CN100493770C - Method for conticaster controlling solidification structure of casting block - Google Patents
Method for conticaster controlling solidification structure of casting block Download PDFInfo
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- CN100493770C CN100493770C CNB2005100390304A CN200510039030A CN100493770C CN 100493770 C CN100493770 C CN 100493770C CN B2005100390304 A CNB2005100390304 A CN B2005100390304A CN 200510039030 A CN200510039030 A CN 200510039030A CN 100493770 C CN100493770 C CN 100493770C
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Abstract
A method for the conticaster to control the solidified structure of cast blank includes providing a HF pulse power supply with positive and negative electrodes, inserting its negative electrode into the molten steel in the crystallizer or tundish of conticaster, electrically connecting its positive eletrode with the steel base of conticaster, and conticasting while regulating the voltages, current and frequency to improve the performance of cast blank.
Description
Technical field:
The invention belongs to metallurgical industry continuous casting steel machine production technical field, be specifically related to a kind of conticaster control casting blank solidification structure that is used for, make its grain refinement, equiax crystal than the method that improves and reduce crackle.
Background technology:
Steel product quality has certain relation with the smelting process of steel, the process of setting of molten steel plays significant effects to the quality of steel, being mingled with in the steel, crackle, segregation, defective such as loose all form in process of setting, for producing the high-quality strand, must realize effectively control to process of setting, with suppress the growth of strand column crystal, promote equiax crystal growth, crystal grain thinning, minimizing component segregation, avoid central pipe and loose.
From the prior art, the basic means that the continuous casting steel process of setting is controlled has two kinds, and the one, the cooling velocity of control process of setting, this is the simplest method that obtains the fine grain continuous casting billet structure, uses also the widest; The 2nd, strengthen convection current, promote dendritic arm to fracture and reach the purpose of crystal grain thinning with remelting that its method has mechanical agitation, various vibration, electromagnetic agitation.What present industrial application was more is to adopt electromagnetic agitation, but electromagnetic agitation not only energy consumption is big, also can produce the white band in the casting blank solidification tissue, component segregation also the ring-type segregation can occur sometimes, and electromagnetic agitation also has a kind of limitation, can only in local one section very little zone, stir molten steel, can not the whole liquid core of continuous casting billet be stirred, be difficult to solve the central pipe and the center porosity of strand, the equipment investment of electromagnetic agitation is also very big in addition.
Summary of the invention:
The present invention is directed to continuous casting of molten steel technology and be difficult to control the molten steel solidification tissue, the technology shortcoming that existing electromagnetic agitating technology costs an arm and a leg, system complex, operating cost are high, invented a kind of method that is used for conticaster control casting blank solidification structure, this method utilizes the solidified structure of high-frequency electric field control strand to improve the quality of continuous casting billet.
Method of the present invention is: in the molten steel of the crystallizer of conticaster or tundish, add a high-frequency impulse electric field, high-frequency electric field produces with a high frequency electric source, an electrode inserts in the molten steel of molten bath, be connected to the negative pole of high frequency electric source output by cable, the positive pole of high frequency pulse power supply is connected on the steel construction basis of conticaster with cable, constitute a loop, when conticaster was normally cast, the high frequency pulse power supply that closes was with the output voltage of high frequency pulse power supply, electric current, frequency transfers to certain value, the high-frequency impulse electric field begins the solidified structure of continuous casting billet is handled, conticaster is turned off high frequency pulse power supply before stopping casting, and electrode is taken out.
In this method, the position of electrode size and insertion and insertion depth are decided according to the conticaster type.Billet caster the hole of electrode from middle clad, inserts in the molten steel of tundish, and electrode size is selected diameter 30～300mm, and long 100～2000mm, electrode insert the molten steel degree of depth 50～1000mm.Big section conticasters such as slab, bloom, circle base and special-shaped base, electrode inserts in the interior molten steel of crystallizer, and each crystallizer inserts an electrode, and electrode size is selected diameter 10～50mm, and long 10～500mm, electrode insert the molten steel degree of depth 0～500mm.Inserting the electrode material of molten steel, can be zirconium carbonaceous, aluminium carbonaceous, magnesium carbonaceous, cermet matter.The parameter range of choice of high-frequency impulse electric field: voltage 0～60V, electric current 1～2000A, frequency 0.1～60KHz.Continuous casting billet is added that the mode of high-frequency electric field is that an electrode inserts molten steel, and a cable loop is connected on the basic steel construction of conticaster.
