EP1626829B1 - Method for producing a cast metal strip and corresponding twin roll casting installation - Google Patents
Method for producing a cast metal strip and corresponding twin roll casting installation Download PDFInfo
- Publication number
- EP1626829B1 EP1626829B1 EP04731907A EP04731907A EP1626829B1 EP 1626829 B1 EP1626829 B1 EP 1626829B1 EP 04731907 A EP04731907 A EP 04731907A EP 04731907 A EP04731907 A EP 04731907A EP 1626829 B1 EP1626829 B1 EP 1626829B1
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- EP
- European Patent Office
- Prior art keywords
- bath surface
- gas jet
- casting
- bath
- melt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- 238000005266 casting Methods 0.000 title claims abstract description 122
- 239000002184 metal Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- 238000009434 installation Methods 0.000 title abstract description 3
- 239000002245 particle Substances 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims description 156
- 239000000155 melt Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 26
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000009966 trimming Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000002844 melting Methods 0.000 description 20
- 230000008018 melting Effects 0.000 description 20
- 230000015572 biosynthetic process Effects 0.000 description 10
- 229910001208 Crucible steel Inorganic materials 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000007654 immersion Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000010405 reoxidation reaction Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000013528 metallic particle Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
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- 238000009795 derivation Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 210000004602 germ cell Anatomy 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004382 potting Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/005—Removing slag from a molten metal surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/064—Accessories therefor for supplying molten metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
- B22D11/0637—Accessories therefor
- B22D11/0697—Accessories therefor for casting in a protected atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/106—Shielding the molten jet
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/4998—Combined manufacture including applying or shaping of fluent material
- Y10T29/49988—Metal casting
- Y10T29/49991—Combined with rolling
Definitions
- the invention relates to a method for producing a cast metal strip using two casting rolls and two side plates, which together form a melting space and a casting gap, wherein molten metal is fed into the melting space, which forms a melt bath with an open-up bath surface in the melting space and from a cast metal strip is conveyed through the casting gap to the melting space and a delimited surface area is formed on the bath surface under the action of at least one gas jet to collect particles foreign to the melt, and a two-roll casting device for this purpose.
- the invention relates to a casting method for producing a continuously cast steel strip having a strip thickness between 0.5 mm and 10 mm using a two-roll caster with substantially vertically downwardly directed application of the cast steel strip.
- a Zweiwalzeng screen with vertical discharge of a metal strip is well known and this consists, as shown schematically in FIGS. 1 and 2, of two driven, counter-rotating casting rolls 1, 2 and two side plates 3, 4, preferably at the end faces of the casting rolls these are employed and thus form a melting space 5 for receiving molten metal introduced by a submersible pouring tube 6.
- the two axes of rotation of the casting rolls lie in a horizontal plane and are arranged parallel to each other at a distance, so that between the casting rolls a casting gap 7 is formed, which is limited in its longitudinal extent by the side plates and thus has a cross section corresponding to the cross section of the desired cast strip equivalent.
- the melting chamber opens into the casting gap, from which the metal strip emerges.
- non-metallic, non-metallic particles are entrained. These float to the bath surface, where they are agglomerated, also together with melt-extruded particles generated in the mold melt bath by chemical reaction with refractory material or by reoxidation, and are stored mainly at the contact line with the casting rolls directly at the casting roll shell surface in the strand bowls and At the surface and in the near-surface area of the cast metal strip form inclusions and microcracks for macro and microcracks.
- a two-roll caster and a casting method for potting a molten metal according to the described prior art is already known, for example, from JP-A 2001-314946, WO 02/083343 and JP-A 2-207946.
- JP-A 2001-314946 In order to keep molten foreign particles away from the contact line of the casting roll surface with the bath mirror surface, it is proposed in JP-A 2001-314946 to apply gas jets in the region of this contact line which cause the extraneous particles to drift off to the center of the melt pool.
- the gas jets spread over a portion of the casting roll surface and an edge region of the bath mirror surface, causing bath sway and temperature variations on the casting surface in a sensitive region, depending on the intensity and temperature of the gas jets, which affect strand growth.
- largely uniform starting conditions for strand shell formation in this area are particularly important for the end product.
- drifting of molten foreign particles entrained into the melt bath to the contact line of the metal bath with the mantle surfaces of the casting rolls during the current casting operation obliquely into the metal bath avoid immersion shields whose lower edges are positioned below the level of the outlet openings of the Tauchg bankrohres.
- a melt pool is to be created in the melting space, in which a separation of the non-metallic particles is made possible.
- the metal strip continuously produced by the two-roll caster is wound into coils, and at each end of the winding process of a single collar, the shields are removed from the metal bath and the particles deposited on the bath surface are blown with gas nozzles to at least one of the casting roll surfaces and thus with a short piece of the metal strip discharged.
- the main disadvantage of this method is that it produces a piece of broke after each cast coil, which interrupts the continuous production process and increases the reject rate of production.
- molten metal deposits on the shields, which solidifies each time the shield is raised. If the shield consists of refractory material, additionally eroded particles of the refractory material are introduced into the melt, or it comes to chemical reactions between the liquid steel and the refractory material, which also produce impurities.
- Weilass is already known from the postponed WO 03/049888 A2, apply gas jets directly on the bath surface, but no details are made to the place of application.
- the object of the present invention is therefore to avoid the disadvantages of the described prior art and to propose a method for producing a cast metal strip and a Zweiwalzeng screen listening, the entry of extraneous particles on or into the surface or in the near-surface region of the cast Bandes is largely avoided, reaches a largely trouble-free and delimited by a wave formation on the bath surface line of contact between the bath surface and the Gellowalzenmantel components while oxygen contact with the bath surface is largely avoided.
- This object is achieved on the basis of a method of the type mentioned above in that the at least one gas jet impinges on the bath surface at a distance of the gas jet axis from the contact line of the bath surface with the casting roll of 10 mm to 50 mm as measured on the bath surface.
- the at least one gas jet is formed in such a way that no gaps remain along the delimited surface area, through which particles foreign to the melt can escape.
- the delimited surface region can be formed by a gas jet forming a closed ring with an arbitrary outer contour or a plurality of successive gas jets.
- an inert or reducing protective gas atmosphere is generated and maintained, which virtually precludes reoxidation of the molten metal, especially in the case of metal melts which are prone to oxidation, such as steel, above the metal bath and within a melt space which is sealed off as best as possible.
- the at least one gas jet is directed directly at the bath surface. This achieves a quiet edge strip, which remains largely untouched by wave formation on the bath surface, between the contact region of the gas jet with the bath surface and the casting rolls and / or side plates delimiting the melt space. This measure greatly supports a consistently uniform and undisturbed strand shell formation on the mantle surfaces of the casting rolls rotating in accordance with the casting speed, provided that the casting roll surfaces run optimally stable, homogeneously uniformly and function.
- the at least one gas jet is directed at an angle of 25 ° to 145 °, preferably at an angle of 35 ° to 90 °, relative to a horizontal plane, against the bath surface.
- the bath surface corresponds essentially to this horizontal plane.
- Each gas jet is assigned a gas jet axis.
- the at least one gas jet is directed at a distance of the gas jet axis from the contact line of the bath surface with the casting roll and / or from the contact line of the bath surface with the side plate on the bath surface. This distance is preferably constant and is in a range between 10 mm and 50 mm and is measured on the bath surface.
- the at least one gas jet may be directed at the side plate surface at a distance from the line of contact of the bath surface with the side plate, and at least a partial stream of the gas jet is effectively deflected onto the bath surface.
- the gas jet or the gas jets are preferably designed as flat jets and emerge from a correspondingly shaped nozzle.
- a plurality of nozzles are arranged one behind the other, so that a contiguous narrow gas jet, similar to a gas meter, is generated.
- the at least one gas jet is formed as a partially curved flat jet.
- the gas jet After emerging from the gas jet nozzle, the gas jet diverges in the flow direction with an opening angle between 10 ° and 35 °.
- the divergent gas jet For the uniform and stable formation of a strand shell, it is necessary for the divergent gas jet to impinge entirely on the bath surface and not be directed in part onto the shell surface of the casting roll.
- the side plates which optionally perform an oscillation movement, a direct contact of the gas jet with the side plate is quite permissible, since disadvantageous influences, as in the lateral surfaces of the casting rolls, do not occur here.
- the at least one gas jet between the two side plates acts without interruption parallel or obliquely to the contact line of the bath surface with the casting roll on the bath surface. This ensures continuous shielding of the casting roll surface against contact with foreign particles.
- a continuous discharge of the particles to the side plates and thus in the edge zone of the cast metal strip is possible and desirable because the cast metal strip at least before winding in a downstream coiler undergoes trimming, which is not necessarily located within the actual two-roll caster, and thus Targeted enrichment with non-metallic inclusions in this area will not cause additional waste material.
- the at least one gas jet between the two casting rolls acts without interruption parallel to the contact line of the bath surface with the side plate on the bath surface.
- a corresponding shielding achieved.
- a further improvement in the containment of the foreign particles is achieved if at least sections of at least two gas jets act at a distance from one another on the bath surface. Especially along the line of contact between the casting roll shell surface and the bath surface, this measure has an improving effect on the strip surface quality.
- the two gas jets are arranged equidistant from each other.
- Components of the two-roll caster which form the melt space or are arranged directly therein, can be incorporated in the formation of the delimited surface area with gas jets.
- the delimited surface area is formed in sections of at least one gas jet and sections of sections of the side plates or the casting rolls or a Tauchg facedrohres or other installations.
- a gap-free bow wave ie a bulge extending parallel to the direction of extension of a flat jet on the bath surface, which at least partially encloses the delimited surface region, is formed by the at least one gas jet impinging on the metal bath at an angle.
- the bow wave may be self-contained and thus form this delimited surface area, or in conjunction with components of the two-roll caster, such as portions of the side plates or casting rolls or a Immersion pouring tube or other internals, form a delimited surface area.
- the bow wave formed by the gas jets is kept substantially constant at a height of 0.05 mm to 10 mm, preferably 0.1 mm to 3 mm, above the normal level of the bath surface. This creates a reservoir for the molten particles and keeps the particles there until a targeted discharge is carried out or automatically takes place at the end of the pouring.
- an inert or reducing gas is used so that reoxidation of the molten metal at the bath surface in this area does not occur.
- Argon, nitrogen, N + H2 or mixtures of at least two of these gases can be used as preferred gases.
- the method according to the invention should only be used in the starting phase of a casting process when an operating bath level has been reached and thus a substantial stabilization and settling of the molten metal in the melting space and in particular the bath surface has occurred. Therefore, the action of at least one gas jet on the bath surface during the starting phase of the casting process is suitably switched on only 10 seconds to 2 minutes after the beginning of the melt introduction into the melting chamber (casting start).
- a Zweiwalzengit adopted for producing a cast metal strip of the type described above with two rotationally driven casting rolls and adjacent to the end faces of the casting rolls side plates, which together form a melting space for receiving a melt bath with a bath surface and a casting gap proposed.
- At least one gas jet nozzle with an outlet opening for a directed gas jet is arranged in the melting space or in the melting space so that a delimited surface area is formed on the bath surface for the collection of foreign particles.
