CN1931476A - Method of applying electric field energy on molten steel to improve quality of silicon steel billet - Google Patents
Method of applying electric field energy on molten steel to improve quality of silicon steel billet Download PDFInfo
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- CN1931476A CN1931476A CN 200510047210 CN200510047210A CN1931476A CN 1931476 A CN1931476 A CN 1931476A CN 200510047210 CN200510047210 CN 200510047210 CN 200510047210 A CN200510047210 A CN 200510047210A CN 1931476 A CN1931476 A CN 1931476A
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Abstract
The method of applying electric field energy on molten steel to improve quality of silicon steel billet is to introduce electric field energy with the electric field energy generator and the electrodes into molten steel, the electric field energy waveform is duty ratio variable square wave of energy 1000 J-180 MJ, voltage 100-1800V, current 100A-8KA, frequency not higher than 25 Hz and duty ratio of 5-90 %. The electric field energy generator is suitable for use in industrial production and controllable in electric field energy parameters. The treated molten steel results in refined billet structure with obviously increased global crystal, less defaults and high quality.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, relate in particular to improving the method that silicon steel slab quality liquid towards molten steel applies electric field energy.
Background technology
Because the composition of silicon steel is more special, the silicon content height, the coarse-grain structure and the dendritic crystalline substance of its continuous casting billet solidified structure are very flourishing, and the quantity of center globular crystal seldom, even almost do not have, therefore when rolling silicon steel plate, be easy to occur mass defect, particularly corrugated flatness defect.For addressing the aforementioned drawbacks common employing electromagnetic agitation and gently depressing technology.What occur in recent years is under the condition of complete liquid state at metal, it is applied electric field energy change the liquid metal structure, the technology of thinning metal solidification texture also can be used to address the aforementioned drawbacks, can be owing to this technology also be in the experimental study stage basically, and do the test of some low-temperature alloys mostly in the laboratory.Some breadboard experimental facilities energy are too little, are not suitable for the abominable industrial production of site environment, and some parameter maybe can not be surveyed or uncontrollable in the parameters such as voltage, electric current, frequency.Some experimental facilities has only been considered the parameter of voltage and frequency, and does not consider that electric current and dutycycle are to being discharged into the effect of energy in the molten steel.Some experimental facilities adopts the frequency of hundreds if not thousands of hertz, does not consider the influence of dutycycle to releasing energy, and like this, is applied in the big industrial production, will become very faint because of kelvin effect makes treatment effect.Some experimental facilities directly affact the electric energy in the electric power system in the molten metal of feather weight in the laboratory, as are applied directly in the industrial production, then can make the electric power system of factory trip and can't work.Because experimental facilities does not have enough big energy storage releasing device,, in industrial production, can't obtain desirable treatment effect though can satisfy the demand that several kilograms of molten metals are handled in the laboratory.In addition, the different effects that influence the molten steel processing equally of electric field energy waveform, inappropriate waveform has considerable influence to the energy that outputs in the molten steel, and some waveform voltage is very high, but the energy that is transferred in the molten steel is very little, does not have the effect of processing in industrial production.At present, for being applicable to big suitability for industrialized production, especially the silicon steel continuous casting billet being applied electric field energy with liquid molten steel and improve the technology of its quality and also do not have successful experience, so suitable electric field energy processing parameter can't be provided.
Summary of the invention
The object of the present invention is to provide a kind of big suitability for industrialized production that can be applicable to, adopt the variable duty cycle square wave that molten steel applied the method that electric field energy is improved the silicon steel slab quality.
The present invention applies electric field energy to molten steel and improves the method for silicon steel slab quality and be achieved in that by the electric field energy generating means and by electrode electric field energy imported molten steel, the waveform that it is characterized in that described electric field energy is the variable duty cycle square wave, the energy that is applied is 1000J～180MJ, voltage 100V～1800V, electric current 100A～8KA, frequency≤25Hz, dutycycle 5%～90%.
The present invention adjusts the required electric field energy that applies according to parameters such as different steel grades and molten steel amounts by the electric field energy generating means, has obtained gratifying processing parameter.
The present invention is specially adapted to handle the molten steel in continuous casting tundish or the crystallizer.This method is simple to operate, and is easy to use.
Described electric field energy was 1000J～170MJ when the present invention handled the silicon steel molten steel in 5 tons～80 tons tundish, voltage 100V～1700V, electric current 100A～8KA, frequency≤25Hz, dutycycle 5%～90%.
