CN101596586A - Vacuum-negative pressure continuous casting method - Google Patents
Vacuum-negative pressure continuous casting method Download PDFInfo
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- CN101596586A CN101596586A CNA2009100032980A CN200910003298A CN101596586A CN 101596586 A CN101596586 A CN 101596586A CN A2009100032980 A CNA2009100032980 A CN A2009100032980A CN 200910003298 A CN200910003298 A CN 200910003298A CN 101596586 A CN101596586 A CN 101596586A
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Abstract
This vacuum-negative pressure continuous casting method is that casting method also is the vacuum outgas method.It comprises that covering slag and upper end cooperate the lower end to immerse the long nozzle of molten steel with seal of vessel; In order to reduce to cast the impulsive force of stream to molten steel in the crystallizer, avoid water blocking mouthh and go out the bad waste product of deoxidation, make the degassing stop to organize and coordinate with speed in the same time and place with continuous casting and wait difficulty, the present invention outgases molten steel by bottom tundish pipeline being set in long nozzle.Though the present invention is very simple, less investment has solved above-mentioned problems, and the continuous casting direct motion reduces deoxidier and alloy material consumption, improves slab quality and performance, and temperature adjustment within the specific limits easily.
Description
This vacuum-negative pressure continuous casting method belongs to casting method, is again a kind of vacuum outgas method simultaneously.
In casting process; for preventing the molten steel secondary oxidation; wrap greatly to Zhong Bao and in wrap to adopting both at home and abroad extensively big bag long nozzle and crystallizer submersed nozzle mating protection flux shielding casting between crystallizer; big bag long nozzle connect meet blowing argon; and developed with sealant replacement blowing argon, but these all can not solve following four major issues that continuous casting process exists.
1. to flow into the driving force of crystallizer big for molten steel, causes in the crystallizer molten steel turbulent flow serious, liquid fluctuating, and the liquid cave is dark, and slab quality defective even bleed-out appear in gas and be mingled with and can not float.
2. produce mild steel final deoxidizing aluminium and add and lacked strand and a large amount of multiple waste products will occur, when especially producing low-carbon low-silicon steel even the phenomenon that molten steel seethes with excitement can occur in crystallizer, be forced to stop watering; Aluminium has been added the nozzle clogging obstruction.
3. contain more gas and field trash in the molten steel, make steel produce many disadvantages.
4. watering property of molten steel temperature influence of fluctuations and slab quality.
For solving first problem, the Te Saide of British Steel Corporation [Teesside] steel mill has developed vacuum tundish technology (" the tenth the academic proceeding of whole nation steel-making " the 28th page of 1998.11 Chinese Metals Society's steelmaking theory can be compiled), and the vacuum chamber of sealing is made in the middle water containing opening top.Vacuum chamber is immersed in etch severe contamination molten steel in the molten steel.For solving the 2nd problem, extensively adopt calcium-silicon to substitute part aluminium at present to deoxidation of molten steel.But only equal to improve fluidity molten steel at 0.1%～0.28% o'clock, stop up otherwise aggravate nozzle clogging on the contrary at Ca/Al; And the recovery rate of aluminium and calcium is difficult to control again, even add with the method for line feeding nozzle blocking usually takes place also, is forced to stop production.For solving the 3rd problem, developed many vacuum outgas methods both at home and abroad, what cooperate with continuous casting at present mainly contains DH, RH and ASEA-SKF method.These methods all must be transported to continuous casting again after handle in special-purpose place, investment is big, troublesome poeration, and occupied ground and time, and increased production link, organize and coordinate difficulty.Developed the online steel flow vacuum of continuous casting treating apparatus (" continuous casting steel machine " the 118th page of metallurgical industry publishing house the 1st edition) at Xin Libiecike iron company of the above-mentioned shortcoming former Soviet Union.The vacuum chamber of online processing is placed between ladle and tundish, relies on the hydraulic cylinder control lifting of both sides, and vacuum chamber and ladle are combined, and delivery line is arranged to vacuumize on the vacuum chamber.For solving the 4th problem, Belgian Centre De Recherches Metallurgiques (CRM) has developed water cooling nozzle (" continuous casting steel machine " the 139th page is the same).In this mouth of a river, the tundish molten steel flows along the steel plate of a water-cooled, flows into crystallizer through a pipe of being made by refractory material then, and this technology can only be lowered the temperature.Developed several different methods both at home and abroad for improving liquid steel temperature, physical method is arranged, chemical method is also arranged, cost is all than higher, and chemical method also can pollute molten steel.Obviously, above method is all invested greatly, more complicated.So far the neither one scheme can solve above-mentioned four problems simultaneously both at home and abroad, the objective of the invention is not only to solve steel and flow anti-oxidation problem with a simple method, solves above-mentioned four problems simultaneously.
