WO1998052706A1 - Cylindre de coulee pour une installation de coulee continue de bandes minces - Google Patents

Cylindre de coulee pour une installation de coulee continue de bandes minces Download PDF

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Publication number
WO1998052706A1
WO1998052706A1 PCT/AT1998/000131 AT9800131W WO9852706A1 WO 1998052706 A1 WO1998052706 A1 WO 1998052706A1 AT 9800131 W AT9800131 W AT 9800131W WO 9852706 A1 WO9852706 A1 WO 9852706A1
Authority
WO
WIPO (PCT)
Prior art keywords
jacket
casting
nickel
casting roll
thickness
Prior art date
Application number
PCT/AT1998/000131
Other languages
German (de)
English (en)
Inventor
Bruno Lindorfer
Gerald Hohenbichler
Original Assignee
Voest-Alpine Industrieanlagenbau Gmbh
Acciai Speciali Terni S.P.A.
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 Voest-Alpine Industrieanlagenbau Gmbh, Acciai Speciali Terni S.P.A. filed Critical Voest-Alpine Industrieanlagenbau Gmbh
Priority to AU74181/98A priority Critical patent/AU7418198A/en
Publication of WO1998052706A1 publication Critical patent/WO1998052706A1/fr

Links

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
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/0651—Casting wheels

