CN105710357A - Tundish flow control device and method - Google Patents
Tundish flow control device and method Download PDFInfo
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- CN105710357A CN105710357A CN201410734565.2A CN201410734565A CN105710357A CN 105710357 A CN105710357 A CN 105710357A CN 201410734565 A CN201410734565 A CN 201410734565A CN 105710357 A CN105710357 A CN 105710357A
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Abstract
The invention provides a tundish flow control device and method. The flow control device is in the shape of a hollow cylinder, the top face of the device is sealed, at least two rows of flow control holes are formed at equal intervals in the tangential direction of the circumference of the inner wall of the cylinder, and the outer wall of the cylinder is wrapped with a thin shell. The flow control device is arranged on an upper nozzle in a covering mode. In the early stage of molten steel pouring, large-particle inclusions in molten steel are blocked outside the flow control device and cannot directly enter a crystallizer, vortexes are prevented from being generated above the upper nozzle, and a covering agent is also prevented from being involved in the molten steel, so that the cleanliness of a first billet is improved. After the molten steel poured into a tundish reaches a certain height, the thin shell is gradually molten, rotational flow is formed in the flow control device by the molten steel which enters in the tangential direction, the staying time of the molten steel in the tundish is prolonged, the inclusions float further, part of the inclusions in the molten steel are adsorbed by walls of the flow control holes, and therefore flocculation flow of the upper nozzle and flocculation flow of an immersion nozzle of the tundish are restrained; the steel is purified, continuous pouring can be achieved, and the molten steel yield is increased.
Description
Technical field
The invention belongs to continuous-casting art, particularly relate to the devices and methods therefor that the removal of a kind of Metal in Tundish flow control is mingled with and anti-waterstop port wadding flows.
Background technology
The demand for development tundish of clean steel, except controlling molten steel temperature, composition, flow velocity, also need to improve Cleanliness of Molten Steel as much as possible in this container.In order to reach this purpose, each steel mill has carried out many research work, and achieves effect preferably.Wherein adopting maximum means is arrange turbulator, barricade fire tundish filter etc. in tundish.The effect of turbulator is to control the great turbulence level that ladle beam causes in turbulent area, and removes the deoxidation products of converter, ladle slag and secondary oxidation product as much as possible, thus improving the cleannes of steel.The purpose of weir and dam in tundish is to improve molten steel flow characteristic flow field, extends molten steel in the tundish time of staying, enables field trash fully to float, reach the purpose of cleaning molten steel.As its name suggests, the field trash namely passing through to adsorb in molten steel is to reduce steel inclusion for tundish filter.Molten steel injects tundish upper nozzle after being purified by these means.When molten steel injects filling pipe end, forming a vortex above it, this vortex causes that MOLTEN STEEL FLOW changes, and the field trash of some floating may be involved in molten steel again.Especially under low liquid level casting condition, being inevitably rolled in molten steel by field trash or coverture, these slag inclusions are rolled into crystallizer and have little time to float, thus result in the surface defect of strand；When pouring into a mould ultra-low-carbon steel, Al deoxidization steel, due to Al in molten steel2O3Cannot completely remove etc. being mingled with, often tundish upper nozzle and submersed nozzle are wadded a quilt with cotton dead, directly affects being smoothed out of continuous casting production.
Summary of the invention
The present invention provides a kind of device for controlling flow of ladle and method.It is directed to the MOLTEN STEEL FLOW mode by controlling filling pipe end place, reduces and is mingled with and mouth of a river wadding stream, improves the cleanliness factor of molten steel, it is ensured that being smoothed out of cast.
For this, the solution that the present invention takes is:
A kind of device for controlling flow of ladle, it is characterised in that described flow control device is the columnar structured of hollow, cylinder top face closure, is equidistantly provided with at least 2 row flow control holes along cylinder inner wall tangent to periphery direction, and cylinder outer wall is enclosed with one layer of thin outer crust.
The cylinder heights of described flow control device is 300～500mm, and the thickness of cylinder end face and sidewall is 7～15mm, and the internal diameter of cylinder is 4～8 times of tundish upper nozzle internal diameter.
The cross sectional shape in described flow control hole is circular, quincunx or rhombus, and the flow control hole gross area is 5～10 times of tundish upper nozzle inner chamber cross sectional area.
