EP0800880A2 - Procédé et dispositif pour la coulée de bandes métalliques - Google Patents

Procédé et dispositif pour la coulée de bandes métalliques Download PDF

Info

Publication number
EP0800880A2
EP0800880A2 EP97302492A EP97302492A EP0800880A2 EP 0800880 A2 EP0800880 A2 EP 0800880A2 EP 97302492 A EP97302492 A EP 97302492A EP 97302492 A EP97302492 A EP 97302492A EP 0800880 A2 EP0800880 A2 EP 0800880A2
Authority
EP
European Patent Office
Prior art keywords
casting
pool
nip
rolls
molten metal
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.)
Granted
Application number
EP97302492A
Other languages
German (de)
English (en)
Other versions
EP0800880B1 (fr
EP0800880A3 (fr
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/fr
Publication of EP0800880A3 publication Critical patent/EP0800880A3/fr
Application granted granted Critical
Publication of EP0800880B1 publication Critical patent/EP0800880B1/fr
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 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 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.
  • a method of casting metal strip comprising introducing molten metal between a pair of chilled casting rolls via an elongate metal delivery nozzle disposed above and extending along the nip between the rolls to form a casting pool of molten metal supported above the nip and confined at the ends of the nip by pool confining end closures, and rotating the rolls so as to cast a solidified strip delivered downwardly from the nip; wherein the molten metal is caused to flow from the delivery nozzle in two mutually oppositely directed series of jet streams of molten metal which are directed outwardly of the elongate delivery nozzle to impinge directly on the casting surfaces of the rolls in the immediate vicinity of the casting pool surface, said end closures are plates of electrically non conducting material, and molten metal in the pool in the vicinity of said end closures and the pool surface is subjected to electromagnetic induction heating by passing electric current through electrical conductors disposed outside the non-conducting end closure plates, each electrical conductor being
  • the loop is spaced above the level of the nip 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 and the casting rolls.
  • the bottom segment of the coil is no more than about 70 mm below the level of pool surface.
  • the electric current passing through the electrical conductors is alternating current with a frequency in the range 6 to 10 kHz.
  • the invention also provide 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 closures 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, the end closures are in the form of plates of electrically non conducting material, and there is a pair of electrical conductors disposed one outside each of the end closures and electrical supply means to supply electrical current to the electrical conductors to cause induction heating of molten metal in the casting pool in the vicinity of said end closures and the pool surface
  • 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)
EP97302492A 1996-04-18 1997-04-11 Procédé et dispositif pour la coulée de bandes métalliques Expired - Lifetime EP0800880B1 (fr)

Applications Claiming Priority (3)

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

Publications (3)

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

Family

ID=3793670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97302492A Expired - Lifetime EP0800880B1 (fr) 1996-04-18 1997-04-11 Procédé et dispositif pour la coulée de bandes métalliques

Country Status (6)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107949453A (zh) * 2015-11-26 2018-04-20 宝马股份公司 用于借助激光束的叠加的振动运动进行远程激光焊接的方法
CN110170626A (zh) * 2019-06-20 2019-08-27 中冶赛迪工程技术股份有限公司 一种铸轧预冷浇注装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212248A2 (fr) * 1985-08-09 1987-03-04 Sms Schloemann-Siemag Aktiengesellschaft Installation de coulée continue verticale ou courbe pour la coulée de l'acier
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
EP0491641A1 (fr) * 1990-12-17 1992-06-24 Usinor Sacilor Dispositif de coulée continue de bandes minces de métal, notamment d'acier
EP0598212A2 (fr) * 1992-11-11 1994-05-25 Didier-Werke Ag Dispositif pour la coulée d'un produit proche de ses dimensions finales

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0212248A2 (fr) * 1985-08-09 1987-03-04 Sms Schloemann-Siemag Aktiengesellschaft Installation de coulée continue verticale ou courbe pour la coulée de l'acier
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
EP0491641A1 (fr) * 1990-12-17 1992-06-24 Usinor Sacilor Dispositif de coulée continue de bandes minces de métal, notamment d'acier
EP0598212A2 (fr) * 1992-11-11 1994-05-25 Didier-Werke Ag Dispositif pour la coulée d'un produit proche de ses dimensions finales

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 278 (M-623), 9 September 1987 & JP 62 077156 A (NIPPON STEEL CORP;OTHERS: 01), 9 April 1987, *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 119 (M-0945), 6 March 1990 & JP 01 317658 A (NIPPON STEEL CORP), 22 December 1989, *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 407 (M-1019), 4 September 1990 & JP 02 155543 A (HITACHI LTD;OTHERS: 01), 14 June 1990, *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107949453A (zh) * 2015-11-26 2018-04-20 宝马股份公司 用于借助激光束的叠加的振动运动进行远程激光焊接的方法
CN107949453B (zh) * 2015-11-26 2020-01-14 宝马股份公司 用于借助激光束的叠加的振动运动进行远程激光焊接的方法
US10875121B2 (en) 2015-11-26 2020-12-29 Bayerische Motoren Werke Aktiengesellschaft Method for remote laser welding with superposed oscillating movement of the laser beam
CN110170626A (zh) * 2019-06-20 2019-08-27 中冶赛迪工程技术股份有限公司 一种铸轧预冷浇注装置
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

Also Published As

Publication number Publication date
KR970069192A (ko) 1997-11-07
AUPN935696A0 (en) 1996-05-16
ID16612A (id) 1997-10-23
EP0800880B1 (fr) 2001-08-16
EP0800880A3 (fr) 1998-12-30
MY132621A (en) 2007-10-31
JPH1029045A (ja) 1998-02-03

Similar Documents

Publication Publication Date Title
CA1055228A (fr) Methode et dispositif pour empecher le metal en fusion de s'echapper d'orifices, cavites, et ouvertures analogues, ou de s'y introduire
US6070647A (en) Casting metal strip
US5857514A (en) Strip casting
US6453986B1 (en) Metal delivery system for continuous caster
US5221511A (en) Strip casting
US6073680A (en) Strip casting
US6012508A (en) Strip casting
EP0515075B1 (fr) Procédé de coulée continue de métal liquide entre deux cylindres parallèles
EP0800880B1 (fr) Procédé et dispositif pour la coulée de bandes métalliques
US5845699A (en) Strip casting
GB2334471A (en) Strip casting apparatus
AU722566B2 (en) Strip casting
US4375830A (en) Method and apparatus for supporting a steel strand produced during a continuous strand casting method
EP1029617B2 (fr) Möthode de coulée continue de bande méallique
AU719920B2 (en) Strip casting
AU731277B2 (en) Strip casting
AU732559B2 (en) Casting metal strip
AU710986B2 (en) Metal delivery system for continuous caster
DE69706092T2 (de) Verfahren und Vorrichtung zum Giessen von Metallbändern

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