- a Zwealtzeng screen rose formed in such a way is characterized in that the outlet opening of the gas jet nozzle is directed at a distance from the line of contact of the bath surface with the casting roll on the bath surface, that the divergievende gas jet wholly incident on the bath surface and the distance of the directed onto the bath surface gas jet axis from the contact line of the bath surface with the casting roll is in a range of 10mm to 50mm measured on the bath surface.
- the melting chamber is protected from access of air at a distance above the bath surface by a cover hood.
- the cover is located on the side plates and the casting rolls with a contact surface or a seal or is kept adjusted in particular to the casting rolls to a narrow gap, wherein introduced into the melting chamber inert gas exits through these gaps and thus prevents the ingress of false air in this melt space.
- the gas jet nozzles protrude at least with their outlet openings through the cover in the melting space and are preferably attached to the cover and aligned.
- the orientation of the outlet opening of the gas jet nozzles determines the direction of the exiting gas jet.
- the orientation of the nozzle axis in the outlet cross section of the gas jet nozzle corresponds to the orientation of the gas jet axis of the gas jet in the cross section of the outlet opening. Since the outlet openings of the gas jet nozzle and thus the defined nozzle axis in the outlet opening of the gas jet nozzle are directed directly onto the bath surface, the drifting of foreign particles into unwanted zones of the bath surface is avoided.
- Favorable conditions for this are achieved if the distance of the gas jet axis directed onto the bath surface from the Contact line of the bath surface with the casting roll is in a range of 10 mm to 50 mm measured on the bath surface.
- the gas jet nozzle is designed as a flat jet nozzle or slot nozzle with a slot-shaped outlet opening.
- the outlet opening of the gas jet nozzle is directed at a distance from the contact line of the bath surface with the side plate directly on the bath surface.
- a beneficial effect occurs when the outlet of the gas jet nozzle between the two side plates, optionally leaving a distance to the side plates, parallel to the line of contact of the bath surface with the casting roll is directed to the bath surface.
- a local undercooling of the side plates under the action of a continuous gas jet is avoided when the outlet of the gas jet nozzle between the two casting rolls, optionally leaving a distance to the casting rolls, parallel to the contact line of the bath surface with the side plate is directed to the bath surface.
- Local undercooling of the casting roll surface is avoided if the outlet opening of the gas jet nozzle between the two casting rolls, optionally leaving a distance to the casting rolls, parallel to the contact line of the bath surface with the side plate on the bath surface.
- An improved shielding of the foreign particles is achieved when a gas jet nozzle with two, substantially equidistant outlet openings for directed gas jets is provided or two gas jets are each provided with an outlet opening, wherein the outlet openings are arranged so that on the Bath surface is formed a doubly delimited surface area for collection of foreign particles.
- a self-contained delimited area for the collection of molten foreign particles is achieved when the exit openings of at least one gas jet nozzle are aligned with the bath surface so as to form a delimited surface area on the bath surface under the action of gas jets.
- the outlet openings of at least one gas jet nozzle are aligned with the bath surface in such a way that they form a delimited surface area on the bath surface together with sections of the casting rolls or the side plates or other internals in the melt bath under the action of gas jets.
- FIG. 1 The principle underlying the method according to the invention is shown in FIG.
- a melting space 5 is formed, in which molten steel is fed, which is fed continuously via an immersion casting tube 6.
- the melt bath forms a bath surface 8, which extends between the two casting rolls 1, 2.
- strand shells 12 are formed, which fuse in the casting gap 7 to the metal strip 13.
- gas jet nozzles 16 are arranged, wherein the outlet openings 17, and whose nozzle axes 18 in the outlet cross section of the outlet opening 17 are directed obliquely against the bath surface 8.
- the exiting gas jets 20 with the gas jet axes 21 generate on the bath surface 8 a bow wave 24 of a certain height, which is substantially co-determined by the flow velocity of the gas jets and the impact pressure on the bath surface.
- the gas jet nozzles 16 are connected to supply lines 26, by which they are supplied with an inert or reducing gas. On the supply lines, which preferably form a loop, a plurality of gas jet nozzles are connected.
- the outlet opening 17 or the nozzle axis 18 of the gas jet nozzle 16 is directed onto the bath surface 8, so that the gas jets 20 directly onto the bath surface impinge and create a bow wave 24.
- the angle ⁇ is determined here from the casting roll side, as shown in FIG. 4.
- FIG. 5 shows the bath surface 8 between two casting rolls 1, 2 and two side plates 3, 4. Above the bath surface 8, gas jet nozzles 16 are positioned parallel to the casting rolls and parallel to the side plates and generate directional gas jets 20 against the bath surface 8. They border one a substantially rectangular delimited surface area 30 on the bath surface 8, in which collect the foreign particles.
- FIG. 6 illustrates a further advantageous embodiment for forming two delimited surface regions 30.
- Gas jet nozzles 16 are aligned here with an angular position to the casting rolls 1, 2 and accordingly form a bow wave oriented obliquely to the casting rolls.
- the immersion casting tube 6 immersed in the center of the melt bath is integrated into the formation of the delimited surface area 30 and delimits this surface area in a partial section.
- the approximately V-shaped configuration of the two delimited surface regions 30 allows the particular advantage of a continuous discharge of foreign particles to the side plates 3, 4 and thus in the outermost edge regions of the cast steel strip.
- FIG. 1 A possible embodiment for the integration of gas jet nozzles into the cover 9 which shields the melt bath from false air inlet is shown in FIG.
- the cover 9 is positioned with supports not shown above the bath surface 8 with a small distance to the casting roll surfaces 14, 15 between them.
- the cover 9 is provided with passages or peripheral recesses, of which only one such passage 31 is shown, in which a gas jet nozzle 16 is inserted and screwed to a console 32 of the cover 9.
- the gas jet nozzle 16 is as a slot or Flat jet nozzle formed with a slot-shaped outlet opening 17 and has a straight at least in the end region outlet channel 19.
- a very narrow, bundled and directed against the bath surface 8 gas jet 20 is generated, which forms the bow wave 24.
- FIG. 8 A further advantageous embodiment for forming a delimited surface region 25 is illustrated in FIG. 8.
- Gas jet nozzles 16 are arranged on all sides at a distance from the bath surface 8 and their edges to the casting rolls 1, 2 and the side plates 3, 4 and directed with their outlet openings on the bath surface. in a section along the delimited surface area along the casting roll longitudinal extent two rows of gas jet nozzles 16a, 16b, ... are aligned parallel to each other, the gas jets 20 a, 20 b, ..., which are shown in FIG. With the same effect and gas jet nozzles can be used with two outlet openings. In both cases, a double bow wave is generated.
- FIG. 9 shows a gas jet nozzle 16 with two outlet openings 17a, 17b and with outlet channels 19a, 19b diverging in the gas flow direction.
- the outlet channels can also run parallel to one another.
- the invention is not limited to the illustrated and described embodiments, but can be modified many times. It is also possible to arrange adjoining gas jets forming a defined surface area and the associated gas jet nozzles so that the gas jets are directed in a peripheral portion of the delimited surface area directly against the bath surface and in another portion of the G confusewalzenober Structure or side plates.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines gegossenen Metallbandes unter Verwendung von zwei Gießwalzen und zwei Seitenplatten, die gemeinsam einen Schmelzenraum und einen Gießspalt bilden, wobei Metallschmelze in den Schmelzenraum zugeführt wird, die im Schmelzenraum ein Schmelzenbad mit einer nach oben offenen Badoberfläche ausbildet und aus dem Schmelzenraum ein gegossenes Metallband durch den Gießspalt ausgefördert wird und auf der Badoberfläche unter Einwirkung von mindestens einem Gasstrahl ein abgegrenzter Oberflächenbereich zur Sammlung von schmelzenfremden Partikeln gebildet wird, sowie eine Zweiwalzengießeinrichtung hierzu.The invention relates to a method for producing a cast metal strip using two casting rolls and two side plates, which together form a melting space and a casting gap, wherein molten metal is fed into the melting space, which forms a melt bath with an open-up bath surface in the melting space and from a cast metal strip is conveyed through the casting gap to the melting space and a delimited surface area is formed on the bath surface under the action of at least one gas jet to collect particles foreign to the melt, and a two-roll casting device for this purpose.
Bevorzugt betrifft die Erfindung ein Gießverfahren zur Herstellung eines kontinuierlich gegossenen Stahlbandes mit einer Banddicke zwischen 0,5 mm und 10 mm unter Verwendung einer Zweiwalzengießanlage mit im Wesentlichen vertikal nach unten gerichteter Ausbringung des gegossenen Stahlbandes.Preferably, the invention relates to a casting method for producing a continuously cast steel strip having a strip thickness between 0.5 mm and 10 mm using a two-roll caster with substantially vertically downwardly directed application of the cast steel strip.
Eine Zweiwalzengießeinrichtung mit vertikaler Ausförderung eines Metallbandes ist allgemein bekannt und diese besteht, wie in den Fig. 1 und 2 schematisch dargestellt, aus zwei angetriebenen, gegensinnig rotierenden Gießwalzen 1, 2 und zwei Seitenplatten 3, 4, die vorzugsweise an den Stirnseiten der Gießwalzen an diese angestellt sind und so einen Schmelzenraum 5 zur Aufnahme von durch ein Tauchgießrohr 6 eingebrachter Metallschmelze bilden. Die beiden Drehachsen der Gießwalzen liegen in einer Horizontalebene und sind zueinander parallel in einem Abstand angeordnet, sodass zwischen den Gießwalzen ein Gießspalt 7 gebildet ist, der in seiner Längserstreckung von den Seitenplatten begrenzt ist und somit einen Querschnitt aufweist, der dem Querschnitt des gewünschten gegossenen Bandes entspricht. Mit der kontinuierlichen Zuführung von Metallschmelze in den Schmelzenraum bildet sich dort ein Schmelzenbad mit einer nach oben offenen Badoberfläche 8 aus. Oberhalb der Badoberfläche ist der Schmelzenraum mit einer Abdeckhaube 9 begrenzt, die dichtend oder unter Freilassung eines Spaltes an den Gießwalzen und Seitenplatten anliegt, um Falschluftzutritt weitgehend zu verhindern. Nach unten mündet der Schmelzenraum in den Gießspalt, aus dem das Metallband austritt. Bei laufender Rotation der Gießwalzen bilden sich, ausgehend von den Kontaktlinien 10, 11 der Badoberfläche mit den gekühlten Gießwalzen, an deren Manteloberflächen bei Eintritt in das Schmelzenbad zwei kontinuierlich stärker werdende Strangschalen 12 aus, die im Gießspalt zum Metallband 13 vereint werden.A Zweiwalzengießeinrichtung with vertical discharge of a metal strip is well known and this consists, as shown schematically in FIGS. 1 and 2, of two driven,
Bei der kontinuierlichen Zuführung von Metallschmelze in das Schmelzenbad durch das Tauchgießrohr, die eine Badbewegung im Schmelzenbad verursacht, werden schmelzenfremde, nichtmetallische Partikel eingeschleppt. Diese schwimmen an die Badoberfläche auf, wo sie, auch gemeinsam mit im Kokillenschmelzbad durch chemische Reaktion mit feuerfestem Material bzw. durch Reoxidation generierten schmelzenfremden Partikel, agglomerieren und vorwiegend an der Kontaktlinie zu den Gießwalzen direkt an der Gießwalzen-Manteloberfläche in die Strangschalen eingelagert werden und an der Oberfläche und im oberflächennahen Bereich des gegossenen Metallbandes Einschlüsse und Keime für Makro- und Mikrorisse bilden.In the continuous supply of molten metal into the melt bath through the submerged casting tube, which causes a bath movement in the melt bath, non-metallic, non-metallic particles are entrained. These float to the bath surface, where they are agglomerated, also together with melt-extruded particles generated in the mold melt bath by chemical reaction with refractory material or by reoxidation, and are stored mainly at the contact line with the casting rolls directly at the casting roll shell surface in the strand bowls and At the surface and in the near-surface area of the cast metal strip form inclusions and microcracks for macro and microcracks.
