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EP0108744B1 - Lingotière à extrémités ouvertes pour une installation de coulée continue - Google Patents

Lingotière à extrémités ouvertes pour une installation de coulée continue Download PDF

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Publication number
EP0108744B1
EP0108744B1 EP83890186A EP83890186A EP0108744B1 EP 0108744 B1 EP0108744 B1 EP 0108744B1 EP 83890186 A EP83890186 A EP 83890186A EP 83890186 A EP83890186 A EP 83890186A EP 0108744 B1 EP0108744 B1 EP 0108744B1
Authority
EP
European Patent Office
Prior art keywords
wear
resistant layer
open
grid
layer
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
Application number
EP83890186A
Other languages
German (de)
English (en)
Other versions
EP0108744A2 (fr
EP0108744A3 (en
Inventor
Erich Misera
Hubert Floh
Reinhard Hargassner
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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
Priority claimed from AT402382A external-priority patent/AT375571B/de
Priority claimed from AT132083A external-priority patent/AT377932B/de
Application filed by Voestalpine AG filed Critical Voestalpine AG
Publication of EP0108744A2 publication Critical patent/EP0108744A2/fr
Publication of EP0108744A3 publication Critical patent/EP0108744A3/de
Application granted granted Critical
Publication of EP0108744B1 publication Critical patent/EP0108744B1/fr
Expired legal-status Critical Current

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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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/059—Mould materials or platings

