CN103464732A - Method for capturing and absorbing suspending impurities in tundish - Google Patents
Method for capturing and absorbing suspending impurities in tundish Download PDFInfo
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- CN103464732A CN103464732A CN2013103862960A CN201310386296A CN103464732A CN 103464732 A CN103464732 A CN 103464732A CN 2013103862960 A CN2013103862960 A CN 2013103862960A CN 201310386296 A CN201310386296 A CN 201310386296A CN 103464732 A CN103464732 A CN 103464732A
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Abstract
The invention relates to the field of continuous casting of slabs, in particular to a method for capturing and absorbing suspending impurities in a tundish. The method is characterized in that a dike building plate containing CaCO3 is arranged at the bottom of the tundish, a nucleation center and bubble power are self-generated in the process of pouring by utilizing heat burst characteristics of the CaCO3 material, and oxides in the continuously-cast tundish are captured and removed to enter furnace slag. The method specifically includes that 1), the dike building plate is built on one side of a tundish dike at the bottom of the tundish; 2), in the process of pouring, CaCO3 particles burst and decompose layer by layer, generated CO2 and CaO particles enter molten steel, slag washing is performed on the molten steel flowing through above, a protection atmosphere is formed, the CaO particles are combined with aluminum impurities, and the objective of purifying the molten steel is achieved. Compared with the prior art, the method has the advantages that tiny bubbles formed by CO2 generated during bursting of CaCO3 float upwards and expand, and capturing of aluminum-oxygen impurities is realized.
Description
Technical field
The present invention relates to low sial flat cold-rolled sheet sheet billet continuous casting field, relate in particular to a kind of tundish suspension and be mingled with the method that trapping absorbs.
Background technology
In the continuous casting of low sial flat cold-rolled sheet steel is produced, tundish is the intermediate receptacle that connects ladle and continuous cast mold in steel pouring process.After molten steel enters tundish, because the inner chamber of tundish is opened before watering and has been full of air, it is strong oxidizing atmosphere, molten steel contacts with air oxidation occurs in being full of the process of tundish, in wrapping in continuous casting due to this field trash, the time of staying is long, and then form a large amount of baroque aluminum oxides and be mingled with, this inclusion size is tiny, nucleating center need to be arranged, and the nucleating center that is difficult to produce certain size in molten steel, therefore open and water rear complex aluminium oxide inclusions and constantly stick to stopper and mouth of a river inwall, with steel, flow in the crystallizer of tundish below, this is to cause continuous casting to open water rear the first bad problem of block casting base quality or even open the key factor of watering the bleed-out production accident.Tundish protection cast is the important content of Technology of Tundish Metallurgy, be generally adopt be filled with inert gas (argon gas) form small bubble float be mingled with and protect in the middle of unwrap and water front inert atmosphere, with this isolated air.This scheme need to be transformed tundish and make ventilated element, and cost is high, larger to the scrap build scope.
Summary of the invention
The purpose of this invention is to provide a kind of tundish suspension and be mingled with the method that trapping absorbs, the gathering center of field trash is set in tundish, and make field trash obtain the power of floating, the trapping of realization to the field trash in the continuous casting tundish, and then the removal that realizes hanging down the sial inclusion content in melting steel, reduce aluminum oxide molten steel is polluted.
For achieving the above object, the present invention adopts following technical scheme to realize:
A kind of tundish suspends and is mingled with the method that trapping absorbs, and in the tundish bottom, arranges containing CaCO
3the burrock of composition is constructed plate, utilizes CaCO
3the thermal spalling characteristic of composition automatically generates nucleating center and bubble power in casting process, and continuous casting tundish inner oxide is trapped and removal enters slag, and its concrete operation step is as follows:
1) being positioned at stopper one side on the side of the tundish burrock of tundish bottom builds burrock by laying bricks or stones and constructs plate, burrock is constructed plate and is of a size of wide 100～150mm, long 1200～1300mm, it is not highly higher than the tundish burrock, lime stone ratio during its raw material forms is no less than 30%, in raw material, limestone granularity is 8～12mm, construct rear health and need to toast drying after 24 hours, baking temperature is 120～130 ℃, and baking time is no less than 24 hours;
While 2) pouring into a mould, burrock is constructed the continuous decomposition and consumption of plate, and its resolving time is no less than 15 minutes, the CO of generation 0.2～0.5NL per minute in decomposable process
2gas, should guarantee to open the tundish liquid level that waters early stage and be no less than 500mm in casting process, the residence time of molten steel in tundish is no less than 3.4 minutes, by molten steel, burrock constructed to washing away and high temperature erosion effect, CaCO of plate
3successively explosion of particle is decomposed, and produces CO
2gas and CaO particle enter in molten steel, and the molten steel of being flowed through in its top carries out the wash heat process, spontaneous inert gas CO in casting process
2by the tundish lumen loading, form the protective atmosphere of molten steel in tundish, the CaO particle of explosion forms field trash and assembles center, and combines with field trash, thereby gets rid of the alumina product in molten steel, reaches the purpose of purify hot metal.