Eine Zweiwalzengießanlage und ein Gießverfahren zum Vergießen einer Metallschmelze entsprechend dem beschriebenen Stand der Technik ist beispielsweise bereits aus der JP-A 2001-314946, der WO 02/083343 und der JP-A 2-207946 bekannt.A two-roll caster and a casting method for potting a molten metal according to the described prior art is already known, for example, from JP-A 2001-314946, WO 02/083343 and JP-A 2-207946.
Um schmelzenfremde Partikel von der Kontaktlinie der Gießwalzenoberfläche mit der Badspiegeloberfläche fern zu halten, wird in der JP-A 2001-314946 vorgeschlagen, Gasstrahlen im Bereich dieser Kontaktlinie aufzubringen, die ein Abdriften der schmelzenfremden Partikel zur Mitte des Schmelzenpools bewirken. Die Gasstrahlen bestreichen einen Teil der Gießwalzenoberfläche und einen Randbereich der Badspiegeloberfläche, wobei es an der Gießwalzenoberfläche in einem sensiblen Bereich in Abhängigkeit von der Intensität und der Temperatur der Gasstrahlen zu Badschwankungen und Temperaturschwankungen kommt, die das Strangschalenwachstum beeinflussen. Weitgehend gleichmäßige Ausgangsbedingungen für die Strangschalenbildung in diesem Bereich sind jedoch für das Endprodukt besonders wichtig.In order to keep molten foreign particles away from the contact line of the casting roll surface with the bath mirror surface, it is proposed in JP-A 2001-314946 to apply gas jets in the region of this contact line which cause the extraneous particles to drift off to the center of the melt pool. The gas jets spread over a portion of the casting roll surface and an edge region of the bath mirror surface, causing bath sway and temperature variations on the casting surface in a sensitive region, depending on the intensity and temperature of the gas jets, which affect strand growth. However, largely uniform starting conditions for strand shell formation in this area are particularly important for the end product.
Nach der WO 02/083343 wird ein Abdriften von in das Schmelzenbad eingeschleppten schmelzenfremden Partikel zur Kontaktlinie des Metallbades mit den Manteloberflächen der Gießwalzen während des laufenden Gießbetriebes durch schräg in das Metallbad eintauchende Abschirmungen vermieden, deren Unterkanten unterhalb des Niveaus der Austrittsöffnungen des Tauchgießrohres positioniert sind. Damit soll im Schmelzenraum zusätzlich ein Schmelzenpool geschaffen werden, in dem eine Abscheidung der nichtmetallischen Partikel ermöglicht wird. Das mit der Zweiwalzengießeinrichtung kontinuierlich erzeugte Metallband wird zu Bunden gewickelt und jeweils am Ende des Wickelvorganges eines einzelnen Bundes werden die Abschirmungen aus dem Metallbad entfernt und die an der Badoberfläche abgeschiedenen Partikel mit Gasdüsen zu mindestens einer der Gießwalzenoberflächen geblasen und solcherart mit einem kurzen Stück des Metallbandes ausgefördert. Der wesentliche Nachteil dieses Verfahrens besteht darin, dass damit nach jedem gegossenen Bund ein Ausschussstück produziert wird, welches den kontinuierlichen Produktionsprozess unterbricht und die Ausschussrate der Produktion erhöht. Weiters lagert sich an den Abschirmungen Metallschmelze ab, die bei jedem Hochfahren der Abschirmung erstarrt. Sofern die Abschirmung aus feuerfestem Material besteht, werden zusätzlich erodierte Partikel des feuerfesten Materials in die Schmelze eingetragen, bzw. kommt es zu chemischen Reaktionen zwischen dem Flüssigstahl und dem feuerfesten Material, welche zusätzlich Verunreinigungen erzeugen.According to WO 02/083343, drifting of molten foreign particles entrained into the melt bath to the contact line of the metal bath with the mantle surfaces of the casting rolls during the current casting operation obliquely into the metal bath avoid immersion shields whose lower edges are positioned below the level of the outlet openings of the Tauchgießrohres. In addition, a melt pool is to be created in the melting space, in which a separation of the non-metallic particles is made possible. The metal strip continuously produced by the two-roll caster is wound into coils, and at each end of the winding process of a single collar, the shields are removed from the metal bath and the particles deposited on the bath surface are blown with gas nozzles to at least one of the casting roll surfaces and thus with a short piece of the metal strip discharged. The main disadvantage of this method is that it produces a piece of broke after each cast coil, which interrupts the continuous production process and increases the reject rate of production. Furthermore, molten metal deposits on the shields, which solidifies each time the shield is raised. If the shield consists of refractory material, additionally eroded particles of the refractory material are introduced into the melt, or it comes to chemical reactions between the liquid steel and the refractory material, which also produce impurities.
Aus der JP-A 2-207946 ist eine Zweiwalzengießeinrichtung bekannt, bei der die Entfernung der an der Badoberfläche aufschwimmenden Fremdpartikel durch kontinuierliches Abschöpfen mit umlaufenden Becherwerken erfolgt. Da diese Einrichtungen an der Badoberfläche bei Schmelztemperatur des Metalls arbeiten müssen, ist mit einer erhöhten Anzahl von Betriebsstörungen an diesen mechanischen Einrichtungen zu rechnen. Zusätzlich muss im Falle eines Stahlbades die Badoberfläche vor Kontakt mit Luftsauerstoff geschützt werden, sodass der Einsatz von derartigen Schöpfeinrichtungen unter diesen Bedingungen nicht realisierbar ist.From JP-A 2-207946 a Zweiwalzengießeinrichtung is known in which the removal of the floating on the surface of the bath foreign particles is carried out by continuous skimming with circulating bucket elevators. Since these devices have to work on the bath surface at the melting temperature of the metal, an increased number of malfunctions can be expected in these mechanical devices. In addition, in the case of a steel bath, the bath surface must be protected from contact with atmospheric oxygen, so that the use of such scooping devices under these conditions is not feasible.
Weilass ist aus der nachveröffentlichten WO 03/049888 A2 bereits bekannt, Gasstrahlen direkt auf die Badoberfläche aufzubringen, jedoch werden zum Ort der Aufbringung keine näheren Angaben gemacht.Weilass is already known from the postponed WO 03/049888 A2, apply gas jets directly on the bath surface, but no details are made to the place of application.
Aufgabe der vorliegenden Erfindung ist es daher, die Nachteile des beschriebenen Standes der Technik zu vermeiden und ein Verfahren zur Herstellung eines gegossenen Metallbandes und eine Zweiwalzengießeinrichtung vorzuschlagen, wobei der Eintrag von schmelzenfremden Partikeln an der bzw. in die Oberfläche oder in den oberflächennahen Bereich des gegossenen Bandes weitgehend vermieden wird, eine weitgehend störungsfreie und von einer Wellenbildung an der Badoberfläche abgegrenzte Kontaktlinie zwischen der Badoberfläche und der Gießwalzenmantelfläche erreicht und gleichzeitig ein Sauerstoffkontakt mit der Badoberfläche weitestgehend vermieden wird.The object of the present invention is therefore to avoid the disadvantages of the described prior art and to propose a method for producing a cast metal strip and a Zweiwalzengießeinrichtung, the entry of extraneous particles on or into the surface or in the near-surface region of the cast Bandes is largely avoided, reaches a largely trouble-free and delimited by a wave formation on the bath surface line of contact between the bath surface and the Gießwalzenmantelfläche while oxygen contact with the bath surface is largely avoided.
Diese Aufgabe wird ausgehend von einem Verfahren der eingangs genannten Art dadurch gelöst, dass der mindestens eine Gasstrahl in einem Abstand der Gasstrahlachse von der Kontaktlinie der Badoberfläche mit der Gießwalze von 10 mm bis 50 mm gemessen auf der Badoberfläche zur Gänze auf die Badoberfläche auftrifft.This object is achieved on the basis of a method of the type mentioned above in that the at least one gas jet impinges on the bath surface at a distance of the gas jet axis from the contact line of the bath surface with the casting roll of 10 mm to 50 mm as measured on the bath surface.
Hierbei ist der mindestens eine Gasstrahl so ausgeformt, dass entlang des abgegrenzten Oberflächenbereiches keine Lücken verbleiben, durch die schmelzenfremde Partikel austreten können. Generell kann der abgegrenzte Oberflächenbereich von einem einen geschlossenen Ring mit beliebiger Außenkontur bildenden Gasstrahl oder mehreren aufeinander abfolgenden Gasstrahlen gebildet werden. Gleichzeitig wird, insbesondere bei stark zu Oxidation neigenden Metallschmelzen, wie Stahl, oberhalb des Metallbades und innerhalb eines gegen Falschlufteintritt bestmöglich abgeschlossenen Schmelzenraumes eine inerte oder reduzierende Schutzgasatmosphäre erzeugt und aufrechterhalten, die eine Reoxidation der Metallschmelze praktisch ausschließt.In this case, the at least one gas jet is formed in such a way that no gaps remain along the delimited surface area, through which particles foreign to the melt can escape. In general, the delimited surface region can be formed by a gas jet forming a closed ring with an arbitrary outer contour or a plurality of successive gas jets. At the same time, an inert or reducing protective gas atmosphere is generated and maintained, which virtually precludes reoxidation of the molten metal, especially in the case of metal melts which are prone to oxidation, such as steel, above the metal bath and within a melt space which is sealed off as best as possible.
Der mindestens eine Gasstrahl ist direkt auf die Badoberfläche gerichtet. Damit wird ein ruhiger, von Wellenbildung an der Badoberfläche weitgehend unberührt bleibender Randstreifen zwischen dem Kontaktbereich des Gasstrahles mit der Badoberfläche und dem den Schmelzenraum begrenzenden Gießwalzen und/oder Seitenplatten erreicht. Diese Maßnahme unterstützt in hohem Maße eine gleichbleibend gleichmäßige und ungestörte Strangschalenbildung an den Manteloberflächen der entsprechend der Gießgeschwindigkeit rotierenden Gießwalzen, falls auch die Gießwalzenoberflächen optimal stabil, homogen gleichmäßig laufen und funktionieren.The at least one gas jet is directed directly at the bath surface. This achieves a quiet edge strip, which remains largely untouched by wave formation on the bath surface, between the contact region of the gas jet with the bath surface and the casting rolls and / or side plates delimiting the melt space. This measure greatly supports a consistently uniform and undisturbed strand shell formation on the mantle surfaces of the casting rolls rotating in accordance with the casting speed, provided that the casting roll surfaces run optimally stable, homogeneously uniformly and function.