The invention has the advantages that:
1. adopt the slab quality after this method is handled good.The strand grain refinement, the equiax crystal district enlarges and can eliminate central pipe above more than 50%, eliminates the rimhole of strand, reduces underbead crack significantly.This method not only can be used for improving continuous casting billet structure and architecture quality, and can be used for adsorbing field trash in the molten steel, smelts ultra-clean steel.
2., device is simple, easy to maintenance.The main equipment that the present invention adopts is simple, is made up of an electrode and a high frequency electric source, to the not influence of ordinary production of continuous casting, only needs to insert an electrode and get final product in molten steel in the operating process.
3, with low cost.Whole table apparatus only is made up of electrode, high frequency electric source and observing and controlling display device three parts; All devices, components and parts be domestic all manufacturing firm.
4, operating cost is low.The material of running stores electrode is common, long service life, and an electrode can use more than 100 hours; Device does not have special construction and parts, does not need special care and maintenance.The operating cost key reaction is on consumption of electrode and power consumption.
Description of drawings:
Fig. 1: a kind of device schematic diagram that is used for the method for conticaster control casting blank solidification structure
Among the figure: 1: molten steel, 2: electrode 3:. cable 4: high frequency pulse power supply output negative pole 5: high frequency pulse power supply 6: computer data acquisition system 7: display 8.: operation switch board 9.: high frequency pulse power supply input 10: high frequency pulse power supply output cathode
The specific embodiment:
For the device schematic diagram of realizing the inventive method is seen shown in the accompanying drawing 1, this device is made up of molten bath molten steel 1, electrode 2, cable 3, operation switch board 8, high frequency pulse power supply 5, power supply output negative pole 4, power supply output cathode 10, the input 9 of power supply, the computer acquisition system 6 of high frequency pulse power supply operating parameter, computer display 7.One end of electrode 2 inserts molten steel molten bath 1, the other end is connected on the output negative pole 4 of the high frequency pulse power supply 5 in the operation switch board 8 with cable 3, high frequency pulse power supply output cathode 10 usefulness cables are connected on the steel construction basis of conticaster, the input 9 of high frequency pulse power supply, power supply output negative pole 4 and 10 outputs of power supply output cathode are wired to computer data acquisition system 6, and relevant operating parameter shows on display 7.
Embodiment 1:
When certain steel mill's 5 stream billet caster is normally cast, in first-class strand flame cut place, get the 500mm continuous casting billet and carry out the low power comparative analysis before the test.Insert the cermet electrodes of diameter 10mm then in first-class 150 * 150mm crystallizer of casting machine, the degree of depth that electrode inserts molten steel is 100mm; The positive pole of high frequency pulse power supply is connected on straightening machine race bearing with cable and puts (ground connection).On two electrodes, feed 8V high-frequency impulse electric field, high-frequency electrical pulses flow valuve 180A.Conticaster casting speed 2.1m/min, casting steel grade low-alloy steel, 1520 ℃ of basket pouring temperature.In first-class flame cut place, get the 500mm continuous casting billet and carry out the low power analysis after 30 minutes.High-frequency impulse electric field treatment effect sees Table 1.
Embodiment 2:
When the billet caster ordinary production flow in certain steel mill six, in first-class strand flame cut place, get the 500mm continuous casting billet and carry out the low power comparative analysis before the high-frequency impulse electric field is handled.In the tundish of casting machine, insert diameter 100mm then, the aluminium carbonaceous electrodes of long 1500mm, the degree of depth that electrode inserts molten steel is 700mm; The positive pole of high frequency pulse power supply is connected on (ground connection) on the conticaster basis with cable.On two electrodes, feed 12V high-frequency impulse electric field, high-frequency electrical pulses flow valuve 480A.Conticaster casting speed 2.2m/min, casting steel grade 20MnSi, 1530 ℃ of basket pouring temperature.In first-class flame cut place, get the 500mm continuous casting billet and carry out the low power analysis after 30 minutes.High-frequency impulse electric field treatment effect sees Table 1.
