CN103447490A - 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
- Publication number
- CN103447490A CN103447490A CN2013103959241A CN201310395924A CN103447490A CN 103447490 A CN103447490 A CN 103447490A CN 2013103959241 A CN2013103959241 A CN 2013103959241A CN 201310395924 A CN201310395924 A CN 201310395924A CN 103447490 A CN103447490 A CN 103447490A
- Authority
- CN
- China
- Prior art keywords
- magnetic field
- crystallizer
- current
- hollow
- remove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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, specially refer to a kind of combined electrical magnetic field that adopts and remove non-metallic inclusion in continuously cast billet for pipe-making in casting process, and then improve method and the device of pipe degree of purity.
Background technology
Aero-Space along with China, petrochemical industry, high ferro, the fast development of the industries such as wind-powered electricity generation, high end bearing demand is increased substantially, the pressure fluid feed-line of using as petrochemical industry, on Aero-Space and high ferro for the manufacture of the rolling element of rolling bearing and lasso etc., these bearings are bearing pressure and frictional force greatly when work, uniform hardness and wearability so require bearing steel that height is arranged, and high elastic limit, therefore to the uniformity of the chemical composition of bearing steel, the content of non-metallic inclusion and distribution etc. require all very strict, as for the precision bearing steel, the field trash of 50 μ m sizes does not allow to exist, to require one of the strictest steel grade during all iron and steel are produced.
The raw-material degree of purity of bearing steel is determining the degree of purity of final part; along with the requirement of environmental protection, the saving energy is more and more higher; the production of bearing steel billet has been experienced by being molded to continuous casting again to the transformation of hollow bloom continuous casting; the hollow bloom continuous casting is near net shape casting; can save perforation process; significantly improve production efficiency, saved the energy.
In casting process, usually at large bag and tundish stage, adopt the method stirred of blowing can remove the oarse-grained non-metallic inclusion of part, 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 nonmetal inclusion composition granule, for the floating of small sized particles, has no significant effect; And the electromagnetism extrusion applies solenoid in casting process, by the electromagnetic pinch force removal of inclusions, better near the inclusion removal effect continuous casting billet top layer, but the removal effect to the field trash of melt central part is not obvious, for continuous casting hollow bloom, emphasis is the field trash that solves the inside and outside top layer of pipe, if adopt the electromagnetism extrusion not obvious near the removal effect of non-metallic inclusion internal surface of bloom, therefore should not adopt; Electromagnetic agitation stirs magnetic field by applying in the continuous casting billet outside, by mixing power, impel small sized particles mutually to collide the formation large-size particle, thereby rely on the buoyancy floating of particle to be removed, but for the hollow bloom continuous casting, owing to there being inside and outside two crystallizers, two walls have increased the viscous force of particle floating, simultaneously, if the density of non-metallic inclusion and fusant density are more approaching, remove efficiency lower.Also has a kind of quality of improving continuously cast billet for pipe-making by the method that applies solenoid and helical magnetic field in the pipe casting process, the main purpose of the method is for crystal grain thinning, improve the surfaces externally and internally quality of pipe, also not obvious to the removal effect of small size inclusion particle.
In a word, above technical approach all can't 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 is removed nonmetal impurities in casting process needs further to improve.
Summary of the invention
Task of the present invention is to solve prior art hollow core pipe and removes the technological deficiency that the mode of nonmetal impurities exists in casting process, a kind of remove non-metallic inclusion in hollow bloom casting process method is provided, and the device of removing non-metallic inclusion in a kind of hollow bloom casting process.
Its technical solution is:
Remove the method for non-metallic inclusion in a kind of hollow bloom casting process, comprise the following steps:
Step 1, the outside at the outer crystallizer of hollow metal tube blank continuous casting installation for casting, apply Stirring magnetic field to the metal bath be poured in the cast chamber formed by inside and outside crystallizer, pass into three-phase alternating current in the coil in this Stirring magnetic field, its frequency range is 5～60Hz, and size of current is 50～600A;
In casting process, metal bath constantly is poured in the cast chamber, synchronous administration step 2 in administration step 1, or in the process discontinuous steps performed 2 of administration step 1, and pull the bed die in cast chamber with certain speed, obtain continuous casting hollow bloom.
