CN104226954B - Precipitate and inclusion control method during twin-roll thin strip continuous casting non-orientation silicon steel - Google Patents
Precipitate and inclusion control method during twin-roll thin strip continuous casting non-orientation silicon steel Download PDFInfo
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Abstract
The invention belongs to metallurgical technology field, it is directed to twin-roll thin strip continuous casting and produces the problem that precipitate and field trash be there is no during non-orientation silicon steel suitable control method, propose precipitate and inclusion control method during a kind of twin-roll thin strip continuous casting non-orientation silicon steel.Method is, non-orientation silicon steel molten steel is solidified through dual-roller thin-band conticaster and shaped, Cast Strip thickness 2.0～2.6mm；Cast Strip enters secondary cooling zone after casting after going out roller time, by the slow cooling of slow cooling room；Enter back into three cold sections, rapid cooling immediately；By batching after the Cast Strip of three cold sections of rapid cooling cools down, obtain non-orientation silicon steel Cast Strip.With it, AlN precipitate in Cast Strip can be made to reach 0.5～2.0 μm ranks, and MnS separates out and is substantially suppressed, and essentially eliminating the two grows up on recrystal grain and the impact of magnetic domain wall moving, lays the foundation for exploitation high-quality non-orientation silicon steel.
Description
Technical field
The invention belongs to metallurgical technology field, relate to precipitate and folder during a kind of twin-roll thin strip continuous casting non-orientation silicon steel
Foreign material control method.
Background technology
Non-orientation silicon steel, also known as non-oriented electrical steel, as the core material of motor, is a kind of very important soft magnetism material
Material, it is desirable to reach the magnetic property index of low iron loss, high magnetic strength.Wherein precipitate with inclusion size, mark and distribution is
Affect a key factor of magnetism of material energy.These precipitates and field trash mainly include AlN and MnS, the shadow to magnetic property
Ring and mainly suppress growing up of final annealing process recrystal grain, make crystal grain be less than optimal critical dimension and make iron loss increase
Add；On the other hand it is then directly to make domain wall not easily shifted and pinning, hinders the magnetic history of iron-based body, make the magnetic induction of finished product
Intensity reduces.Therefore, generally the steel to be purified when steel-making, should make precipitated phase be roughened in follow-up manufacture process as far as possible.
Hot rolling, normalizing, final annealing temperature should prevent the back dissolving of precipitated phase less than the solid solubility temperature of MnS, AlN etc., but temperature are unsuitable
Too low, otherwise it is unfavorable for the roughening of precipitated phase.In typical half-technique non oriented silicon steel, MnS and AlN analysis in electrical sheet
Go out size when 50-100nm, recrystal grain is grown up impact the strongest.When precipitation particles more than 100nm then to crystal grain
Growing up almost without inhibitory action, the pinning impact of precipitation particles size neticdomain wall in more than 300nm is on electrical sheet is the most obvious
Weaken, the therefore precipitation of oversize or be mingled with magnetic property little in final electrical steel product, and ＜ 30nm's is ultra-fine little
Magnetic property is not the most affected by precipitate.
Twin-roll thin strip continuous casting produces the short process production technology that non-orientation silicon steel is a kind of energy-saving and environmental protection, and molten steel is at double rollers
Direct forming between the double rollers with cooling effect rotated on strip caster, cooling rate is up to 102～104DEG C/s, and Cast Strip is thick
Degree is general 1.0～5.0mm, the cold speed of cooling twice space-time > 40 DEG C/s, it is far longer than non-orientation silicon steel in tradition casting process
Strand shapes and cooling rate during cooling twice.Difference in these shapings and cooling makes the precipitate in Cast Strip and field trash have
Being clearly distinguishable from the feature of tradition strand, the compound precipitation of AlN and MnS is suppressed, and the two size difference is relatively big, needs to carry out pin
Control to property so that it is the impact on finished product magnetic property is preferably minimized.
The major measure controlling MnS in traditional process is to try to reduce the content of S element in steel, and such as Ca processes and REM
Process the sulfide floating obtaining high temperature liquation, also have the size etc. increasing Mn element roughening MnS precipitate, and control AlN's
Way mainly by adding Al formation high temperature precipitate, the precipitate of the most several μm levels or field trash, reduces recrystallization
The impact of crystal grain, or use the way reducing N element, such as add B element and form the thick precipitation of BN.These measures often pin
To smelting process, and the control in strip casting process does not has pertinent literature report.
And it practice, field trash is formed with precipitate and develops and occurs mainly in continuous casting and cooling procedure, the most how
Impact solidification and follow-up cooling behavior actually control to separate out or be mingled with the most effective method.But to traditional process or
For the thicker strand of CSP, due to continuous casting Parameter adjustable narrow range, big thickness strand influence factor is complicated and is difficult in continuous casting section
Realize the control to Second Phase Precipitation.Pertinent literature is not had to report for the control in strip casting process yet.