Definitions

  • the invention relates to a continuous mold for a continuous caster, in particular a steel continuous caster, with inner walls made of copper or a copper alloy, the inner walls being provided on their side facing the mold cavity with a wear-resistant layer, which layer extends from the outlet end of the mold over part of the Length of the mold extends.
  • Such a continuous mold is known from JP-A-57-68248.
  • the thickness of the wear-resistant layer has been kept as small as possible; it was chosen to be no larger than 1.5 mm. If the wear-resistant layer is applied electrolytically to the inner walls, since the electrolytic process is an expensive process, the layer thickness has been kept even smaller, for example in a range of a maximum of a few tenths of a millimeter. This results in another disadvantage; it has been shown that a shape deviation of the mold side walls only decisively influences the strand quality from a size of about 2 mm, so that one was forced to replace the wear-resistant layer before a maximum permissible shape deviation was reached, namely when the wear-resistant layer was used up.
  • JP-A-5 768 248 JP-A-5 768 2478 to provide the inner walls of the mold with a wear-resistant layer which extends from the outlet end of the mold only over part of the length of the mold.
  • the object of the invention is to provide a mold of the type mentioned at the outset with an extremely wear-resistant, relatively thick layer which is inexpensive to apply and which only slightly, if at all, reduces the heat transfer compared to an uncoated mold.
  • the wear-resistant layer contains 0.1 to 1.5% carbon, 2 to 20% chromium, 0.5 to 15% molybdenum and optionally up to 5% tungsten, up to 5% vanadium and up to 5% niobium , Remainder iron and melting-related impurities.
  • a relatively simple and inexpensive method for applying the wear-resistant layer is characterized in that an intermediate layer made of a nickel-copper alloy is welded between the wear-resistant layer and the inner wall is applied to the inner wall and the wear-resistant layer is also applied to the intermediate layer in a thickness of 3 to 10 mm by build-up welding.
  • the provision of an intermediate layer results in good mechanical adhesion between the wear-resistant layer and the inner walls.
  • the intermediate layer expediently contains 1 to 5% manganese, 0.5 to 1.5% silicon, 20 to 50% copper, the remainder nickel and melting-related impurities and optionally up to 5% niobium and / or iron and / or titanium.
  • the wear-resistant layer is applied directly to the inner wall without an intermediate layer by brazing, which makes it possible to achieve a good mechanical connection of the wear-resistant layer with the copper inner walls of the continuous mold despite the absence of the intermediate layer.
  • the wear-resistant layer is lattice-shaped, the surface areas of the inner walls lying between lattice bars of the wear-resistant layer being formed from the base material of the inner walls.
  • the bars are preferably inclined to the vertical axis of the mold, preferably arranged inclined at an angle between 30 and 60 °.
  • the ratio of the distance between two bars to the width of a bar is expediently in a range between 3 and 5.
  • the lattice-like wear layer is formed by lattice bars which are at right angles to one another and are arranged at the same distance from one another.
  • the grid-like wear layer according to the invention can be applied by welding in grooves in an inner wall.
  • a preferred method of applying the wear layer is characterized in that the inner wall is provided with grooves arranged in the form of a grid, that a grid is formed from bars of the wear-resistant layer and then this grid is pressed into the grooves of the inner wall, the grid being expediently from the rear the inner walls are secured with screws.
  • the wear-resistant layer is formed from the side regions of the inner wall to the central region of the inner wall according to an essentially concave curve, for example in the form of a semicircle or in a U-shape.
  • Fig. 1 is a view of a narrow side wall of a slab casting mold according to a first embodiment
  • Fig. 2 is a view of such a view according to a second embodiment.
  • FIG. 3 is a view of a broad side wall of a continuous slab casting mold.
  • 4 and 5 illustrate a section along the line IV-IV of FIG. 1 and according to the line V-V according to FIG. 2.
  • FIGS. 6, 8 and 9 show frontal views of the inner walls according to another embodiment.
  • Fig. 7 shows a section along the line VII-VII of Fig. 6.
  • the narrow side wall 1 of a continuous casting mold which is provided with internal cooling, is made of copper or a copper alloy.
  • a wear-resistant layer 4 which extends over the entire width 3, is applied in the outlet-side region 2 of this narrow side wall. This wear-resistant layer 4 extends over a length 5 of the mold with approximately 200 mm in the central region 6 of the side wall.
  • the total length 7 of the narrow side wall is 900 mm.
  • the wear-resistant layer extends over a greater length 10 (measured from the end), namely over a length of approximately 250 mm.
  • the entire width 3 of the side wall 1 is approximately 210 mm.
  • the limit curve of the wear-resistant layer is a concave curve 11 u. In between, it is formed approximately in the shape of a semicircle, the radius 12 of which corresponds to half the width 3.
  • the wear-resistant layer which has the following directional analysis: 0.9% carbon, 4.0% chromium, 9.5% molybdenum, 2.2% tungsten, 2.0% vanadium, the rest Iron and melting-related impurities, and which is applied in a thickness 13 of about 5 mm
  • the copper part of the narrow side wall 1 is provided with an intermediate layer 14, which has the following directional analysis: 0.02% carbon, 2.4% manganese, 0.75 % Silicon, 30.0% copper. 1% niobium, 1% iron, 0.25% titanium. Remainder nickel and melting-related impurities.
  • the hardness of the wear-resistant layer 4 is approximately 55 to 60 HRC.
  • the wear-resistant layer 4 in the central region 6 of the narrow side wall 1 with a width of 100 mm also extends over a length 5 of approximately 200 mm measured from the outlet-side end 15 of the narrow side wall.
  • the wear-resistant layer 4 extends in a length 10 of at least 250 mm. It is advantageous to guide the wear-resistant layer on these side regions 8, 9 up to the inlet-side end 16 of the narrow side wall.
  • the width 3 of the narrow side wall is approximately 210 mm.
  • the contour 11 of the wear-resistant layer is approximately U-shaped in the plan view of the narrow side wall 1.
  • the wear-resistant layer 4 is applied directly to the copper part of the narrow side wall 1, i. H. without intermediate layer 14, with brazing being chosen as the application method.
  • the chemical composition of the wear-resistant layer 4 corresponds approximately to that of a wear-resistant layer according to FIG. 1.
  • the wear of the wide side walls 17 is significantly less in relation to the wear of the narrow side walls.
  • a wear-resistant layer 4 can nevertheless be provided on the broad side walls, this wear-resistant layer 4 again being arranged only in the outlet region 2 of the broad side wall, as is shown in FIG. 3.
  • the wear-resistant layer is arranged according to FIG. 3 over a length 5 of 100 mm over the entire width 3, the mold length 7 being fixed at 900 mm and the width 3 of the broad side wall being set at around 1 750 mm.
  • a grid-like wear-resistant layer 18 extending over the entire width 3 is provided in the outlet-side region 2 of a narrow side wall.
  • This grid-shaped layer 18 extends over a length 5 of the mold of approximately 300 mm.
  • the total length 7 of the narrow side wall is 900 mm.
  • This wear-resistant layer advantageously consists of martensitic steel with a chromium and molybdenum content, wherein it advantageously contains 0.1 to 1.5% carbon, 2 to 20% chromium, 0.5 to 15% molybdenum and optionally up to 5% tungsten, contains up to 5% vanadium and up to 5% niobium, balance iron and melting-related impurities.
  • the wear-resistant layer is provided on an inner wall 1 as follows: First, grid-shaped grooves 19 with a depth 20 of approximately 7 to 10 mm are milled into the inner wall, whereupon the inner wall is preheated to a temperature of approximately 270 ° C. This temperature is below the recrystallization temperature of the material from which the inner wall is made. An intermediate layer 21 is provided in these grooves 19 in a thickness of approximately 4 mm, u. by deposition welding, which has the following directional analysis: 0.02% carbon, 2.4% manganese, 0.75% silicon, 30.0% copper, 1% niobium, 1% iron, 0.25% titanium, the rest nickel and contamination from melting.
  • the grooves 19 are then welded to the wear-resistant layer 18, cooled and finished.
  • the wear-resistant layer 18 has the following directional analysis: 0.9% carbon, 4.0% chromium, 9.5% molybdenum, 2.2% tungsten, 2.0% vanadium, remainder iron and impurities due to melting.
  • the lattice bars 22 forming the wear-resistant layer are inclined at an angle 24 of 45 ° to the vertical axis 23 of the inner walls * and the ratio of the distance 25 between two adjacent lattice bars 22 to the width 26 of a lattice bar 22 is four.
  • the width 26 of a lattice bar 22 is approximately 5 mm.
  • the areas made of the material of the inner walls lying between the lattice bars are of square shape according to FIG. 6.
  • the embodiment shown in FIG. 8 differs from that according to FIG. 1 in that in the central region 6 of the inner wall 1 the length 5 of the lattice-like wear-resistant layer 18 extends to approximately 150 mm, whereas in the side regions 8, 9 of the inner wall the wear-resistant one Layer is guided over a length 10 of about 300 mm.
  • the total length 7 of the inner wall is also approximately 900 mm.
  • a particularly advantageous method for arranging the lattice-like wear-resistant layer can be accomplished by pressing a lattice welded from square bars 22 of the wear material into the grooves after milling out the lattice-shaped grooves 19, whereupon the lattice is screwed from the rear of the inner walls by means of screws 27 is secured.
  • the invention is not limited to the exemplary embodiments shown, but can be modified in various respects, for example it can also be used for continuous casting molds with billet cross-section, all four mold inner walls advantageously being provided with a wear-resistant layer in the same way, whereas molds with a slab cross-sectional format in the first place the application of the wear-resistant layer for the narrow sides is important; the broad sides could also be formed without a wear-resistant layer because of the significantly lower wear.
  • Chromium plating which serves to prevent the absorption of copper in the melt
  • Chromium plating can be provided in the usual way on the inner walls of the mold after the wear-resistant layer has been applied. After application, this layer usually extends over the entire inner walls of the mold, but is quickly removed from the strand shell.