The low power analysis of two kinds of implementation results all shows: there is tangible central pipe in the casting blank solidification tissue that does not add pulse current, casting blank solidification tissue through the pulse current processing, eliminated central pipe and rimhole fully, various crackles also obviously alleviate, and the center equiax crystal increases.
Table 1 high-frequency pulse current result of implementation
The assay method of data such as the crackle on the continuous casting billet adopts former metallurgical ministry standard, i.e. smelting mark YB/T2011.For example the data determination of " crackle " is length and the quantity according to the continuous casting billet crackle, looks into the crackle data that corresponding collection of illustrative plates draws continuous casting billet.
Claims (3)
1, a kind of method that is used for conticaster control casting blank solidification structure, it is characterized in that: in the molten steel of the crystallizer of conticaster or tundish, insert an electrode, this electrode is connected to the negative pole of high frequency electric source output by cable, the positive pole of high frequency pulse power supply is connected on the steel construction basis of conticaster with cable, when conticaster is normally cast, high frequency pulse power supply closes, output voltage, electric current, the frequency of high frequency pulse power supply are transferred to certain value, and the high-frequency impulse electric field begins the solidified structure of continuous casting billet is handled.
2, a kind of method that is used for casting process control molten steel solidification tissue according to claim 1 is characterized in that the output voltage 8～12V of high frequency pulse power supply, electric current 180～480A.
3, a kind of method that is used for casting process control molten steel solidification tissue according to claim 1, it is characterized in that: the electrode material can be zirconium carbonaceous or aluminium carbonaceous or magnesium carbonaceous or cermet matter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100390304A CN100493770C (en) | 2005-04-25 | 2005-04-25 | Method for conticaster controlling solidification structure of casting block |
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| CNB2005100390304A CN100493770C (en) | 2005-04-25 | 2005-04-25 | Method for conticaster controlling solidification structure of casting block |
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| CN100493770C true CN100493770C (en) | 2009-06-03 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850406B (en) * | 2010-06-30 | 2012-02-08 | 西安建筑科技大学 | Graphite electrode for applying pulse current to continuously casting tundish |
| CN102000792B (en) * | 2010-11-11 | 2012-05-30 | 武汉钢铁(集团)公司 | Casting method for increasing grain size of continuous casting blank |
| CN102839277B (en) * | 2012-09-21 | 2013-09-04 | 安徽工业大学 | Method for improving low-carbon aluminum killed steel blank hot cracks by adopting low-voltage pulse current |
| CN104001881B (en) * | 2014-06-23 | 2016-04-13 | 安徽工业大学 | A kind of stainless steel production method based on ultrasonic wave oscillation mould |
| CN104057040B (en) * | 2014-06-23 | 2016-03-16 | 安徽工业大学 | A kind of pinion steel horizontal casting applies the devices and methods therefor of ultrasonic wave vibration |
| CN104668526B (en) * | 2015-03-12 | 2017-08-08 | 东北大学 | Improve the method for steel ingot ingot quality |
| CN106141126A (en) * | 2015-03-25 | 2016-11-23 | 宝山钢铁股份有限公司 | Improve the device and method of continuous casting billet solidified structure |
| CN107790650B (en) * | 2016-09-06 | 2019-03-26 | 鞍钢股份有限公司 | A kind of micro alloyed steel directly fills the control method for rolling plate crackle |
| CN108411120A (en) * | 2018-04-04 | 2018-08-17 | 马鞍山华盛冶金科技发展有限公司 | A method of improving electroslag remelting steel ingot Solidification Quality |
| CN108251655A (en) * | 2018-04-04 | 2018-07-06 | 马鞍山华盛冶金科技发展有限公司 | A kind of smelting apparatus for improving electroslag remelting steel ingot Solidification Quality |
| CN117548636A (en) * | 2024-01-11 | 2024-02-13 | 中北大学 | Method for treating metal liquid by electric pulse in continuous solidification process |
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Assignee: Ma'anshan Runtong Metallurgical Material Co., Ltd. Assignor: Anhui University of Technology Contract record no.: 2011340000244 Denomination of invention: Method in use for conticaster for controlling solidification structure of casting block Granted publication date: 20090603 License type: Exclusive License Open date: 20051116 Record date: 20110804 |
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