CN102211161B - Method and device for improving quality of continuous casting large-caliber hollow metal tube blank - Google Patents
Method and device for improving quality of continuous casting large-caliber hollow metal tube blank Download PDFInfo
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- CN102211161B CN102211161B CN201110140473A CN201110140473A CN102211161B CN 102211161 B CN102211161 B CN 102211161B CN 201110140473 A CN201110140473 A CN 201110140473A CN 201110140473 A CN201110140473 A CN 201110140473A CN 102211161 B CN102211161 B CN 102211161B
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Abstract
The invention discloses a method and a device for improving quality of continuous casting large-caliber hollow metal tube blank. In the method and device, an electromagnetic coil is arranged outside an outer crystallizer, a spiral stirring magnetic field generator is placed in an inner crystallizer, and medium and high frequency magnetic fields are applied to metal melts in a pouring cavity formed by the inner crystallizer and the outer crystallizer outside the outer crystallizer while low and working frequency spiral stirring magnetic fields are applied to the metal melts in the pouring cavity inside the inner crystallizer. In the invention, the electromagnetic coil can mainly improve the quality of the outer surface of a hollow pipe blank, the spiral stirring magnetic field generator can effectively improve the quality of the inner surface of the pipe blank and the internal quality, the defects such as non-metallic inclusion, bubbles, segregation and crack can be removed, and macroscopic solidification structure of the pipe blank can be obviously overcome. The method and device disclosed by the invention are applicable to continuous casting of the hollow steel pipe blank with the inner diameter more than 100mm and are also applicable to the continuous casting of the hollow pipe blanks of other alloys.
Description
Technical field
The invention belongs to the preparation field of seamless heavy caliber hollow metal tube blank, specially refer to a kind of continuous casting hollow metal tube blank that improves such as steel pipe base method for quality, and device.
Background technology
Along with the develop rapidly of industries such as China's electric power, petrochemical industry, the demand of high-quality seamless heavy caliber hollow steel pipe is constantly increased.Because work under bad environment is strict to the surfaces externally and internally quality and the solidified structure of tubing.The processing method that seamless heavy caliber hollow steel pipe is commonly used is through continuous casting hollow bloom is obtained tubing through operations such as follow-up rolling, drawings, and the blank quality of continuous casting hollow bloom is directly determining the service property (quality) of metal pipe material.The hollow bloom continuous casting technology is meant on the vertical continuous casting machine, and high-temperature molten steel is poured in the cavity (cast chamber) that is formed by inside and outside crystallizer, solidifies to form constantly to be pulled out behind the certain thickness base shell and form hollow continuous casting billet.Have production efficiency height, using rate of metal advantages of higher though adopt the method for continuous casting to prepare the hollow steel pipe, it usually has shortcomings such as nonmetal slag inclusion, pore, segregation, surface indentation, solidified structure be thick.In order to improve the quality of hollow bloom; Application for a patent for invention (application number 02109370.9) discloses a kind of method of hollow steel pipe electromagnetic continuous-casting; In hollow steel pipe continuous casting process; The crystallizer outside applies and stirs magnetic field or solenoid outside, perhaps applies the resultant field that stirs magnetic field and solenoid simultaneously.This kind method only is suitable for the casting process of small-bore hollow bloom; For bigbore hollow bloom continuous casting; Adopt the required electromagnetic generator volume of this method very huge; On the one hand can have shortcomings such as manufacturing cost height, difficult installation, on the other hand to slab surface quality, especially inner surface quality improves DeGrain.The method that has proposed in aluminium alloy hollow bloom casting process, in inside and outside crystallizer, to place respectively the power frequency solenoid in the article " the different phase continuous casting electromagnetic of hollow bloom " of 2006 " China YouSe Acta Metallurgica Sinica " publication; This method can effectively be improved the surface quality and the solidified structure of aluminum pipe base; But for the steel metalloid pipe continuous casting of density much larger than aluminium alloy; Because weight is big, adopt the method that applies solenoid to improve the effect of solidified structure and not obvious.Disclosed patent application CN101298094A in 2008 has proposed to apply solenoid through crystallizer outside; And the method for in interior crystallizer, placing rotation or row ripple stirring magnetic field generator is improved the hollow bloom method for quality; This method helps to solve defectives such as the segregation knurl, crackle on inside and outside surface, also can improve the solidified structure of pipe significantly, if but be chosen in and apply rotation in the interior crystallizer and stir magnetic field generator; The rotation of molten steel will inevitably make non-metallic inclusion assemble to the center; Though slab surface quality improves, the center field trash might occur and increase and reduce quality, make follow-up stocking produce defective; And apply rotating excitation field; Be easy under the bigger magnetic field intensity in the inner segregation defective that produces of strand, promptly usually said " white band ", strict to the control requirement of magnetic field intensity.Stir magnetic field generator if in interior crystallizer, apply capable ripple; Can make molten steel in mold produce convection current; Wash away the freezing interface, can quicken the come-up of field trash and gas, and be dispersed in crystallizer liquid metal surface; Can improve the internal soundness of strand, but improving effect and can't reach requirement surface quality.
