CN101905319A - Steel pouring procedure and lower nozzle brick - Google Patents
Steel pouring procedure and lower nozzle brick Download PDFInfo
- Publication number
- CN101905319A CN101905319A CN 201010248986 CN201010248986A CN101905319A CN 101905319 A CN101905319 A CN 101905319A CN 201010248986 CN201010248986 CN 201010248986 CN 201010248986 A CN201010248986 A CN 201010248986A CN 101905319 A CN101905319 A CN 101905319A
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- molten steel
- steel
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- mouth
- lower nozzle
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Abstract
The invention is improvement on lower nozzle brick used for steel pouring. The invention is characterized in that a gas storage chamber is arranged in the inner wall of lower nozzle, more than two groups of through air holes which are not corresponding and are in constant slope are formed between the gas storage chamber and a lower nozzle cast hole, when argon is pumped in, the argon blows down molten steel flowed out from the through air holes by virtue of the gas storage chamber and the through air holes, so that the molten steel is formed into molten steel drops and the molten steel are injected into a steel ingot mould in a 'raining' way, thus effectively discharging the gas stored in the molten steel avoiding that steel ingot quality is influenced owning to mixing of harmful gas.
Description
Technical field
The present invention is the improvement to iron and steel mold pouring procedure and used slip lower nozzle brick, relate in particular to a kind of can the realization " formula drenches with rain " casting, with pernicious gas in further cleaning molten steel, the discharge molten steel, reduce pernicious gas and remain in steel pouring procedure and the used lower nozzle brick that forms shrinkage cavity defect in the steel ingot.
Background technology
In order to obtain high-quality clean molten steel, way is to add composite refiner in vacuum drying oven usually, makes deoxidation products and field trash in the molten steel form liquid phase come-up and removal.Adopt the vacuum external refining in addition, do not adopt tundish and covering slag, make refractory material and melt cinder etc. be reduced to minimum level or the like the pollution of molten steel.But all measures all can not solve the influence that ingot quality is produced that is mingled with of pernicious gas, have harmful gas residue in the molten steel, can cause forming in steel ingot shrinkage cavity defect.In addition, for preventing the secondary oxidation in the molten steel casting process, also adopt vacuum casting, vacuum casting only is and isolate from outer air to get rid of pernicious gas in the molten steel.
People are for reducing pernicious gas in the molten steel, and same more employing is similar takes off assorted method.Removed by adding auxiliary agent, for example:
Chinese patent CN1693487 deoxidation agent for purifying molten steel, the pernicious gas in the molten steel can be effectively removed in adding, and oxygen content can be reduced to below the 20ppm, and cleaning molten steel improves the qualification rate of product effectively.
Chinese patent CN1786202 smelting iron and steel carbonaceous pelletizing, adding in the molten steel can not only carburetting, and can reduce steel inclusion, and remove pernicious gas, and can purify crystal boundary, crystal grain thinning, thus improve the toughness of steel.
Chinese patent CN1329174 agent for purifying molten steel and cleaning molten steel method, join below the molten steel the cleanser frit made from bell jar plunging or ladle bottom pouring process, realize deoxidation from bottom to top, desulfurization, degasification, removal non-metallic inclusion.
Adopt and add various cleansers, deoxidier chemical treatment method removal gaseous impurity method, though can remove some pernicious gas impurity, yet because the adding of cleanser, deoxidier, when purifying the removal gaseous impurity, certainly lead to chemical reaction product, there is the quality that also must influence molten steel in these product, and this method has also increased cost simultaneously.
Chinese patent CN1434135 casting and pouring is with little ladle blowing purification method and apparatus.In bag, be blown into inert gas in the molten steel by being arranged on molten steel bag bottom blowing device, reduce pernicious gas and impurity in the liquid metals with this.Be blown into inert gas by ladle bottom, its effect be make molten steel form " seething " thus effect makes that bag end slag is floating to be removed to liquid level, " seethe " simultaneously subsidiaryly to disengage portion gas, so exhaust is difficult to thoroughly.
