CN1640579A - Low temperature decrease steel ladle pouring method - Google Patents
Low temperature decrease steel ladle pouring method Download PDFInfo
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- CN1640579A CN1640579A CN 200410000096 CN200410000096A CN1640579A CN 1640579 A CN1640579 A CN 1640579A CN 200410000096 CN200410000096 CN 200410000096 CN 200410000096 A CN200410000096 A CN 200410000096A CN 1640579 A CN1640579 A CN 1640579A
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- ladle
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Abstract
The present invention relates to a two temperature drop ladle pouring method. It is characterized by that in the ladel pouring process said invention utilizes gas to heat molten steel by means of high-effective nozzle mounted on the ladel cover, and utilizes bottom blowing argon to stir the molten steel. Said method can stabilize pouring basket temperature and can implement stable low overheat molten steel pouring operation.
Description
Affiliated field:
The present invention relates to a kind of low temperature drop steel ladle pouring method, mainly be applicable to the metallurgy industry steel mill.
Background technology:
Nowadays most of smelter has been realized sequence casting, and in the conticaster steel pouring process, the time that molten steel stops in ladle is longer, and the molten steel in the casting process ladle and the temperature drop of ladle itself are bigger.And continuous casting process itself requires liquid steel temperature stable, and the middle Baogang water degree of superheat is stable, has only the degree of superheat of molten steel stable, casting machine operation successfully.
The big bag of continuous casting waters the steel time and is generally more than 30 minutes, and the difference of the one heat steel the highest degree of superheat and minimum degree of superheat in casting process is generally at the 6-13 degree, and promptly the temperature drop of molten steel is the 6-13 degree, causes ladle degree of superheat instability.Because the tundish molten steel overheat exists than big difference, in order to guarantee carrying out smoothly of continuous casting, the degree of superheat of molten steel is generally higher, more than 30 degree, will inevitably aggravate the degree of center porosity and segregation like this, make strand internal flaw aggravation, bigger to the homogeney influence of the quality of strand and steel, particularly the influence to medium and high carbon steel is bigger; On the other hand, because the cast temperature drop is big, the middle and later periods molten steel temperature that often causes casting machine to pour into a mould is low freezes stream, influences ordinary production.
The present general method of adding a cover that only adopts of the ladle heat insulation of continuous-casting steel pouring process after promptly ladle is sat turntable, adds an insulation cover that is embedded with anti-material in that ladle is suitable for reading, to reduce the thermal loss of molten steel.The main deficiency of this method is, itself does not have thermal source insulation cover, does not possess heating function, and heat insulation effect is limited.Another ladle heat insulation technology is to utilize plasma that molten steel is heated, though possess heating function, the equipment complexity, maintenance workload is big, equipment investment and cost of use height, the environmental suitability of equipment is relatively poor.
Summary of the invention:
The objective of the invention is major defect at conticaster technological requirement and continuous casting billet existence at present, we have designed a kind of ladle heat insulation device and low temperature drop steel ladle pouring method, steel pouring process utilizes combustion gas to molten steel and ladle heating in the portion of wrapping greatly, utilizes BOTTOM ARGON BLOWING to realize the function of purify hot metal and uniform temperature.After this method is implemented, can be at the casting machine steel pouring process to molten steel in the ladle and cylinder-packing heat tracing, reduce molten steel temperature drop and ladle temperature drop in the steel pouring process, the front and back phase degree of superheat that realizes the cast of one heat steel water is stable, reach low temperature drop, low overheat waters the purpose of steel, alleviate that strand is loose, the degree of shrinkage cavity and component segregation, it is ubiquitous because of tundish molten steel overheat height to solve present exploitation continuous casting medium high carbon variety steel to a great extent, the steel performance decline problem that the center porosity segregation causes.