Summary of the invention
It is an object of the invention to be directed to twin-roll thin strip continuous casting produce during non-orientation silicon steel precipitate and be mingled with
Thing there is no the problem of suitable control method, proposes a kind of twin-roll thin strip continuous casting and produces precipitate and folder during non-orientation silicon steel
Foreign material control method.The method, based on the controlled principle of solidification temperature in Twin-roll Strip Continuous Casting and cooling rate, uses cast temperature
Degree and Cast Strip go out roller after secondary cooling zone soak and three cold sections of quick coolings control high temperature precipitate AlN and relatively low temperature respectively
The degree particle size of precipitate MnS, volume fraction and distribution, to eliminate precipitate and field trash to finished product magnetic property not
Profit impact and iron loss.This patent is at project of national nature science fund project (U1260204；51174059) complete under subsidizing.
Precipitate and inclusion control method during a kind of twin-roll thin strip continuous casting non-orientation silicon steel, comprise the following steps:
1, non-orientation silicon steel main chemical compositions is by weight percent: C: < 0.005%, Si:1.0～3.0%, Mn:
0.2～0.3%, Al:0.2～0.8%, O :≤0.004%, S :≤0.003%, N :≤0.004%, remaining is for Fe and can not keep away
The impurity exempted from；
2, pouring molten steel temperature is 1540～1620 DEG C, and molten steel enters the tundish being preheated to 1200 DEG C by cast gate, then
Poured in the molten bath being made up of the steel rider rotated and side seal board of dual-roller thin-band conticaster by tundish, molten steel and the crystallization of steel rider
Roll surface contact rapid solidification also shapes, and controls teeming speed 50～70m/min, goes out band temperature >=1380 DEG C, Cast Strip thickness 2.0～
2.6mm；
3, after entering casting after Cast Strip goes out roller, secondary cooling zone i.e. casting roll is exported to kink when pinching roll segment, by ambient temperature 800
～the slow cooling room of 900 DEG C, the slow cooling time 10～15s, it is cooled to temperature >=1270 DEG C；
4, when Cast Strip is entered three cold sections i.e. kink pinch roll to coiling machine section by secondary cooling zone, rapid cooling immediately, cooling rate >=50 DEG C/
S, is cooled to final cooling temperature≤800 DEG C；
5, the Cast Strip air cooling after three cold sections of rapid cooling is batched to 400～600 DEG C, to eliminate the quick cooling procedure in Cast Strip
Middle residual stress, obtains non-orientation silicon steel Cast Strip.
In the non-orientation silicon steel Cast Strip that this method obtains, AlN precipitate reaches 0.5～1.5 μm ranks, compound precipitation
Or the MnS individually separated out, and the size of second phase particles (AlN and MnS) and distribution are controlled.
Present invention have an advantage that
1, under the silicon steel composition of the present invention, by controlling AlN and MnS Precipitation Temperature, it is to avoid AlN and MnS and oxygen
The compound precipitation of compound.
2, thin strap continuous casting (can mainly include pouring temperature, the degree of superheat, Cast Strip thickness and roll by regulation and control casting parameter
Rotating speed etc.), change Cast Strip flexibly and go out the temperature of roll and treat temperature mode, and then affect second including including AlN and MnS etc.
The temperature range separated out mutually, it is achieved precipitate and field trash type, size, volume fraction and the flexible control of distribution.
3, by composition and technology controlling and process, AlN precipitate in Cast Strip is made to reach 0.5～1.5 μm ranks, compound precipitation
Or the MnS individually separated out, and make the size of second phase particles (AlN and MnS) and distribution obtain preferable control, substantially eliminate
Both, cold rolling after annealing recrystal grain is grown up and the pinning effect of magnetic domain wall moving, obtain good magnetic property, make thin
Band continuous casting process controls, outside tissue and texture, to add the control device to precipitate, is applied to casting silicon steel and produces more
Practicality.
4, whole control measure are online treatment, simplify production process.
5, remain suitable thick uniform tissue in Cast Strip, magnetic property is produced wholesome effect.
Accompanying drawing explanation
Fig. 1 present invention process schematic flow sheet；
Wherein: 1, tundish；2, molten bath；3, steel rider；4, slow cooling room；5, fast cooling device；6, coiling machine；
Fig. 2 AlN and MnS Equilibrium Precipitation phase diagrams；
The micro-organization chart of the Cast Strip of preparation in Fig. 3 example 1；
AlN precipitate pattern and energy spectrogram in the Cast Strip prepared in Fig. 4 example 1；
AlN precipitate different size respective frequencies and volume integral Butut in the Cast Strip prepared in Fig. 5 example 1；
MnS precipitate and energy spectrogram in the Cast Strip after annealing prepared in Fig. 6 example 1；
The micro-organization chart of the Cast Strip of preparation in Fig. 7 example 2；
AlN precipitate different size respective frequencies and volume integral Butut in the Cast Strip prepared in Fig. 8 example 2；
The micro-organization chart of the Cast Strip of preparation in Fig. 9 example 3；
AlN precipitate different size respective frequencies and volume integral Butut in the Cast Strip prepared in Figure 10 example 3.
