en) | 2004-11-24 |
| CN1258610C CN1258610C (en) | 2006-06-07 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100529115C (en) * | 2004-12-21 | 2009-08-19 | 株式会社Posco | Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same |
| CN101275198B (en) * | 2007-03-27 | 2010-09-29 | 宝山钢铁股份有限公司 | Manufacturing method of middle code non-oriented electrical steel with fine surface |
| CN101660035B (en) * | 2008-08-25 | 2012-02-01 | 鞍钢股份有限公司 | Method for manufacturing electrical steel with excellent longitudinal magnetic property |
| WO2012041053A1 (en) | 2010-09-30 | 2012-04-05 | 宝山钢铁股份有限公司 | Non-oriented electric steel plate without corrugated fault and production method thereof |
| CN103276175A (en) * | 2013-06-07 | 2013-09-04 | 鞍钢股份有限公司 | Hot rolling method for improving electromagnetic performance of silicon steel |
| CN104878288A (en) * | 2015-05-22 | 2015-09-02 | 本钢板材股份有限公司 | Method for controlling silicon steel corrugated defects |
| CN106282745A (en) * | 2015-06-26 | 2017-01-04 | 鞍钢股份有限公司 | Production method of non-oriented electrical steel |
| CN107164689A (en) * | 2017-04-19 | 2017-09-15 | 唐山钢铁集团有限责任公司 | It is a kind of to improve the method for grade electric steel row of tiles on a roof shape defect in sheet bar process production |
-
2003
- 2003-05-12 CN CN 03116890 patent/CN1258610C/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100529115C (en) * | 2004-12-21 | 2009-08-19 | 株式会社Posco | Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same |
| CN101275198B (en) * | 2007-03-27 | 2010-09-29 | 宝山钢铁股份有限公司 | Manufacturing method of middle code non-oriented electrical steel with fine surface |
| CN101660035B (en) * | 2008-08-25 | 2012-02-01 | 鞍钢股份有限公司 | Method for manufacturing electrical steel with excellent longitudinal magnetic property |
| WO2012041053A1 (en) | 2010-09-30 | 2012-04-05 | 宝山钢铁股份有限公司 | Non-oriented electric steel plate without corrugated fault and production method thereof |
| EP2623626A4 (en) * | 2010-09-30 | 2017-11-22 | Baoshan Iron & Steel Co., Ltd. | Non-oriented electric steel plate without corrugated fault and production method thereof |
| CN103276175A (en) * | 2013-06-07 | 2013-09-04 | 鞍钢股份有限公司 | Hot rolling method for improving electromagnetic performance of silicon steel |
| CN103276175B (en) * | 2013-06-07 | 2017-09-29 | 鞍钢股份有限公司 | Hot rolling method for improving electromagnetic performance of silicon steel |
| CN104878288A (en) * | 2015-05-22 | 2015-09-02 | 本钢板材股份有限公司 | Method for controlling silicon steel corrugated defects |
| CN106282745A (en) * | 2015-06-26 | 2017-01-04 | 鞍钢股份有限公司 | Production method of non-oriented electrical steel |
| CN107164689A (en) * | 2017-04-19 | 2017-09-15 | 唐山钢铁集团有限责任公司 | It is a kind of to improve the method for grade electric steel row of tiles on a roof shape defect in sheet bar process production |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1258610C (en) | 2006-06-07 |
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