Chinese patent CN101602104 tundish and use this tundish to remove the nonmetal impurities method, one air curtain barricade wall is set in tundish, be blown into the argon gas disperse by air curtain barricade wall in the molten steel and become bubble, the pernicious gases such as N, O in the absorption molten steel reduce the content of these elements in the molten steel; Bubble floating plays and stirs the molten steel effect simultaneously, takes up inorganic non-metallic field trashes such as oxide in the molten steel, nitride, sulfide, silicate, makes them by the absorption of the slag charge of molten steel face, and the cleanliness factor of molten steel further improves.This method is ditto the same, is blown into the argon gas exhaust and is difficult to thoroughly in molten steel, and next adopts tundish and covering slag has increased refractory material and melt cinder pollutes molten steel, and easily produces secondary impurities.
Above-mentioned deficiency still has is worth improved place.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, provides a kind of and does not produce any accessory substance by physical means, and the simple and effective high-quality of energy is got rid of the steel pouring procedure of pernicious gas in the molten liquid steel.
Another purpose of the present invention is to provide a kind of easy realization said method used lower nozzle brick.
The present invention's first purpose realizes, the main improvement is in molten steel is cast dirty process, by the harmless inert gas of molten steel being dispelled molten steel to dirty molten steel winding-up, make the dirty molten steel of casting realize " formula drenches with rain " diffusing pouring whereabouts casting, pernicious gas is overflowed obtain getting rid of, the cleanliness factor of molten steel further improves, thereby has overcome the deficiencies in the prior art, realizes the object of the invention.Specifically, steel pouring procedure of the present invention is included in the dirty cast of molten steel in the vacuum chamber, it is characterized in that in the dirty casting process of molten steel, and the shape that drenches with rain by jetting to the harmless inert gas of molten steel to dirty molten steel, dirty molten steel being falls.
The present invention, makes the dirty molten steel of casting be the shape that drenches with rain and falls the harmless inert gas of molten steel to the winding-up of dirty molten steel, thereby making that contained pernicious gas obtains discharging in the molten steel overflows, and reaches to reduce and get rid of purpose.The winding-up inert gas is dirty molten steel to drench with rain shape to fall, wherein a kind of better winding-up inert gas, be to carry out in the mouth of a river down, owing to having certain space between the mouth of a river and mold down, thereby help overflowing shedding of pernicious gas, in addition, the following mouth of a river is difficult for causing the new ambient atmos that entrainments near mold; Wherein more preferably descend mouth of a river side face simultaneously to the winding-up of whereabouts molten steel to the harmless inert gas of molten steel, the casting molten steel that can cause to fall and break is fully dispersed and is realized that the total cross-section shape that drenches with rain falls, and makes that pernicious gas thoroughly sheds in the molten steel.
Consider that the whereabouts molten steel disperses because of winding-up forms, disperse molten steel contraction injection mold die orifice for conveniently making, a kind of better mode is that down below, the mouth of a river, mold mouth top (between the following mouth of a river and mold mouth) are provided with anti-molten steel and to the free of contamination substantially collector ring of molten steel, graphite collector ring for example, making drenches with rain disperses the molten steel convergence.Because casting is to carry out,, also can omit collector ring by regulating vacuum, molten steel down-off etc. in vacuum chamber.
The present invention is said to the harmless inert gas of molten steel, known to the technical staff, and for example argon gas, nitrogen, neon, this belongs to prior art.
Iron and steel casting generally adopts sliding sprue tile for smelting to control steel flow velocity degree, and for making the molten steel shape better effects if that falls to drenching with rain, better winding-up is to carry out in the mouth of a river down.Therefore optimize and realize the inventive method lower nozzle brick, comprise mouth of a river body down, it is characterized in that in the thickness of the mouth of a river hollow gas chamber that is communicated with outer air feed being arranged down, following mouth of a river blowhole internal face is distributed with the insufflation channel of a plurality of connection air chambers.Outer air feed enters down mouth of a river air chamber,, the whereabouts molten steel dispelled is the shape that drenches with rain to the dirty molten steel winding-up inert gas harmless to molten steel by each insufflation channel, makes that including pernicious gas is overflowed, thereby reaches the pernicious gas purpose of getting rid of in the molten liquid steel.