The present invention has used the electric field energy generating means that is suitable for big suitability for industrialized production, a kind of more precisely electric field energy generation releasing device.This device mainly stores release portion by power unit, electric field energy and the control part branch is formed.Wherein: electric field energy stores release portion and comprises electric field energy storage element, electric field energy releasing unit and energy pre-storage unit; Control section comprises that electric field energy discharges control module and a PLC.Energy pre-storage unit and electric field energy storage element carry out the storage and the release of energy under the control of PLC and electric field energy release control module, the energy and the energy pre-storage unit energy stored of power supply are sent into the electric field energy storage element, and through electrode electric field energy is imported molten steel by the electric field energy storage element, molten steel is handled.Its power unit comprises three phase mains transformer, three-phase full-controlled bridge rectification unit, high pressure fully controlled bridge rectification unit and filter unit composition.Filtered dc source superposes under the control of energy stack switch unit or switches, and the dc source after stack or the switching is to energy pre-storage unit and electric field energy storage element charging storage power.PLC collection setup parameter and real time scan power unit, electric field energy store voltage, electric current, frequency, the duty cycle parameters of release portion, discharge by the energy that real-time data are handled, numerical computations outputs to electric field energy release control module control electric field energy releasing unit, detect and coordinate to control power supply, energy stack switch unit, energy pre-storage unit, electric field energy storage element simultaneously, electric field energy is outputed in the processed molten steel by the parameter of handling molten steel.According to industrial actual conditions, but manual adjustments outputs to the energy in the molten steel, but also automatic optimal makes the energy that affacts in the molten steel reach maximum.
The variable duty cycle square wave that the present invention adopts is that a kind of output energy can be regulated control, action time and action period can be regulated the composite wave-shape of control, adopt the following energy output of frequency 25Hz can avoid kelvin effect, can between energy storage system and load, obtain bigger coupling energy, energy is input in the molten steel continuously.
Liquid molten steel after the present invention handles, refinement solidified structure, the coarse-grain solidified structure and the dendritic crystalline substance of silicon steel continuous casting billet have been reduced, and it is attenuated shorten, the globular crystal quantity at silicon steel continuous casting billet center is obviously increased, thereby the corrugated flatness defect that has occurred when having eliminated rolling silicon steel plate has effectively also reduced simultaneously defectives such as gross segregation, loose, crackle, shrinkage cavity, and the quality of silicon steel continuous casting billet and silicon steel mill bar quality are greatly improved.
Description of drawings
Fig. 1 a is the directional silicon steel slab solidified structure low power figure that handles without electric field energy.
Fig. 1 b is the directional silicon steel slab solidified structure low power figure after electric field energy is handled.
Fig. 2 a is the non-orientation silicon steel slab solidified structure low power figure that handles without electric field energy.
Fig. 2 b is the non-orientation silicon steel slab solidified structure low power figure after electric field energy is handled.
The specific embodiment
The invention will be further described by embodiment with reference to the accompanying drawings.
The embodiment of the invention has carried out applying the processing of electric field energy respectively to the liquid silicon steel molten steel of different steel grades in 5 tons～80 tons tundish, in watering the whole process of production of steel, by aluminium carbonaceous combination electrode electric field energy is imported molten steel by the electric field energy generating means, described electrode inserts molten steel by middle clad, and the degree of depth of insertion is at 200mm～1500mm.The waveform of described electric field energy is the variable duty cycle square wave, and the electric field energy that is applied is 1000J～170MJ, voltage 100V～1700V, electric current 100A～8KA, frequency≤25Hz, dutycycle 5%～90%.
The electric field energy that is applied during the liquid silicon steel molten steel of the present invention's different steel grades in handling 5 tons of tundish is 1000J～6000J, voltage 100V～500V, electric current 100A～800A, frequency≤25Hz, dutycycle 20%～50%.
The electric field energy that is applied during the liquid silicon steel molten steel of the present invention's different steel grades in handling 80 tons of tundish is 100MJ～170MJ, voltage 1000V～1700V, electric current 5KA～8KA, frequency≤25Hz, dutycycle 50%～90%.
The present invention applies electric field energy to the liquid orientation silicon steel molten steel in the sheet billet continuous casting tundish of 230mm * 1200mm and handles.This steel grade is AQ100, the composition of molten steel is (percentage by weight) C:0.03%～0.06%, Si:2.8%～3.3%, Mn:0.05%～0.20%, P:0.005%～0.100%, S:0.005%～0.025%, the capacity of tundish is 55 tons, the electric field energy that is applied is 125MJ, voltage 1600V, electric current 5KA, frequency 18Hz, dutycycle 83%.Fig. 1 a is the AQ100 directional silicon steel slab solidified structure low power figure that handles without electric field energy, and Fig. 1 b is the AQ100 directional silicon steel slab solidified structure low power figure after electric field energy is handled.By the comparison of Fig. 1 a and Fig. 1 b, the open grain structure of the slab solidified structure of handling without electric field energy is thick as can be seen, and the centre has only a spot of globular crystal.After electric field energy was handled, the refinement of slab solidified structure was very obvious, underbead crack, segregation and loose elimination substantially, and globular crystal is increased to about 70%.