Construct the intensity of plate in order to improve burrock, avoid being burst fast by molten steel, construct outer being arranged with of plate at described burrock and use the stiffened shell made from tundish burrock same material, the thickness of stiffened shell is 10～20mm.
Compared with prior art, the invention has the beneficial effects as follows: 1) realize opening the weak oxide atmosphere operating mode in bag in the process of watering.2) open the process of watering Metal in Tundish is realized to the wash heat effect.3) CaCO
3the CO that explosion produces
2the micro-bubble formed floating expand, and form the trapping to alumina field trash in low sial molten steel, reduce molten steel and pollute.The method of 4) constructing the burrock plate can not produce external foreign matter, stops up steel stream.
The accompanying drawing explanation
Fig. 1 is the relative position schematic diagram that in the invention process example, burrock is constructed plate and tundish burrock.
In figure: 1-tundish 2-tundish burrock 3-burrock is constructed plate 4-stopper
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention one step is illustrated:
A kind of tundish suspends and is mingled with the method that trapping absorbs, and with 30 tons of tundish, the low sial flat cold-rolled sheet of steel grade SPHC class is example, in the tundish bottom, arranges containing CaCO
3the burrock of composition is constructed plate, utilizes CaCO
3material thermal spalling characteristic, self-generating nucleating center and bubble power in casting process, trapped and removal enters slag continuous casting tundish inner oxide, and its concrete operation step is as follows:
1) see Fig. 1, be positioned at stopper 4 one sides builds burrock by laying bricks or stones and constructs plate 3 on the side of the tundish burrock 2 of tundish 1 bottom, burrock is constructed plate 3 and is of a size of wide 150mm, long 750mm, its height is contour with the tundish burrock, lime stone ratio during the raw material that burrock is constructed plate 3 forms is 30%, in raw material, limestone granularity is 8～12mm, burrock is constructed outer being arranged with of plate 3 and is used the stiffened shell made from tundish burrock same material, the thickness of stiffened shell is 10mm, constructing rear health toasts dry after 24 hours, 120 ℃ of baking temperatures, baking time 24 hours;
While 2) pouring into a mould, burrock is constructed the continuous decomposition and consumption of plate, and its resolving time is no less than 15 minutes, the CO of generation 0.2～0.5NL per minute in decomposable process
2gas, should guarantee to open the tundish liquid level that waters early stage and be no less than 500mm in casting process, the residence time of molten steel in tundish is no less than 3.4 minutes, thereby realize getting rid of the alumina product in molten steel, reaches the purpose of purify hot metal.Before and after processing, total oxygen value on average reduces by 32%, Als loss minimizing in 60ppm.
Claims (2)
1. a tundish suspends and is mingled with the method that trapping absorbs, and it is characterized in that, in the tundish bottom, arranges containing CaCO
3the burrock of composition is constructed plate, utilizes CaCO
3the thermal spalling characteristic of composition automatically generates nucleating center and bubble power in casting process, and continuous casting tundish inner oxide is trapped and removal enters slag, and its concrete operation step is as follows:
1) being positioned at stopper one side on the side of the tundish burrock of tundish bottom builds burrock by laying bricks or stones and constructs plate, burrock is constructed plate and is of a size of wide 100～150mm, long 1200～1300mm, it is not highly higher than the tundish burrock, lime stone ratio during its raw material forms is no less than 30%, in raw material, limestone granularity is 8～12mm, construct rear health and need to toast drying after 24 hours, baking temperature is 120～130 ℃, and baking time is no less than 24 hours;
While 2) pouring into a mould, burrock is constructed the continuous decomposition and consumption of plate, and its resolving time is no less than 15 minutes, the CO of generation 0.2～0.5NL per minute in decomposable process
2gas, should guarantee to open the tundish liquid level that waters early stage and be no less than 500mm in casting process, the residence time of molten steel in tundish is no less than 3.4 minutes.