Summary of the invention
In view of the foregoing, the invention provides a kind of new continuous casting heavy caliber hollow metal tube blank method for quality and device that uses said method of improving; In said method and the device; Through the arranged outside solenoid of crystallizer outside; In interior crystallizer, place spiral stirring magnetic field generator simultaneously; Utilize the outer surface quality of outside solenoid ability emphasis solution hollow bloom, and inner spiral stirring magnetic field generator can improve the inner surface quality and the internal soundness of pipe effectively.
Its technical solution is:
A kind of continuous casting heavy caliber hollow metal tube blank method for quality of improving may further comprise the steps:
Step 1, in the outside of the outer crystallizer of hollow metal tube blank continuous casting installation for casting, the metal bath in being poured into the cast chamber that is formed by inside and outside crystallizer applies middle and high frequency magnetic field; The frequency in this middle and high frequency magnetic field is 1000Hz～50000Hz;
In casting process, metal bath constantly is poured in the cast chamber, simultaneously administration step 1 and step 2, and, obtain continuous casting hollow bloom with the bed die in certain speed pulling cast chamber.
Above-mentioned metal pipe is the steel pipe base, and said metal bath is a molten steel.
A kind of device that improves continuous casting heavy caliber hollow metal tube blank quality; The middle and high frequency solenoid that comprises the outer crystallizer outside that is arranged on the hollow metal tube blank continuous casting installation for casting, low, the power frequency spiral stirring magnetic field generator inner with the interior crystallizer that is arranged on the hollow metal tube blank continuous casting installation for casting; Above-mentioned middle and high frequency solenoid feeds alternating current, and the frequency of electric current is 1000Hz～50000Hz; Above-mentioned low, the spiral stirring magnetic field generator of power frequency is made up of the cylindrical housings of the electromagnetic inductor that produces spiral stirring magnetic field, protection electromagnetic inductor and the cooling water channel of cooling electromagnetic inductor; Electromagnetic inductor coiling solenoid on iron core is processed; Solenoid is arranged according to gram winding method; Feed three-phase alternating current; Phase difference between every phase current is 120 °, and the frequency of alternating current is 3 Hz～50Hz, and the mandrel of above-mentioned iron core and the angle between the yoke are 30 °～60 °; Under the effect of three-phase alternating electromagnetism coil magnetic field, make the direction of the inner electromagnetic force that is produced of metal bath that is poured in the cast chamber vertical, at the spiral stirring eddy flow of the inner formation of metal bath with magnetic line of force direction.
Above-mentioned cooling water channel is included in the cooling chamber that forms between the inwall of electromagnetic inductor and cylindrical housings, and is arranged on the water body refluxing opening in cooling water inlet port on the cylindrical housings, the cooling chamber; Adopt outer water direct-cooling type cooling structure that electromagnetic inductor is cooled off.
Above-mentioned iron core comprises vertical mandrel; Solenoid is selected copper tube coil for use; Copper tube coil is nested with on vertical mandrel according to gram winding method; On vertical mandrel, also be provided with several, the yoke of arranging successively from top to bottom, each yoke is approximate round table-like, the sidewall of yoke is 30 °～60 ° with the vertical axial line angle of mandrel.
