EP0800880B1 - Verfahren und Vorrichtung zum Giessen von Metallbändern - Google Patents

Verfahren und Vorrichtung zum Giessen von Metallbändern Download PDF

Info

Publication number
EP0800880B1
EP0800880B1 EP97302492A EP97302492A EP0800880B1 EP 0800880 B1 EP0800880 B1 EP 0800880B1 EP 97302492 A EP97302492 A EP 97302492A EP 97302492 A EP97302492 A EP 97302492A EP 0800880 B1 EP0800880 B1 EP 0800880B1
Authority
EP
European Patent Office
Prior art keywords
casting
pool
metal
nip
rolls
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
Application number
EP97302492A
Other languages
English (en)
French (fr)
Other versions
EP0800880A3 (de
EP0800880A2 (de
Inventor
Chris Baharis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Castrip LLC
Original Assignee
BHP Steel JLA Pty Ltd
IHI Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BHP Steel JLA Pty Ltd, IHI Corp filed Critical BHP Steel JLA Pty Ltd
Publication of EP0800880A2 publication Critical patent/EP0800880A2/de
Publication of EP0800880A3 publication Critical patent/EP0800880A3/de
Application granted granted Critical
Publication of EP0800880B1 publication Critical patent/EP0800880B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B22D11/0642—Nozzles

