CN102398024A - Impacting box with enhanced impacting surface - Google Patents
Impacting box with enhanced impacting surface Download PDFInfo
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- CN102398024A CN102398024A CN2010102898622A CN201010289862A CN102398024A CN 102398024 A CN102398024 A CN 102398024A CN 2010102898622 A CN2010102898622 A CN 2010102898622A CN 201010289862 A CN201010289862 A CN 201010289862A CN 102398024 A CN102398024 A CN 102398024A
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- impingement box
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Abstract
The invention discloses an impacting box (1), which is used for bearing and changing the entered molten metal flow in a metallurgical container (10), and comprises a base (2), a side wall (4) and an opening (5), wherein the side wall (4) extends out from at least partial periphery of the base (2), the inner space of the impacting box (1) is formed by the side wall (4) and the base together, the opening (5) is positioned at the opposite end of the side wall and is used for allowing the entered molten metal flow to enter the inner space, and the base (2) further comprises an impacting surface (3a) which faces the opening (5) of the impacting box. The impacting box is characterized in that: compared with the residential materials of the impacting box (1), the material of the impacting surface (3a) has higher corrosion resistance to the entered molten metal flow.
Description
Technical field
The present invention relates generally to be used for the tundish container of motlten metal continuous casting; The impingement box that particularly relates to tundish, this impingement box are designed to prevent that the motlten metal in the tundish from splashing or turbulent flow; The tundish impingement box that more particularly relates to service life with lengthening.
Background technology
Tundish container (10) is used for holding by the motlten metal of big bag (11) through an a certain amount of or molten bath of long nozzle (12) adding, for example molten iron or molten steel (referring to Fig. 1).Tundish (10) is placed between big bag (11) and casting device or the crystallizer (13), and said casting device or crystallizer (13) are accepted motlten metal and made it to form the product of different shape.Big bag (11) is placed on several meters, tundish (10) top; The long nozzle of elongate tubular (12) is incorporated into tundish (10) from big bag (11).Long nozzle (12) joins motlten metal in the tundish (10) to have closely knit motlten metal stream kinetic energy, rapidly.
The cast pad that is arranged in the tundish has been used for preventing the impulsive force damage that the work lining of tundish and the motlten metal that safe lining is got into flow widely.Recently, in order to control mobile turbulent flow, developed impingement box, in fact this impingement box changes the molten metal flow of entering to reduce the turbulent flow that in the molten bath, is produced by the motlten metal stream that gets into.Such impingement box once was disclosed, for example, and at EP-B1-0729393, EP-B1-0790873, EP-B1-0847313, EP-B1-0894035, EP-B1-1198315, EP-B1-1490192.It is to be noted that technical literature and trade literature are represented this impingement box through " impact pad " commonly used.The strict interpretation of term " impact pad " is the expression thin plate-shaped structure, and disclosed geometry falls far short in this and the above-mentioned document of quoting, and disclosed geometry is more near case but not plate in the above-mentioned document of quoting.For this reason, in about context of the present invention, term " impingement box " will be used to represent top disclosed device.Because term " impact pad " extensive use refers to box structure in document; For fear of misunderstanding; To avoid the use of term " impact pad " in this article, and replace the slab structure of entity that term " shock plate " is used for representing being designed to bearing the motlten metal stream of entering.The territory, bag base area by the brick manufacturing thicker or more durable than all the other bricks at the bag end just represented at first in term " impact pad ".This zone can limit through the made wall of brick protuberance.Impact pad be actually the integral part of metallurgical tank and usually and the container lining make simultaneously.On the other hand, " impingement box " expression comprises the separate article of substrate and wall, and it is installed in the metallurgical tank and is designed to bear the motlten metal stream of entering.Impingement box is mounted usually or is placed on the bottom surface of container.
