CN103447490B - Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet - Google Patents
Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet Download PDFInfo
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- CN103447490B CN103447490B CN201310395924.1A CN201310395924A CN103447490B CN 103447490 B CN103447490 B CN 103447490B CN 201310395924 A CN201310395924 A CN 201310395924A CN 103447490 B CN103447490 B CN 103447490B
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Abstract
The invention discloses a method and a device for removing nonmetal inclusions during the process of continuously casting a hollow pipe billet, wherein the method comprises the following steps of (1) on the outer side of an external crystallizer of hollow metal pipe billet continuous casting equipment, applying a rotary stirring magnetic field to molten metal in a pouring cavity, with frequency ranging from 5Hz to 60Hz and current ranging from 50A to 600A; and (2) on the inner side of an internal crystallizer of the hollow metal pipe billet continuous casting equipment, applying a traveling-wave stirring magnetic field to the molten metal in the pouring cavity, with frequency ranging from 50Hz to 1000Hz and current ranging from 50A to 150A; during the process of continuous casting, the molten metal is constantly poured into the pouring cavity; the step (2) is implemented synchronously as the step (1) is implemented; moreover, a bottom die of the pouring cavity is pulled at a certain speed, so that the continuously-cast hollow pipe billet is obtained. By the adoption of the method and the device, during the process of continuously casting the hollow pipe billet, when large-size nonmetal inclusion particles are removed more thoroughly, small-size nonmetal inclusions can be simultaneously removed more effectively.
Description
Technical field
The invention belongs to the preparation field of continuous casting hollow bloom, be related specifically to a kind of combined electrical magnetic field that adopts in casting process and remove non-metallic inclusion in continuously cast billet for pipe-making, and then improve method and the device of pipe degree of purity.
Background technology
Along with the Aero-Space of China, petrochemical industry, high ferro, the fast development of the industries such as wind-powered electricity generation, high end bearing demand is increased substantially, as the pressure fluid feed-line of petrochemical industry, for the manufacture of the rolling element and lasso etc. of rolling bearing in Aero-Space and high ferro, these bearings operationally subject great pressure and frictional force, so require that bearing steel has height and uniform hardness and wearability, and high elastic limit, therefore to the uniformity of the chemical composition of bearing steel, the Content and distribution of non-metallic inclusion etc. require all very strict, as for precision bearing steel, the field trash of 50 μm of sizes does not allow to be existed, require one of the strictest steel grade during all iron and steel are produced.
The raw-material degree of purity of bearing steel decides the degree of purity of final part; along with the requirement of environmental protection, economize energy is more and more higher; the production of bearing steel billet experienced by by being molded to continuous casting again to the transformation of hollow bloom continuous casting; hollow bloom continuous casting is near net shape casting; perforation process can be saved; significantly improve production efficiency, save the energy.
In casting process, usually the method stirred of blowing is adopted can to remove the oarse-grained non-metallic inclusion of part at large bag and tundish stage, and residual field trash just enters in crystallizer by submersed nozzle, the method of the removal of inclusions that this stage adopts mainly contains: electromagnetic braking, electromagnetism extrusion, electromagnetic stirring method, wherein electromagnetic braking is mainly used in removing large-sized non-metallic inclusion particles, and the floating for small sized particles has no significant effect; And namely electromagnetism extrusion applies solenoid in casting process, by electromagnetic pinch force removal of inclusions, better to the inclusion removal effect near continuous casting billet top layer, but it is not obvious to the removal effect of the field trash of melt central part, for continuous casting hollow bloom, emphasis is the field trash solving the inside and outside top layer of pipe, if adopt the removal effect of electromagnetism extrusion to the non-metallic inclusion near internal surface of bloom not obvious, therefore should not adopt; Electromagnetic agitation is namely by applying to stir magnetic field in continuous casting billet outside, small sized particles is impelled mutually to collide formation large-size particle by mixing power, the buoyancy of particle is relied on to float thus remove, but for hollow bloom continuous casting, owing to there are inside and outside two crystallizers, two walls add the viscous force of particle floating, simultaneously, if the density of non-metallic inclusion and fusant density are relatively, then removal efficiency is lower.A kind of method by applying solenoid and helical magnetic field in pipe casting process is also had to improve the quality of continuously cast billet for pipe-making, the main purpose of the method is in order to crystal grain thinning, improve the surfaces externally and internally quality of pipe, not obvious to the removal effect of small size inclusion particle.
In a word, above technical approach all cannot improve the removal efficiency of hollow bloom casting process small-medium size non-metallic inclusion significantly.From above-mentioned, the mode that prior art hollow core pipe removes nonmetal impurities in casting process needs further to improve.
Summary of the invention
Task of the present invention is the technological deficiency that the mode that solution prior art hollow core pipe removes nonmetal impurities in casting process exists, a kind of method removing non-metallic inclusion in hollow bloom casting process is provided, and removes the device of non-metallic inclusion in a kind of hollow bloom casting process.