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

Claims (12)

1. Lingotière à passage continu pour une installation de coulée continue, notamment pour une installation de coulée continue de l'acier, comprenant des parois internes (1, 17) en cuivre ou en un alliage de cuivre, les parois internes (1, 17) étant munies d'une couche résistante à l'usure (4, 18) sur leur face dirigée vers la cavité de la lingotière, laquelle couche s'étend sur une partie de la longueur de la lingotière à partir de l'extrémité de sortie (15) de la lingotière, caractérisée en ce que la couche résistante à l'usure (4, 18) s'étend au maximum sur un tiers de la longueur (7) de la lingotière à partir de l'extrémité de sortie (15) de la lingotière, dans la région médiane (6) des parois internes (1, 17), tandis que, dans les régions latérales (8, 9) des parois internes (1, 17) qui donnent appui aux arêtes de la barre, elle s'étend au minimum sur la longueur (5) de la couche résistante à l'usure (4, 18) située dans la région médiane (6) et au maximum sur toute la longueur (7) de la lingotière, et la couche (4, 18) est composée d'acier martensitique résistant à l'usure contenant du chrome et du molybdène.
2. Lingotière à passage continu selon la revendication 1, caractérisée en ce que la couche résistante à l'usure (4, 18) contient 0,1 à 1,5 % de carbone, 2 à 20 % de chrome, 0,5 à 15 % de molybdène ainsi qu'éventuellement jusqu'à 5 % de tungstène, jusqu'à 5 % de vanadium et jusqu'à 5 % de niobium, le reste étant composé de fer et d'impuretés résultant de la fusion.
3. Lingotière à passage continu selon l'une des revendications 1 et 2, caractérisée en ce qu'entre la couche résistante à l'usure (4, 18) et la paroi interne (1, 17) est prévue une couche intermédiaire (14, 21) faite d'un alliage nickel-cuivre et appliquée sur la paroi interne par rechargement par soudure, et la couche résistante à l'usure (4, 18) est appliquée sur la couche intermédiaire, également par rechargement par soudure, sous une épaisseur de 3 à 10 mm.
4. Lingotière à passage continu selon la revendication 3, caractérisée en ce que la couche intermédiaire (14, 21) contient 1 à 5 % de manganèse, 0,5 à 1,5 % de silicium, 20 à 50 % de cuivre, le reste étant composé de nickel et d'impuretés résultant de la fusion, ainsi qu'éventuellement jusqu'a 5 % de niobium et/ou de fer et/ou de titane.
5. Lingotière à passage continu selon l'une des revendications 1 et 2, caractérisée en ce que la couche résistante à l'usure (4) est appliquée directement sur la paroi interne (1, 17), sans couche intermédiaire, par brasage dur.
6. Lingotière à passage continu selon les revendications 1 à 5, caractérisée en ce que la couche résistante à l'usure (18) est en forme de grille, les régions de la surface des parois internes (1, 17) qui sont situées entre les barreaux (22) de la grille de la couche résistante à l'usure (18) étant composées de la matière de base des parois internes.
7. Lingotière à passage continu selon la revendication 6, caractérisée en ce que les barreaux de grille (22) sont inclinés par rapport à l'axe vertical (23) de la lingotière, de préférence d'un angle (24) compris entre 30 et 60°.
8. Lingotière à passage continu selon la revendication 6 ou la revendication 7, caractérisée en ce que le rapport de la distance (25) entre deux barreaux de grille (22) à la largeur (26) d'un barreau de la grille (22) est compris dans l'intervalle allant de 3 à 5.
9. Lingotière à passage continu selon les revendications 6 à 8, caractérisée en ce que la couche d'usure (18) en forme de grille est formée de barreaux de grille (22) qui sont perpendiculaires entre eux et qui sont disposés au même écartement mutuel (25).
10. Procédé pour appliquer une couche résistante à l'usure selon les revendications 6 à 9, caractérisé en ce qu'on munit la paroi interne (1, 17) de rainures (19) disposées en grille, en ce qu'on forme une grille à partir de barreaux (22) de la couche résistante à l'usure (18) et que, ensuite, on enfonce cette grille à force dans les rainures (19) de la paroi interne.
11. Procédé selon la revendication 10, caractérisé en ce qu'on fixe la grille au moyen de vis (27), en partant de la face arrière des parois internes (1, 17).
12. Lingotière à passage continu selon la revendication 1, caractérisée en ce que la couche résistante à l'usure (4, 18) présente, en partant des régions latérales (8, 9) de la paroi interne vers la région médiane (6) de la paroi interne, une courbe (11) sensiblement concave, à peu près en demi-cercle ou en U.
EP83890186A 1982-11-04 1983-10-20 Lingotière à extrémités ouvertes pour une installation de coulée continue Expired EP0108744B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT402382A AT375571B (de) 1982-11-04 1982-11-04 Durchlaufkokille fuer eine stranggiessanlage
AT4023/82 1982-11-04
AT1320/83 1983-04-13
AT132083A AT377932B (de) 1983-04-13 1983-04-13 Durchlaufkokille fuer eine stranggiessanlage