The present invention has following useful technique effect:
The present invention applies solenoid in the crystallizer outside outside; In interior crystallizer, place spiral stirring magnetic field generator simultaneously; But solve the outer surface quality of hollow bloom through the solenoid emphasis; And spiral stirring magnetic field generator can effectively improve the inner surface quality and the internal soundness of pipe, removes defectives such as non-metallic inclusion, bubble, segregation, crackle, and can improve macroscopical solidified structure of pipe significantly.In addition, in interior crystallizer, place spiral stirring magnetic field generator, be convenient to operation on the one hand; The volume of this magnetic field generator is little on the other hand; Efficient is high, is suitable for being placed on the inside of interior crystallizer especially, and the metal bath that is in its cast chamber, outside is produced spiral stirring action.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described further:
Fig. 1 is the structural principle sketch map of a kind of embodiment of installing among the present invention, also shows the relevant portion of hollow metal tube blank continuous casting installation for casting (machine) in the lump.
Fig. 2 is the structural principle sketch map of low, the spiral stirring magnetic field generator of power frequency in Fig. 1 mode.
Fig. 3 is a helical stir principle schematic low, the spiral stirring magnetic field generator of power frequency.
The specific embodiment
Referring to Fig. 1, Fig. 2 and Fig. 3; A kind of device that improves continuous casting heavy caliber hollow metal tube blank quality; This device is applicable to hollow metal tube blank continuous casting installation for casting (machine); This continuous casting installation for casting comprises outer crystallizer 3, interior crystallizer 4, forms cast chamber 8 between interior crystallizer 4 and the outer crystallizer 3, and the bottom in cast chamber 8 is provided with the bed die 5 that can spur.Said apparatus comprises the middle and high frequency solenoid 1 that is arranged on outer crystallizer 3 outsides, with low, the spiral stirring magnetic field generator 2 of power frequency that are arranged on interior crystallizer 4 inside.Above-mentioned middle and high frequency solenoid feeds alternating current, and the frequency of electric current is 1000Hz～50000Hz.Above-mentioned low, the spiral stirring magnetic field generator 2 of power frequency comprises cylindrical housings 201, be arranged on the inner iron core 202 of cylindrical housings, be arranged on the solenoid 203 on the iron core 202; The inner chamber of cylindrical housings is a cooling chamber 204; Cylindrical housings is provided with cooling water inlet port 205 and the interior water body refluxing opening 206 of cooling chamber; The solenoid of arranging according to gram winding method 203 feeds the three phase low frequency alternating current; The frequency of alternating current is 3Hz～50Hz, utilizes the cooling water that gets in the cooling chamber that solenoid is cooled off, and takes away the heat that solenoid 203 produces.Angle between the mandrel of above-mentioned iron core 202 formed yokes and iron core is 30 °～60 °; Under the effect of this coil magnetic field, make the direction of the inner electromagnetic force that is produced of metal bath 7 (such as molten steel) that is poured in the cast chamber vertical with magnetic line of force direction; At the spiral stirring eddy flow of the inner formation of metal bath; Promptly behind the downward-sloping certain angle of yoke; The direction of the magnetic line of force that in metal bath (metal bath), produces is corresponding with it, also from the horizontal by certain angle, can know according to the left hand helix rule; Therefore the direction of the electromagnetic force that in metal bath, produces is vertical with the magnetic line of force of coil, under the effect of such electromagnetic force, makes to produce spiral electromagnetic agitation in the metal bath; Emphasis is referring to Fig. 3, and the helical curve in the diagram is represented the direction of spiral stirring eddy flow, and symbol B representes magnetic induction intensity, and its direction is a magnetic line of force direction, and symbol F representes electromagnetic force, and symbol I representes induced-current.More concrete is: above-mentioned iron core 202 comprises vertical mandrel 2021; Solenoid 203 is selected copper tube coil for use; Be nested with on vertical mandrel; On vertical mandrel, also be provided with several, the yoke 2022 of arranging successively from top to bottom, each yoke 2022 is approximate round table-like, the sidewall of yoke is 30 °～60 ° with the vertical axial line angle of mandrel.
A kind of continuous casting heavy caliber hollow metal tube blank method for quality of improving may further comprise the steps:
Step 1 utilizes middle and high frequency solenoid 1 to apply middle and high frequency magnetic field at the metal bath 7 that the lateral is poured in the cast chamber; The frequency in this middle and high frequency magnetic field is 1000Hz～50000Hz;
In casting process, metal bath such as molten steel constantly is poured in the cast chamber, simultaneously administration step 1 and step 2, and, obtain continuous casting hollow bloom 6 with the bed die 5 in certain speed pulling cast chamber.