Among the present invention:
Hollow gas chamber in the wall thickness of the following mouth of a river is mainly used in to each insufflation channel air feed, and each insufflation channel is directly outer to connect air feed to simplify, and even each insufflation channel blow gas pressure.Consider down that mouth of a river dimension volume is less, and lower nozzle brick thickness is limited, from both helping improving the air blowing uniformity, avoid loopful shape hollow gas chamber to influence intensity again, a kind of better is that hollow gas chamber is two sections or three sections arcuate structures, each section arc air chamber is outer respectively to connect air feed, and connects some insufflation channel, for example is no less than 3.According to following mouth of a river size, insufflation channel design quantity difference, an optimum principle is that better inner peripheral surface distribution is the smaller the better at interval, can better improve to dispel uniformity.
Each insufflation channel outlet of side face, a kind of better outlet is roughly in the isoplanar, and not deflection of shape molten steel helps drenching with rain; Wherein be more preferably the gas outlet and be positioned at bottom, the mouth of a river down, for example descend most outlet in mouth of a river outlet 3-8cm, winding-up closely more helps dispelling molten steel from tapping hole like this, and pernicious gas overflows.
Insufflation channel, a kind of being preferably adopted the clear opening structure, and both convenient the making can reduce the resistance of blowing again; It is tilting downwards that straight-through insufflation channel better is, and falls to the easier formation of the declivity spray formula that drenches with rain, and wherein gradient can be 15～85 degree, wherein 30-50 degree more preferably.The aperture of each straight-through passage is preferably 1～5mm, and this pore diameter range has and better dispels effect.Insufflation channel, a kind of more preferably have several layers up and down, can molten steel be dispersed to be the formula that drenches with rain.
Yet, be to be understood that the technical staff passes through the understanding to technical solution of the present invention, the molten steel of realizing causing to fall and break is the shape that drenches with rain, and not exclusive have only adopt down winding-up inert gas in the mouth of a river to realize, just jet at other positions with respect to dirty molten steel, position, the following mouth of a river is better.
The present invention is by the inert gas harmless to molten steel of jetting to the dirty molten steel of casting, control dirty molten steel flow simultaneously, and jet tolerance, gas speed, can make dirty molten steel in dropping process, form the similar shape droplets fall that drenches with rain and inject ingot mould, molten steel is the shape that drenches with rain and falls, the molten steel of dispersing is overflowed the pernicious gas that is present in the molten steel and obtains getting rid of, thereby simple and effective realization makes pernicious gas discharge in the molten steel, avoids pernicious gas to be mixed in and forms shrinkage cavity defect in the teeming.Through the real contrast test of watering, adopt the inventive method teeming flaw detection not find shrinkage cavity substantially.The inventive method adopts than prior art and add " air-breathing or reactant " in molten steel, and the physical method exhaust does not produce reactant impurity, thereby can not cause new pollution.The preferable realization molten steel of the present invention used down mouth of a river of shape that drenches with rain, make in molten steel winding-up inert gas is in the blowhole of the following mouth of a river and carry out, by controlling dirty molten steel flow simultaneously, and jet tolerance, gas speed, can reach the optimum pernicious gas in the molten steel of getting rid of, control is simple to be realized easily, simultaneously because of under the mouth of a river more near casting gate, be difficult for causing the new ambient atmos that entrainments, and also need do not increase auxiliary device.The winding-up passage of air chamber and connection is set in the wall thickness of the following mouth of a river, simple in structure, easy to make, do not change mouth of a river manufacturing process down substantially.Downward-sloping straight-through injection hole, and injection hole outlet is arranged on down bottom, the mouth of a river forms molten steel to drench with rain the formula whereabouts easilier.
Optimize specific embodiment below in conjunction with one; essence of the present invention is further understood in exemplary illustration and help; but the embodiment detail only is for the present invention is described; do not represent the present invention to conceive whole technical schemes down; therefore should not be construed as the total technical scheme of the present invention is limited; some are In the view of the technical staff; the unsubstantiality that does not depart from the present invention's design increases and/or change; for example simple the change or replacement of technical characterictic to have same or similar technique effect all belongs to protection domain of the present invention.
Description of drawings
Fig. 1 is a kind of realization of the present invention formula casting lower nozzle brick structural representation that drenches with rain.
Fig. 2 is the present invention's formula casting schematic diagram that drenches with rain.