Publications (3)

Publication Number Publication Date
EP0108744A2 EP0108744A2 (fr) 1984-05-16
EP0108744A3 EP0108744A3 (en) 1985-09-11
EP0108744B1 true EP0108744B1 (fr) 1988-08-17

Family

ID=25595524

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83890186A Expired EP0108744B1 (fr) 1982-11-04 1983-10-20 Lingotière à extrémités ouvertes pour une installation de coulée continue

Country Status (5)

Country Link
US (1) US4589468A (fr)
EP (1) EP0108744B1 (fr)
CA (1) CA1238762A (fr)
DE (1) DE3377700D1 (fr)
ES (1) ES285000Y (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018208558A1 (de) 2018-05-30 2019-12-05 Sms Group Gmbh Verfahren zum Herstellen von aus Kupfer oder einer Kupferlegierung bestehenden, plattenförmigen Innenwänden einer Stranggießkokille und Innenwand einer Stranggießkokille

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ES2378367T3 (es) * 2008-03-05 2012-04-11 Southwire Company Sonda de ultrasonidos con capa protectora de niobio
DE202009013126U1 (de) * 2009-09-29 2009-12-10 Egon Evertz Kg (Gmbh & Co.) Kokille zum Stranggießen
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US8652397B2 (en) 2010-04-09 2014-02-18 Southwire Company Ultrasonic device with integrated gas delivery system
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HUE045644T2 (hu) 2013-11-18 2020-01-28 Southwire Co Llc Ultrahang szondák gázkimenetelekkel fémolvadék gáztalanítására
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018208558A1 (de) 2018-05-30 2019-12-05 Sms Group Gmbh Verfahren zum Herstellen von aus Kupfer oder einer Kupferlegierung bestehenden, plattenförmigen Innenwänden einer Stranggießkokille und Innenwand einer Stranggießkokille

Also Published As

Publication number Publication date
ES285000U (es) 1985-09-01
US4589468A (en) 1986-05-20
CA1238762A (fr) 1988-07-05
EP0108744A2 (fr) 1984-05-16
EP0108744A3 (en) 1985-09-11
ES285000Y (es) 1986-05-01
DE3377700D1 (en) 1988-09-22

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