Its technical solution is:
Remove a method for non-metallic inclusion in hollow bloom casting process, comprise the following steps:
Step 1, in the outside of the outer crystallizer of hollow metal tube blank continuous casting installation for casting, Stirring magnetic field is applied to the metal bath be poured in the cast chamber that formed by inside and outside crystallizer, three-phase alternating current is passed in the coil in this Stirring magnetic field, its frequency range is 5 ~ 60Hz, and size of current is 50 ~ 600A;
Step 2, in the inner side of the interior crystallizer of hollow metal tube blank continuous casting installation for casting, apply row ripple to the metal bath be poured in the cast chamber that formed by inside and outside crystallizer and stir magnetic field, this row ripple stirs in the coil in magnetic field and passes into three-phase alternating current, its frequency range is 50 ~ 1000Hz, and size of current is 50 ~ 150A;
In casting process, metal bath is constantly poured in cast chamber, synchronous administration step 2 while administration step 1, or in the process discontinuous steps performed 2 of administration step 1, and the bed die in cast chamber is pulled with certain speed, obtain continuous casting hollow bloom.
Above-mentioned hollow metal tube blank is steel pipe base, and described metal bath is molten steel, and the external diameter of steel pipe base is 500mm, internal diameter is the continuous casting hollow bloom of more than 200mm.
In above-mentioned steps 1, the size of current in Stirring magnetic field is 300 ~ 600A; In above-mentioned steps 2, the frequency range that row ripple stirs magnetic field is 500 ~ 1000Hz.
In above-mentioned steps 1, the size of current in Stirring magnetic field is 400 ~ 500A; In above-mentioned steps 2, the frequency range that row ripple stirs magnetic field is 700 ~ 800Hz.
Remove a device for non-metallic inclusion in hollow bloom casting process, comprise outer crystallizer and interior crystallizer, formed and pour into a mould chamber between interior crystallizer and outer crystallizer, the bottom in cast chamber is provided with the bed die that can pull; Said apparatus also comprises the Stirring magnetic sensors be arranged on outside outer crystallizer, stirs magnetic sensors with the row ripple being arranged on interior crystallizer inside.
Above-mentioned row ripple stirs magnetic sensors and comprises the first electromagnetic inductor, cooling water channel and cylindrical housings, first electromagnetic inductor is made up of the first solenoid of coiling on the first iron core 402, first solenoid arranges according to gram winding method, pass into three-phase alternating current, phase difference between every phase current is 120 °, its frequency range is 50 ~ 1000Hz, and size of current is 50 ~ 150A; Above-mentioned Stirring magnetic sensors comprises the second electromagnetic inductor, cooling water channel and cylindrical housings, second electromagnetic inductor is made up of the second solenoid of coiling on the second iron core, pass into three-phase alternating current, phase difference between every phase current is 120 °, its frequency range is 5 ~ 60Hz, and size of current is 50 ~ 600A.
The present invention has following Advantageous Effects:
The present invention considers the feature of continuous casting hollow bloom, apply a kind of combined electric magnetic field and remove non-metallic inclusion particles, namely rotary agitator magnetic field is applied at the outer crystallizer place of continuously cast billet for pipe-making, in the interior crystallizer of continuously cast billet for pipe-making, apply travelling-wave-type simultaneously stir magnetic field, it removes principle: at pipe, outer crystallizer place applies rotary agitator magnetic field, under the effect of stirring magnetic field centrifugal force, non-metallic inclusion is easily assembled near hollow bloom inwall, and collision forms large-sized inclusion particle mutually, simultaneously, in interior crystallizer, apply travelling-wave-type stir magnetic field, larger upwards electromagnetic force is produced near tube blank inner wall, thus impel the field trash be gathered near inwall to obtain larger buoyancy, therefore non-metallic inclusion is removed.The present invention can also remove undersized non-metallic inclusion comparatively thoroughly remove large-sized non-metallic inclusion particles in hollow bloom casting process while more effectively.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the present invention is further described:
Fig. 1 is a kind of structural principle schematic diagram being applicable to remove in a kind of hollow bloom casting process of the present invention the device of non-metallic inclusion.
Shown in Fig. 2 is can apply the row ripple that row ripple stirs magnetic field and stir magnetic sensors to being poured into metal bath in the cast chamber that formed by inside and outside crystallizer in said apparatus.
Shown in Fig. 3 is can apply the Stirring magnetic sensors in Stirring magnetic field to being poured into metal bath in the cast chamber that formed by inside and outside crystallizer in said apparatus.