Definitions

  • This invention relates to an apparatus for the casting of metal strip. It has particular but not exclusive application to the casting of ferrous metal strip.
  • molten metal is introduced between a pair of contra-rotated horizontal casting rolls which are cooled so that metal shells solidify on the moving roll surfaces and are brought together at the nip between them to produce a solidified strip product delivered downwardly from the nip between the rolls.
  • the term "nip" is used herein to refer to the general region at which the rolls are closest together.
  • the molten metal may be poured from a ladle into a smaller vessel from which it flows through a metal delivery nozzle located above the nip so as to direct it into the nip between the rolls, so forming a casting pool of molten metal supported on the casting surfaces of the rolls immediately above the nip. This casting pool may be confined between side plates or dams held in sliding engagement with the ends of the rolls.
  • Japanese Patent Publication 5-70537 of Nippon Steel Corporation also discloses a delivery nozzle aimed at producing a slow moving even flow of metal into the casting pool.
  • the nozzle is fitted with a porous baffle/diffuser to remove kinetic energy from the downwardly flowing molten metal which then flows into the casting pool through a series of apertures in the side walls of the nozzle.
  • the apertures are angled in such a way as to direct the in-flowing metal along the casting surfaces of the rolls longitudinally of the nip.
  • the apertures on one side of the nozzle direct the in-flowing metal longitudinally of the nip in one direction and the apertures on the other side direct the in-flowing metal in the other longitudinal direction with the intention of creating a smooth even flow along the casting surfaces with minimum disturbance of the pool surface.
  • a major cause of defects is premature solidification of molten metal in the regions where the pool surface meets the casting surfaces of the rolls, generally known as the "meniscus” or “meniscus regions” of the pool.
  • the molten metal in each of these regions flows towards the adjacent casting surface and if solidification occurs before the metal has made uniform contact with the roll surface it tends to produce irregular initial heat transfer between the roll and the shell with the resultant formation of surface defects, such as depressions, ripple marks, cold shuts or cracks.
  • the molten metal flows from the delivery nozzle in two mutually oppositely directed series of jet streams which are directed outwardly to impinge directly on the casting surfaces of the rolls in the immediate vicinity of the casting pool surface. It has been found that this permits casting of strip from molten metal supplied with relatively low level of superheat without the formation of surface cracks.
  • problems can arise due to the formation of pieces of solid metal known as "skulls" in the vicinity of the pool confining side plates or dams. These problems are exacerbated as the superheat of the incoming molten metal is reduced.
  • the rate of heat loss from the melt pool is greatest near the side dams due primarily to additional conductive heat transfer through the side dams to the roll ends. This high rate of local heat loss is reflected in the tendency to form "skulls" of solid metal in this region which can grow to a considerable size and fall between the rolls causing the rolls to "spring” apart and so generate severe defects in the strip.
  • the necessary increase in heat input is achieved by carefully targeted electromagnetic induction heating of the molten metal in the upper regions of the casting pool in the vicinity of the pool confining side dams where "skulls" may form, without significantly raising the superheat of the pool as a whole or adversely affecting metal solidification in the lower regions of the pool toward the nip.
  • Japanese patent publication JP62-77156 of Nippon Steel Corp discloses a previous proposal for electromagnetic induction heating of the casting pool in a twin roll caster in the vicinity of the side dams.
  • the induction heating is achieved by locating outside the side dams a pair of induction heating devices having induction coils wound on C-shaped cores disposed generally in a central vertical plane between the casting rolls. These devices provide diffuse heating of central regions of the casting pool substantially throughout its depth.
  • By the present invention it is possible to achieve much more carefully targeted heating of the molten metal entering the casting pool at its upper surface and in the meniscus regions of the pool where skull formation is a problem.
  • This is achieved by means of induction heating coils formed as single closed loops shaped and positioned adjacent upper parts of the pool to provide targeted heating across the upper surface of the pool and in the meniscus regions.
  • European Patent Publication EP491641 upon which the preamble of claim 1 is based, discloses a twin roll caster in which the casting pool is confined by thin metal side plates and electromagnetic induction coils are placed outside these metallic side plates so as to heat the side plates and the metal in the pool.
  • the use of thin metallic side plates leads to external cooling means being provided to prevent such plates from melting and/or distorting. This introduces severe cooling problems in the melt and it is then essential to have external heating means to counter balance this loss of heat.
  • the induction coils in the apparatus disclosed in EP491641 are operated at low frequency and provide diffuse heating throughout the end regions of the pool, including the lower regions adjacent the nip between the casting rolls. This is to be contrasted with the targeted heating achievable by the present invention.
  • Japanese Patent No. 02-155543-A discloses apparatus for casting strip wherein the side plates are heated by heating coil 13 to remelt solidified shell developing in the curving part in the short wall side which extends down to the nip region.
  • Japanese Patent No. 02-155543-A teaches heating the regions of contact between the molten metal, each roll and each side dam from the top of the pool to the nip. Consequently, with this arrangement it is necessary to eignificantly raise the superheat of the pool as a whole and adversely affect metal solidification in the lower regions of the pool toward the nip