The object of the present invention is achieved like this: make upper end, the steel stream protection mouth of a river and container fit sealing, the molten steel that is covered with covering slag is immersed in the lower end; The bottom of cubitainer pipeline of installation communicates with air-extractor on this mouth of a river.To vacuumize in the mouth of a river, molten steel enters the back because pressure reduces suddenly, and gas expands and separates out in the steel, and molten steel becomes to drip shape and falls, because of surface area is big especially, thus the degassing efficiency height, so can add aluminium less.Again because vacuum is sucked, and middle water-coating port molten steel flow velocity strengthens, so avoid nozzle clogging to stop up.The molten steel of periphery, the mouth of a river is subjected to the pressure inner vacuum of atmosphere so liquid level rises, and molten steel become to drip a shape and fall, and the driving force that molten steel flows into crystallizer is little, gas and be mingled with easy come-up.Molten steel is lowered the temperature in long nozzle, also can pass through gas heater [5] to mouth of a river insulation or heating, regulates temperature in certain scope.
The present invention just installs a conduit in the bottom of container, and simple, air-extractor is little, and occupied ground is little, equipment and simple to operate, and investment cost is few, and a skill multipotency, efficient and continuous casting carry out with speed in the same time and place.The various vacuum outgas methods that at present domestic and international continuous casting is adopted are not in the last moment of casting molten steel to be outgased, after process in molten steel also can be from absorbing gas on every side, when especially casting, casting stream causes negative pressure to bring gas into foundry goods around it at a high speed, and this method is the last moment before solidification of molten steel, can keep the pure state after molten steel is handled.
Accompanying drawing is embodiments of the invention.[1] is tundish among the figure, and [2] are pump-line, and [6] are crystallizer.Pipeline communicates with the mouth of a river [7] ring pipe on every side under the tundish, the perforate of ring pipe inner arc, the hook of burn-oning on every side and cooperating with submersed nozzle carriage [3], submersed nozzle [4] stick up tightened-up structure (oxygen rifle quick coupling structure) by the extension on the carriage [3] and firmly are fixed on the middle water containing opening below.There is cannelure the submersed nozzle upper surface, filling sealing agent [extension of groove can have ditch] in the groove.[5] be the ring gas heater, make its upper end joint seal, can begin casting immersing mouth of a river preheating.
The inventive method not only can be used for tundish to also can be used between crystallizer wrapping greatly between tundish, can also adopt simultaneously at two places.Visual various objectives during use: for fear of water blocking mouthh, or in order to reduce the beam driving force, still for the molten steel vacuum outgas being handled the vacuum of determining the use location and determining employing according to specific requirement.The vacuum pouring liquid point depth is little, and the conticaster metallurgical length is reduced.
For preventing slag under the continuous casting misoperation, can calculate the height that molten steel rises in submersed nozzle according to the vacuometer of design, boxing out above liquid level communicates with vacuum storage slag device.
The inventive method is not only applicable to the molten steel continuous casting and is applicable to all liq casting.
Claims (1)
1. vacuum-negative pressure continuous casting method belongs to casting method and also belongs to the vacuum outgas method simultaneously, and it comprises that covering slag and upper end cooperate the lower end to immerse the long nozzle of molten steel with seal of vessel, it is characterized in that the immersion long nozzle communicates with air-extractor by the pipeline that is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100032980A CN101596586A (en) | 2009-01-25 | 2009-01-25 | Vacuum-negative pressure continuous casting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100032980A CN101596586A (en) | 2009-01-25 | 2009-01-25 | Vacuum-negative pressure continuous casting method |
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| Publication Number | Publication Date |
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| CN101596586A true CN101596586A (en) | 2009-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009100032980A Pending CN101596586A (en) | 2009-01-25 | 2009-01-25 | Vacuum-negative pressure continuous casting method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170480A (en) * | 2013-03-08 | 2013-06-26 | 马钢(集团)控股有限公司 | Rapid cleaning device for bale long nozzle and cleaning method thereof |
| CN103252485A (en) * | 2013-06-04 | 2013-08-21 | 中冶赛迪工程技术股份有限公司 | Steel ladle and method for using steel ladle to reduce heat absorption in pouring process |
-
2009
- 2009-01-25 CN CNA2009100032980A patent/CN101596586A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103170480A (en) * | 2013-03-08 | 2013-06-26 | 马钢(集团)控股有限公司 | Rapid cleaning device for bale long nozzle and cleaning method thereof |
| CN103252485A (en) * | 2013-06-04 | 2013-08-21 | 中冶赛迪工程技术股份有限公司 | Steel ladle and method for using steel ladle to reduce heat absorption in pouring process |
| CN103252485B (en) * | 2013-06-04 | 2015-02-18 | 中冶赛迪工程技术股份有限公司 | Steel ladle and method for using steel ladle to reduce heat absorption in pouring process |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20091209 |