The present invention applies electric field energy to the liquid non-orientation silicon steel molten steel in the sheet billet continuous casting tundish of 230mm * 1200mm and handles.This steel grade is 50AW540, the composition of molten steel is (percentage by weight) C≤0.005%, Si:1.4%～1.7%, Mn:0.10%～0.30%, P≤0.030%, S≤0.008%, the capacity of tundish is 55 tons, the electric field energy that is applied is 120MJ, voltage 1500V, electric current 5KA, frequency 16Hz, dutycycle 80%.Fig. 2 a is the 50AW540 non-orientation silicon steel slab solidified structure low power figure that handles without electric field energy, and Fig. 2 b is the 50AW540 non-orientation silicon steel slab solidified structure low power figure after electric field energy is handled.By the comparison of Fig. 2 a and Fig. 2 b, the globular crystal rate of handling without electric field energy is about 5.9% as can be seen, and dendritic brilliant width or diameter are on average at 6.90mm, and the length of dendritic crystalline substance is on average at 9.25mm.Globular crystal rate after electric field energy is handled reaches 32.4%, than improving 5.49 times before being untreated; Dendritic brilliant width or diameter average out to 4.33mm are than 1.59 times of refinements before being untreated; The length average out to 4.03mm of dendritic crystalline substance is than shortening 2.29 times before being untreated.
Claims (7)
1. one kind applies the method that electric field energy is improved the silicon steel slab quality to molten steel, by electrode electric field energy is imported molten steel by the electric field energy generating means, the waveform that it is characterized in that described electric field energy is the variable duty cycle square wave, the electric field energy that is applied is 1000J～180MJ, voltage 100V～1800V, electric current 100A～8KA, frequency≤25Hz, dutycycle 5%～90%.
2. according to claim 1 molten steel is applied the method that electric field energy is improved the silicon steel slab quality, it is characterized in that this method is applicable to the molten steel in continuous casting tundish or the crystallizer.
3. according to claim 1 and 2 molten steel is applied the method that electric field energy is improved the silicon steel slab quality, described electric field energy is 1000J～170MJ when it is characterized in that handling the silicon steel molten steel in 5 tons～80 tons tundish, voltage 100V～1700V, electric current 100A～8KA, frequency≤25Hz, dutycycle 5%～90%.
4. according to claim 3 molten steel is applied the method that electric field energy is improved the silicon steel slab quality, the electric field energy that is applied when it is characterized in that in 5 tons of tundish handling liquid silicon steel molten steel is 1000J～6000J, voltage 100V～500V, electric current 100A～800A, frequency≤25Hz, dutycycle 20%～50%.
5. according to claim 3 molten steel is applied the method that electric field energy is improved the silicon steel slab quality, the electric field energy that is applied when it is characterized in that in 80 tons of tundish handling liquid silicon steel molten steel is 100MJ～170MJ, voltage 1000V～1700V, electric current 5KA～8KA, frequency≤25Hz, dutycycle 50%～90%.
6. according to claim 3 molten steel is applied the method that electric field energy is improved the silicon steel slab quality, the electric field energy that is applied when it is characterized in that handling the liquid orientation silicon steel molten steel of 230mm * 1200mm slab in 55 tons of tundish is 125MJ, voltage 1600V, electric current 5KA, frequency 18Hz, dutycycle 83%.
7. according to claim 3 molten steel is applied the method that electric field energy is improved the silicon steel slab quality, the electric field energy that is applied when it is characterized in that handling the liquid non-orientation silicon steel molten steel of 230mm * 1200mm slab in 55 tons of tundish is 120MJ, voltage 1500V, electric current 5KA, frequency 16Hz, dutycycle 80%.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463447B (en) * | 2007-12-18 | 2010-12-08 | 鞍钢股份有限公司 | Method for producing oriented silicon steel by heating low temperature casting blank |
| CN104668526A (en) * | 2015-03-12 | 2015-06-03 | 东北大学 | Method for improving steel ingot casting quality |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1560315A (en) * | 2004-03-10 | 2005-01-05 | 上海大学 | Method for fining purified metal aluminium solidifying tissue |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101463447B (en) * | 2007-12-18 | 2010-12-08 | 鞍钢股份有限公司 | Method for producing oriented silicon steel by heating low temperature casting blank |
| CN104668526A (en) * | 2015-03-12 | 2015-06-03 | 东北大学 | Method for improving steel ingot casting quality |
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