Besonders zweckmäßig ist hierbei, wenn der mindestens eine Gasstrahl unter einem Winkel von 25° bis 145°, vorzugsweise unter einem Winkel von 35° bis 90°, bezogen auf eine Horizontalebene, gegen die Badoberfläche gerichtet ist. Hierbei entspricht die Badoberfläche im Wesentlichen dieser Horizontalebene.It is particularly expedient in this case if the at least one gas jet is directed at an angle of 25 ° to 145 °, preferably at an angle of 35 ° to 90 °, relative to a horizontal plane, against the bath surface. Here, the bath surface corresponds essentially to this horizontal plane.
Jedem Gasstrahl ist eine Gasstrahlachse zugeordnet. Vorzugsweise ist der mindestens eine Gasstrahl in einem Abstand der Gasstrahlachse von der Kontaktlinie der Badoberfläche mit der Gießwalze und/oder von der Kontaktlinie der Badoberfläche mit der Seitenplatte auf die Badoberfläche gerichtet. Dieser Abstand ist vorzugsweise konstant und liegt in einem Bereich zwischen 10 mm und 50 mm und ist auf der Badoberfläche gemessen.Each gas jet is assigned a gas jet axis. Preferably, the at least one gas jet is directed at a distance of the gas jet axis from the contact line of the bath surface with the casting roll and / or from the contact line of the bath surface with the side plate on the bath surface. This distance is preferably constant and is in a range between 10 mm and 50 mm and is measured on the bath surface.
Da die Seitenplatten im Gegensatz zu den rotierenden Gießwalzen im Wesentlichen stationär sind, kann der mindestens eine Gasstrahl in einem Abstand von der Kontaktlinie der Badoberfläche mit der Seitenplatte auf die Seitenplattenoberfläche gerichtet sein und mindestens ein Teilstrom des Gasstrahles wird auf die Badoberfläche wirksam umgelenkt.Since the side plates are substantially stationary in contrast to the rotating casting rolls, the at least one gas jet may be directed at the side plate surface at a distance from the line of contact of the bath surface with the side plate, and at least a partial stream of the gas jet is effectively deflected onto the bath surface.
Der Gasstrahl oder die Gasstrahlen sind vorzugsweise als Flachstrahlen ausgebildet und treten aus einer entsprechend geformten Düse aus. Zweckmäßig sind eine Vielzahl von Düsen hintereinander angeordnet, sodass ein zusammenhängender schmaler Gasstrahl, ähnlich wie bei einem Gasmesser, erzeugt wird.The gas jet or the gas jets are preferably designed as flat jets and emerge from a correspondingly shaped nozzle. Suitably, a plurality of nozzles are arranged one behind the other, so that a contiguous narrow gas jet, similar to a gas meter, is generated.
Zur Ausbildung eines beliebig geformten abgegrenzten Oberflächenbereiches auf der Badoberfläche ist der mindestens eine Gasstrahl als teilweise gekrümmter Flachstrahl ausgebildet.To form an arbitrarily shaped delimited surface area on the bath surface, the at least one gas jet is formed as a partially curved flat jet.
Nach dem Austritt aus der Gasstrahldüse divergiert der Gasstrahl in Strömungsrichtung mit einem Öffnungswinkel zwischen 10° und 35°. Für die gleichmäßige und stabile Ausbildung einer Strangschale ist es notwendig, dass der divergierende Gasstrahl zur Gänze auf die Badoberfläche auftrifft und nicht teilweise auf die Mantelfläche der Gießwalze gerichtet ist. Bei den Seitenplatten, die gegebenenfalls eine Oszillationsbewegung durchführen, ist ein direkter Kontakt des Gasstrahles mit der Seitenplatte durchaus zulässig, da nachteilige Einflüsse, wie bei den Mantelflächen der Gießwalzen, hier nicht auftreten.After emerging from the gas jet nozzle, the gas jet diverges in the flow direction with an opening angle between 10 ° and 35 °. For the uniform and stable formation of a strand shell, it is necessary for the divergent gas jet to impinge entirely on the bath surface and not be directed in part onto the shell surface of the casting roll. In the case of the side plates, which optionally perform an oscillation movement, a direct contact of the gas jet with the side plate is quite permissible, since disadvantageous influences, as in the lateral surfaces of the casting rolls, do not occur here.
Nach einer bevorzugten Ausführungsform wirkt der mindestens eine Gasstrahl zwischen den beiden Seitenplatten, gegebenenfalls unter Freilassung eines Abstandes zu den Seitenplatten, ohne Unterbrechung parallel oder schräg zur Kontaktlinie der Badoberfläche mit der Gießwalze auf die Badoberfläche ein. Damit wird eine durchgehende Abschirmung der Gießwalzenoberfläche gegen Kontakt mit schmelzenfremden Partikeln sichergestellt. Eine kontinuierliche Ableitung der Partikel zu den Seitenplatten und damit in die Randzone des gegossenen Metallbandes ist möglich und auch erwünscht, da das gegossene Metallband zumindest vor dem Aufwickeln in einer nachgeordneten Haspelanlage eine Besäumung durchläuft, die nicht notwendigerweise innerhalb der eigentlichen Zweiwalzengießanlage angeordnet ist, und damit eine gezielte Anreicherung mit nichtmetallischen Einschlüssen in diesem Bereich kein zusätzliches Ausschussmaterial verursachen. Eine schräg zur Kontaktlinie der Badoberfläche mit der Gießwalze verlaufende Anordnung des Gasstrahles fördert eine kontinuierliche Ableitung von schmelzenfremden Partikeln zu den Seitenplatten zusätzlich. Darüber hinaus wird mit der Freilassung eines Abstandes zu den Seitenplatten eine örtliche Abkühlung einer räumlich beschränkten Zone an den Seitenplatten durch die Gasstrahlen vermieden.According to a preferred embodiment, the at least one gas jet between the two side plates, optionally leaving a gap to the side plates, acts without interruption parallel or obliquely to the contact line of the bath surface with the casting roll on the bath surface. This ensures continuous shielding of the casting roll surface against contact with foreign particles. A continuous discharge of the particles to the side plates and thus in the edge zone of the cast metal strip is possible and desirable because the cast metal strip at least before winding in a downstream coiler undergoes trimming, which is not necessarily located within the actual two-roll caster, and thus Targeted enrichment with non-metallic inclusions in this area will not cause additional waste material. An obliquely to the contact line of the bath surface with the casting roll extending arrangement of the gas jet promotes a continuous discharge of extraneous particles to the side plates in addition. In addition, with the release of a distance to the side plates, a local cooling of a spatially limited zone on the side plates by the gas jets is avoided.
Gleichermaßen wirkt der mindestens eine Gasstrahl zwischen den beiden Gießwalzen, gegebenenfalls unter Freilassung eines Abstandes zu den Gießwalzen, ohne Unterbrechung parallel zur Kontaktlinie der Badoberfläche mit der Seitenplatte auf die Badoberfläche ein. Damit wird, sofern während des laufenden Gießbetriebes auch an den Metallbandrändern keine Anreicherung schmelzenfremder Partikel erwünscht ist, eine entsprechende Abschirmung erreicht. Mit der Freilassung eines Abstandes zu den Gießwalzen wird eine örtliche Abkühlung auf dem Gießwalzenmantel entlang eines Umfangsstreifens und damit ein unterschiedlich starkes Strangschalenwachstum entlang der Kontaktlinie zwischen der Gießwalzenmantelfläche und der Badoberfläche vermieden.Similarly, the at least one gas jet between the two casting rolls, optionally leaving a distance to the casting rolls, acts without interruption parallel to the contact line of the bath surface with the side plate on the bath surface. Thus, unless during the current casting operation on the metal strip edges no accumulation of molten particles is desired, a corresponding shielding achieved. With the release of a distance to the casting rolls a local cooling on the Gießwalzenmantel along a circumferential strip and thus a different strong strand shell growth along the line of contact between the casting roll shell surface and the bath surface is avoided.
Eine weitere Verbesserung in der Eingrenzung der schmelzenfremden Partikel wird erreicht, wenn zumindest abschnittsweise mindestens zwei Gasstrahlen in einem Abstand voneinander auf die Badoberfläche einwirken. Speziell entlang der Kontaktlinie zwischen der Gießwalzenmantelfläche und der Badoberfläche wirkt sich diese Maßnahme verbessernd auf die Bandoberflächenqualität aus. Vorzugsweise sind die beiden Gasstrahlen zueinander äquidistant angeordnet.A further improvement in the containment of the foreign particles is achieved if at least sections of at least two gas jets act at a distance from one another on the bath surface. Especially along the line of contact between the casting roll shell surface and the bath surface, this measure has an improving effect on the strip surface quality. Preferably, the two gas jets are arranged equidistant from each other.
Bauteile der Zweiwalzengießeinrichtung, die den Schmelzenraum bilden oder darin unmittelbar angeordnet sind, können bei der Bildung des abgegrenzten Oberflächenbereiches mit Gasstrahlen eingebunden werden. Hierbei wird der abgegrenzte Oberflächenbereich abschnittsweise von mindestens einem Gasstrahl und abschnittsweise von Abschnitten der Seitenplatten oder der Gießwalzen oder eines Tauchgießrohres oder sonstiger Einbauten gebildet.Components of the two-roll caster, which form the melt space or are arranged directly therein, can be incorporated in the formation of the delimited surface area with gas jets. Here, the delimited surface area is formed in sections of at least one gas jet and sections of sections of the side plates or the casting rolls or a Tauchgießrohres or other installations.
Vorzugsweise wird von dem auf das Metallbad unter einem Winkel auftreffenden mindestens einem Gasstrahl eine lückenfreie Bugwelle, d.h. eine sich parallel zur Erstreckungsrichtung eines Flachstrahles erstreckende Aufwölbung an der Badoberfläche gebildet, die den abgegrenzten Oberflächenbereich zumindest abschnittsweise einschließt. Die Bugwelle kann in sich geschlossen sein und solcherart diesen abgegrenzten Oberflächenbereich bilden, oder in Verbindung mit Bauteilen der ZweiwalzenGießeinrichtung, wie Abschnitte der Seitenplatten oder der Gießwalzen oder eines Tauchgießrohres oder sonstiger Einbauten, einen abgegrenzten Oberflächenbereich bilden.Preferably, a gap-free bow wave, ie a bulge extending parallel to the direction of extension of a flat jet on the bath surface, which at least partially encloses the delimited surface region, is formed by the at least one gas jet impinging on the metal bath at an angle. The bow wave may be self-contained and thus form this delimited surface area, or in conjunction with components of the two-roll caster, such as portions of the side plates or casting rolls or a Immersion pouring tube or other internals, form a delimited surface area.
Die von den Gasstrahlen gebildete Bugwelle wird weitgehend konstant auf einer Höhe von 0,05 mm bis 10 mm, vorzugsweise von 0,1 mm bis 3 mm, über dem Badoberflächen-Normalniveau gehalten. Damit wird ein Sammelbecken für die schmelzenfremden Partikel geschaffen und die Partikel dort gehalten bis eine gezielte Ableitung durchgeführt wird oder bei Gießende automatisch erfolgt.The bow wave formed by the gas jets is kept substantially constant at a height of 0.05 mm to 10 mm, preferably 0.1 mm to 3 mm, above the normal level of the bath surface. This creates a reservoir for the molten particles and keeps the particles there until a targeted discharge is carried out or automatically takes place at the end of the pouring.