Definitions

  • the invention relates to a casting roll for a thin strip continuous casting installation, with a cylindrical core, a jacket made of nickel and a jacket surrounding the jacket made of nickel
  • a casting roller of this type is known from EP-B - 0 320 572.
  • This casting roller has a core made of copper and a jacket of nickel surrounding this copper core with a thickness between 0.2 and 0.6 mm, and a jacket surrounding the nickel jacket made of chromium, the thickness of which is between 0.02 and 0.05 mm.
  • this known casting roller it should be possible to prevent the cast strip from sticking to the casting roller.
  • the wear of its surface that comes into contact with the melt becomes apparent and a roughening of this surface is prevented and also a deformation of the casting roll, a variation of the thickness of the cast strip and a rough surface of the cast strip are prevented
  • a casting roll which can be used both for casting a strip between two casting rolls or for casting a strip with only one casting roll. It has a first jacket surrounding a core, which is covered by a material such as, for example, Cu - is formed, which has a larger coefficient of expansion than the material of a second jacket which surrounds the first jacket and comes into direct contact with the melt and is made, for example, of steel or Ni.
  • This is intended to give a crowning effect due to the thermal load on the casting roll
  • Such a crowning resulted in a tape with a "dogbone" cross-section, that is, a tape whose thickness at the edges is greater than in the central area.
  • This known casting roller which is provided with an internal cooling, is used exclusively for the purpose of certain geometric deviations to minimize the cross-section of the tape, but without de s consideration or influence of the cast product
  • a casting roll for strip casting which has a male-cooled core made of copper with a connecting layer made of nickel or a nickel-cobalt alloy, on which a wear protection layer made of metal oxides is applied
  • Casting rolls with jackets made of pure, uncoated copper provide very high heat flow densities of up to over 10 MW / m 2 , but also relatively high relative fluctuations and relatively poor surface quality of the strip, in particular high surface densities
  • any injuries to the surface of the casting roll (scratches, scoring, etc.) immediately form an error negative tape and can, in contrast, because of the narrow thickness, contrast can no longer be rolled out for conventional slab casting
  • Such injuries can occur in the casting bed, e.g. when passing through tiny refractory particles (this can never be completely avoided due to the unavoidable refractory wear), as well as in the casting breaks (maintenance work, etc.) on soft surfaces, such as copper and Represent nickel, never be prevented
  • the invention aims to avoid these disadvantages and Schwie ⁇ gkeiten and sets itself the task of developing a casting roll of the type described in such a way that strips can be produced with a very high surface quality, which require virtually no post-treatment before a subsequent rolling process be avoided in the cast product
  • a third jacket surrounding the second jacket made of a thin, wear-resistant layer of high hardness (metal alloy, for example chrome alloy, or ceramic), which t ⁇ tt in contact with the melt
  • the second jacket expediently has a thickness of at least 0.8 mm, preferably a thickness of more than 1.5 mm
  • the second jacket is formed from a nickel alloy which has a thermal conductivity less than 90 W / mK, preferably a thermal conductivity less than 65 W / mK
  • the second and third sheaths have a thickness that is dimensioned such that the average thermal conductivity of the three sheaths is reduced by at least 15% compared to the thermal conductivity of a copper sheath with a thickness equal to the sum of the thicknesses of the three sheaths, wherein
  • the thickness of the third shell expediently lies between 10 and 200 ⁇ m, preferably between 10 and 50 ⁇ m
  • the thin jacket has a greater hardness, in particular a hardness approximately twice as large, and a greater resistance to abrasion than the second jacket, and further if the third jacket is applied to the second jacket by hard chrome plating
  • the casting roll has a concave outer jacket in cross section along the axis in the cold state, preferably the The diameter of the casting roll at the ends is 0.05 to 0.5 mm larger than its central diameter.
  • the internal cooling is preferably formed by coolant channels provided in the core of the casting roll.
  • FIG. 1 is a casting roll in longitudinal section, i.e. in section, which is laid through the axis of the casting roll.
  • the heat flow reduction is explained in more detail with reference to FIGS. 2 and 3.
  • FIG. 4 shows a further embodiment of the casting roll in a representation analogous to FIG. 1.
  • the casting roll 1 shown in Fig. 1 is used for casting thin strips, whereby it interacts either with a second casting roll, which is arranged axially parallel to it (as described in EP-A - 0 081 175), whereby between the casting rolls Casting gap is formed with a width corresponding to the thickness of the strip to be cast.
  • the casting roller 1 can also be supplied with molten metal via an outlet gap of a melt feed device, the molten metal solidifying on the surface of the casting roller 1, for example in accordance with EP-B - 0 422 056 or DE-A - 35 17 454.
  • the casting roller 1 has a cylindrical core 2 made of steel, in which 3 coolant channels 4 for a coolant, preferably cooling water, are provided just below its surface.
  • the cylindrical core 2 is surrounded by a first jacket 5, this first jacket 5 lying directly on the cylindrical surface 3 of the core 2.
  • This first jacket 5 is formed from copper or a copper alloy and has a thermal conductivity ⁇ [W / m / K] of approximately 200 to 350.
  • the melting temperature is preferably about 1000 ° C, the hardness [HV] is about 650.
  • This first jacket 5 is surrounded by a second jacket 6, which in turn is in direct contact with the outer surface 7 of the first jacket 5.
  • the second jacket 6 is a nickel layer with a thermal conductivity ⁇ [W / m / K] less than 90.
  • the melting temperature is approximately 1455 ° C.
  • the hardness [HV] is approximately 650.
  • this second jacket is surrounded by a third jacket 8, which in turn is in direct contact with the second jacket 6 and on the outside with the Liquid metal comes into contact
  • the third jacket 8 is a chrome layer, which is preferably produced by hard chrome plating of the casting rolls.
  • the thermal conductivity ⁇ [W / m / K] is below 67, the melting temperature at approximately 1890 ° C., the hardness [ HV] at around 1200
  • the thickness of the first jacket 5 is approximately 15 to 45 mm
  • the thickness of the second jacket 6 is over 0.8, preferably over 2 mm
  • the third jacket 8, ie the chrome layer has a thickness of 10 to 200 ⁇ m, preferably from 10 to 50 ⁇ m, on this thick jacket 8 gives the casting roll 1 the necessary hardness to be protected against scratching
  • the contour of the casting roll is profiled in the opposite way in the cold state, i.e. equipped with a concave profile so that the thermal expansion is compensated.
  • the diameter of the casting roller at its ends is 0.05 to 0.5 mm larger than its central diameter
  • the avoidance of cracks on the cast strip by using a casting roller 1 according to the invention is based on the effect of the casting roller according to the invention as a partial “heat flow brake”.
  • the heat flow reduction as a function of the thickness of the second jacket 6 is shown in FIG. 2.
  • the relationship between heat flow reduction, layer thickness and thermal conductivity 3 shows the maximum thermal conductivity, which must be around 75 W / mK, as an example of a thickness of the second jacket 6 of 1 mm, ie that a nickel alloy must be used, the thermal conductivity of which ⁇ at a maximum of 75 W / mK, thermal conductivities for nickel alloys, in particular at elevated temperatures of 100 to 450 ° C., are between 60 and 100 W / mK. It follows that the minimum thickness for the second jacket 6 must be 0.8 mm (cf. Fig 1)
  • coolant channels can also be provided at the boundary layer between the outer core surface and the inner surface of the first jacket 5 or within the first jacket 5, which is shown in Fig. 4 is shown