Described flow control hole is arranged on from cylinder below end face 100mm, cylinder bottom surface 50mm range above.
Described thin outer crust adopts thickness to be that 1～5mm steel plate processes.
Described cylinder end face and sidewall material are aluminum zirconium carbonaceous material.
A kind of method applying above-mentioned device for controlling flow of ladle, it is characterised in that:
After the cylinder axis of flow control device and tundish upper nozzle centrage being aligned, button is placed on above tundish upper nozzle, can carry out pouring molten steel；At the pouring molten steel initial stage, under the parcel of thin outer crust, the large inclusions in molten steel is blocked in and cannot be directly entered crystallizer outside flow control device；Produce the dynamic conditions of eddy current simultaneously when eliminating the cast of low liquid level above filling pipe end, make coverture also cannot be involved in molten steel；After the molten steel injecting tundish reach a certain height, along with flow control device thin outer crust is progressively melted, molten steel enters flow control device by flow control hole, the tangential molten steel entered will form eddy flow in flow control device, making molten steel time of staying in tundish increase, field trash is floated further, and part field trash controlled flow hole wall absorption in molten steel, thus inhibiting tundish upper nozzle wadding stream and the formation of soaking water gap wadding stream, steel is made to be purified；With the cast initial stage, there is identical principle and effect during low liquid level cast in cast latter stage.
The invention have the benefit that
1, flow control device outer layer plate is in fusion process after pouring molten steel certain altitude, it is possible to avoids opening the initial stage molten steel carrying large inclusions when watering and is directly entered crystallizer, improves head base cleanliness factor.
2, can controlling MOLTEN STEEL FLOW mode in tundish, extend the inclusion floating time, absorption simultaneously is mingled with, cleaning molten steel.
3, when the low liquid level of cast tundish in latter stage is poured into a mould; owing to its flow control effect is possible to prevent coverture to be involved in molten steel; realize the continuous cast in the constant situation of pulling rate in certain limit, improve molten steel recovery rate, and reduce the impact on continuous casting billet quality such as covering slag slag that pulling rate change causes.In whole casting process, molten steel is purified further, decreases tundish upper nozzle and the raw probability of submersed nozzle wadding miscarriage, produces direct motion for stabilizing continuous casting base quality and guarantee and provide a feasible technological approaches.
Accompanying drawing explanation
Fig. 1 is that flow control device uses view；
Fig. 2 is flow control device Section A-A figure.
In figure: tundish 1, flow control device 2, flow control hole 3, thin outer crust 4, filling pipe end 5.
Detailed description of the invention
A device for controlling flow of ladle 2 generally hollow columnar structured, cylinder closedtop closes, and cylinder degree is 350～450mm, and cylinder top and sidewall thickness are 8～10mm, and barrel bore is 4～8 times of tundish upper nozzle internal diameter, and cylinder top and sidewall are aluminum zirconium carbonaceous material.4 row's flow control holes 3 equidistantly it are provided with along cylinder inner wall tangent to periphery direction, flow control hole 3 first row is from cylinder end face 100mm, the 4th array pitch cylinder bottom surface 50mm, the cross sectional shape in flow control hole 3 is circular, and flow control hole 3 gross area is 10 times of tundish 1 filling pipe end 5 inner chamber cross sectional area.It is the thin outer crust 4 that 3mm steel plate processes that cylinder outer wall is enclosed with a layer thickness.
The cylinder axis of flow control device 2 and filling pipe end 5 centrage being aligned is buckled in above filling pipe end 5, the pouring molten steel initial stage, and under the parcel of thin outer crust 4, the large inclusions in molten steel is blocked in and cannot be directly entered crystallizer outside flow control device 2；Produce the dynamic conditions of eddy current simultaneously when eliminating the cast of low liquid level above filling pipe end 5, make coverture also cannot be involved in molten steel.After the molten steel injecting tundish 1 reach a certain height, along with flow control device 2 thin outer crust 4 is progressively melted, molten steel enters flow control device 2 by flow control hole 3, the tangential molten steel entered will form eddy flow in flow control device 2, making molten steel time of staying in tundish 1 increase, field trash is floated further, and the hole wall absorption of the controlled discharge orifice 3 of part field trash in molten steel, thus inhibiting filling pipe end 5 wadding stream and the formation of soaking water gap wadding stream, steel is made to be purified.With the cast initial stage, there is identical principle and effect during low liquid level cast in cast latter stage.