Detailed description of the invention
Embodiment 1
The chemical composition of experiment steel A is shown in Table 1, and pouring molten steel temperature 1620 DEG C is poured into by the tundish being preheated to 1200 DEG C
In the molten bath being made up of the steel rider rotated and side seal board of dual-roller thin-band conticaster, teeming speed 50m/min, go out band temperature 1422 ± 2
DEG C, Cast Strip thickness 2.2～2.5mm；Cast Strip enters secondary cooling zone, by the slow cooling room that temperature is 800～850 DEG C, through slow cooling 15s,
Slow cooling section final temperature 1310～1320 DEG C；Cast Strip high temperature slow cooling immediately enters three cold sections and carries out rapid cooling after terminating, and cooling rate 70 DEG C/
S, final cooling temperature 800 DEG C；Cast Strip air cooling after rapid cooling is batched to 400 DEG C.
Casting-rolling technology principle is shown in that Fig. 1, Fig. 2 are AlN and MnS Equilibrium Precipitation phase diagrams, and Cast Strip microscopic structure is shown in Fig. 3, casting
In band, AlN is individually to separate out, and separates out typical case's pattern as shown in Figure 4, reaches 0.8 μm rank, and the N of solid solution in Cast Strip separates out ratio about
20%, AlN particle separates out size and volume distributed median such as Fig. 5.Additionally Cast Strip almost without compound precipitation or individually separates out
MnS, in final annealing state tissue, (annealing temperature 850 ± 5 DEG C, anneal 5min) finds that < precipitate of 20nm, such as Fig. 6, quantity
Seldom, within accounting for the 2% of total amount, illustrate that in Cast Strip, MnS is significantly suppressed, if S content can reduce further, it will make
MnS is suppressed further.
Table 1 embodiment 1 is tested chemical composition (wt%) and the Cast Strip thickness (mm) of steel
Embodiment 2
The chemical composition of experiment steel B is shown in Table 2, and pouring molten steel temperature 1580 DEG C is poured into by the tundish being preheated to 1200 DEG C
In the molten bath being made up of the steel rider rotated and side seal board of dual-roller thin-band conticaster, teeming speed 60m/min, go out band temperature 1380 DEG C,
Cast Strip thickness 2.2～2.6mm；Cast Strip enters secondary cooling zone, by the slow cooling room that temperature is 850～900 DEG C, through slow cooling 10s, slow cooling
Section final temperature 1270～1290 DEG C；Cast Strip high temperature slow cooling enters three cold sections and carries out rapid cooling, 60 DEG C/s of cooling rate, eventually cold temperature after terminating
Spend 780 DEG C；Cast Strip air cooling after rapid cooling is batched to 500 DEG C.
Cast Strip tissue as it is shown in fig. 7, in Cast Strip AlN be individually to separate out, reach 1.2 μm ranks, the N of solid solution in Cast Strip separates out
Ratio about 22%, AlN particle separates out size and volume distributed median such as Fig. 8.Cast Strip does not finds compound separate out or individually separate out
MnS。
Table 2 embodiment 2 is tested chemical composition (wt%) and the Cast Strip thickness (mm) of steel B
Embodiment 3
The chemical composition of experiment steel C is shown in Table 3, pouring temperature about 1540 DEG C, the tundish being preheated to 1200 DEG C pour into double
In the molten bath being made up of the steel rider rotated and side seal board of roll thin-belt continuous casting machine, teeming speed 70m/min, go out band temperature 1385 DEG C, casting
Tape thickness 2.0～2.4mm；Cast Strip enters secondary cooling zone, by the slow cooling room that temperature is 850～900 DEG C, through slow cooling 12s, slow cooling section
Final temperature 1270～1280 DEG C；Cast Strip high temperature slow cooling enters three cold sections after terminating and carries out rapid cooling, 50 DEG C/s of cooling rate, final cooling temperature
750℃；Cast Strip air cooling after rapid cooling is batched to 600 DEG C.