Landscapes

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

Abstract

L'invention concerne un cylindre de coulée (1) pour une installation de coulée continue de bandes minces comportant un noyau cylindrique (2), une gaine (6) en nickel et une gaine (8) entourant la gaine (6) en nickel. Le cylindre de coulée (1) présente la combinaison de caractéristiques suivantes, qui assure le coulage de bandes ayant une qualité de surface très élevée, en particulier sans crevasses transversales: un refroidissement interne (4), un noyau (2) en acier, une première gaine (5) en cuivre ou en alliage cuivreux entourant le noyau (2), une deuxième gaine (6) en nickel ou en alliage de nickel entourant la première gaine (5), une troisième gaine (8) entourant la deuxième gaine (6) et faite d'une mince couche dure, de préférence du chrome ou un alliage de chrome, qui entre en contact avec la masse en fusion.
PCT/AT1998/000131 1997-05-23 1998-05-20 Cylindre de coulee pour une installation de coulee continue de bandes minces WO1998052706A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74181/98A AU7418198A (en) 1997-05-23 1998-05-20 Casting cylinder for thin-band continuous casting installation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA888/97 1997-05-23
AT88897 1997-05-23

Publications (1)

Publication Number Publication Date
WO1998052706A1 true WO1998052706A1 (fr) 1998-11-26

Family

ID=3502147

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT1998/000131 WO1998052706A1 (fr) 1997-05-23 1998-05-20 Cylindre de coulee pour une installation de coulee continue de bandes minces

Country Status (2)

Country Link
AU (1) AU7418198A (fr)
WO (1) WO1998052706A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1005934A2 (fr) * 1998-12-04 2000-06-07 Nippon Steel Corporation Rouleau de refroidissement pour la coulée continue entre deux cylindres
WO2002053312A1 (fr) * 2000-12-30 2002-07-11 Sms Demag Aktiengesellschaft Procede pour faire fonctionner une machine de coulee en bande, et fret pour un rouleau de coulee utilise pour la mise en oeuvre de ce procede
WO2002053313A1 (fr) * 2000-12-30 2002-07-11 Sms Demag Aktiengesellschaft Frette pour un rouleau de coulee d'une machine de coulee de bandes
WO2002053311A2 (fr) * 2000-12-30 2002-07-11 Sms Demag Aktiengesellschaft Frette pour rouleau de coulee d'une machine de coulee en bande, et procede d'utilisation d'un tel rouleau de coulee
US6474402B1 (en) 1999-07-02 2002-11-05 Armco Inc. Segmented roll for casting metal strip
EP1468761A1 (fr) * 2003-04-17 2004-10-20 KM Europa Metal Aktiengesellschaft Cylindre de coulée pour le moulage de feuilles d'aluminium ou d'alliages d'aluminium
KR100690471B1 (ko) * 2000-07-05 2007-03-09 스페델 파르마 아게 치환된 옥타노일 아미드의 제조방법
EP1602424B2 (fr) † 2000-05-12 2013-03-27 Nippon Steel & Sumitomo Metal Corporation Tambour de refroidissement pour le moulage par coulage en continu de pieces fines et procede de coulage en continu

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081175A1 (fr) * 1981-12-04 1983-06-15 Kawasaki Steel Corporation Procédé et appareil pour la fabrication de feuilles métalliques minces par refroidissement rapide
DE3517454A1 (de) * 1984-05-14 1985-11-14 Olin Corp., East Alton, Ill. Verfahren und vorrichtung zum walzen von durch radgiessen gebildetem streifenmaterial
JPH01218743A (ja) * 1988-02-27 1989-08-31 Nippon Steel Corp 金属薄帯連続鋳造用冷却ドラム
JPH02160145A (ja) * 1988-12-10 1990-06-20 Kawasaki Steel Corp 急冷薄帯製造用の冷却ロール及びその製造方法
EP0422056B1 (fr) * 1988-06-30 1992-10-07 SUNDWIGER EISENHÜTTE MASCHINENFABRIK GmbH & CO. Procede et installation de fabrication d'une bande metallique d'au maximum 10 mm d'epaisseur
EP0320572B1 (fr) * 1987-12-17 1992-12-23 Kawasaki Steel Corporation Cylindre de refroidissement pour la fabrication de bandes métalliques minces trempées
EP0421908B1 (fr) * 1989-10-02 1994-03-02 USINOR SACILOR Société Anonyme Cylindre pour dispositif de coulée continue directe de bandes minces de métal liquide
EP0687515A1 (fr) * 1994-06-13 1995-12-20 Mitsubishi Jukogyo Kabushiki Kaisha Rouleau de refroidissement pour la coulée continue et procédé pour produire ce rouleau
WO1996002340A1 (fr) * 1994-07-18 1996-02-01 Siemens Aktiengesellschaft Couche de protection contre l'usure de cylindres de coulage