Zur Ausbildung des Gasstrahles wird ein inertes oder reduzierendes Gas verwendet, damit eine Reoxidation der Metallschmelze an der Badoberfläche in diesem Bereich gesichert nicht auftritt. Als bevorzugte Gase sind Argon, Stickstoff, N + H2 oder Gemische von mindestens zweien dieser Gase einsetzbar.To form the gas jet, an inert or reducing gas is used so that reoxidation of the molten metal at the bath surface in this area does not occur. Argon, nitrogen, N + H2 or mixtures of at least two of these gases can be used as preferred gases.
Das erfindungsgemäße Verfahren soll in der Startphase eines Gießprozesses erst eingesetzt werden, wenn eine Betriebsbadspiegelhöhe erreicht ist und damit eine weitgehende Stabilisierung und Beruhigung der Metallschmelze im Schmelzenraum und insbesondere der Badoberfläche eingetreten ist. Daher wird die Einwirkung von mindestens einem Gasstrahl auf die Badoberfläche während der Startphase des Gießprozesses zweckmäßig erst 10 sec bis 2 min nach Beginn der Schmelzeneinbringung in den Schmelzenraum (Gießbeginn) zugeschaltet.The method according to the invention should only be used in the starting phase of a casting process when an operating bath level has been reached and thus a substantial stabilization and settling of the molten metal in the melting space and in particular the bath surface has occurred. Therefore, the action of at least one gas jet on the bath surface during the starting phase of the casting process is suitably switched on only 10 seconds to 2 minutes after the beginning of the melt introduction into the melting chamber (casting start).
Über eine längere Gießperiode sammeln sich schmelzenfremde Partikel im abgegrenzten Oberflächenbereich an, die zumindest in periodischen Abständen entfernt werden müssen. Dies erfolgt bevorzugt während betriebsbedingter Produktionsunterbrechungen, bei denen der Schmelzenraum an sich zur Gänze entleert und nachfolgend ein neuer Anlagenstart und Gießbeginn eingeleitet wird. Wenn diese Zeitintervalle zu groß sind, wird zur Ableitung angesammelter schmelzenfremder Partikel aus einem abgegrenzten Oberflächenbereich die Einwirkung mindestens eines Gasstrahles auf die Badoberfläche in einem Zeitintervall abschnittsweise unterbrochen. Dies wird erreicht, indem die Einwirkung mindestens eines Gasstrahles auf die Badoberfläche entweder entlang der Kontaktlinie der Badoberfläche mit mindestens einer der beiden Gießwalzen oder entlang der Kontaktlinie der Badoberfläche mit mindestens einer der beiden Seitenplatten, vorzugsweise entlang der Kontaktlinie mit beiden Seitenplatten, unterbrochen wird. Durch die Ableitung schmelzenfremder Partikel zu den Seitenwänden und damit in den Randbereich des gegossenen Metallbandes wird die Bildung von oberflächennahen Einschlüssen an den Breitseiten des Metallbandes vermieden und dieser verstärkt Einschlüsse aufweisende Randstreifen wird im Zuge der Bandbesäumung, die innerhalb eines nachgeschalteten Prozessschrittes stattfindet, entfernt. Die Ableitung von schmelzenfremden Partikeln über die Kontaktfläche der Gießwalzen mit der Metallschmelze im Schmelzenraum erfolgt zweckmäßig in einem Zeitintervall unmittelbar nach Erreichen des Bundgewichtes des gegossenen Metallbandes.Over a longer casting period, foreign particles accumulate in the delimited surface area, which must be removed at least at periodic intervals. This is preferably done during operational production interruptions, in which the melting space is completely emptied per se and subsequently a new plant start and casting start is initiated. If these time intervals are too large, the action of at least one gas jet on the bath surface is interrupted in sections in a time interval in order to discharge accumulated molten foreign particles from a delimited surface area. This is achieved by interrupting the action of at least one gas jet on the bath surface either along the line of contact of the bath surface with at least one of the two casting rolls or along the contact line of the bath surface with at least one of the two side plates, preferably along the line of contact with both side plates. By the derivation of molten foreign particles to the side walls and thus in the edge region of the cast metal strip, the formation of near-surface inclusions on the broad sides of the metal strip avoided and this reinforced inclusions having edge strips is removed in the course of Bandbesäumung, which takes place within a downstream process step. The discharge of molten foreign particles over the contact surface of the casting rolls with the molten metal in the melt space is expediently carried out in a time interval immediately after reaching the bundle weight of the cast metal strip.
Weiters wird eine Zweiwalzengießeinrichtung zur Herstellung eines gegossenen Metallbandes der eingangs beschriebenen Gattung mit zwei drehangetriebenen Gießwalzen und an den Stirnseiten der Gießwalzen anliegenden Seitenplatten, die gemeinsam einen Schmelzenraum zur Aufnahme eines Schmelzenbades mit einer Badoberfläche und einen Gießspalt bilden, vorgeschlagen. Im Schmelzenraum oder in den Schmelzenraum gerichtet bzw. ragend ist mindestens eine Gasstrahldüse mit einer Austrittsöffnung für einen gerichteten Gasstrahl so angeordnet, dass auf der Badoberfläche ein abgegrenzter Oberflächenbereich zur Sammlung von schmelzenfremden Partikeln gebildet ist. Eine solcherart ausgebildete Zweiwalzengießeinrichtung ist dadurch gekennzeichnet, dass die Austrittsöffnung der Gasstrahldüse derart in einem Abstand von der Kontaktlinie der Badoberfläche mit der Gießwalze auf die Badoberfläche gerichtet ist, dass der divergievende Gasstrahl zur Gänze auf die Badoberfläche auftrifft und der Abstand der auf die Badoberfläche gerichteten Gasstrahlachse von der Kontaktlinie der Badoberfläche mit der Gießwalze in einem Bereich von 10mm bis 50mm gemessen auf der Badoberfläche liegt.Furthermore, a Zweiwalzengießeinrichtung for producing a cast metal strip of the type described above with two rotationally driven casting rolls and adjacent to the end faces of the casting rolls side plates, which together form a melting space for receiving a melt bath with a bath surface and a casting gap proposed. At least one gas jet nozzle with an outlet opening for a directed gas jet is arranged in the melting space or in the melting space so that a delimited surface area is formed on the bath surface for the collection of foreign particles. A Zwealtzengießeinrichtung formed in such a way is characterized in that the outlet opening of the gas jet nozzle is directed at a distance from the line of contact of the bath surface with the casting roll on the bath surface, that the divergievende gas jet wholly incident on the bath surface and the distance of the directed onto the bath surface gas jet axis from the contact line of the bath surface with the casting roll is in a range of 10mm to 50mm measured on the bath surface.
Der Schmelzenraum ist in einem Abstand oberhalb der Badoberfläche durch eine Abdeckhaube vor Luftzutritt geschützt. Die Abdeckhaube liegt an den Seitenplatten und den Gießwalzen mit einer Kontaktfläche oder einer Dichtung auf oder ist insbesondere zu den Gießwalzen auf einen engen Spalt eingestellt gehalten, wobei in den Schmelzenraum eingebrachtes Schutzgas durch diese Spalte austritt und solcherart den Zutritt von Falschluft in diesen Schmelzenraum verhindert. Die Gasstrahldüsen ragen zumindest mit ihren Austrittsöffnungen durch die Abdeckhaube in den Schmelzenraum und sind vorzugsweise an der Abdeckhaube befestigt und ausgerichtet.The melting chamber is protected from access of air at a distance above the bath surface by a cover hood. The cover is located on the side plates and the casting rolls with a contact surface or a seal or is kept adjusted in particular to the casting rolls to a narrow gap, wherein introduced into the melting chamber inert gas exits through these gaps and thus prevents the ingress of false air in this melt space. The gas jet nozzles protrude at least with their outlet openings through the cover in the melting space and are preferably attached to the cover and aligned.
Generell bestimmt die Ausrichtung der Austrittsöffnung der Gasstrahldüsen die Richtung des austretenden Gasstrahles. Insofern entspricht die Ausrichtung der Düsenachse im Austrittsquerschnitt der Gasstrahldüse der Ausrichtung der Gasstrahlachse des Gasstrahles im Querschnitt der Austrittsöffnung. Da die Austrittsöffnungen der Gasstrahldüse und damit die definierte Düsenachse in der Austrittsöffnung der Gasstrahldüse direkt auf die Badoberfläche gerichtet sind, wird das Abdriften vom schmelzenfremden Partikeln in unerwünschte Zonen der Badoberfläche vermieden. Günstige Bedingungen hierfür werden erreicht, wenn der Abstand der auf die Badoberfläche gerichtete Gasstrahlachse von der Kontaktlinie der Badoberfläche mit der Gießwalze in einem Bereich von 10 mm bis 50 mm gemessen auf der Badoberfläche liegt. Günstige Bedingungen ergeben sich ebenfalls, wenn die Austrittsöffnung der Gasstrahldüse bzw. die Düsenachse im Austrittsquerschnitt der Austrittsöffnung unter einem Winkel von 25° bis 145°, vorzugsweise unter einem Winkel von 35° bis 90°, bezogen auf eine Horizontalebene, gegen die Badoberfläche gerichtet ist. Die Badoberfläche bildet hierbei die Horizontalebene aus.In general, the orientation of the outlet opening of the gas jet nozzles determines the direction of the exiting gas jet. In this respect, the orientation of the nozzle axis in the outlet cross section of the gas jet nozzle corresponds to the orientation of the gas jet axis of the gas jet in the cross section of the outlet opening. Since the outlet openings of the gas jet nozzle and thus the defined nozzle axis in the outlet opening of the gas jet nozzle are directed directly onto the bath surface, the drifting of foreign particles into unwanted zones of the bath surface is avoided. Favorable conditions for this are achieved if the distance of the gas jet axis directed onto the bath surface from the Contact line of the bath surface with the casting roll is in a range of 10 mm to 50 mm measured on the bath surface. Favorable conditions also arise when the outlet opening of the gas jet nozzle or the nozzle axis in the outlet cross section of the outlet opening is directed against the bath surface at an angle of 25 ° to 145 °, preferably at an angle of 35 ° to 90 °, relative to a horizontal plane , The bath surface forms the horizontal plane.
Zur Erzeugung eines sehr schmalen aber langgestreckten Gasstrahles ist die Gasstrahldüse als Flachstrahldüse oder Schlitzdüse mit einer schlitzförmigen Austrittsöffnung ausgestaltet. Durch die Aneinanderreihung mehrerer derartiger Gasstrahldüsen kann ein beliebig geformter abgegrenzter Bereich auf der Badoberfläche mit Gasstrahlen eingeschlossen werden.To produce a very narrow but elongated gas jet, the gas jet nozzle is designed as a flat jet nozzle or slot nozzle with a slot-shaped outlet opening. By juxtaposing a plurality of such gas jet nozzles, an arbitrarily shaped delimited area can be enclosed on the bath surface with gas jets.
Zweckmäßig ist die Austrittsöffnung der Gasstrahldüse in einem Abstand von der Kontaktlinie der Badoberfläche mit der Seitenplatte direkt auf die Badoberfläche gerichtet.Suitably, the outlet opening of the gas jet nozzle is directed at a distance from the contact line of the bath surface with the side plate directly on the bath surface.