Stress again below among the present invention that the spiral stirring magnetic field generator of, power frequency low in the interior crystallizer set inside promptly applies the difference of stirring magnetic field in spiral stirring magnetic field and other prior aries in interior crystallizer inside:
One, compare rotation and row ripple stirring magnetic field, the spiral stirring magnetic field among the present invention has more advantage
Apply spiral stirring magnetic field; Can produce the spiral revolving force; Make metal bath such as molten steel produce the stirring movement that spiral rises or descends, compare rotary stirring magnetic field and travelling-wave-type and stir magnetic field, it can more effectively improve slab surface quality, internal soundness and solidified structure.
Spiral stirring magnetic field can impel be mingled with, gas separates come-up with metal bath, and assembles to the liquid level center, the removing that helps being mingled with can be avoided being mingled with, defective such as pore.Experiment shows: under the essentially identical condition of mixing power; The content of field trash when the content of field trash is starkly lower than rotation stirring and the stirring of row ripple in the ingot casting under the spiral stirring action, the content of the interior field trash of strand only is the half the of rotation stirring under the spiral stirring action.
The helical magnetic field distribution of electromagnetic force helps forming the even stirring in big zone, to forming equiax crystal obvious facilitation is arranged.Compare rotation and stir and go the ripple stirring, the equiaxial crystal ratio that helical stir obtains is the highest.Expansion and refinement equiax crystal band can increase the strand crack resistance, eliminate central pipe, alleviate center porosity and center segregation.
Two, in interior crystallizer, apply spiral stirring magnetic field than the advantage that externally applies
Through in the interior crystallizer of continuous casting hollow bloom, applying spiral stirring magnetic field following advantage is arranged:
1) above-mentioned spiral stirring magnetic field generator is rational in infrastructure, compact, has characteristics such as volume is little, utilization rate of electrical is higher, and can not hinder outside that the crystallizer place applies electromagnetic field, is convenient to operation.
2) in interior crystallizer, apply spiral stirring magnetic field can make pipe interior crystallizer side electromagnetic force greater than outside crystallizer side electromagnetic force; Therefore be greater than the flowing velocity of outer crystallizer side melt near the flowing velocity of interior crystallizer side melt; So more help improving interior crystallizer side slab surface quality (as can better eliminate inner surface be mingled with, alleviate ripple mark etc.) and solidified structure (equiaxial crystal ratio like the internal surface of bloom side is higher); And because internal surface of bloom is not easy to mill the face processing, if inner surface exists defective can directly cause the tubing defective.Therefore, in interior crystallizer, apply spiral stirring magnetic field and compare the quality of more effectively improving pipe at the outside placement stirring of pipe magnetic field energy.
The method that the present invention proposes is applicable to the continuous casting of the hollow steel pipe that interior diameter 100mm is above, also is applicable to the continuous casting of the hollow bloom of other types alloy.
Need to prove; Those of ordinary skill in the art is under the instruction of this specification; Not breaking away under the scope situation that claim of the present invention protects, can also make various deformation such as replacement, simple combination, these all fall within protection scope of the present invention.