Shown in above listed prior art document, the turbulent flow that splashes and water in time process in casting the when shape of impingement box can be designed to make casting to water time beginning is minimum.The motlten metal stream that gets into-for example enters into the steel flow of tundish (10)-with the bottom of very large energy impact impingement box through long nozzle (12) from big bag 11.If casting is watered inferior long; And need be from big bag repeatedly such adding; The crack occurs to such an extent as to then can be etched at the bottom of the case of impingement box and damage, molten steel flows out from such crack and forms short circuit, so that the turbulent flow of the motlten metal stream that gets in the final tundish is no longer controlled.In addition, no longer the be hit protection of case and the motlten metal that can be got into stream of the bottom of tundish itself damages.
Main purpose of the present invention is exactly to solve such problem to bear the other problems in the impingement box of motlten metal stream of entering with being used at metallurgical tank; Said impingement box has substrate; Be shock surface above it, extend upward the formation sidewall around the said substrate.
Summary of the invention
The present invention limits through appended independent claims.Dependent claims limits most preferred embodiment.Particularly, the present invention relates to be used for bearing and changing at metallurgical tank (for example tundish) impingement box of the motlten metal stream of entering, this impingement box comprises substrate, sidewall and opening.Sidewall is protruding upward from substrate periphery at least a portion, and forms the inner space of said impingement box with substrate; Opening is formed by the end of said sidewall.The motlten metal stream of said entering gets into said inner space thus.Said substrate has the shock surface towards the impingement box opening, is used to bear the motlten metal stream of entering, said shock surface by than impingement box remainder to the erosion of the motlten metal stream that gets into and/or the made that corrosion has higher resistivity.
According to of the present invention one useful embodiment, shock surface is made up of the shock plate in the depression that preferably is embedded into substrate.When impingement box according to the present invention was used to very mordant steel grade, some molten steel possibly flow through the slit between shock plate and the substrate and penetrate into below this shock plate.Such steel infiltration can cause further problem, for example, this shock plate is broken away from.The problem of the molten steel thin slice between two refractory component of this infiltration is commonly called " joint flash ".For fear of joint flash occurring, the edge in shock plate cross section carries out useful variation along the thickness direction of shock plate, and matches with the sidewall surfaces of embedded depression.For example, its peripheral at least a portion that is recessed in of substrate has a groove, and shock plate has the joint tongue that is complementary in its peripheral appropriate section.Can securely shock plate be fixed in the substrate of impingement box like this.For joint flash, metal can arrive the surface of shock plate and substrate joggle piece, and shock plate is pressed to the bottom of embedded depression, thereby has prevented that any joint flash from arriving the bottom of embedded depression.
Shock plate can be processed by magnesia-carbon or aluminium oxide-carbon class refractory material.This type refractory material is well-known because of its remarkable erosion resisting to molten steel.On the other hand, the remainder of impingement box can be made by any material that is used for making impingement box traditionally, for example, and a cast type refractory material (for example, based on aluminium oxide, magnesia, zirconia etc.).The surface of shock plate can have the Any shape that is suitable for used impingement box and/or tundish type.Particularly, its shape can be circle, ellipse, polygon etc.It can be whole, perhaps is made up of several element assemblings.Shock plate will cover usually and surpass 25%, preferably surpass 50% impingement box bottom surface.Usually, shock plate has 2 to 5 centimetres thickness (t), but bigger value also is possible.Usually, this thickness accounts for 20% to 80% of substrate thickness.Shock surface can have several kinds of geometries: it can be that put down, concave surface, convex surface; It can be structurized; Or can be with respect to the bag slanted floor of tundish; All these motlten metals that become example influence entering flow reformed mode, and the geometry of foundry production line and particularly tundish is depended in the selection of an impingement box geometry.
Description of drawings
Various embodiment of the present invention shown in the drawings
Fig. 1 schematically shows typical continuous casting line.
Fig. 2 shows the three-dimensional cutaway view according to an instance of impingement box of the present invention.
Fig. 3 a-3d shows the various embodiment of impingement box geometry.
Fig. 4 a-4c shows other embodiment of impingement box geometry.