2. a kind of tundish according to claim 1 suspends and is mingled with the method that trapping absorbs, and it is characterized in that, described burrock is constructed outer being arranged with of plate and used the stiffened shell made from tundish burrock same material, and the thickness of stiffened shell is 10～20mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013103862960A CN103464732A (en) | 2013-08-29 | 2013-08-29 | Method for capturing and absorbing suspending impurities in tundish |
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| CN2013103862960A CN103464732A (en) | 2013-08-29 | 2013-08-29 | Method for capturing and absorbing suspending impurities in tundish |
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| CN2013103862960A Pending CN103464732A (en) | 2013-08-29 | 2013-08-29 | Method for capturing and absorbing suspending impurities in tundish |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299535A (en) * | 2020-04-17 | 2020-06-19 | 攀钢集团攀枝花钢钒有限公司 | Quality control method for head covering blank in slab continuous casting |
| CN113828742A (en) * | 2020-06-23 | 2021-12-24 | 宝山钢铁股份有限公司 | Covering agent for preventing slag entrapment in pouring area of tundish and application |
| CN114921611A (en) * | 2022-05-23 | 2022-08-19 | 辽宁北祥重工机械制造有限公司 | Process method for producing large-scale high-quality alloy structural steel and high-quality carbon structural steel ingots |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995006534A1 (en) * | 1993-08-28 | 1995-03-09 | Foseco International Limited | Purifying molten metal |
| JP2005349435A (en) * | 2004-06-10 | 2005-12-22 | Jfe Steel Kk | Continuous casting method for steel |
| CN201124222Y (en) * | 2007-11-21 | 2008-10-01 | 南阳海成冶金耐材有限公司 | Multi-layer filtration column combined tundish filter |
| CN102303113A (en) * | 2011-08-29 | 2012-01-04 | 武汉钢铁(集团)公司 | Continuous casting tundish porous baffle wall having functions of casting and calcium treatment |
| CN202667580U (en) * | 2012-07-15 | 2013-01-16 | 鞍钢股份有限公司 | Device for purifying molten steel in tundish |
-
2013
- 2013-08-29 CN CN2013103862960A patent/CN103464732A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995006534A1 (en) * | 1993-08-28 | 1995-03-09 | Foseco International Limited | Purifying molten metal |
| JP2005349435A (en) * | 2004-06-10 | 2005-12-22 | Jfe Steel Kk | Continuous casting method for steel |
| CN201124222Y (en) * | 2007-11-21 | 2008-10-01 | 南阳海成冶金耐材有限公司 | Multi-layer filtration column combined tundish filter |
| CN102303113A (en) * | 2011-08-29 | 2012-01-04 | 武汉钢铁(集团)公司 | Continuous casting tundish porous baffle wall having functions of casting and calcium treatment |
| CN202667580U (en) * | 2012-07-15 | 2013-01-16 | 鞍钢股份有限公司 | Device for purifying molten steel in tundish |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111299535A (en) * | 2020-04-17 | 2020-06-19 | 攀钢集团攀枝花钢钒有限公司 | Quality control method for head covering blank in slab continuous casting |
| CN113828742A (en) * | 2020-06-23 | 2021-12-24 | 宝山钢铁股份有限公司 | Covering agent for preventing slag entrapment in pouring area of tundish and application |
| CN114921611A (en) * | 2022-05-23 | 2022-08-19 | 辽宁北祥重工机械制造有限公司 | Process method for producing large-scale high-quality alloy structural steel and high-quality carbon structural steel ingots |
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Application publication date: 20131225 |
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