Detailed description of the invention
Composition graphs 1, Fig. 2 and Fig. 3, first be necessary to exemplify a kind of device being applicable to remove in a kind of hollow bloom casting process of the present invention non-metallic inclusion, this device is applicable to hollow metal tube blank continuous casting installation for casting (machine), comprise outer crystallizer 1, interior crystallizer 2, formed between interior crystallizer 2 and outer crystallizer 1 and pour into a mould chamber 3, the bottom in cast chamber 3 is provided with the bed die that can pull.Said apparatus also comprises the Stirring magnetic sensors 5 be arranged on outside outer crystallizer, stirs magnetic sensors 4 with the row ripple being arranged on interior crystallizer inside.Above-mentioned row ripple stirs magnetic sensors 4 and comprises the first electromagnetic inductor 401, cooling water channel and cylindrical housings (not shown), first electromagnetic inductor is made up of the first solenoid 403 of coiling on the first iron core 402, first solenoid arranges according to gram winding method, pass into three-phase alternating current, phase difference between every phase current is 120 °, size of current is 50 ~ 150A, the frequency of alternating current is 50 ~ 1000Hz, be preferably 500 ~ 1000Hz, more preferably 700 ~ 800Hz, by preliminary test must go on a journey frequency that ripple stirs magnetic field slightly height be because the higher kelvin effect of frequency is more obvious, then the electromagnetic force at hollow bloom inner surface place will much larger than the electromagnetic force away from hollow bloom inner surface place, be conducive to the inclusion floating impelling top layer to assemble like this, and the field trash away from surface layer can not be made to enter melt inside.The travelling-magnetic-field applied can be that continuity applies, and also can intermittently apply, like this can to the polymerization time of the non-metallic inclusion abundance under rotary magnetic field stirring, and the resting period is preferably 1 ~ 3s.Above-mentioned Stirring magnetic sensors 5 comprises the second electromagnetic inductor 501, cooling water channel and cylindrical housings (not shown), second electromagnetic inductor is made up of the second solenoid 503 of coiling on the second iron core 502, pass into three-phase alternating current, phase difference between every phase current is 120 °, being drawn by preliminary test makes non-metallic inclusion be aggregated near internal surface of bloom to make to produce enough large electromagnetic agitation centrifugal force in melt, need larger electric current, size of current is 50 ~ 600A, be preferably 300 ~ 600A, more preferably 400 ~ 500A, its frequency range is 5 ~ 60Hz.
Preferably, be solidified base shell to prevent non-metallic inclusion to catch, the center in Stirring magnetic field should be in the complete liquid phase region of injection metal bath (such as molten steel) in cast chamber, and the center in Stirring magnetic field is a little more than the center of travelling-magnetic-field.
In conjunction with said apparatus, remove the method for non-metallic inclusion in a kind of hollow bloom casting process of the present invention, comprise the following steps:
Step 1, in the outside of the outer crystallizer of hollow metal tube blank continuous casting installation for casting, Stirring magnetic field is applied to the metal bath be poured in the cast chamber that formed by inside and outside crystallizer, three-phase alternating current is passed in the coil in this Stirring magnetic field, its frequency range is 5 ~ 60Hz, and size of current is 50 ~ 600A;
Step 2, in the inner side of the interior crystallizer of hollow metal tube blank continuous casting installation for casting, apply row ripple to the metal bath be poured in the cast chamber that formed by inside and outside crystallizer and stir magnetic field, this row ripple stirs in the coil in magnetic field and passes into three-phase alternating current, its frequency range is 50 ~ 1000Hz, and size of current is 50 ~ 150A;
In casting process, metal bath is constantly poured in cast chamber, synchronously implements and step 2 while administration step 1, and namely applied travelling-magnetic-field is that continuity applies, and pulls the bed die in cast chamber with certain speed, obtains continuous casting hollow bloom.
Preferably, in casting process, metal bath is constantly poured in cast chamber, in the process discontinuous steps performed 2 of administration step 1, namely applied travelling-magnetic-field is intermittent applying, like this can to the polymerization time of the non-metallic inclusion abundance under rotary magnetic field stirring, the resting period is preferably 1 ~ 3s.
Preferably, in above-mentioned steps 1, the size of current in Stirring magnetic field is 300 ~ 350A; In above-mentioned steps 2, the frequency range that row ripple stirs magnetic field is 500 ~ 650Hz.This preferred embodiment, can not only remove large-sized non-metallic inclusion particles up hill and dale, can reach 70% to the clearance of small size inclusion particle.
Preferably, in above-mentioned steps 1, the size of current in Stirring magnetic field is 550 ~ 600A; In above-mentioned steps 2, the frequency range that row ripple stirs magnetic field is 850 ~ 1000Hz.This preferred embodiment, can not only remove large-sized non-metallic inclusion particles up hill and dale, can reach 80% to the clearance of small size inclusion particle.