Ein günstiger Effekt tritt auf, wenn die Austrittsöffnung der Gasstrahldüse zwischen den beiden Seitenplatten, gegebenenfalls unter Freilassung eines Abstandes zu den Seitenplatten, parallel zur Kontaktlinie der Badoberfläche mit der Gießwalze auf die Badoberfläche gerichtet ist.A beneficial effect occurs when the outlet of the gas jet nozzle between the two side plates, optionally leaving a distance to the side plates, parallel to the line of contact of the bath surface with the casting roll is directed to the bath surface.
Eine örtliche Unterkühlung an den Seitenplatten unter Einwirkung eines kontinuierlichen Gasstrahles wird vermieden, wenn die Austrittsöffnung der Gasstrahldüse zwischen den beiden Gießwalzen, gegebenenfalls unter Freilassung eines Abstandes zu den Gießwalzen, parallel zur Kontaktlinie der Badoberfläche mit der Seitenplatte auf die Badoberfläche gerichtet ist. Örtliche Unterkühlungen an der Gießwalzenoberfläche werden vermieden, wenn die Austrittsöffnung der Gasstrahldüse zwischen den beiden Gießwalzen, gegebenenfalls unter Freilassung eines Abstandes zu den Gießwalzen, parallel zur Kontaktlinie der Badoberfläche mit der Seitenplatte auf die Badoberfläche gerichtet ist.A local undercooling of the side plates under the action of a continuous gas jet is avoided when the outlet of the gas jet nozzle between the two casting rolls, optionally leaving a distance to the casting rolls, parallel to the contact line of the bath surface with the side plate is directed to the bath surface. Local undercooling of the casting roll surface is avoided if the outlet opening of the gas jet nozzle between the two casting rolls, optionally leaving a distance to the casting rolls, parallel to the contact line of the bath surface with the side plate on the bath surface.
Eine verbesserte Abschirmung der schmelzenfremden Partikel wird erreicht, wenn eine Gasstrahldüse mit zwei, im wesentlichen äquidistante Austrittsöffnungen für gerichtete Gasstrahlen ausgestattet ist oder zwei Gasstrahldüsen mit jeweils einer Austrittsöffnung vorgesehen sind, wobei die Austrittsöffnungen so angeordnet sind, dass auf der Badoberfläche ein zweifach abgegrenzter Oberflächenbereich zur Sammlung von schmelzenfremden Partikeln gebildet ist.An improved shielding of the foreign particles is achieved when a gas jet nozzle with two, substantially equidistant outlet openings for directed gas jets is provided or two gas jets are each provided with an outlet opening, wherein the outlet openings are arranged so that on the Bath surface is formed a doubly delimited surface area for collection of foreign particles.
Ein in sich geschlossener abgegrenzter Bereich für die Sammlung schmelzenfremder Partikel wird erreicht, wenn die Austrittsöffnungen mindestens einer Gasstrahldüse so auf die Badoberfläche ausgerichtet ist, dass sie unter der Einwirkung von Gasstrahlen einen abgegrenzten Oberflächenbereiches auf der Badoberfläche bilden. Dies ist aber auch möglich, wenn die Austrittsöffnungen mindestens einer Gasstrahldüse so auf die Badoberfläche ausgerichtet sind, dass sie zusammen mit Abschnitten der Gießwalzen oder der Seitenplatten oder sonstiger Einbauten im Schmelzenbad unter der Einwirkung von Gasstrahlen in Abfolge einen abgegrenzten Oberflächenbereiches auf der Badoberfläche bilden.A self-contained delimited area for the collection of molten foreign particles is achieved when the exit openings of at least one gas jet nozzle are aligned with the bath surface so as to form a delimited surface area on the bath surface under the action of gas jets. However, this is also possible if the outlet openings of at least one gas jet nozzle are aligned with the bath surface in such a way that they form a delimited surface area on the bath surface together with sections of the casting rolls or the side plates or other internals in the melt bath under the action of gas jets.
Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung nicht einschränkender Ausführungsbeispiele, wobei auf die beigefügten Figuren Bezug genommen wird, die folgendes zeigen:
- Fig. 1
- eine Zweiwalzengießeinrichtung nach dem Stand der Technik in einem Querschnitt durch die Gießwalzen,
- Fig. 2
- eine Zweiwalzengießeinrichtung nach dem Stand der Technik in einer Draufsicht,
- Fig. 3
- eine Zweiwalzengießeinrichtung mit den erfindungsgemäßen Gießdüsen bzw. erfindungsgemäß ausgerichteten Gasstrahlen,
- Fig. 4
- die Gasstrahldüsen- und Gasstrahlorientierung auf die Badoberfläche nach einer Ausführungsform der Erfindung,
- Fig. 5
- die Ausbildung eines abgegrenzten Oberflächenbereiches auf der Badoberfläche nach einer erfindungsgemäßen Ausführungsform,
- Fig. 6
- die Ausbildung eines abgegrenzten Oberflächenbereiches auf der Badoberfläche nach einer weiteren Ausführungsform,
- Fig. 7
- die Gasstrahldüseneinbindung in die Abdeckhaube
- Fig. 8
- die Anordnung eines abgegrenzten Oberflächenbereiches auf der Badoberfläche mit doppelten Gasstrahlen,
- Fig. 9
- eine Gasstrahldüse mit zwei Austrittsöffnungen.
- Fig. 1
- a two-roll caster according to the prior art in a cross section through the casting rolls,
- Fig. 2
- a two-roll caster according to the prior art in a plan view,
- Fig. 3
- a two-roll caster with the pouring nozzles according to the invention or gas streams aligned according to the invention,
- Fig. 4
- the gas jet and gas jet orientation on the bath surface according to an embodiment of the invention,
- Fig. 5
- the formation of a delimited surface area on the bath surface according to an embodiment of the invention,
- Fig. 6
- the formation of a delimited surface area on the bath surface according to a further embodiment,
- Fig. 7
- the gas jet nozzle integration in the cover
- Fig. 8
- the arrangement of a delimited surface area on the bath surface with double gas jets,
- Fig. 9
- a gas jet nozzle with two outlet openings.
Eine Zweiwalzengießeinrichtung mit ihrem grundlegenden Aufbau wurde unter Bezugnahme auf die Fig. 1 und 2 bereits in der Darstellung des Standes der Technik beschrieben. Die bereits dort für bestimmte Bauteile eingeführten Bezugszeichen werden im Weiteren für gleiche Bauteile entsprechend verwendet. Zweiwalzengießeinrichtungen werden für die kontinuierliche Herstellung von stranggegossenen Stahlbändern eingesetzt.A Zweiwalzengießeinrichtung with its basic structure has been described with reference to Figs. 1 and 2 already in the representation of the prior art described. The reference numbers already introduced there for certain components are subsequently used accordingly for the same components. Two-roll casters are used for the continuous production of continuously cast steel strips.
Insbesondere bei Rostfreigüten werden besonders hohe Anforderungen an die Oberflächenqualität der erzeugten Bänder gestellt, da bereits kleine Einschlüsse von Fremdstoffen, wie Schlacken, Metalloxide und ähnliches, an der Oberfläche oder im oberflächennahen Bereich Keimzellen für Mikro- und Makrorisse bilden und merkbare Beeinträchtigungen der Oberflächenbeschaffenheit auftreten.Particularly in the case of stainless grades, particularly high demands are placed on the surface quality of the strips produced, since even small inclusions of foreign substances, such as slags, metal oxides and the like, form germ cells for micro- and macrocracks on the surface or in the near-surface region and appreciable impairments of the surface quality occur.
Das dem erfindungsgemäßen Verfahren zugrunde liegende Prinzip ist in Fig. 3 dargestellt. Zwischen zwei in Pfeilrichtung rotierenden Gießwalzen 1, 2 und stirnseitig anliegenden Seitenplatten 3, von denen in der Schnittdarstellung nur eine dargestellt ist, ist ein Schmelzenraum 5 gebildet, in dem sich Stahlschmelze befindet, die über ein Tauchgießrohr 6 kontinuierlich zugeführt wird. Das Schmelzenbad bildet eine Badoberfläche 8 aus, die sich zwischen den beiden Gießwalzen 1, 2 erstreckt. Von den Kontaktlinien 10, 11 der Badoberfläche 8 mit den Gießwalzenoberflächen 14, 15 der innengekühlten Gießwalzen 1, 2 ausgehend, werden Strangschalen 12 gebildet, die im Gießspalt 7 zum Metallband 13 verschmelzen.The principle underlying the method according to the invention is shown in FIG. Between two casting rolls 1, 2 which rotate in the direction of the arrow and only one
Im Abstand von der Badoberfläche 8 sind Gasstrahldüsen 16 angeordnet, wobei deren Austrittsöffnungen 17, bzw. deren Düsenachsen 18 im Austrittsquerschnitt der Austrittsöffnung 17 schräg gegen die Badoberfläche 8 gerichtet sind. Die austretenden Gasstrahlen 20 mit den Gasstrahlachsen 21 erzeugen auf der Badoberfläche 8 eine Bugwelle 24 bestimmter Höhe, die von der Strömungsgeschwindigkeit der Gasstrahlen und dem Auftreffdruck auf die Badoberfläche wesentlich mitbestimmt wird. Zwischen gegenüberliegenden Bugwellen 24 oder innerhalb des von einer Bugwelle abgegrenzter Oberflächenbereiches 30 sammeln sich aus dem Schmelzenbad aufschwimmende schmelzenfremde Partikel. Die Gasstrahldüsen 16 sind an Versorgungsleitungen 26 angeschlossen, durch die sie mit einem inerten oder reduzierenden Gas versorgt werden. An den Versorgungsleitungen, die vorzugsweise eine Ringleitung bilden, sind eine Vielzahl von Gasstrahldüsen angeschlossen.At a distance from the
In Fig. 4 ist die Austrittsöffnung 17 bzw. die Düsenachse 18 der Gasstrahldüse 16 auf die Badoberfläche 8 gerichtet, sodass die Gasstrahlen 20 direkt auf die Badoberfläche auftreffen und eine Bugwelle 24 erzeugen. Hierbei ist die Austrittsöffnung 17, bzw. sind die Gasstrahlen 20 oder die Gasstrahlachsen 21 unter einem Winkel α gegen die Badoberfläche 8, die eine Horizontalebene E definiert, gerichtet, der zwischen 25° und 145° liegen kann. Der Winkel α wird hierbei von der Gießwalzenseite aus bestimmt, wie in Fig. 4 dargestellt.In FIG. 4, the outlet opening 17 or the
Von einer Vielzahl von Gasstrahlen, die von aneinander gereihten Gasstrahldüsen erzeugt werden, wird ein abgegrenzter Oberflächenbereich auf der Badoberfläche erzeugt, innerhalb dessen die schmelzenfremden Partikel gesammelt werden. Fig. 5 zeigt die Badoberfläche 8 zwischen zwei Gießwalzen 1, 2 und zwei Seitenplatten 3, 4. Oberhalb der Badoberfläche 8 sind Gasstrahldüsen 16 parallel zu den Gießwalzen und parallel zu den Seitenplatten positioniert und erzeugen gerichtete Gasstrahlen 20 gegen die Badoberfläche 8. Sie grenzen einen im Wesentlichen rechteckigen abgegrenzten Oberflächenbereich 30 auf der Badoberfläche 8 ein, in dem sich die schmelzenfremden Partikel sammeln.Of a plurality of gas jets generated from juxtaposed gas jets, a delimited surface area is created on the bath surface within which the alien particles are collected. Fig. 5 shows the
In Fig. 6 ist eine weitere vorteilhafte Ausführungsform zur Bildung von zwei abgegrenzten Oberflächenbereichen 30 veranschaulicht. Gasstrahldüsen 16 sind hier einer Winkellage zu den Gießwalzen 1, 2 ausgerichtet und bilden dementsprechend eine zu den Gießwalzen schräg orientierte Bugwelle aus. Das mittig in das Schmelzenbad eintauchende Tauchgießrohr 6 ist in die Bildung des abgegrenzten Oberflächenbereiches 30 eingebunden und begrenzt in einem Teilabschnitt diesen Oberflächenbereich. In einem weiteren Teilabschnitt erfolgt die jeweilige Abgrenzung der beiden Oberflächenbereiche 30 durch die Seitenplatten 3, 4. Die annähernd V-förmige Ausbildung der beiden abgegrenzten Oberflächenbereiche 30 ermöglicht den besonderen Vorteil einer kontinuierlichen Ableitung von schmelzenfremden Partikeln zu den Seitenplatten 3, 4 und damit in die äußersten Randbereiche des gegossenen Stahlbandes.FIG. 6 illustrates a further advantageous embodiment for forming two delimited