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0081175A1 (fr) * 1981-12-04 1983-06-15 Kawasaki Steel Corporation Procédé et appareil pour la fabrication de feuilles métalliques minces par refroidissement rapide
DE3517454A1 (de) * 1984-05-14 1985-11-14 Olin Corp., East Alton, Ill. Verfahren und vorrichtung zum walzen von durch radgiessen gebildetem streifenmaterial
EP0320572B1 (fr) * 1987-12-17 1992-12-23 Kawasaki Steel Corporation Cylindre de refroidissement pour la fabrication de bandes métalliques minces trempées
JPH01218743A (ja) * 1988-02-27 1989-08-31 Nippon Steel Corp 金属薄帯連続鋳造用冷却ドラム
EP0422056B1 (fr) * 1988-06-30 1992-10-07 SUNDWIGER EISENHÜTTE MASCHINENFABRIK GmbH & CO. Procede et installation de fabrication d'une bande metallique d'au maximum 10 mm d'epaisseur
JPH02160145A (ja) * 1988-12-10 1990-06-20 Kawasaki Steel Corp 急冷薄帯製造用の冷却ロール及びその製造方法
EP0421908B1 (fr) * 1989-10-02 1994-03-02 USINOR SACILOR Société Anonyme Cylindre pour dispositif de coulée continue directe de bandes minces de métal liquide
EP0687515A1 (fr) * 1994-06-13 1995-12-20 Mitsubishi Jukogyo Kabushiki Kaisha Rouleau de refroidissement pour la coulée continue et procédé pour produire ce rouleau
WO1996002340A1 (fr) * 1994-07-18 1996-02-01 Siemens Aktiengesellschaft Couche de protection contre l'usure de cylindres de coulage

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 013, no. 535 (M - 899) 29 November 1989 (1989-11-29) *
PATENT ABSTRACTS OF JAPAN vol. 014, no. 416 (M - 1021) 7 September 1990 (1990-09-07) *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1005934A2 (fr) * 1998-12-04 2000-06-07 Nippon Steel Corporation Rouleau de refroidissement pour la coulée continue entre deux cylindres
EP1005934A3 (fr) * 1998-12-04 2001-04-11 Nippon Steel Corporation Rouleau de refroidissement pour la coulée continue entre deux cylindres
US6371900B1 (en) 1998-12-04 2002-04-16 Nippon Steel Corporation Cooling drum for twin-drum continuous casting machine
US6474402B1 (en) 1999-07-02 2002-11-05 Armco Inc. Segmented roll for casting metal strip
EP1602424B2 (fr) † 2000-05-12 2013-03-27 Nippon Steel & Sumitomo Metal Corporation Tambour de refroidissement pour le moulage par coulage en continu de pieces fines et procede de coulage en continu
KR100690471B1 (ko) * 2000-07-05 2007-03-09 스페델 파르마 아게 치환된 옥타노일 아미드의 제조방법
WO2002053312A1 (fr) * 2000-12-30 2002-07-11 Sms Demag Aktiengesellschaft Procede pour faire fonctionner une machine de coulee en bande, et fret pour un rouleau de coulee utilise pour la mise en oeuvre de ce procede
WO2002053313A1 (fr) * 2000-12-30 2002-07-11 Sms Demag Aktiengesellschaft Frette pour un rouleau de coulee d'une machine de coulee de bandes
WO2002053311A2 (fr) * 2000-12-30 2002-07-11 Sms Demag Aktiengesellschaft Frette pour rouleau de coulee d'une machine de coulee en bande, et procede d'utilisation d'un tel rouleau de coulee
WO2002053311A3 (fr) * 2000-12-30 2002-10-24 Sms Demag Ag Frette pour rouleau de coulee d'une machine de coulee en bande, et procede d'utilisation d'un tel rouleau de coulee
US7108047B2 (en) 2000-12-30 2006-09-19 Sms Demag Ag Method for operating a strip casting machine and jacket ring for a casting roll used to carry out said method
EP1468761A1 (fr) * 2003-04-17 2004-10-20 KM Europa Metal Aktiengesellschaft Cylindre de coulée pour le moulage de feuilles d'aluminium ou d'alliages d'aluminium

Also Published As

Publication number Publication date
AU7418198A (en) 1998-12-11

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