Claims (1)
1. device that improves continuous casting heavy caliber hollow metal tube blank quality; It is characterized in that comprising the middle and high frequency solenoid in the outer crystallizer outside that is arranged on the hollow metal tube blank continuous casting installation for casting, low, the power frequency spiral stirring magnetic field generator inner with the interior crystallizer that is arranged on the hollow metal tube blank continuous casting installation for casting; Above-mentioned middle and high frequency solenoid feeds alternating current, and the frequency of electric current is 1000Hz～50000Hz; Said low, the spiral stirring magnetic field generator of power frequency is made up of the cylindrical housings of the electromagnetic inductor that produces spiral stirring magnetic field, protection electromagnetic inductor and the cooling water channel of cooling electromagnetic inductor; Electromagnetic inductor coiling solenoid on iron core is processed; Solenoid is arranged according to gram winding method; Feed three-phase alternating current; Phase difference between every phase current is 120 °, and the frequency of alternating current is 3Hz～50Hz, and the mandrel of above-mentioned iron core and the angle between the yoke are 30 °～60 °; Under the effect of three-phase alternating electromagnetism coil magnetic field, make the direction of the inner electromagnetic force that is produced of metal bath that is poured in the cast chamber vertical, at the spiral stirring eddy flow of the inner formation of metal bath with magnetic line of force direction;
Said cooling water channel is included in the cooling chamber that forms between the inwall of electromagnetic inductor and cylindrical housings, and is arranged on the water body refluxing opening in cooling water inlet port on the cylindrical housings, the cooling chamber; Adopt outer water direct-cooling type cooling structure that electromagnetic inductor is cooled off;
Said iron core comprises vertical mandrel; Solenoid is selected copper tube coil for use; Copper tube coil is nested with on vertical mandrel according to gram winding method; On vertical mandrel, also be provided with several, the yoke of arranging successively from top to bottom, each yoke is approximate round table-like, the sidewall of yoke is 30 °～60 ° with the vertical axial line angle of mandrel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110140473A CN102211161B (en) | 2011-05-27 | 2011-05-27 | Method and device for improving quality of continuous casting large-caliber hollow metal tube blank |
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| CN201110140473A CN102211161B (en) | 2011-05-27 | 2011-05-27 | Method and device for improving quality of continuous casting large-caliber hollow metal tube blank |
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| CN102211161B true CN102211161B (en) | 2012-10-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103447490B (en) * | 2013-09-04 | 2015-07-01 | 青岛理工大学 | Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet |
| CN108526424B (en) * | 2018-04-09 | 2020-11-24 | 上海大学 | Magnetic field generator of dual-frenquency electromagnetic stirring |
| CN110340316A (en) * | 2019-07-11 | 2019-10-18 | 张家港高合特种合金材料有限公司 | A kind of preparation method and device of easy segregation-alloy pipe |
| CN112974749A (en) * | 2021-02-09 | 2021-06-18 | 东北大学 | Electromagnetic stirring device and method for improving feeding capacity and center quality of casting blank liquid core |
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|---|---|---|---|---|
| CN1288787A (en) * | 1999-09-22 | 2001-03-28 | 大连理工大学 | Continuous casting method using electromayhetic cast mold with unequal width gaps |
| JP2001321903A (en) * | 2000-03-09 | 2001-11-20 | Kawasaki Steel Corp | Method for producing continuously cast slab |
| CN1380153A (en) * | 2002-03-27 | 2002-11-20 | 大连理工大学 | Electromagnetic continuous casting method of hollow metal tube blank |
| CN101298094A (en) * | 2008-03-19 | 2008-11-05 | 大连理工大学 | Method for improving quality of continuous casting hollow bloom by applying composite alternating electromagnetic field and device |
| CN101391291A (en) * | 2008-11-05 | 2009-03-25 | 江苏大学 | Metal matrix composition home-position synthesizing method in combined electric magnetic field |
| EP2269750A1 (en) * | 2008-04-28 | 2011-01-05 | Sumitomo Metal Industries, Ltd. | Method for continuous casting of steel and electromagnetic stirrer usable therefor |
| CN202146981U (en) * | 2011-05-27 | 2012-02-22 | 青岛理工大学 | Device for improving the quality of a continuous-casting large-diameter hollow metal pipe blank |
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2011
- 2011-05-27 CN CN201110140473A patent/CN102211161B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288787A (en) * | 1999-09-22 | 2001-03-28 | 大连理工大学 | Continuous casting method using electromayhetic cast mold with unequal width gaps |
| JP2001321903A (en) * | 2000-03-09 | 2001-11-20 | Kawasaki Steel Corp | Method for producing continuously cast slab |
| CN1380153A (en) * | 2002-03-27 | 2002-11-20 | 大连理工大学 | Electromagnetic continuous casting method of hollow metal tube blank |
| CN101298094A (en) * | 2008-03-19 | 2008-11-05 | 大连理工大学 | Method for improving quality of continuous casting hollow bloom by applying composite alternating electromagnetic field and device |
| EP2269750A1 (en) * | 2008-04-28 | 2011-01-05 | Sumitomo Metal Industries, Ltd. | Method for continuous casting of steel and electromagnetic stirrer usable therefor |
| CN101391291A (en) * | 2008-11-05 | 2009-03-25 | 江苏大学 | Metal matrix composition home-position synthesizing method in combined electric magnetic field |
| CN202146981U (en) * | 2011-05-27 | 2012-02-22 | 青岛理工大学 | Device for improving the quality of a continuous-casting large-diameter hollow metal pipe blank |
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