The major parameter of table 1 embodiment flow control device
| Cylinder heights mm | Wall thickness of cylinder mm | Thin outer crust thickness mm | Flow control hole shape | |
| Embodiment 1 | 350 | 8 | 3 | Circular |
| Embodiment 2 | 450 | 10 | 3 | Circular |
The continuous casting billet cleanliness factor index of relative analysis conventional method and the inventive method: materialsed as opening the head base (unstable state) and stable state base watering latter 2 meters: the T.O (ppm) of head base detection cast tri-positions of 0.5m, 1.0m, 2m and Large Inclusions (more than 50 μm) number binomial index, continuous casting billet sampling is representative.The field trash detection sample gross area is 9000mm2, embodiment and comparative example result are in Table 1.The detection of stable state base selects the 2nd tank steel the 2nd, 3 pieces and the 2nd block of continuous casting billet of the 3rd tank steel, analyze T.O (ppm) and Large Inclusions (more than 50 μm) number binomial index equally, continuous casting billet sampling is representative, and inclusion analysis area of detection is 5000mm2, embodiment and comparative example result are in Table 3.
2 meters of head base cleanliness factor contrasts poured into a mould by table 2
Table 3 stable state continuous casting billet cleanliness factor contrasts
Comparing with conventional method, adopt the continuous casting billet T.O content that the inventive method produces to reduce, Large Inclusions quantity reduces, and steel cleanliness factor significantly improves.
Claims (7)
1. a device for controlling flow of ladle, it is characterised in that described flow control device is the columnar structured of hollow, cylinder top face closure, is equidistantly provided with at least 2 row flow control holes along cylinder inner wall tangent to periphery direction, and cylinder outer wall is enclosed with one layer of thin outer crust.
2. device for controlling flow of ladle according to claim 1, it is characterised in that the cylinder heights of described flow control device is 300～500mm, and the thickness of cylinder end face and sidewall is 7～15mm, the internal diameter of cylinder is 4～8 times of tundish upper nozzle internal diameter.
3. device for controlling flow of ladle according to claim 1, it is characterised in that the cross sectional shape in described flow control hole is circular, quincunx or rhombus, the flow control hole gross area is 5～10 times of tundish upper nozzle inner chamber cross sectional area.
4. device for controlling flow of ladle according to claim 1, it is characterised in that described flow control hole is arranged on from cylinder below end face 100mm, cylinder bottom surface 50mm range above.
5. device for controlling flow of ladle according to claim 1, it is characterised in that described thin outer crust adopts thickness to be that 1～5mm steel plate processes.
6. device for controlling flow of ladle according to claim 1, it is characterised in that described cylinder end face and sidewall material are aluminum zirconium carbonaceous material.
7. the method applying device for controlling flow of ladle described in claim 1, it is characterised in that:
After the cylinder axis of flow control device and tundish upper nozzle centrage being aligned, button is placed on above tundish upper nozzle, can carry out pouring molten steel；At the pouring molten steel initial stage, under the parcel of thin outer crust, the large inclusions in molten steel is blocked in and cannot be directly entered crystallizer outside flow control device；Produce the dynamic conditions of eddy current simultaneously when eliminating the cast of low liquid level above filling pipe end, make coverture also cannot be involved in molten steel；After the molten steel injecting tundish reach a certain height, along with flow control device thin outer crust is progressively melted, molten steel enters flow control device by flow control hole, the tangential molten steel entered will form eddy flow in flow control device, making molten steel time of staying in tundish increase, field trash is floated further, and part field trash controlled flow hole wall absorption in molten steel, thus inhibiting tundish upper nozzle wadding stream and the formation of soaking water gap wadding stream, steel is made to be purified；With the cast initial stage, there is identical principle and effect during low liquid level cast in cast latter stage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410734565.2A CN105710357A (en) | 2014-12-01 | 2014-12-01 | Tundish flow control device and method |
