EP0493290B1 - Paroi mobile d'une installation de coulée continue et son procédé de réalisation - Google Patents

Paroi mobile d'une installation de coulée continue et son procédé de réalisation Download PDF

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Publication number
EP0493290B1
EP0493290B1 EP91470039A EP91470039A EP0493290B1 EP 0493290 B1 EP0493290 B1 EP 0493290B1 EP 91470039 A EP91470039 A EP 91470039A EP 91470039 A EP91470039 A EP 91470039A EP 0493290 B1 EP0493290 B1 EP 0493290B1
Authority
EP
European Patent Office
Prior art keywords
metal
relief
wall
thickness
basis
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
EP91470039A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0493290A1 (fr
Inventor
Georges Raisson
Jean-Michel Damasse
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.)
Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Stahl AG
USINOR Sacilor SA
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 Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Stahl AG
Publication of EP0493290A1 publication Critical patent/EP0493290A1/fr
Application granted granted Critical
Publication of EP0493290B1 publication Critical patent/EP0493290B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B22D11/06—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 present invention relates to the continuous casting of metals, in particular steel, on one or between two movable walls, in particular on one or between two cylinders driven in rotation.
  • This type of casting is already known, which consists in bringing molten metal into contact with a cooled moving moving surface. On contact with this cold surface, the cast metal solidifies and is driven by the scrolling movement of the surface.
  • One of the known problems of this type of casting is to ensure uniform solidification of the metal in contact with the cooled surface, this problem being generated by the fact that during contact of the molten metal with the cooled surface, the metal shrinks in solidifying, this constriction causing localized detachments of the skin of solidified metal relative to the casting surface. It follows that in the areas where this separation occurs, the cooling of the metal is slowed down compared to the areas where the skin remains in good contact with the cooled surface. It appeared that on a smooth surface, these phenomena occurred in a disorderly manner, thus causing irregularities as much in the appearance of the surface of the cast product as in its structure, and being able to cause defects such as surface cracks.
  • pouring surfaces having particular roughness characteristics makes it possible to obtain better quality products, in particular on the surface.
  • the surface of the cast product has a substantially complementary roughness; as a result, at the level of the hollows in the roughness of the cast product, crack initiators which can propagate and render the product unfit for any use.
  • the object of the present invention is to solve these problems, and more particularly to obtain a product which does not have the abovementioned surface defects.
  • the object of the present invention is to solve the aforementioned problems, while ensuring the retention and / or the training of the skin of solidified metal during casting.
  • the invention relates to a movable wall of a continuous metal casting installation as defined in claim 1 attached.
  • the wall according to the invention can thus have a much less roughness than that according to the prior art, which avoids marking the surface of the cast product, while retaining the advantages of casting on a rough surface in terms of homogeneity of the cooling of the cast product.
  • the invention therefore provides a composite casting surface with a variable and controlled local heat transfer coefficient which allows, during the solidification and cooling of the first skin of the cast metal, to ensure a homogeneous distribution of the priming sites for nucleation. , these sites corresponding to the emergence of the base metal with high thermal conductivity, this homogeneous distribution conditioning the homogeneity of the cooling of the product.
  • the emergences of the base metal are in relief relative to the surface of the intermediate zones. Therefore, the apexes of the emergences constitute anchor peaks for retaining the skin of cast metal during solidification, but the roughness of the surface of the wall is much less than in rough walls according to the prior art. , which prevents the initiation of cracks on the surface of the cast product.
  • the "pointed" hollows in the relief of rough surfaces according to the prior art, obtained by means mentioned above, are eliminated, which avoids the random fouling of these hollows or pits.
  • the invention also relates to a method according to claim 6 of a movable wall as defined above.
  • the machining can be continued until either a predetermined ratio between the area of the free surfaces of the base metal and that of the filler metal is obtained, or a predetermined remaining thickness of the filler metal. in the reliefs of the base metal.
  • a predetermined ratio between the area of the free surfaces of the base metal and that of the filler metal is obtained, or a predetermined remaining thickness of the filler metal. in the reliefs of the base metal.
  • we continue machining until the thickness of the filler metal in the hollows in the relief of the base metal is such that the thermal conductance of a layer of this thickness of the filler metal is equivalent to that of a air layer about 50 ⁇ m thick.
  • FIG. 1 very schematically represents a roughness profile of the surface of a casting wall 1 according to the prior art, for example the energetically cooled wall of a casting cylinder in a steel casting installation between cylinders.
  • This profile can for example be obtained by knurling or machining.
  • the height of the relief voluntarily imparted to this surface is approximately 300 ⁇ m.
  • the representation which is made of it is purely didactic to facilitate the explanation which follows, and it will be easily understood that the actual roughness is much less regular than that represented, in particular the distance d between two neighboring roughness peaks not being not on the same scale as the height of these peaks, this distance can be of the order of a millimeter.
  • the idea underlying the invention is to avoid this problem by eliminating or at least reducing these peaks, while retaining the advantages resulting from the presence of more insulating zones between these peaks .
  • the wall 1 ′ has protrusions 4 of the base metal constituting the wall, this metal having a high thermal conductivity, such as for example copper or a copper alloy. Between these emergences are intermediate zones 5 made of a metal of lower thermal conductivity, for example nickel or a nickel alloy, the free surface 6 of which is at the same level as the apex of the emergences 4, so as to form a generally smooth surface, that is to say - say whose roughness is for example less than 15 ⁇ m.
  • a metal of lower thermal conductivity for example nickel or a nickel alloy
  • a typical method of manufacturing this wall consists in producing on the surface of the base metal, for example by machining, knurling or electroerosion, a relief having for example a height of approximately 0.5 mm. One then proceeds to electrochemical nickel plating of the surface obtained over a thickness greater than the relief created, so that the layer 7 of nickel or nickel alloy deposited completely covers the relief (see FIG. 2).
  • the wall surface is machined again until the base metal appears, so as to obtain a smooth copper-nickel composite surface, as shown in FIG. 3, and part of the filler metal is dissolved, so as to allow peaks of the base metal to protrude relative to the surface of the intermediate zones.
  • the height of the relief, produced on the base metal during the first phase of the process depends on the thickness finally desired of the intermediate zones 5.
  • This final thickness is determined beforehand so that a layer of metal of contribution, here an alloy with a high nickel content, having this thickness being equivalent from the point of view of thermal conductance to an air layer of 10 to 90 ⁇ m thick.
  • FIG. 4a represents the roughness profile obtained by machining the base metal of the wall. It will be noted that this profile is here represented more closely to reality than in FIGS. 1 to 3.
  • Figure 4b equivalent to Figure 2, shows a section of the surface after deposition of the filler metal electrochemically, by a known technique.
  • the wall is then machined until the first peaks 8 of the base metal appear ( Figure 4c).
  • the machining is then stopped, and a filler metal is then dissolved by a known method (for example an electrolytic path with low amperage) so as to reduce the thickness of this metal in the hollows or valleys of the relief, while retaining the base metal peaks which emerge weakly above the free surface 7 'of the filler metal, as shown in FIG. 4 d which represents the finished surface.
  • a known method for example an electrolytic path with low amperage
  • the previously described beneficial effects of a composite surface are preserved, and the emerging peaks 8 participate in the retention and / or entrainment of the metal skin during solidification, it being understood that the number and / or the height of these peaks, above the surface 7 ′ of the zones are much less than for the rough walls according to the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Casting Devices For Molds (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Details Of Cameras Including Film Mechanisms (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Laminated Bodies (AREA)
EP91470039A 1990-12-24 1991-12-13 Paroi mobile d'une installation de coulée continue et son procédé de réalisation Expired - Lifetime EP0493290B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9016526A FR2670695A1 (fr) 1990-12-24 1990-12-24 Paroi mobile d'une installation de coulee continue et son procede de realisation.
FR9016526 1990-12-24