Another object of the present invention is to alleviate ladle steel bonding dry slag problem, and the main cause of ladle steel bonding dry slag is that the cylinder-packing temperature is low, ladle in use, molten steel and molten state slag cause in the cylinder-packing surface condensation.Ladle temperature in use has several different stages: after the hot repair to converter tapping be the cylinder-packing temperature-fall period, do not have online roasting bag, tapping finish to ladle seat turntable be the cylinder-packing temperature rise period, begin to be poured into molten steel and water to finish and be the cylinder-packing temperature-fall period.Molten steel waters to finish and hangs down turntable, turns over the slag process, because the cylinder-packing temperature is low, remaining molten steel and slag are bonded at the cylinder-packing surface.Cylinder-packing temperature when using this method and can improve ladle and turn over slag reduces the condense degree of remaining molten steel slag on the cylinder-packing surface, reduces the ladle band quantity of slag, improves the ladle clean level, improves ladle turnover temperature.The BOTTOM ARGON BLOWING function of this method can be accelerated floating foreign in the molten steel, improves the molten steel cleanliness factor, for the cleaner variety steel of exploitation provides good condition.
The present invention relates to a kind of low temperature drop steel ladle pouring method, it is characterized in that: utilize combustion gas molten steel to be heated in the steel ladle pouring process by the efficient burner that is installed in ladle and covers; And in the steel ladle pouring process, utilize BOTTOM ARGON BLOWING that molten steel is stirred.
In the steel ladle pouring process, the tundish thermometric was adjusted the efficiency of heating surface according to tundish molten steel overheat condition in every 5-10 minute; Molten steel overheat is being used high-power heating below 20 ℃, molten steel overheat is used the small-power heat tracing at 20-25 ℃, and molten steel overheat surpasses 25 ℃ and stops heating, and the degree of superheat of control tundish molten steel is at zone of reasonableness.
In heating process, open combustion gas earlier, open combustion air again; Ladle opens that to water in the ladle in early stage headroom less, and burner and liquid level distance is little, and thermal efficiency height and is poured into a mould the later stage ratio, and square one will reduce efficiency of heating surface 30-50%; Along with constantly carrying out of cast, headroom becomes big in the ladle, adjusts combustion gas and combustion air, heats with high-power gradually, guarantees to add thermal effect.
The invention has the beneficial effects as follows:
1, stablizes the middle bag temperature of steel pouring process, the highest minimum temperature difference of middle bag reduces about 30%, normal condition, temperature drop is reduced in 9 degree from 13 original degree, even it is lower, realize that stable low overheat waters steel, overcome the defectives such as loose segregation that continuous casting billet causes because of degree of superheat shakiness to a great extent.
2, improve the turnover temperature of ladle cleanliness factor and cylinder-packing.
(1) improve dump rate, hang down the ladle dry slag that causes because of cylinder-packing temperature when effectively suppressing to turn over slag, make ladle inside cleaner.
(2) improve red packet tapping rate, reduce system temperature, reduce ladle rapid heat cycle degree, improve ladle life, reduce refractory consumption rate.
3, improve the security of even watering.Adopt that the bag temperature drop obviously reduces in the big bag cast of low temperature drop, can make the pouring molten steel on the low side of temperature after the part refining treatment more smooth, melt down with casting machine is disconnected and water thereby reduce low temperature.
4, prolong argon blowing time, inclusion floating is abundant, pure molten steel.
5, system temperature reduces about 5 degree, reduces refractory consumption.
Description of drawings:
Fig. 1 is the low temperature drop cast of ladle schematic diagram
1 efficient burner 2 insulation covers 3 ladles, 4 mouths of a river, 5 tunger tubes, 6 bottom blowing bricks
7 air feed pipes, 8 Gas Pipe
The specific embodiment:
Below in conjunction with accompanying drawing this invention is further described
1, cantilever being installed hangs
Cantilever is installed near the continuous casting steel ladle rotary table is hung, the effect that cantilever hangs is the clad of handling band burner.When cantilever is sling a high position, guarantee clad and be sitting in ladle upper edge on the casting machine turntable high position free space of 500mm is arranged that after cantilever hung reduction, clad can cover on ladle.
2, make the heating clad
Heating is installed in the center of clad with burner, adopts efficient burner, improves the efficiency of heating surface of flame, and the molten steel after guaranteeing liquid level reduced effectively heats, and fuel burner nozzle is surveyed blowing-in and combustion-supporting outward, improves the thermal efficiency.The anti-material of clad liner embedding lightweight under the situation that guarantees heat insulation effect, alleviates clad weight.The downward shirt rim of weldering system around the clad, high 200mm improves heat insulation effect.Four sling points of symmetry are installed on clad top, and sling point is in the center of clad radius.Clad all is connected with metal hose with combustion-aid air pipe with the right tracheae of fixed-piping, guarantees that clad with the ladle automatic lifting, satisfies the continuous casting process requirement.