More preferably, in above-mentioned steps 1, the size of current in Stirring magnetic field is 400 ~ 500A; In above-mentioned steps 2, the frequency range that row ripple stirs magnetic field is 700 ~ 800Hz.This preferred embodiment, can not only remove large-sized non-metallic inclusion particles more up hill and dale, can reach 90% especially to the clearance of small size inclusion particle; But also macroscopical solidified structure of pipe can be improved significantly.
Hollow metal tube blank in the present invention is steel pipe base, and described metal bath is molten steel, and due to the problem of the zone of action of travelling-magnetic-field and rotating excitation field, the present invention is specially adapted to produce that external diameter is 500mm, internal diameter is the continuous casting hollow bloom of more than 200mm.
It should be noted that, under the instruction of this description, those skilled in the art can also make such or such easy variation pattern, such as equivalent way, or obvious mode of texturing.Above-mentioned variation pattern all should within protection scope of the present invention.
Claims (2)
1. remove a method for non-metallic inclusion in hollow bloom casting process, it is characterized in that comprising the following steps:
Step 1, in the outside of the outer crystallizer of hollow metal tube blank continuous casting installation for casting, Stirring magnetic field is applied to the metal bath be poured in the cast chamber that formed by inside and outside crystallizer, three-phase alternating current is passed in the coil in this Stirring magnetic field, its frequency range is 5 ~ 60Hz, and size of current is 400 ~ 500A;
Step 2, in the inner side of the interior crystallizer of hollow metal tube blank continuous casting installation for casting, apply row ripple to the metal bath be poured in the cast chamber that formed by inside and outside crystallizer and stir magnetic field, this row ripple stirs in the coil in magnetic field and passes into three-phase alternating current, its frequency range is 700 ~ 800Hz, and size of current is 50 ~ 150A;
In casting process, metal bath is constantly poured in cast chamber, synchronous administration step 2 while administration step 1, or in the process discontinuous steps performed 2 of administration step 1, and the bed die in cast chamber is pulled with certain speed, obtain continuous casting hollow bloom;
Above-mentioned hollow metal tube blank is steel pipe base, and described metal bath is molten steel, and the external diameter of steel pipe base is about 500mm, internal diameter is the continuous casting hollow bloom of more than 200mm;
In the process discontinuous steps performed 2 of administration step 1, the resting period is 1 ~ 3s.
2. remove a device for non-metallic inclusion in hollow bloom casting process, comprise outer crystallizer and interior crystallizer, formed and pour into a mould chamber between interior crystallizer and outer crystallizer, the bottom in cast chamber is provided with the bed die that can pull; It is characterized in that: said apparatus also comprises the Stirring magnetic sensors be arranged on outside outer crystallizer, stir magnetic sensors with the row ripple being arranged on interior crystallizer inside;
Above-mentioned row ripple stirs magnetic sensors and comprises the first electromagnetic inductor, cooling water channel and cylindrical housings, first electromagnetic inductor is made up of the first solenoid of coiling on the first iron core, first solenoid arranges according to gram winding method, pass into three-phase alternating current, phase difference between every phase current is 120 °, its frequency range is 700 ~ 800Hz, and size of current is 50 ~ 150A; Above-mentioned Stirring magnetic sensors comprises the second electromagnetic inductor, cooling water channel and cylindrical housings, second electromagnetic inductor is made up of the second solenoid of coiling on the second iron core, pass into three-phase alternating current, phase difference between every phase current is 120 °, its frequency range is 5 ~ 60Hz, and size of current is 400 ~ 500A.
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| CN108339963B (en) * | 2018-03-29 | 2019-07-30 | 东北大学 | A kind of difference phase travelling-magnetic-field electromagnetic casting method |
| CN110646580A (en) * | 2019-05-22 | 2020-01-03 | 广东韶钢松山股份有限公司 | Detection method for spring steel wire rod nonmetal impurities |
| CN115383064A (en) * | 2022-08-30 | 2022-11-25 | 上海交通大学 | Continuous liquid-changing hot type continuous casting metal purification method combined with traveling wave magnetic field electromagnetic stirring |
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| JP3236422B2 (en) * | 1992-10-16 | 2001-12-10 | 川崎製鉄株式会社 | Continuous casting method of steel using magnetic field |
| CN1169640C (en) * | 2002-03-27 | 2004-10-06 | 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 |
| CN102211161B (en) * | 2011-05-27 | 2012-10-03 | 青岛理工大学 | Method and device for improving quality of continuous casting large-caliber hollow metal tube blank |
| CN202427909U (en) * | 2011-12-15 | 2012-09-12 | 湖南科美达电气股份有限公司 | Built-in type traveling wave magnetic field electromagnetic mixing sensor |
| CN102527956B (en) * | 2012-02-21 | 2013-08-21 | 衡阳华菱钢管有限公司 | Continuous-cast P91-steel round pipe billet and production process thereof |
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