The specific embodiment
The instance of impingement box (1) has been shown among Fig. 2, this impingement box be used for resembling the such metallurgical tank of tundish (10) bear and change that free-falling gets into motlten metal stream.Impingement box (1) comprises substrate (2), and the bottom lower surface contact of substrate (2) also is fixed at the bottom of the bag of tundish (10) usually, and the upper surface of substrate (2) constitutes at the bottom of the case of impingement box.Sidewall (4) is from peripheral at least a portion (being preferably whole) of substrate (2) protrusion, and forms the inner space of said impingement box (1) with substrate.The impingement box top (promptly; Facing surfaces at the bottom of the end of said sidewall and case) forms opening (5); On the one hand; This opening is used for allowing the motlten metal of said entering to flow into said inner space, the shock surface (3a) on the motlten metal of said entering stream bump is positioned at the bottom of the case thereby and be diverted on the sidewall (4), and on the other hand; This opening is used for allowing altered metal flow to flow out the molten bath that impingement box gets into tundish, and is less thereby the turbulent flow that in the molten bath, produces is compared when not having impingement box.For the various embodiment that disclose the impingement box geometry in the prior art of quoting in the above-mentioned introduction, the effect of the turbulent level that impingement box reduces to be produced by the motlten metal stream that gets into depends on the geometry of impingement box very much.The characteristic that a stepping type is arranged look like opening (5) and should not cover the formed whole surface of periphery, top by sidewall (4), and inner flange preferably should be extended to form the structure of overhanging shown in Fig. 2 around whole periphery.The size of opening (5) must enough flow into and allow its outflow with the motlten metal that allows motlten metal to get into greatly; And simultaneously must be sufficiently little to limit the inner space geometry that the most suitable control is flowed, so that produce the output that is called piston flow ideally.Impingement box generally includes single opening (5), but also can comprise an import and at least one outlet, as disclosed among for example WO02/094480 or the WO2010/063431.The turbulent flow that reduces in the molten bath is very important for preventing that slag floating on weld pool surface and other impurity from mixing and being distributed in the simple metal melt in molten bath, particularly in assigned region in crystallizer (13).Generally speaking, the advantage of impingement box is well-known and in document, is described (for example, referring to the above document of quoting) in large quantities.
On the shock surface of impingement box (3a) is positioned at the bottom of the case, under the outlet of impingement box opening (5) and long nozzle (12).This shock surface is the position that the motlten metal stream that gets at first contacts with sizable active force and impingement box, and shock surface receives the threat of great erosion and corrosion, and this has limited the service life of impingement box.Because depend on the weak element that can only under the situation of stopping watering, could change the service life of continuous casting line, the importance that therefore prolongs impingement box service life is significant.The present invention proposes a kind of scheme; Come to prolong greatly the life-span of impingement box through using with impingement box remainder material different manufacturing shock surface; Compare with the material of impingement box remainder, the material of said manufacturing shock surface has higher corrosion resistance to the erosion by the motlten metal stream that gets into.In fact simple proposal is highly profitable on this surface, because it provides a kind of effective means that prolongs the impingement box life-span, it is very simple and cheap that this mode implements.
When the structure of impingement box (promptly; Substrate, sidewall and top flange) usually (for example by pouring fireproof material; Based on aluminium oxide, magnesia, zirconia etc.) when making; Shock surface (3a) is preferably made by for example magnesia-carbon or aluminium oxide-carbon refractory composition, and these materials are characterised in that to compare with the material of front to have splendid erosion resisting and/or corrosion resistance.Shock surface can be processed by several parts (for example brick), perhaps preferably formed by overall structure, for example shock plate (3).It is useful adopting shock plate (3), because the shock surface (3a) that forms like this provides the space that the joint flash defective possibly take place still less.When using integrated impact plate (3), various geometries are also made and realize to impingement box more easily and more cheaply.For example, shock plate can be made (for example, precompressed) in advance, and during the remainder of making impingement box, is embedded in the substrate of impingement box.