Eine mögliche Ausführungsform für die Einbindung von Gasstrahldüsen in die das Schmelzenbad vor Falschluftzutritt abschirmenden Abdeckhaube 9 ist in Fig. 7 dargestellt. Zwischen den Gießwalzen 1, 2 ist die Abdeckhaube 9 mit nicht näher dargestellten Abstützungen oberhalb der Badoberfläche 8 mit einem geringen Abstand zu den Gießwalzenoberflächen 14, 15 zwischen diesen positioniert. Die Abdeckhaube 9 ist mit Durchlässen oder randseitigen Ausnehmungen ausgestattet, von denen nur ein derartiger Durchlass 31 dargestellt ist, in den eine Gasstrahldüse 16 eingesetzt und an einer Konsole 32 der Abdeckhaube 9 verschraubt ist. Die Gasstrahldüse 16 ist als Schlitzdüse oder Flachstrahldüse mit einer schlitzförmigen Austrittsöffnung 17 ausgebildet und weist einen zumindest im Endbereich geraden Austrittskanal 19 auf. Damit wird ein sehr schmaler, gebündelter und gegen die Badoberfläche 8 gerichteter Gasstrahl 20 erzeugt, der die Bugwelle 24 ausbildet.A possible embodiment for the integration of gas jet nozzles into the
Eine weitere vorteilhafte Ausführungsform zur Bildung eines abgegrenzten Oberflächenbereiches 25 ist in Fig. 8 veranschaulicht. Gasstrahldüsen 16 sind im Abstand von der Badoberfläche 8 und deren Rändern zu den Gießwalzen 1, 2 und den Seitenplatten 3, 4 allseitig angeordnet und mit ihren Austrittsöffnungen auf die Badoberfläche gerichtet. in einem Teilabschnitt entlang des abgegrenzten Oberflächenbereiches entlang der Gießwalzen-Längserstreckung sind zwei Reihen von Gasstrahldüsen 16a, 16b, ... parallel zueinander ausgerichtet, die in Fig. 9 dargestellte parallel zueinander verlaufende Gasstrahlen 20 a, 20b, ... bilden. Mit derselben Wirkung können auch Gasstrahldüsen mit zwei Austrittsöffnungen eingesetzt werden. In beiden Fällen wird eine doppelte Bugwelle erzeugt. Fig. 9 zeigt eine Gasstrahldüse 16 mit zwei Austrittsöffnungen 17a, 17b und mit in Gasströmrichtung divergierenden Austrittskanälen 19a, 19b. Die Austrittskanäle können jedoch auch parallel zueinander verlaufen. Es werden im Abstand zueinander zwei Bugwellen 24a, 24b auf der Badoberfläche 8 erzeugt und damit eine doppelte Sperre für die schmelzenfremden Partikel errichtet.A further advantageous embodiment for forming a delimited surface region 25 is illustrated in FIG. 8.
Die Erfindung ist jedoch nicht auf die dargestellten und beschriebenen Ausführungsformen beschränkt, sondern kann vielfach modifiziert werden. Es ist auch möglich, aneinander anschließenden, einen abgegrenzten Oberflächenbereich ausbildende Gasstrahlen und die zugehörigen Gasstrahldüsen so anzuordnen, dass die Gasstrahlen in einem Umfangsabschnitt des abgegrenzten Oberflächenbereiches direkt gegen die Badoberfläche und in einem weiteren Abschnitt auf die Gießwalzenoberfläche oder die Seitenplatten gerichtet sind.However, the invention is not limited to the illustrated and described embodiments, but can be modified many times. It is also possible to arrange adjoining gas jets forming a defined surface area and the associated gas jet nozzles so that the gas jets are directed in a peripheral portion of the delimited surface area directly against the bath surface and in another portion of the Gießwalzenoberfläche or side plates.
Claims (31)
- Process for producing a cast metal strip using two casting rolls (1, 2) and two sides plates (3, 4), which together form a melt space (5) and a casting gap (7), metal melt being fed into the melt space and in the melt space forming a melt bath with a bath surface (8) which is open at the top, and a cast metal strip (13) being delivered out of the melt space through the casting gap, and a delimited surface region (30) for the collection of particles which are foreign to the melt being formed on the bath surface (8) under the action of at least one gas jet (20, 20a, 20b), characterized in that the whole of the at least one gas jet (20, 20a, 20b) strikes the bath surface with the gas jet axis (21) at a distance of from 10 mm to 50 mm, measured on the bath surface, from the contact line (10, 11) between the bath surface (8) and the casting roll (1, 2).
- Process according to Claim 1, characterized in that the at least one gas jet is directed toward the bath surface at an angle (α) of from 25° to 145°, preferably at an angle (α) of from 35° to 90°.
- Process according to one of the preceding claims, characterized in that the at least one gas jet (20, 20a, 20b) is directed on to the bath surface with the gas jet axis (21) at a distance from the contact line (10, 11) between the bath surface (8) and the side plate (3, 4).
- Process according to Claim 3, characterized in that the gas jet (20, 20b) strikes the bath surface with the gas jet axis (21, 21b) at a distance from the contact line (10, 11) between the bath surface (8) and the side plate (3, 4) of from 10 mm to 50 mm, measured on the bath surface.
- Process according to Claim 1 or 2, characterized in that the at least one gas jet is directed on to the side plate surface at a distance from the contact line between the bath surface and the side plate, and at least a part-stream of the gas jet is effectively diverted on to the bath surface.
- Process according to one of the preceding claims, characterized in that the at least one gas jet is in the form of a fan jet.
- Process according to Claim 6, characterized in that the at least one gas jet is in the form of a partially curved fan jet.
- Process according to one of the preceding claims, characterized in that the at least one gas jet diverges with an opening angle (γ) of between 10° and 35° in the direction of flow.
- Process according to one of the preceding claims, characterized in that between the two side plates, if appropriate leaving clear a distance with respect to the side plates, the at least one gas jet acts on the bath surface parallel or obliquely, without interruption, to the contact line between the bath surface and the casting roll.
- Process according to one of the preceding claims, characterized in that between the two casting rolls, if appropriate leaving clear a distance with respect to the casting rolls, the at least one gas jet acts on the bath surface parallel, without interruption, to the contact line between the bath surface and the side plate.
- Process according to one of the preceding claims, characterized in that at least in sections at least two gas jets (20a, 20b) act on the bath surface at a distance from one another.
- Process according to one of the preceding claims,
characterized in that the at least one gas jet forms a bow wave (24) at the bath surface, which encloses the delimited surface region at least in sections and is kept constant at a height of from 0.05 mm to 10 mm, preferably from 0.1 mm to 3 mm, above the normal level of the bath surface. - Process according to one of the preceding claims, characterized in that an inert or reducing gas, preferably argon or nitrogen or N + H2 or mixtures of at least two of these gases, is used to form the gas jet.
- Process according to one of preceding claims, characterized in that the action of the at least one gas jet on the bath surface during the starting phase of the casting process is only switched on 10 sec to 2 min after the start of the introduction of melt into the melt space.
- Process according to one of the preceding claims, characterized in that the action of at least one gas jet on the bath surface is interrupted in sections in a time interval in order for particles which are foreign to the melt to be discharged from a delimited surface region.
- Process according to Claim 15, characterized in that the action of at least one gas jet on the bath surface is interrupted along the contact line between the bath surface and at least one of the two casting rolls.
- Process according to Claim 15, characterized in that the action of at least one gas jet on the bath surface is interrupted along the contact line between the bath surface and at least one of the two side plates, preferably along the contact line between the bath surface and both side plates.
- Process according to one of Claims 15 to 17, characterized in that particles which are foreign to the melt are removed from the metal strip by trimming the edges of the cast metal strip.
- Process according to one of Claims 15 to 18, characterized in that the removal of particles which are foreign to the melt takes place in a time interval immediately after the coil weight of the cast metal strip has been reached, and this metal strip section which is enriched with particles foreign to the melt is removed.
- Two-roll casting device for producing a cast metal strip having two casting rolls (1, 2) driven in rotation and side plates (3, 4) bearing against the end sides of the casting rolls, which casting rolls and side plates together form a melt space (5) for holding a melt bath with a bath surface (8) and a casting gap (7), wherein at least one gas jet nozzle (16, 16a, 16b, ...) with an outlet opening (17, 17a, 17b, ...) for a targeted gas jet (20, 20a, 20b, ...) is arranged in the melt space (5) or directed into the melt space in such a way that a delimited surface region (30) for the collection of particles which are foreign to the melt is formed on the bath surface (8), characterized in that the outlet opening (17, 17a, 17b, ...) of the gas jet nozzle (16, 16a, 16b, ...) is directed on to the bath surface (8) at a distance from the contact line (10, 11) between the bath surface (8) and the casting roll (1, 2), such that the whole of the divergent gas jet strikes the bath surface, and the distance between the gas jet axis (21, 21b) directed on to the bath surface (8) and the contact line between the bath surface and the casting roll is in a range from 10 mm to 50 mm, measured on the bath surface.
- Two-roll casting device according to Claim 20, characterized in that the outlet opening (17, 17a, 17b, ...) of the gas jet nozzle (16, 16a, 16b, ...) is directed toward the bath surface (8) at an angle (α) of from 25° to 140°, preferably at an angle (α) of from 35° to 90°.
- Two-roll casting device according to one of Claims 20 or 21, characterized in that the outlet opening (17, 17a, 17b, ...) of the gas jet nozzle (16, 16a, 16b, ...) is directed on to the bath surface (8) at a distance from the contact line (10, 11) between the bath surface (8) and the side plate (3, 4).
- Two-roll casting device according to Claim 22, characterized in that the distance between the gas jet axis (21, 21b) directed on to the bath surface (8) and the contact line between the bath surface and the side plate (3, 4) is in a range from 10 mm to 50 mm, measured on the bath surface.
- Two-roll casting device according to one of Claims 20 to 23, characterized in that the outlet opening (17, 17a, 17b, ...) of the gas jet nozzle (16, 16a, 16b, ...) is directed on to the side plate at a distance from the contact line between the bath surface and a side plate (3, 4).
- Two-roll casting device according to one of Claims 20 to 24, characterized in that between the two side plates (3, 4), if appropriate leaving clear a distance with respect to the side plates, the outlet opening (17, 17a, 17b, ...) of the gas jet nozzle (16, 16a, 16b, ...) is directed on to the bath surface parallel to the contact line (10, 11) between the bath surface (8) and the casting roll (1, 2).
- Two-roll casting device according to one of Claims 20 to 25, characterized in that between the two casting rolls (1, 2), if appropriate leaving clear a distance with respect to the casting rolls, the outlet opening (17, 17a, 17b, ...) of the gas jet nozzle (16, 16a, 16b, ...) is directed on to the bath surface (8) parallel to the contact line between the bath surface and the side plate (3, 4).
- Two-roll casting device according to one of Claims 20 to 26, characterized in that the gas jet nozzle (16, 16a, 16b, ...) is in the form of a fan jet nozzle with a slot-shaped outlet opening (17, 17a, 17b, ...).
- Two-roll casting device according to one of Claims 20 to 27, characterized in that a gas jet nozzle (16a, 16b) is equipped with two, substantially equidistant, outlet openings (17a, 17b) for targeted gas jets (20a, 20b), or two gas jet nozzles each having one outlet opening are provided, in which case the outlet openings are arranged in such a way that a double-delimited surface region (30) for the collection of particles which are foreign to the melt is formed on the bath surface (8).
- Two-roll casting device according to one of Claims 20 to 28, characterized in that the outlet opening (17, 17a, 17b, ...) of at least one gas jet nozzle (16, 16a, 16b, ...) is directed on to the bath surface (8) in such a way that together with sections of the casting rolls (1, 2) or of the side plates (3, 4) or of other internal fittings within the melt space (5), they form a delimited surface region (30) on the bath surface (8) under the action of gas jets (20, 20a, 20b, ...).
- Two-roll casting device according to one of Claims 20 to 29, characterized in that the melt space (5) formed by casting rolls (1, 2) and side plates (3, 4) is closed off with respect to the ingress of air by means of a covering hood (9), and the outlet opening (17, 17a, 17b, ...) of the at least one gas jet nozzle (16, 16a, 16b, ...) opens out into the melt space (5).
- Two-roll casting device according to Claim 30, characterized in that the gas jet nozzles (16, 16a, 16b, ...) are secured to the covering hood (9) and oriented.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT04731907T ATE345184T1 (en) | 2003-05-19 | 2004-05-10 | METHOD FOR PRODUCING A CAST METAL STRIP AND TWO-ROLL CASTING DEVICE THEREFOR |
SI200430187T SI1626829T1 (en) | 2003-05-19 | 2004-05-10 | Method for producing a cast metal strip and corresponding twin roll casting installation |
PL04731907T PL1626829T3 (en) | 2003-05-19 | 2004-05-10 | Method for producing a cast metal strip and corresponding twin roll casting installation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT0077203A AT414103B (en) | 2003-05-19 | 2003-05-19 | METHOD FOR PRODUCING A CAST METAL STRIP AND TWO ROLLER CASTING DEVICE THEREFOR |
PCT/EP2004/004947 WO2004101196A1 (en) | 2003-05-19 | 2004-05-10 | Method for producing a cast metal strip and corresponding twin roll casting installation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1626829A1 EP1626829A1 (en) | 2006-02-22 |
EP1626829B1 true EP1626829B1 (en) | 2006-11-15 |
Family
ID=33437391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04731907A Expired - Lifetime EP1626829B1 (en) | 2003-05-19 | 2004-05-10 | Method for producing a cast metal strip and corresponding twin roll casting installation |
Country Status (19)
Country | Link |
---|---|
US (1) | US7591300B2 (en) |
EP (1) | EP1626829B1 (en) |
JP (2) | JP4927545B2 (en) |
KR (2) | KR20060013411A (en) |
CN (1) | CN1791483B (en) |
AT (2) | AT414103B (en) |
AU (1) | AU2004238514B2 (en) |
BR (1) | BRPI0410781B1 (en) |
CA (1) | CA2526089C (en) |
DE (1) | DE502004002021D1 (en) |
DK (1) | DK1626829T3 (en) |
ES (1) | ES2277256T3 (en) |
MX (1) | MXPA05012220A (en) |
PL (1) | PL1626829T3 (en) |
RU (1) | RU2343039C2 (en) |
SI (1) | SI1626829T1 (en) |
UA (1) | UA84703C2 (en) |
WO (1) | WO2004101196A1 (en) |
ZA (1) | ZA200509064B (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100802477B1 (en) * | 2006-08-24 | 2008-02-12 | 주식회사 포스코 | Continuous casting machine and method |
KR101316149B1 (en) * | 2011-09-23 | 2013-10-08 | 주식회사 포스코 | Twin roll strip casting method for reducing scum input |
RU2484919C1 (en) * | 2011-11-10 | 2013-06-20 | Российская Федерация, От Имени Которой Выступает Министерство Промышленности И Торговли Российской Федерации | Nozzle for production of amorphous strip |
WO2013075096A1 (en) * | 2011-11-17 | 2013-05-23 | Nucor Corporation | Method of continuous casting thin steel strip |
CN105705268A (en) * | 2013-11-07 | 2016-06-22 | 维苏威坩埚公司 | Nozzle for casting metal beams |
KR20170055087A (en) * | 2015-11-10 | 2017-05-19 | 주식회사 포스코 | Twin roll strip caster and casting method of it |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60170562A (en) * | 1984-02-13 | 1985-09-04 | Mitsubishi Heavy Ind Ltd | Continuous casting device for thin sheet |
US4751957A (en) * | 1986-03-11 | 1988-06-21 | National Aluminum Corporation | Method of and apparatus for continuous casting of metal strip |
JPH02207946A (en) * | 1989-02-07 | 1990-08-17 | Nippon Steel Corp | Method and device for removing scum at the time of continuous casting |
JPH04197560A (en) * | 1990-11-29 | 1992-07-17 | Nippon Yakin Kogyo Co Ltd | Method for continuously casting metal sheet |
JP2941545B2 (en) * | 1992-02-20 | 1999-08-25 | 三菱重工業株式会社 | Scum removal device for continuous sheet casting machine |
FR2693135B1 (en) * | 1992-07-03 | 1994-08-19 | Usinor Sacilor | Continuous casting installation between movable walls, and casting method using the installation. |
JP2001314946A (en) * | 2000-03-03 | 2001-11-13 | Nippon Steel Corp | Continuous casting method of thin casting piece and apparatus |
JP2001286991A (en) * | 2000-03-31 | 2001-10-16 | Nippon Steel Corp | Method for continuously casting stainless steel thin cast slab excellent in surface characteristic and its apparatus |
JP2002219564A (en) * | 2001-01-23 | 2002-08-06 | Nippon Steel Corp | Removing method for molten metal scum in thin strip continuously casting and device therefor |
JP4473466B2 (en) * | 2001-04-16 | 2010-06-02 | 新日本製鐵株式会社 | Thin strip casting continuous casting method and apparatus |
CH695090A5 (en) * | 2001-09-18 | 2005-12-15 | Main Man Inspiration Ag | A method and an apparatus for producing a metal strip on a roll strip casting machine. |
CH695600A5 (en) * | 2001-12-10 | 2006-07-14 | Main Man Inspiration Ag | A method and an apparatus for producing a metal strip on a roll strip casting machine. |
JP2003266153A (en) * | 2002-03-14 | 2003-09-24 | Nippon Steel Corp | Method for casting thin cast slab with twin-drum type continuous casting machine |
-
2003
- 2003-05-19 AT AT0077203A patent/AT414103B/en not_active IP Right Cessation
-
2004
- 2004-05-10 PL PL04731907T patent/PL1626829T3/en unknown
- 2004-05-10 US US10/557,319 patent/US7591300B2/en active Active
- 2004-05-10 ES ES04731907T patent/ES2277256T3/en not_active Expired - Lifetime
- 2004-05-10 UA UAA200512125A patent/UA84703C2/en unknown
- 2004-05-10 AU AU2004238514A patent/AU2004238514B2/en not_active Ceased
- 2004-05-10 SI SI200430187T patent/SI1626829T1/en unknown
- 2004-05-10 ZA ZA200509064A patent/ZA200509064B/en unknown
- 2004-05-10 AT AT04731907T patent/ATE345184T1/en active
- 2004-05-10 DE DE502004002021T patent/DE502004002021D1/en not_active Expired - Lifetime
- 2004-05-10 RU RU2005139551/02A patent/RU2343039C2/en active
- 2004-05-10 KR KR1020057022153A patent/KR20060013411A/en not_active Application Discontinuation
- 2004-05-10 BR BRPI0410781-0A patent/BRPI0410781B1/en not_active IP Right Cessation
- 2004-05-10 CA CA2526089A patent/CA2526089C/en not_active Expired - Fee Related
- 2004-05-10 WO PCT/EP2004/004947 patent/WO2004101196A1/en active IP Right Grant
- 2004-05-10 CN CN2004800137013A patent/CN1791483B/en not_active Expired - Lifetime
- 2004-05-10 KR KR1020127020321A patent/KR20120092726A/en not_active Application Discontinuation
- 2004-05-10 MX MXPA05012220A patent/MXPA05012220A/en active IP Right Grant
- 2004-05-10 DK DK04731907T patent/DK1626829T3/en active
- 2004-05-10 JP JP2006529764A patent/JP4927545B2/en not_active Expired - Fee Related
- 2004-05-10 EP EP04731907A patent/EP1626829B1/en not_active Expired - Lifetime
-
2010
- 2010-06-22 JP JP2010141988A patent/JP2010253560A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
US7591300B2 (en) | 2009-09-22 |
AU2004238514B2 (en) | 2009-09-24 |
CA2526089C (en) | 2012-01-31 |
PL1626829T3 (en) | 2007-04-30 |
SI1626829T1 (en) | 2007-04-30 |
RU2343039C2 (en) | 2009-01-10 |
JP4927545B2 (en) | 2012-05-09 |
WO2004101196A1 (en) | 2004-11-25 |
KR20120092726A (en) | 2012-08-21 |
CA2526089A1 (en) | 2004-11-25 |
ZA200509064B (en) | 2007-03-28 |
ES2277256T3 (en) | 2007-07-01 |
JP2007533460A (en) | 2007-11-22 |
BRPI0410781A (en) | 2006-06-20 |
CN1791483A (en) | 2006-06-21 |
MXPA05012220A (en) | 2006-02-08 |
US20060248706A1 (en) | 2006-11-09 |
DE502004002021D1 (en) | 2006-12-28 |
KR20060013411A (en) | 2006-02-09 |
CN1791483B (en) | 2012-07-11 |
ATA7722003A (en) | 2005-12-15 |
AU2004238514A1 (en) | 2004-11-25 |
AT414103B (en) | 2006-09-15 |
ATE345184T1 (en) | 2006-12-15 |
JP2010253560A (en) | 2010-11-11 |
UA84703C2 (en) | 2008-11-25 |
DK1626829T3 (en) | 2007-03-26 |
EP1626829A1 (en) | 2006-02-22 |
RU2005139551A (en) | 2006-05-10 |
BRPI0410781B1 (en) | 2013-05-28 |
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