The specific embodiment
Embodiment: referring to Fig. 1,2, the present invention realizes that the molten steel formula that drenches with rain falls to using the mouth of a river 4 down, and shape and structure, size are with the mouth of a river under the prior art of same size.There is the annular of certain altitude to be communicated with air chamber 1 (also can be to be interrupted two to three segmental arcs) in the wall thickness of bottom, the following mouth of a river, air chamber 1 is communicated with outer air supply pipe 3, following mouth of a river blowhole inner peripheral surface be evenly distributed with some alternate, up and down 4 layers a plurality of downward-sloping 45 the degree straight-through airways 2, the airway air inlet is communicated with air chamber with annular and is communicated with, plane, each layer gas outlet is substantially flush, the orlop gas outlet is near mouth of a river outlet down, for example apart from exit end face 3-5cm.
During cast, by prior art vacuum pouring mode, tundish 5 belows connect the mouth of a river 4 under the embodiment by sled mechanism, and there is the graphite guide ring 6 of graphite guide ring support 7 location below, the following mouth of a river, and the guide ring below is an ingot mould 8.Tundish 5 bottoms to ingot mould 8 is arranged in the vacuum chamber 9.When watering steel, be blown into the 0.2-0.3Mpa argon gas by air inlet pipe 3, the molten steel that causes to fall and break is " formula drenches with rain ", compiles by the graphite guide ring and injects ingot mould 8.
To those skilled in the art; under this patent design and specific embodiment enlightenment; some distortion that can directly derive or associate from this patent disclosure and general knowledge; those of ordinary skills will recognize also can adopt additive method; or the substituting of known technology commonly used in the prior art; and the mutual various combination between feature; the for example change of ring-shaped air chamber and gas hole; or the like unsubstantiality change; can be employed equally; can both realize this patent representation function and effect, launch for example no longer one by one to describe in detail, all belong to this patent protection domain.
Be the convenience on describing, the nozzle brick of the present invention and the following mouth of a river are synonym.
Claims (11)
1. steel pouring procedure is included in the dirty cast of molten steel in the vacuum chamber, it is characterized in that in the dirty casting process of molten steel, and the shape that drenches with rain by jetting to the harmless inert gas of molten steel to dirty molten steel, dirty molten steel being falls.
2. according to the described steel pouring procedure of claim 1, it is characterized in that harmless inert gas is carrying out in the mouth of a river down to molten steel to dirty molten steel winding-up.
3. according to claim 1 or 2 described steel pouring procedures, it is characterized in that between the mouth of a river and mold anti-molten steel being arranged down and to the free of contamination substantially collector ring of molten steel.
4. lower nozzle brick is used in the iron and steel cast, comprises mouth of a river body down, it is characterized in that in the thickness of the mouth of a river hollow gas chamber that is communicated with outer air feed being arranged down, and following mouth of a river blowhole internal face is distributed with the insufflation channel of a plurality of connection air chambers.
5. lower nozzle brick is used in described iron and steel cast according to claim 4, it is characterized in that insufflation channel has several layers up and down, and each layer outlet is substantially flush.
6. lower nozzle brick is used in described iron and steel cast according to claim 4, it is characterized in that insufflation channel in following lower end, the mouth of a river, the approaching mouth of a river exit end face down of orlop outlet.
7. lower nozzle brick is used in described iron and steel cast according to claim 4, it is characterized in that insufflation channel is downward tilting straight channel.
8. lower nozzle brick use in cast according to the described iron and steel of claim 7, it is characterized in that insufflation channel issues oblique 15～85 downwards and spend.
9. lower nozzle brick use in the cast of described according to Claim 8 iron and steel, it is characterized in that insufflation channel issues oblique 30～50 downwards and spend.
10. lower nozzle brick is used in described iron and steel cast according to claim 4, it is characterized in that each insufflation channel aperture is 1～5mm.