Cast Strip tissue as it is shown in figure 9, in Cast Strip AlN be individually to separate out, reach 2.0 μm ranks, the N of solid solution in Cast Strip separates out
Ratio about 26%, AlN particle separates out size and volume distributed median such as Figure 10.Cast Strip does not finds compound separate out or individually separate out
MnS。
Table 3 embodiment 3 is tested chemical composition and the Cast Strip thickness (mm) of steel C
Claims (3)
1. precipitate and inclusion control method during a twin-roll thin strip continuous casting non-orientation silicon steel, it is characterised in that include
Following steps:
(1) non-orientation silicon steel is smelted for molten steel, by molten steel in tundish pours into the molten bath of dual-roller thin-band conticaster, molten bath by
The steel rider rotated and side seal board composition, molten steel and steel rider crystallize roll surface and contact rapid solidification and shape, Cast Strip thickness 2.0～
2.6mm；
Described non-orientation silicon steel main chemical compositions is by weight percent: C:＜ 0.005%, Si:1.0～3.0%, Mn:0.2
～0.3%, Al:0.2～0.8%, O :≤0.004%, S :≤0.003%, N :≤0.004%, remaining is that Fe is with inevitable
Impurity；
(2) after Cast Strip goes out roller enter casting after secondary cooling zone time, by slow cooling room, slow cooling time 10～15s, be cooled to Cast Strip temperature >=
1270℃；
(3) Cast Strip enters three cold sections through secondary cooling zone, rapid cooling immediately, and cooling rate >=50 DEG C/s is cooled to final cooling temperature≤800 DEG C；
(4) by batching after the Cast Strip of three cold sections of rapid cooling cools down, non-orientation silicon steel Cast Strip is obtained；
Wherein, in described step (1), tundish is preheated to 1200 DEG C；
In described step (1), control teeming speed 50～70m/min, go out band temperature >=1380 DEG C；
In described step (4), batch after Cast Strip air cooling to 400～600 DEG C.
Precipitate and Control and Inclusion Removal side during a kind of twin-roll thin strip continuous casting non-orientation silicon steel the most according to claim 1
Method, it is characterised in that in described step (1), pouring molten steel temperature is 1540～1620 DEG C.
Precipitate and Control and Inclusion Removal side during a kind of twin-roll thin strip continuous casting non-orientation silicon steel the most according to claim 1
Method, it is characterised in that in described step (2), the ambient temperature of slow cooling room is 800～900 DEG C.
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| JPH0631395A (en) * | 1992-07-16 | 1994-02-08 | Nippon Steel Corp | Production of thin cast slab for non-oriented silicon steel sheet |
| JPH09201654A (en) * | 1996-01-26 | 1997-08-05 | Nippon Steel Corp | Thin sheet continuous casting method |
| JP2002356718A (en) * | 2001-05-28 | 2002-12-13 | Nippon Steel Corp | Method for producing nonoriented silicon steel sheet having excellent core loss and brittleness characteristic |
| CN102041449A (en) * | 2011-01-16 | 2011-05-04 | 首钢总公司 | Method for improving electromagnetic performance of oriented electric steel by low-temperature plate blank heating process |
| CN102041367A (en) * | 2009-10-23 | 2011-05-04 | 宝山钢铁股份有限公司 | Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel |
| CN102274936A (en) * | 2011-08-03 | 2011-12-14 | 东北大学 | Method for manufacturing non-oriented silicon steel plate based on twin-roll thin strip continuous casting technology |
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2014
- 2014-08-25 CN CN201410421140.6A patent/CN104226954B/en active Active
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| JPH0631395A (en) * | 1992-07-16 | 1994-02-08 | Nippon Steel Corp | Production of thin cast slab for non-oriented silicon steel sheet |
| JPH09201654A (en) * | 1996-01-26 | 1997-08-05 | Nippon Steel Corp | Thin sheet continuous casting method |
| JP2002356718A (en) * | 2001-05-28 | 2002-12-13 | Nippon Steel Corp | Method for producing nonoriented silicon steel sheet having excellent core loss and brittleness characteristic |
| CN102041367A (en) * | 2009-10-23 | 2011-05-04 | 宝山钢铁股份有限公司 | Manufacturing method of thin strip continuously cast and cold rolled non-oriented electrical steel |
| CN102041449A (en) * | 2011-01-16 | 2011-05-04 | 首钢总公司 | Method for improving electromagnetic performance of oriented electric steel by low-temperature plate blank heating process |
| CN102274936A (en) * | 2011-08-03 | 2011-12-14 | 东北大学 | Method for manufacturing non-oriented silicon steel plate based on twin-roll thin strip continuous casting technology |
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| 双辊连铸法制取3.0%Si硅钢薄带的组织与性能;杨春楣等;《重庆大学学报(自然科学版)》;20020228;第25卷(第02期);56-58 * |
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Application publication date: 20141224 Assignee: Hebei dedicated Steel Co., Ltd. Assignor: Northeastern University Contract record no.: 2016210000030 Denomination of invention: Method for controlling precipitates and impurities in twin-roll thin-strip casting process of non-oriented silicon steel License type: Exclusive License Record date: 20160923 |
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