Shock surface needn't cover the Zone Full of impingement box, because the function of shock surface is proved to be only effective at the impact zone of the motlten metal stream that gets into.The geometry that depends on impingement box, shock surface can cover at least 25% at the bottom of the impingement box case, and preferably at least 50%.Normally square or rectangle at the bottom of the case of impingement box, but also can have other geometries, and for example disclosed circle or polygon among the WO02/094480 perhaps have the combination like disclosed straight wall and curved wall among the US2007/0132162.Shock surface can be located substantially on the center at the bottom of the case, perhaps the off-centre shown in the disclosed or accompanying drawing 4 (a) among the WO2010/063431 for example.
In its simplest form, shock surface (3a) is putting down basically shown in figure (3).If use shock plate (3), in the coupling depression on then it preferably is embedded at the bottom of the case.This can realize in the following manner easily: shock plate (3) is positioned at the instrument that is used for making impingement box
On the position of expectation, the material that will be used for the impingement box remainder then is poured into mould and is cast in shock plate (3).The edge of shock plate (3) can be straight shown in Fig. 3 (a).
For fear of the risk of any joint flash (promptly; Metal bath penetrates in the depression and the space between the shock plate of impingement box; This finally can cause shock plate to lose the sealing to molten steel under extreme case); The edge that can be used as shock plate cross section preferably is along the thickness direction of shock plate and change, and matches with the surface of embedded depression, shown in Fig. 3 (b) and 3 (c).Specifically, if the periphery of the depression in the substrate (2) at least a portion has a groove, and shock plate (3) has the joint tongue (3b) that is complementary in its peripheral appropriate section.Any metal that infiltrates the space so can arrive in the slit between the groove of plate joint tongue 3b and base recess, thereby further shock plate 3 is pressed against on the concave bottom, further develops so that stop melt to infiltrate, and makes shock plate can not lose sealing.
Shock surface (3a) needs not to be the plane, and can be concave surface, convex surface or can be structurized (referring to, Fig. 4 (b) and 4 (c)).Shock surface (3a) can and be centered on by groove as disclosed among the EP0847313 shown in Fig. 3 (d).The motlten metal that these different structures influences get into flows the form of reformed mode and output stream.Optimal design depends on the master-plan of continuous casting line, the position of the diameter of the capacity of for example big bag (11) and height, long nozzle (12), the geometry of tundish (10), tundish outlet etc.Shock surface (3a) need not to be level so that vertically withstand shocks stream, and in some cases, useful is to make the bag slanted floor of shock surface with respect to tundish, thereby so that reduces the angle of shock and reduce turbulent flow.One instance of this inclined impact face has been shown in Fig. 4 a.Can see that shock surface 3a is eccentric, thereby the motlten metal that gets into flows at the top on inclined-plane the impact face;,, locate to dirty along the inclined-plane at this relative sidewall (4) up to arriving relative sidewall (4); The motlten metal stream that gets into is directed to the top below top flange;, change direction once more here, discharge up to opening (5) through impingement box.
Impingement box of the present invention can quite easily be made, and need not change the manufacturing equipment that uses traditionally.As discussed above, in the situation of using shock plate (3), it is placed in the mould that is used for casting impingement box preferably by preform, and further fills the used material of impingement box remainder to said mould.Then, can cast and harden by mode known in those skilled in the art.Alternatively, can in single casting or pressing operation, shock surface (3a) be suppressed or cast with the material of impingement box remainder, and sclerosis then.In such implementation method, between the remainder of shock surface and impingement box, can not form tangible interface, thereby reduce the risk of joint flash.On the other hand, compare with the shock plate (3) that uses pre-embossed, this technology allows the geometry of impact face to carry out less control.