11. lower nozzle brick is used in described iron and steel cast according to arbitrary claim in the claim 4 to 10, it is characterized in that insufflation channel evenly distributes at following mouth of a river inner peripheral surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010248986 CN101905319A (en) | 2010-08-05 | 2010-08-05 | Steel pouring procedure and lower nozzle brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010248986 CN101905319A (en) | 2010-08-05 | 2010-08-05 | Steel pouring procedure and lower nozzle brick |
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| Publication Number | Publication Date |
|---|---|
| CN101905319A true CN101905319A (en) | 2010-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010248986 Pending CN101905319A (en) | 2010-08-05 | 2010-08-05 | Steel pouring procedure and lower nozzle brick |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489679A (en) * | 2011-12-29 | 2012-06-13 | 上海宝明耐火材料有限公司 | Anti-blocking water feeding port with low air permeability |
| CN104707984A (en) * | 2015-03-31 | 2015-06-17 | 中国重型机械研究院股份公司 | Automatic control system for pouring box plug rod for vacuum casting |
| CN106141159A (en) * | 2015-04-13 | 2016-11-23 | 天工爱和特钢有限公司 | A kind of argon protecting cover of high speed steel mould pouring in steel smelting |
| CN106735154A (en) * | 2016-12-28 | 2017-05-31 | 二重集团（德阳）重型装备股份有限公司 | The mixed gas molten steel atomising device in the vacuum pouring mouth of a river |
| CN108213401A (en) * | 2018-01-18 | 2018-06-29 | 华北理工大学 | The method at the metallurgical mouth of a river and molding casting of molding casting |
| CN114054739A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团研究院有限公司 | Submerged nozzle for promoting high efficiency and high cleanness and continuous casting production method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02104454A (en) * | 1988-10-11 | 1990-04-17 | Akechi Ceramics Kk | Nozzle for continuous casting |
| JPH02151353A (en) * | 1988-12-05 | 1990-06-11 | Nkk Corp | Submerged nozzle for continuous casting |
| JPH0890177A (en) * | 1994-09-22 | 1996-04-09 | Kobe Steel Ltd | Immersion nozzle for continuous casting |
| CN1694774A (en) * | 2002-09-03 | 2005-11-09 | 维苏维尤斯·克鲁斯布公司 | Gas purged nozzle |
| CN101774016A (en) * | 2008-12-16 | 2010-07-14 | 中国第一重型机械股份公司 | Water opening of pouring box for vacuum ingot casting |
| CN201880912U (en) * | 2010-08-05 | 2011-06-29 | 宜兴市耐火材料有限公司 | Collector nozzle brick for steel casting |
-
2010
- 2010-08-05 CN CN 201010248986 patent/CN101905319A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02104454A (en) * | 1988-10-11 | 1990-04-17 | Akechi Ceramics Kk | Nozzle for continuous casting |
| JPH02151353A (en) * | 1988-12-05 | 1990-06-11 | Nkk Corp | Submerged nozzle for continuous casting |
| JPH0890177A (en) * | 1994-09-22 | 1996-04-09 | Kobe Steel Ltd | Immersion nozzle for continuous casting |
| CN1694774A (en) * | 2002-09-03 | 2005-11-09 | 维苏维尤斯·克鲁斯布公司 | Gas purged nozzle |
| CN101774016A (en) * | 2008-12-16 | 2010-07-14 | 中国第一重型机械股份公司 | Water opening of pouring box for vacuum ingot casting |
| CN201880912U (en) * | 2010-08-05 | 2011-06-29 | 宜兴市耐火材料有限公司 | Collector nozzle brick for steel casting |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102489679A (en) * | 2011-12-29 | 2012-06-13 | 上海宝明耐火材料有限公司 | Anti-blocking water feeding port with low air permeability |
| CN104707984A (en) * | 2015-03-31 | 2015-06-17 | 中国重型机械研究院股份公司 | Automatic control system for pouring box plug rod for vacuum casting |
| CN106141159A (en) * | 2015-04-13 | 2016-11-23 | 天工爱和特钢有限公司 | A kind of argon protecting cover of high speed steel mould pouring in steel smelting |
| CN106735154A (en) * | 2016-12-28 | 2017-05-31 | 二重集团（德阳）重型装备股份有限公司 | The mixed gas molten steel atomising device in the vacuum pouring mouth of a river |
| CN108213401A (en) * | 2018-01-18 | 2018-06-29 | 华北理工大学 | The method at the metallurgical mouth of a river and molding casting of molding casting |
| CN114054739A (en) * | 2021-11-15 | 2022-02-18 | 攀钢集团研究院有限公司 | Submerged nozzle for promoting high efficiency and high cleanness and continuous casting production method |
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Open date: 20101208 |