Publications (2)

Publication Number Publication Date
EP0493290A1 EP0493290A1 (fr) 1992-07-01
EP0493290B1 true EP0493290B1 (fr) 1996-08-21

Family

ID=9403862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91470039A Expired - Lifetime EP0493290B1 (fr) 1990-12-24 1991-12-13 Paroi mobile d'une installation de coulée continue et son procédé de réalisation

Country Status (8)

Country Link
EP (1) EP0493290B1 (enrdf_load_stackoverflow)
AT (1) ATE141533T1 (enrdf_load_stackoverflow)
DE (2) DE69121544T2 (enrdf_load_stackoverflow)
DK (1) DK0493290T3 (enrdf_load_stackoverflow)
ES (1) ES2091894T3 (enrdf_load_stackoverflow)
FI (1) FI95879C (enrdf_load_stackoverflow)
FR (1) FR2670695A1 (enrdf_load_stackoverflow)
GR (1) GR3021561T3 (enrdf_load_stackoverflow)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4688623A (en) * 1981-12-21 1987-08-25 Atlantic Richfield Company Textured silicon ribbon growth wheel
JPS58145342A (ja) * 1982-02-22 1983-08-30 Nippon Kokan Kk <Nkk> 連続鋳造設備用ロ−ル装置
JPS5939455A (ja) * 1982-08-31 1984-03-03 Nippon Kokan Kk <Nkk> 高温鋳片搬送用ロ−ラ

Also Published As

Publication number Publication date
FI95879B (fi) 1995-12-29
ATE141533T1 (de) 1996-09-15
FI916119A0 (fi) 1991-12-23
FR2670695A1 (fr) 1992-06-26
ES2091894T3 (es) 1996-11-16
FI95879C (fi) 1996-04-10
FR2670695B1 (enrdf_load_stackoverflow) 1994-12-16
GR3021561T3 (en) 1997-02-28
DE69121544T2 (de) 1997-02-06
EP0493290A1 (fr) 1992-07-01
DK0493290T3 (enrdf_load_stackoverflow) 1997-01-20
FI916119A7 (fi) 1992-06-25
DE69121544D1 (de) 1996-09-26
DE4141484A1 (de) 1992-06-25

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