Claims (13)
1. impingement box (1) that is used for bearing and changing the motlten metal stream of entering at metallurgical tank (10); This impingement box (1) comprises substrate (2), sidewall (4) and opening (5); Sidewall (4) stretches out and forms the inner space of said impingement box (1) with substrate from least a portion periphery of substrate (2); The end that opening (5) is positioned at said sidewall is used to allow the motlten metal of said entering to flow into said inner space; Said substrate (2) also comprises the shock surface (3a) towards impingement box opening (5); It is characterized in that the motlten metal stream that the material of remainder of making material and the impingement box (1) of said shock surface (3a) compares said entering has higher corrosion resistance.
2. impingement box according to claim 1, wherein, said shock surface is processed by global facility, perhaps is made up of the sub-assembly of several parts.
3. impingement box according to claim 2, wherein, said shock surface (3) is through forming in the depression that a shock plate (3) is embedded into said substrate (2).
4. impingement box according to claim 3, wherein, the edge in shock plate cross section is along the thickness direction of shock plate and change, and matches with the surface of embedded depression.
5. impingement box according to claim 4, wherein, the periphery of the depression in the substrate (2) comprises a groove and extends to its peripheral at least a portion at least, and said shock plate (3) is included in its peripheral appropriate section and has the joint tongue (3b) that is complementary.
6. according to the described impingement box of aforementioned any one claim, wherein, said shock surface (3a) is by the made of the corrosion of unusual molten-metal-resistant and/or erosion.
7. impingement box according to claim 6; Wherein, Said shock surface (3a) is that said shock surface (3a) first-selection is made by aluminium oxide-carbon class refractory material by the made of selecting in the refractory material of magnesia-carbon, aluminium oxide-carbon class or their composite.
8. impingement box according to claim 7, wherein, the remainder of said impingement box is made by cast type refractory material.
9. according to the described impingement box of aforementioned any one claim, wherein, said shock surface covers at least 25% of impingement box bottom surface, preferably reaches at least 50%.
10. according to the described impingement box of aforementioned any one claim, wherein, said shock surface (3a) is concave surface, convex surface and/or structurized.
11. according to the described impingement box of aforementioned any one claim, wherein, groove (21) extends around the periphery of said shock surface (3a).
12. according to the described impingement box of aforementioned any one claim, wherein, said shock surface (3a) has formed towards the outside inclination angle of said impingement box (1) with the side of said substrate (2).
13. according to the described impingement box of aforementioned any one claim, wherein, said metallurgical tank (10) is a tundish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102898622A CN102398024A (en) | 2010-09-17 | 2010-09-17 | Impacting box with enhanced impacting surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102898622A CN102398024A (en) | 2010-09-17 | 2010-09-17 | Impacting box with enhanced impacting surface |
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| CN102398024A true CN102398024A (en) | 2012-04-04 |
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| CN2010102898622A Pending CN102398024A (en) | 2010-09-17 | 2010-09-17 | Impacting box with enhanced impacting surface |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5358551A (en) * | 1993-11-16 | 1994-10-25 | Ccpi, Inc. | Turbulence inhibiting tundish and impact pad and method of using |
| CN1341047A (en) * | 1999-02-22 | 2002-03-20 | 福塞科国际有限公司 | Tundish impact pad |
| CN2858127Y (en) * | 2005-12-13 | 2007-01-17 | 康荣臻 | Composition current stabilizer |
| CN201366492Y (en) * | 2009-01-19 | 2009-12-23 | 莱芜钢铁股份有限公司 | Flow control device for tundish of profiled blank conticaster |
-
2010
- 2010-09-17 CN CN2010102898622A patent/CN102398024A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5358551A (en) * | 1993-11-16 | 1994-10-25 | Ccpi, Inc. | Turbulence inhibiting tundish and impact pad and method of using |
| CN1341047A (en) * | 1999-02-22 | 2002-03-20 | 福塞科国际有限公司 | Tundish impact pad |
| CN2858127Y (en) * | 2005-12-13 | 2007-01-17 | 康荣臻 | Composition current stabilizer |
| CN201366492Y (en) * | 2009-01-19 | 2009-12-23 | 莱芜钢铁股份有限公司 | Flow control device for tundish of profiled blank conticaster |
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Application publication date: 20120404 |