Above-mentioned hollow metal tube blank is the steel pipe base, and described metal bath is molten steel, and the external diameter of steel pipe base is that 500mm, internal diameter are the above continuous casting hollow bloom of 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 the 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 the row ripple stirs magnetic field is 700～800Hz.
Remove the device of non-metallic inclusion in a kind of hollow bloom casting process, comprise outer crystallizer and interior crystallizer, form the cast 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 that is arranged on the outer crystallizer outside, with the capable ripple that is arranged on interior crystallizer inside, stirs magnetic sensors.
The above line ripple stirs magnetic sensors and comprises the first electromagnetic inductor, cooling water channel and cylindrical housings, the first electromagnetic inductor is to be made by the first solenoid of coiling on the first iron core 402, the first solenoid is arranged 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, the second electromagnetic inductor is to be made by 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 useful technique effect:
The present invention considers the characteristics of continuous casting hollow bloom, apply a kind of combined electric magnetic field and remove the nonmetal inclusion composition granule, apply rotary stirring magnetic field at the outer crystallizer place of continuously cast billet for pipe-making, apply travelling-wave-type and stir magnetic field simultaneously in the interior crystallizer of continuously cast billet for pipe-making, it removes principle: outside pipe, the crystallizer place applies rotary stirring magnetic field, under the effect of stirring magnetic field centrifugal force, non-metallic inclusion is easily assembled near the hollow bloom inwall, and collision forms large-sized inclusion particle mutually, simultaneously, apply travelling-wave-type and stir magnetic field in interior crystallizer, produce larger upwards electromagnetic force near tube blank inner wall, be gathered near the larger buoyancy of field trash acquisition of inwall thereby impel, therefore remove non-metallic inclusion.The present invention can also remove undersized non-metallic inclusion when in the hollow bloom casting process, comparatively thoroughly removing large-sized nonmetal inclusion composition granule more effectively.
The 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 that is 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 capable ripple stirring magnetic sensors that capable ripple stirs magnetic field to being poured into metal bath in the cast chamber formed by inside and outside crystallizer in said apparatus.
Shown in Fig. 3 is can be to the Stirring magnetic sensors that is poured into metal bath in the cast chamber formed by inside and outside crystallizer and applies Stirring magnetic field in said apparatus.
The specific embodiment
In conjunction with Fig. 1, Fig. 2 and Fig. 3, at first be necessary to exemplify a kind of device that is 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, form cast chamber 3 between interior crystallizer 2 and outer crystallizer 1, the bottom in cast chamber 3 is provided with the bed die that can pull.Said apparatus also comprises the Stirring magnetic sensors 5 that is arranged on the outer crystallizer outside, with the capable ripple that is arranged on interior crystallizer inside, stirs magnetic sensors 4.The above line ripple stirs magnetic sensors 4 and comprises the first electromagnetic inductor 401, cooling water channel and cylindrical housings (not shown), the first electromagnetic inductor is to be made by the first solenoid 403 of coiling on the first iron core 402, the first solenoid is arranged 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 preferred 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, the electromagnetic force at hollow bloom inner surface place will be much larger than the electromagnetic force away from hollow bloom inner surface place, be conducive to like this inclusion floating of impelling top layer to assemble, and can not make to enter melt inside away from the field trash of surface layer.The travelling-magnetic-field applied can be that continuity applies, and also can intermittence apply, like this can be 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), the second electromagnetic inductor is to be made by 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 °, draw in order to make in melt to produce enough large electromagnetic agitation centrifugal force non-metallic inclusion is aggregated near internal surface of bloom by preliminary test, need larger electric current, size of current is 50～600A, be preferably 300～600A, more preferred 400～500A, its frequency range is 5～60Hz.