3, bottom blowing Unit Installation
Draw an Argon arm in the ladle side that possesses the bottom blowing function, the Argon arm communicates with the bottom blowing brick, and the ladle that does not possess the bottom blowing function is installed bottom-blown air brick earlier, adopts the snap joint metal hose to link to each other with the argon gas source of the gas.Carry out bottom blowing when molten steel is heated, the bottom blowing flow is unsuitable excessive, and molten steel springs up, and the top of the slag does not reveal molten steel and is advisable.
4, Jia Re control
Gas pipeline is installed self-regulating flow valve, and the blower fan of combustion air drives with variable-frequency motor, in time adjusts heating power according to the overheat condition of tundish molten steel, guarantees that the tundish degree of superheat is controlled at zone of reasonableness.
5, realization of the present invention
The present invention waters the steel position at the big bag of continuous casting the ladle lid 2 be furnished with efficient burner 1 is installed, and ladle lid 2 closely contacts with ladle 3, and steel pouring process can be with the ladle synchronization lifting.Steel pouring process heats molten steel with coal gas 8 or other combustion gas, utilizes steel ladle bottom argon blowing 6 even liquid steel temperatures simultaneously.The molten steel heat is to scatter and disappear from the top of ladle more than 70% in the ladle, and the ladle mouth adds builds insulation effect, reduces the thermal loss of molten steel.The efficient burner at ladle lid center plays heat effect, utilizes the heat of fuel gas buring that molten steel is heated, and replenishes the thermal loss of molten steel.BOTTOM ARGON BLOWING has stirred the effect of even liquid steel temperature, has the effect of purify hot metal simultaneously concurrently, specifically as shown in drawings.
6, operating procedure
(1) after ladle seat turntable and the middle bag contraposition, start cantilever and hang, will be with the clad of burner to cover on ladle, the cantilever suspension hook drops to low level, guarantees that clad is with the ladle free lifting.
(2) in the steel ladle pouring process, the tundish thermometric was preferably adopted continuous temperature measurement in every 5-10 minute.Adjust the efficiency of heating surface according to tundish molten steel overheat condition; Molten steel overheat is being used high-power heating below 20 ℃, molten steel overheat is used the small-power heat tracing at 20-25 ℃, and molten steel overheat surpasses 25 ℃ and stops heating, and the degree of superheat of control tundish molten steel is at zone of reasonableness.
(3) open combustion gas earlier, open combustion air again; Ladle opens that to water in the ladle in early stage headroom less, and burner and liquid level distance is little, and thermal efficiency height and is poured into a mould the later stage ratio, and square one will reduce heating power 30-50%; Along with constantly carrying out of cast, headroom becomes big in the ladle, adjusts combustion gas and combustion air, heats with high-power gradually, guarantees to add thermal effect.
(4) 80 tons of ladles utilize coke-stove gas to heat, and gas consumption is 400m during high power
3/ h, combustion air consumption is 1800m
3/ h, middle low-power is cut down according to the circumstance.
Claims (3)
1, a kind of low temperature drop steel ladle pouring method is characterized in that: utilize combustion gas by the efficient burner that is installed in ladle and covers molten steel to be heated in the steel ladle pouring process; And in the steel ladle pouring process, utilize BOTTOM ARGON BLOWING that molten steel is stirred.
2, a kind of low temperature drop steel ladle pouring method as claimed in claim 1 is characterized in that: in the steel ladle pouring process, the tundish thermometric was adjusted the efficiency of heating surface according to tundish molten steel overheat condition in every 5-10 minute; Molten steel overheat is being used high-power heating below 20 ℃, molten steel overheat is used the small-power heat tracing at 20-25 ℃, and molten steel overheat surpasses 25 ℃ and stops heating, and the degree of superheat of control tundish molten steel is at zone of reasonableness.