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| CN201410734565.2A CN105710357A (en) | 2014-12-01 | 2014-12-01 | Tundish flow control device and method |
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| CN105710357A true CN105710357A (en) | 2016-06-29 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812929A (en) * | 2017-11-06 | 2018-03-20 | 重庆大学 | A kind of tundish and its turbulence inhibitor |
| CN107983944A (en) * | 2018-01-13 | 2018-05-04 | 山东钢铁股份有限公司 | The method and device of molten steel casting surplus is reduced in a kind of casting process |
| CN108247033A (en) * | 2018-01-17 | 2018-07-06 | 武汉科技大学 | A kind of continuous casting production eddy flow filling pipe end |
| CN108393479A (en) * | 2018-04-18 | 2018-08-14 | 宜兴市龙宸炉料有限公司 | A kind of middle water containing opening brick cup extending filling pipe end service life |
| CN111136255A (en) * | 2020-01-20 | 2020-05-12 | 武汉科技大学 | Flow control structure for inhibiting tundish slag from being discharged |
| CN117000955A (en) * | 2023-09-28 | 2023-11-07 | 鄂尔多斯应用技术学院 | Magnesium-matched metallurgical device for rare earth magnesium-based hydrogen storage alloy tundish |
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| JPS632540A (en) * | 1986-06-23 | 1988-01-07 | Nippon Kokan Kk <Nkk> | Molten metal vessel having molten metal flowing hole |
| JPS6343752A (en) * | 1986-08-08 | 1988-02-24 | Nippon Kokan Kk <Nkk> | Molten metal vessel providing weir |
| US4770395A (en) * | 1987-06-16 | 1988-09-13 | Sidbec Dosco Inc. | Tundish |
| CN2799124Y (en) * | 2005-06-10 | 2006-07-26 | 鞍钢集团新钢铁有限责任公司 | Flow control device for medium thin slab continuous casting tundish |
| CN202701326U (en) * | 2012-04-24 | 2013-01-30 | 河北钢铁股份有限公司承德分公司 | An improved tundish and improved flow stabilizers for a billet caster |
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2014
- 2014-12-01 CN CN201410734565.2A patent/CN105710357A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632540A (en) * | 1986-06-23 | 1988-01-07 | Nippon Kokan Kk <Nkk> | Molten metal vessel having molten metal flowing hole |
| JPS6343752A (en) * | 1986-08-08 | 1988-02-24 | Nippon Kokan Kk <Nkk> | Molten metal vessel providing weir |
| US4770395A (en) * | 1987-06-16 | 1988-09-13 | Sidbec Dosco Inc. | Tundish |
| CN2799124Y (en) * | 2005-06-10 | 2006-07-26 | 鞍钢集团新钢铁有限责任公司 | Flow control device for medium thin slab continuous casting tundish |
| CN202701326U (en) * | 2012-04-24 | 2013-01-30 | 河北钢铁股份有限公司承德分公司 | An improved tundish and improved flow stabilizers for a billet caster |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107812929A (en) * | 2017-11-06 | 2018-03-20 | 重庆大学 | A kind of tundish and its turbulence inhibitor |
| CN107983944A (en) * | 2018-01-13 | 2018-05-04 | 山东钢铁股份有限公司 | The method and device of molten steel casting surplus is reduced in a kind of casting process |
| CN108247033A (en) * | 2018-01-17 | 2018-07-06 | 武汉科技大学 | A kind of continuous casting production eddy flow filling pipe end |
| CN108247033B (en) * | 2018-01-17 | 2020-07-21 | 武汉科技大学 | Rotational flow water feeding port for continuous casting tundish |
| CN108393479A (en) * | 2018-04-18 | 2018-08-14 | 宜兴市龙宸炉料有限公司 | A kind of middle water containing opening brick cup extending filling pipe end service life |
| CN111136255A (en) * | 2020-01-20 | 2020-05-12 | 武汉科技大学 | Flow control structure for inhibiting tundish slag from being discharged |
| CN117000955A (en) * | 2023-09-28 | 2023-11-07 | 鄂尔多斯应用技术学院 | Magnesium-matched metallurgical device for rare earth magnesium-based hydrogen storage alloy tundish |
| CN117000955B (en) * | 2023-09-28 | 2023-12-08 | 鄂尔多斯应用技术学院 | Magnesium-matched metallurgical device for rare earth magnesium-based hydrogen storage alloy tundish |
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Application publication date: 20160629 |