Preferably, in order to prevent that non-metallic inclusion is solidified the base shell and catches, the complete liquid phase region of metal bath (such as molten steel) should be injected in the center in Stirring magnetic field in the 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, the outside at the outer crystallizer of hollow metal tube blank continuous casting installation for casting, apply Stirring magnetic field to the metal bath be poured in the cast chamber formed by inside and outside crystallizer, pass into three-phase alternating current in the coil in this Stirring magnetic field, its frequency range is 5～60Hz, and size of current is 50～600A;
In casting process, metal bath constantly is poured in the cast chamber, the synchronous execution and step 2 in administration step 1, and the travelling-magnetic-field that applied 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 constantly is poured in the cast chamber, process discontinuous steps performed 2 in administration step 1, the travelling-magnetic-field that applied is that intermittence applies, like this can be 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 the row ripple stirs magnetic field is 500～650Hz.This optimal way, not only can remove large-sized nonmetal inclusion composition granule up hill and dale, to the clearance of small size inclusion particle, can reach 70%.
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 the row ripple stirs magnetic field is 850～1000Hz.This optimal way, not only can remove large-sized nonmetal inclusion composition granule up hill and dale, to the clearance of small size inclusion particle, can reach 80%.
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 the row ripple stirs magnetic field is 700～800Hz.This optimal way, not only can remove large-sized nonmetal inclusion composition granule more up hill and dale, to the clearance of small size inclusion particle, can reach 90% especially; But also can improve significantly macroscopical solidified structure of pipe.
Hollow metal tube blank in the present invention is the 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, it is that 500mm, internal diameter are the above continuous casting hollow bloom of 200mm that the present invention is specially adapted to produce external diameter.
It should be noted that, under the instruction of this specification, 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 be within protection scope of the present invention.
Claims (7)
1. remove the method for non-metallic inclusion in a hollow bloom casting process, it is characterized in that comprising the following steps:
Step 1, the outside at the outer crystallizer of hollow metal tube blank continuous casting installation for casting, apply Stirring magnetic field to the metal bath be poured in the cast chamber formed by inside and outside crystallizer, pass into three-phase alternating current in the coil in this Stirring magnetic field, its frequency range is 5～60Hz, and size of current is 50～600A;
Step 2, inboard at the interior crystallizer of hollow metal tube blank continuous casting installation for casting, apply capable ripple stirring magnetic field to the metal bath be poured in the cast chamber formed by inside and outside crystallizer, pass into three-phase alternating current in the coil in this row ripple stirring magnetic field, its frequency range is 50～1000Hz, and size of current is 50～150A;
In casting process, metal bath constantly is poured in the cast chamber, synchronous administration step 2 in administration step 1, or in the process discontinuous steps performed 2 of administration step 1, and pull the bed die in cast chamber with certain speed, obtain continuous casting hollow bloom.
2. remove the method for non-metallic inclusion in a kind of hollow bloom casting process according to claim 1, it is characterized in that: above-mentioned hollow metal tube blank is the steel pipe base, described metal bath is molten steel, and the external diameter of steel pipe base is that 500mm left and right, internal diameter are the above continuous casting hollow bloom of 200mm.
3. remove the method for non-metallic inclusion in a kind of hollow bloom casting process according to claim 1, it is characterized in that: 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 the row ripple stirs magnetic field is 500～1000Hz.
4. remove the method for non-metallic inclusion in a kind of hollow bloom casting process according to claim 3, it is characterized in that: 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 the row ripple stirs magnetic field is 700～800Hz.
5. remove the method for non-metallic inclusion in a kind of hollow bloom casting process according to claim 1, it is characterized in that: in the process discontinuous steps performed 2 of administration step 1, the resting period is 1～3s.
6. remove the device of non-metallic inclusion in a hollow bloom casting process, comprise outer crystallizer and interior crystallizer, form the cast chamber between interior crystallizer and outer crystallizer, the bottom of pouring into a mould chamber is provided with the bed die that can pull; It is characterized in that: said apparatus also comprises the Stirring magnetic sensors that is arranged on the outer crystallizer outside, with the capable ripple that is arranged on interior crystallizer inside, stirs magnetic sensors.