  • apparatus for casting metal strip comprising a pair of parallel casting rolls forming a nip between them, an elongate metal delivery nozzle disposed above and extending along the nip between the casting rolls for delivery of molten metal into the nip to form a casting pool of molten metal supported above the nip, and a pair of pool confining end closure plates disposed one at each end of the pair of casting rolls, wherein the metal delivery nozzle has a series of side openings along each of its longitudinal sides for flow of molten metal from the delivery nozzle in two mutually oppositely directed series of jet streams to impinge directly on the casting surfaces of the rolls in the vicinity of the casting pool surface, and there is a pair of electrical conductors disposed one outside each of the end closure plates and electrical supply means to supply electrical current to the electrical conductors characterised in that the end closure plates are formed of electrically non-conducting material and each conductor is in the form of a single loop comprising a horizontal top segment to extend
  • each conductor loop is positioned so as not to extend below the upper two thirds of the pool depth.
  • each loop is curved to follow the conjunctions between the respective end closure plates and the casting rolls.
  • the bottom segment of the coil is no more than about 70 mm below the level of the pool surface.
  • the electrical supply means is such as to supply alternating electric current at a frequency in the range 6 to 10 kHz.
  • the illustrated caster comprises a main machine frame 11 which stands up from the factory floor 12.
  • Frame 11 supports a casting roll carriage 13 which is horizontally movable between an assembly station 14 and a casting station 15.
  • Carriage 13 carries a pair of parallel casting rolls 16 to which molten metal is supplied during a casting operation from a ladle 17 via a distributor 18 and delivery nozzle 19.
  • Casting rolls 16 are water cooled so that shells solidify on the moving roll surfaces and are brought together at the nip between them to produce a solidified strip product 20 at the nip outlet.
  • This product is fed to a standard coiler 21 and may subsequently be transferred to a second coiler 22.
  • a receptacle 23 is mounted on the machine frame adjacent the casting station and molten metal can be diverted into this receptacle via an overflow spout 24 on the distributor.
  • Roll carriage 13 comprises a carriage frame 31 mounted by wheels 32 on rails 33 extending along part of the main machine frame 11 whereby roll carriage 13 as a whole is mounted for movement along the rails 33.
  • Carriage frame 31 carries a pair of roll cradles 34 in which the rolls 16 are rotatably mounted.
  • Carriage 13 is movable along the rails 33 by actuation of a double acting hydraulic piston and cylinder unit 39, connected between a drive bracket 40 on the roll carriage and the main machine frame so as to be actuable to move the roll carriage between the assembly station 14 and casting station 15 and visa versa.
  • Casting rolls 16 are contra rotated through drive shafts 41 from an electric motor and transmission mounted on carriage frame 31.
  • Rolls 16 have copper peripheral. walls formed with a series of longitudinally extending and circumferentially spaced water cooling passages supplied with cooling water through the roll ends from water supply ducts in the roll drive shafts 41 which are connected to water supply hoses 42 through rotary glands 43.
  • the rolls may typically be about 500 mm diameter and up to 2 m long in order to produce up to 2 m wide strip product.
  • Ladle 17 is of entirely conventional construction and is supported via a yoke 45 on an overhead crane whence it can be brought into position from a hot metal receiving station.
  • the ladle is fitted with a stopper rod 46 actuable by a servo cylinder to allow molten metal to flow from the ladle through an outlet nozzle 47 and refractory shroud 48 into distributor 18.
  • Distributor 18 is formed as a wide dish made of a refractory material such as high alumina castable with a sacrificial lining.
  • One side of the distributor receives molten metal from the ladle and is provided with the aforesaid overflow 24.
  • the other side of the distributor is provided with a series of longitudinally spaced metal outlet openings 52.
  • the lower part of the distributor carries mounting brackets 53 for mounting the distributor onto the roll carriage frame 31 and provided with apertures to receive indexing pegs 54 on the carriage frame so as accurately to locate the distributor.
  • Delivery nozzle 19 is formed as an elongate body made of a refractory material such as alumina graphite. Its lower part is tapered so as to converge inwardly and downwardly so that it can project into the nip between casting rolls 16.
  • a mounting bracket 60 is provided to support the nozzle on the roll carriage frame and the upper part of the nozzle is formed with outwardly projecting side flanges 55 which locate on the mounting bracket.
  • Delivery nozzle 19 has an upwardly opening inlet trough 61 to receive molten metal flowing downwardly through the openings 52 of the distributor.
  • the bottom part of trough 61 is formed between downwardly convergent nozzle side walls 62 and the bottom is closed by a horizontal bottom floor 63.
  • Each longitudinal side wall 62 is perforated by a series of horizontally spaced openings 64 in the form of circular holes extending horizontally through the side walls.
  • Molten metal falls from the outlet openings 52 of the distributor in a series of free-falling vertical streams 65 to form a reservoir 66 of molten metal in the bottom part of the nozzle trough 61. Molten metal flows from this reservoir out through the openings 64 to form a casting pool 68 supported above the nip 66 between the casting rolls 16.
  • the casting pool is confined at the ends of rolls 16 by a pair of side closure plates 56 which are held against the ends 57 of the rolls.
  • Side closure plates 56 are made of strong refractory material, for example boron nitride. They are mounted in plate holders 82 which are movable by actuation of a pair of hydraulic cylinder units 83 to bring the side plates into engagement with the ends of the casting rolls to form end closures for the casting pool 68 of molten metal.
  • the flow of metal is controlled to maintain the casting pool at a level such that the lower end of the delivery nozzle 19 is submerged in the casting pool and the two series of horizontally spaced openings 64 of the delivery nozzle are disposed immediately beneath the surface of the casting pool.
  • the molten metal then flows from the reservoir within the nozzle trough 61 through the openings 64 in two laterally outwardly directed jet streams in the general vicinity of the casting pool surface so as to impinge on the cooling surfaces of the rolls in the immediate vicinity of the pool surface. This maximises the temperature of the molten metal delivered to the meniscus regions of the pool and it has been found that this significantly reduces the formation of cracks and meniscus marks on the melting strip surface.
  • a pair of induction heater elements 101 are disposed immediately outside the side plates 56. More specifically the heater elements are mounted on the thruster bodies 85 so as to back upper parts of the side plates 56 without interfering with pivoting movement of the side plates about the pivot pins 84.
  • Each end dam closure plate 56 is shaped so as to have a wide top 102 and a narrow bottom 103 connected by arcuate sides 104 which overlap the ends 57 of the casting rolls 16.
  • Each of the induction heater elements 101 comprises a generally trapezium shaped electrical conductor structure disposed adjacent the back of the respective side dam plate 56 so as in use of the apparatus to be adjacent the upper part of the casting pool. More particularly, it is shaped as a thick walled tubular copper conductor of generally rectangular cross-section extending in a trapezium shaped loop from parallel terminal sockets 105 through which it is supplied with alternating electric current through parallel tubular conductors 106 connected by bus bars 110 to alternating current supply leads 120. Cooling water is circulated through the loops via the conductors 106 as indicated by arrows 121 in Figure 8 and a separate flow of cooling water is passed through the bus bars 110 as indicated by arrows 122.
  • Each trapezium shaped copper loop has a wide top segment 107 arranged generally at the height of the casting pool surface and a narrower bottom segment 108 arranged to be disposed about 70 mm below the pool surface.
  • the top and bottom segments are connected by arcuate side segments 109 which follow the curvature of the casting rolls 11.
  • the electric induction heater elements 101 are effective to cause inductive heating of molten metal in the upper part of the casting pool immediately adjacent the side dam plates 56.
  • the coils are designed to maximise heating around the triple points at the meniscus regions of the pool. It has been demonstrated that this is effective to inhibit the formation of "skulls" at this region of the pool and that in combination with a nozzle which delivers a uniform flow of metal throughout the length of the rolls to the meniscus regions of the pool it is possible to dramatically reduce the superheat of the molten metal supplied for casting and that superheats of lower than 70°C can be achieved.
  • the electromagnetic fields produced by the shaped induction heater elements can extend through the side plates to cause effective heating of the molten metal in the pool without heating the side plates and without the need for field shaping or concentrating elements.
  • Figures 9 and 10 demonstrate the effectiveness of the present invention in eliminating the formation of skulls during casting at low superheats. These figures provide the results of measurement of casting roll separation forces during a single casting run of steel strip in a twin roll caster as illustrated in Figures 1 to 6.
  • Figure 9 shows forces measured during a time interval when the induction heaters were deliberately turned off. It will be seen that there were continuing fluctuations in the roll separation forces throughout this time interval. These were associated with the passage of skulls through the nip between the casting rolls with the resulting formation of severe defects in the strip.
  • Figure 10 shows the measurement of separation forces after the induction heaters were switched on showing that the force fluctuations were smoothed out, this being associated with elimination of the formation of skulls and corresponding defects in the strip.
  • the induction heaters In operation of a typical twin roll caster producing one metre wide steel strip at the rate of 60 m/min the induction heaters will need to be supplied with electric current in the range 3000-8000 amps at a frequency of 6 kHz to 10 kHz. The total power input to the induction heaters will accordingly be of the order of 10-100 kWatts per heater.
  • the induction heater elements 101 should not extend down to the lower parts of the casting pool. It has been found that the very damaging "skulls" are only formed in the upper part of the pool to a depth of about 70 mm. In the lower regions of the pool as the rolls approach the nip metal has already solidified and it is important that it not be reheated at this stage. This can be ensured if the heating coils are spaced above the nip such that they do not extend downwardly to the level of the bottom third of the depth of the casting pool. Previous proposals for induction heating of the pool have simply been directed to heating the pool in general and have involved heaters effective throughout the depth of the pool.
  • the location of the heater elements 101 well above the nip between the casting rolls allows the piston rods 84 of the cylinder units 83 and the associated thruster components to sit below the heater elements and this allows the side plates 56 to tilt about pins 84 as previously described without interference or inadvertent heating of the thruster components.
  • the illustrated apparatus has been advanced by way of example only and it could be modified considerably.
  • the metal instead of delivering molten metal from the tundish into the delivery nozzle in a series of free-falling streams as in the apparatus illustrated in Figures 1 to 6, the metal may be delivered in the delivery nozzle through a submerged entry nozzle. This may be in the form of a single tube as disclosed in the applicants' International Application PCT/AU97/00022. This would allow sufficiently direct flow of the molten metal through the delivery nozzle outlets distributed uniformly along the casting pool to deliver molten metal rapidly to the meniscus regions of the pool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Claims (8)

  1. Vorrichtung zum Gießen von Metallband mit einem Paar paralleler Gießwalzen (16), die einen Spalt zwischen sich bilden, einer langgestreckten Metallaustrittsdüse (19), die über dem Spalt zwischen den Gießwalzen (16) angeordnet ist und sich entlang diesem erstreckt, zur Abgabe von schmelzflüssigem Metall in den Spalt, um ein Gießbad (68) aus schmelzflüssigem Metall zu bilden, das über dem Spalt gehalten wird, und einem Paar Badbegrenzungsendverschlußplatten (56), die jeweils einzeln an jedem Ende des Paares von Gießwalzen (16) angeordnet sind, wobei die Metallaustrittsdüse (19) eine Serie von Seitenöffnungen (64) entlang jeder ihrer Längsseiten zum Ausströmen von schmelzflüssigem Metall aus der Austrittsdüse (19) in zwei einander entgegengesetzt gerichteten Serien von Strahlströmen hat, die direkt auf die Gießflächen der Walzen (16) in den Nähe der Gießbadoberfläche auftreffen, und wobei ein Paar elektrischer Leiter (101), die jeweils einzeln an der Außenseite der Endverschlußplatten (56) angeordnet sind, und eine elektrische Versorgungseinrichtung vorhanden sind, um den elektrischen Leitern (101) elektrischen Strom zuzuführen, dadurch gekennzeichnet, daß die Endverschlußplatten (56) aus elektrisch nichtleitendem Material ausgebildet sind und jeder Leiter (101) die Form einer einzelnen Schleife hat, mit einem horizontalen oberen Segment (107), das sich über einen oberen Abschnitt der jeweiligen Endverschlußplatte (56) erstreckt, um bei Verwendung der Vorrichtung im allgemeinen auf der Höhe der Gießbadoberfläche zu sein, und einem horizontalen unteren Segment (108), das kürzer ist als das obere Segment (107) und das mit dem oberen Segment (107) durch ein Paar nach unten zusammenlaufender Seitensegmenten (109) verbunden ist, wobei das untere Segment (108) über der Höhe des Spalts beabstandet angeordnet ist, wodurch die Leiter (101) die Wirkung haben, eine Induktionserwärmung von schmelzflüssigem Metall im Gießbad in der Nähe der Endverschlußplatten (56) und der Badoberfläche zu bewirken, ohne ein Schmelzen des erstarrten Metalls im Spalt zu bewirken.
  2. Vorrichtung nach Anspruch 1, ferner dadurch gekennzeichnet, daß jede Leiterschleife so positioniert ist, daß sie sich nicht unter die oberen beiden Drittel der Badtiefe erstreckt.
  3. Vorrichtung nach Anspruch 1 oder 2, ferner dadurch gekennzeichnet, daß die Seitensegmente (109) jeder Schleife so gekrümmt sind, daß sie den Linien des Zusammentreffens zwischen den jeweiligen Endverschlußplatten (56) und den Gießwalzen (16) folgen.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, ferner dadurch gekennzeichnet, daß das untere Segment der Spule nicht mehr als etwa 70 mm unter der Höhe der Badoberfläche ist.
  5. Vorrichtung nach einem der Ansprüche 1 bis 4, ferner dadurch gekennzeichnet, daß jede Schleife als einzelne trapezförmige Schleife aus einer hohlen Metallröhre ausgebildet ist und eine Kühleinrichtung vorhanden ist, die Kühlfluid durch die Röhre zirkulieren läßt.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, ferner dadurch gekennzeichnet, daß die elektrische Versorgungseinrichtung so beschaffen ist, daß sie elektrischen Wechselstrom mit einer Frequenz im Bereich von 6 bis 10 kHz zuführt.
  7. Vorrichtung nach einem der Ansprüche 1 bis 3, ferner dadurch gekennzeichnet, daß die Endverschlußplatten (56) in Plattenhaltern (82) gehalten werden, die mit Kolbenstangen (84) eines Paares von Druckzylindereinheiten (83) verbunden sind, die betriebsfähig sind, um die Platten gegen die Gießwalzen vorzuspannen, und die elektrischen Leiter über den Kolbenstangen beabstandet angeordnet sind.
  8. Vorrichtung nach Anspruch 7, ferner dadurch gekennzeichnet, daß die Plattenhalter (82) mit den Kolbenstangen (84) der Zylindereinheiten (83) drehbar verbunden sind, um Neigungsbewegungen der Endverschlußplatten (56) zu ermöglichen, und die elektrischen Leiter (101) relativ zu den Kolbenstangen (84) fest sind, um solche Neigungsbewegungen der Platten (56) nicht zu behindern.
EP97302492A 1996-04-18 1997-04-11 Verfahren und Vorrichtung zum Giessen von Metallbändern Expired - Lifetime EP0800880B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT9356/96 1996-04-18
AUPN9356A AUPN935696A0 (en) 1996-04-18 1996-04-18 Strip casting
AT935696 1996-04-18

Publications (3)

Publication Number Publication Date
EP0800880A2 EP0800880A2 (de) 1997-10-15
EP0800880A3 EP0800880A3 (de) 1998-12-30
EP0800880B1 true EP0800880B1 (de) 2001-08-16

Family

ID=3793670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97302492A Expired - Lifetime EP0800880B1 (de) 1996-04-18 1997-04-11 Verfahren und Vorrichtung zum Giessen von Metallbändern

Country Status (6)

Country Link
EP (1) EP0800880B1 (de)
JP (1) JPH1029045A (de)
KR (1) KR970069192A (de)
AU (1) AUPN935696A0 (de)
ID (1) ID16612A (de)
MY (1) MY132621A (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015223446A1 (de) 2015-11-26 2017-06-01 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Remote-Laserstrahlschweißen
CN110170626B (zh) * 2019-06-20 2024-02-06 中冶赛迪工程技术股份有限公司 一种铸轧预冷浇注装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3528649A1 (de) * 1985-08-09 1987-02-19 Schloemann Siemag Ag Vertikal- oder bogenstranggiessanlage fuer stahl
JPS6277156A (ja) * 1985-09-30 1987-04-09 Nippon Steel Corp 双ロ−ル型連続鋳造装置
JPH01317658A (ja) * 1988-06-17 1989-12-22 Nippon Steel Corp 金属薄帯の連続鋳造用ノズル
JPH02155543A (ja) * 1988-12-09 1990-06-14 Hitachi Ltd 薄鋳片の連続鋳造装置
FR2670413B1 (fr) * 1990-12-17 1993-04-09 Usinor Sacilor Dispositif de coulee continue de bandes minces de metal, notamment d'acier.
DE4238036A1 (de) * 1992-11-11 1994-05-19 Didier Werke Ag Einrichtung zum endabmessungsnahen Gießen

Also Published As

Publication number Publication date
AUPN935696A0 (en) 1996-05-16
MY132621A (en) 2007-10-31
EP0800880A3 (de) 1998-12-30
ID16612A (id) 1997-10-23
EP0800880A2 (de) 1997-10-15
JPH1029045A (ja) 1998-02-03
KR970069192A (ko) 1997-11-07

Similar Documents

Publication Publication Date Title
CA1055228A (en) Method of and apparatus for excluding molten metal from escaping from or penetrating into openings or cavities and the like
EP0850712B1 (de) Verfahren und Vorrichtung zum Giessen von Metallbändern
US5857514A (en) Strip casting
US6095233A (en) Metal delivery system for continuous caster
US5221511A (en) Strip casting
US6073680A (en) Strip casting
US6012508A (en) Strip casting
EP0515075B1 (de) Verfahren zum Bandgiessen von Metallen
US6125917A (en) Strip casting apparatus
EP0800880B1 (de) Verfahren und Vorrichtung zum Giessen von Metallbändern
EP0807476B1 (de) Verfahren und Vorrichtung zum Giessen von Metallbändern
AU722566B2 (en) Strip casting
US4375830A (en) Method and apparatus for supporting a steel strand produced during a continuous strand casting method
FI78250C (fi) Foerfarande och anordning foer direktgjutning av smaelt metall.
AU719920B2 (en) Strip casting
KR20000057923A (ko) 강 스트립 연속주조 방법
AU731277B2 (en) Strip casting
AU732559B2 (en) Casting metal strip
AU710986B2 (en) Metal delivery system for continuous caster
JPH10211553A (ja) 金属ストリップ鋳造方法及び装置並びに双ロールストリップ鋳造装置の鋳造溜めへ溶融金属を供給する耐火ノズル
JPH0494844A (ja) 双ドラム式連続鋳造装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19990419

17Q First examination report despatched

Effective date: 19990917

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB IT

REF Corresponds to:

Ref document number: 69706092

Country of ref document: DE

Date of ref document: 20010920

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: CASTRIP, LLC

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020410

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20030409

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20030424

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040411

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20041103

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20040411

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20050411

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20030430