3, a kind of low temperature drop steel ladle pouring method as claimed in claim 1 is characterized in that: in heating process, open combustion gas earlier, open combustion air again; Ladle opens that to water in the ladle in early stage headroom less, and burner and liquid level distance is little, and thermal efficiency height and is poured into a mould the later stage ratio, and square one will reduce efficiency of heating surface 30-50%; Along with constantly carrying out of cast, headroom becomes big in the ladle, adjusts combustion gas and combustion air, heats with high-power gradually, guarantees to add thermal effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410000096 CN1640579A (en) | 2004-01-14 | 2004-01-14 | Low temperature decrease steel ladle pouring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410000096 CN1640579A (en) | 2004-01-14 | 2004-01-14 | Low temperature decrease steel ladle pouring method |
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| CN1640579A true CN1640579A (en) | 2005-07-20 |
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| CN 200410000096 Pending CN1640579A (en) | 2004-01-14 | 2004-01-14 | Low temperature decrease steel ladle pouring method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831523A (en) * | 2009-03-09 | 2010-09-15 | 鞍钢股份有限公司 | Molten steel dephosphorization device outside furnace and dephosphorization method thereof |
| CN101912961A (en) * | 2010-05-20 | 2010-12-15 | 中核苏阀横店机械有限公司 | Stopper ladle |
| CN101954477A (en) * | 2010-11-09 | 2011-01-26 | 广东省韶铸集团有限公司 | Method for improving pouring port alignment accuracy of bottom pouring boiler |
| CN105121065A (en) * | 2013-02-19 | 2015-12-02 | Abb技术有限公司 | Method, controller and tundish control system for a continuous casting process |
| CN105170963A (en) * | 2015-09-16 | 2015-12-23 | 安徽永茂泰汽车零部件有限公司 | Automatic-discharging-type molten aluminum transferring conveyor |
| CN105195725A (en) * | 2015-09-16 | 2015-12-30 | 安徽永茂泰汽车零部件有限公司 | Mobile type aluminum liquid transferring transportation machine |
| CN108620544A (en) * | 2018-06-04 | 2018-10-09 | 东北大学 | A kind of casting process control stuffing sand enters the method for tundish |
| CN110076330A (en) * | 2019-04-28 | 2019-08-02 | 北京首钢股份有限公司 | A method of improving ladle cleanliness with cover |
| CN115138812A (en) * | 2022-07-05 | 2022-10-04 | 上海大学 | Method and device for improving quality of casting blank |
-
2004
- 2004-01-14 CN CN 200410000096 patent/CN1640579A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101831523A (en) * | 2009-03-09 | 2010-09-15 | 鞍钢股份有限公司 | Molten steel dephosphorization device outside furnace and dephosphorization method thereof |
| CN101831523B (en) * | 2009-03-09 | 2013-05-29 | 鞍钢股份有限公司 | Molten steel dephosphorization outside furnace method |
| CN101912961A (en) * | 2010-05-20 | 2010-12-15 | 中核苏阀横店机械有限公司 | Stopper ladle |
| CN101954477A (en) * | 2010-11-09 | 2011-01-26 | 广东省韶铸集团有限公司 | Method for improving pouring port alignment accuracy of bottom pouring boiler |
| CN105121065A (en) * | 2013-02-19 | 2015-12-02 | Abb技术有限公司 | Method, controller and tundish control system for a continuous casting process |
| CN105170963A (en) * | 2015-09-16 | 2015-12-23 | 安徽永茂泰汽车零部件有限公司 | Automatic-discharging-type molten aluminum transferring conveyor |
| CN105195725A (en) * | 2015-09-16 | 2015-12-30 | 安徽永茂泰汽车零部件有限公司 | Mobile type aluminum liquid transferring transportation machine |
| CN108620544A (en) * | 2018-06-04 | 2018-10-09 | 东北大学 | A kind of casting process control stuffing sand enters the method for tundish |
| CN110076330A (en) * | 2019-04-28 | 2019-08-02 | 北京首钢股份有限公司 | A method of improving ladle cleanliness with cover |
| CN110076330B (en) * | 2019-04-28 | 2021-06-22 | 北京首钢股份有限公司 | Method for improving cleanliness of steel ladle with cover |
| CN115138812A (en) * | 2022-07-05 | 2022-10-04 | 上海大学 | Method and device for improving quality of casting blank |
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| WD01 | Invention patent application deemed withdrawn after publication |