7. remove the device of non-metallic inclusion in a kind of hollow bloom casting process according to claim 6, it is characterized in that: the above line ripple stirs magnetic sensors and comprises the first electromagnetic inductor, cooling water channel and cylindrical housings, the first electromagnetic inductor is to be made by the first solenoid of coiling on the first iron core, the first solenoid is arranged 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, the second electromagnetic inductor is to be made by 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310395924.1A CN103447490B (en) | 2013-09-04 | 2013-09-04 | Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310395924.1A CN103447490B (en) | 2013-09-04 | 2013-09-04 | Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103447490A true CN103447490A (en) | 2013-12-18 |
| CN103447490B CN103447490B (en) | 2015-07-01 |
Family
ID=49730549
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310395924.1A Expired - Fee Related CN103447490B (en) | 2013-09-04 | 2013-09-04 | Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103447490B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108339963A (en) * | 2018-03-29 | 2018-07-31 | 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3236422B2 (en) * | 1992-10-16 | 2001-12-10 | 川崎製鉄株式会社 | Continuous casting method of steel using magnetic field |
| 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 |
| CN102211161A (en) * | 2011-05-27 | 2011-10-12 | 青岛理工大学 | Method and device for improving quality of continuous casting large-caliber hollow metal tube blank |
| CN102527956A (en) * | 2012-02-21 | 2012-07-04 | 衡阳华菱钢管有限公司 | Continuous-cast P91-steel round pipe billet and production process thereof |
| 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 |
-
2013
- 2013-09-04 CN CN201310395924.1A patent/CN103447490B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3236422B2 (en) * | 1992-10-16 | 2001-12-10 | 川崎製鉄株式会社 | Continuous casting method of steel using magnetic field |
| 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 |
| CN102211161A (en) * | 2011-05-27 | 2011-10-12 | 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 |
| CN102527956A (en) * | 2012-02-21 | 2012-07-04 | 衡阳华菱钢管有限公司 | Continuous-cast P91-steel round pipe billet and production process thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108339963A (en) * | 2018-03-29 | 2018-07-31 | 东北大学 | A kind of difference phase travelling-magnetic-field electromagnetic casting method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103447490B (en) | 2015-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102179505B (en) | Method for refining metal solidification structure by using pulsed magnet field and pulse current with same frequency | |
| CN103447490B (en) | Method and device for removing nonmetal inclusions during process of continuously casting hollow pipe billet | |
| CN103331435A (en) | Method for controlling metal solidification phase texture in combined mode through external rotating magnetic field and current and fusion casting device of method | |
| CN101244451A (en) | Method and apparatus for improving horizontal continuous casting billet quality by applying composite field | |
| CN104107891B (en) | The electromagnetic inductor of continuous casting crystallizer for plate billet electromagnetic mixing apparatus | |
| CN1314501C (en) | Electromagnetic semicontinuous casting method of aluminium alloy pipe material and its casting device | |
| CN102806323B (en) | Equipment for producing aluminum alloy hollow casting ingot and method of equipment | |
| CN104209499A (en) | Low frequency pulsed magnet field fine-grain solidification method for causing melt oscillation through electromagnetic force | |
| CN109663892B (en) | Progressive solidification forming device for large cast ingot or casting blank | |
| CN103162550B (en) | A kind for the treatment of apparatus and method of casting use metal bath | |
| TWI268820B (en) | Method for producing ultra low carbon steel slab | |
| CN102211161B (en) | Method and device for improving quality of continuous casting large-caliber hollow metal tube blank | |
| CN1142045C (en) | Continuous metal casting method with applied composite electromagnetic field | |
| CN202146981U (en) | Device for improving the quality of a continuous-casting large-diameter hollow metal pipe blank | |
| KR20120052540A (en) | Mold for die casting and die casting apparatus using the same | |
| JP5032422B2 (en) | Electromagnetic stirring casting method and apparatus | |
| CN101298094A (en) | Method for improving quality of continuous casting hollow bloom by applying composite alternating electromagnetic field and device | |
| CN110545935A (en) | Method and device for producing ingots made of metal | |
| CN108188366B (en) | Magnesium alloy semicontinuous casting grain refinement device and method | |
| CN201603845U (en) | Electromagnetic-forming casting equipment of torpedo cabin casting | |
| CN102642013A (en) | Method and device for improving quality of high-temperature alloy master alloy ingot by applying compound electromagnetic field | |
| CN201529757U (en) | Horizontal continuous casting graphite crystallizer | |
| CN203390172U (en) | Magnetic-stirring circulating cooling tubular crystallizer | |
| CN105478695A (en) | Multi-zone electromagnetic stirring device and method for continuous casting machine crystallizer | |
| CN101385953A (en) | Separate type electromagnetic agitator and use thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20190904 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |