EP0709151B1 - Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden - Google Patents

Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden Download PDF

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Publication number
EP0709151B1
EP0709151B1 EP95402231A EP95402231A EP0709151B1 EP 0709151 B1 EP0709151 B1 EP 0709151B1 EP 95402231 A EP95402231 A EP 95402231A EP 95402231 A EP95402231 A EP 95402231A EP 0709151 B1 EP0709151 B1 EP 0709151B1
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EP
European Patent Office
Prior art keywords
dimples
casting
dimple
perimeter
circular
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
EP95402231A
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English (en)
French (fr)
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EP0709151A1 (de
Inventor
Hugues Legrand
Christian Marchionni
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 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 SA filed Critical Thyssen Stahl AG
Publication of EP0709151A1 publication Critical patent/EP0709151A1/de
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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
    • B22D11/05—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having adjustable walls
    • 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 the continuous casting of metals. More specifically, it concerns installations for the continuous casting of metals such as steel by solidification liquid metal on a movable wall or between two movable walls. These movable walls may, in particular, be constituted by the lateral surfaces of one or two cylinders with horizontal axis energized internally.
  • the pouring space containing the liquid steel is defined by the lateral surfaces of the cylinders, on which the solidification of the strip is initiated, and by plates of refractory side closures applied against the ends of the cylinders.
  • micro-cracks which have just been mentioned have their origin in the gradients thermal which are established in the skin of the product during its solidification against the cooled wall of the cylinder, and which generate stresses there.
  • a certain roughness is commonly printed on the surface of the cylinders. Of air (or inert gas blown and confined above the casting space) is trapped in the recessed parts of the surface before it comes into contact with liquid metal. It forms a gaseous "mattress" between the metal and the cylinder, and this mattress tends to decrease the cooling rate of the skin, so the gradients thermal.
  • the roughness also makes it possible to distribute the stresses and the deformations thermal on a scale such that they do not cause faults.
  • the protrusions would solidify while their presence on the strip is undesirable. If the dimples have suitable dimensions, the metal which penetrates there does not solidify there at once. The protrusions then constitute reserves of material which have a more plastic behavior than the neighboring portions of the skin solidified on the smooth parts of the cylinder. When cooling the skin which is accompanied by a contraction of the metal, these protrusions behave like expansion joints: They contract faster than their surroundings while absorbing the internal tensions in the skin resulting from its contraction, and which, without it, could lead to cracking of the surface of the strip. This contraction accentuated also makes that on the solidified and cooled strip, one no longer observes or practically more protuberances. So that these dimples can fully play their role, it is also necessary that the distances which separate them are maintained between lower and upper limits specified in this document, which depend on the diameter dimples.
  • Document EP409645 proposes to use as inerting gas space for pouring of the installation a gas partially soluble in the steel, to avoid the appearance of serrations on the surface of the strip, which would be due to an exaggerated expansion of the gas during the initiation of solidification, if it was completely insoluble. Conversely, a fully soluble gas may no longer play its role of mattress between the cylinder and band. It is proposed to use for this purpose, as soluble gas, nitrogen, hydrogen, carbon dioxide or ammonia, this soluble gas being mixed with argon or helium. The soluble gas content recommended in this mixture is 30 to 90%.
  • the object of the invention is to provide the dimples with a configuration which allows them to play their role in preventing micro-cracks with even greater efficiency increased compared to the practice of the Prior Art.
  • the invention relates to a casting surface of an ingot mold of continuous casting of moving wall metals, of the type having dimples in shape general circular or elliptical, characterized in that said dimples have lobes around their edges.
  • Said casting surface may, in particular, be constituted by the lateral surface of a cylinder or two cylinders cooled in rotation.
  • the invention consists in giving the dimples a form no longer circular or oval, but a lobed shape.
  • lobed form is meant that, at from a general shape at least approximately circular or elliptical, the around the dimples has portions where its radius of curvature is significantly smaller, in absolute value, than the mean radius of curvature of the dimple.
  • This perimeter can thus be constituted by an alternation of portions with low radius of curvature whose concavity is successively turned inwards and then towards the outside of the dimple.
  • lobed dimples according to the invention provide an increase in the length of the borders, therefore of this effect of cooling, for a surface of the dimples which remains identical to the Prior Art. In these conditions, the overall speed of cooling of the strip is not modified, since this depends, all other things being equal, on the percentage of the surface of the cylinders which is occupied by the dimple openings.
  • the circular dimple 1 according to the prior art shown in top view in FIG. 1 (we have neglected the deformations due to the curvature of the surface of the cylinder, whose radius, which is of the order of 250 to 750 mm, is very large compared to the dimensions of the dimples, which are of the order of mm or less) has a radius R, an area S (equal to ⁇ R 2 ) and a perimeter P (equal to 2 ⁇ R).
  • R radius
  • S equal to ⁇ R 2
  • P equal to 2 ⁇ R
  • This lobed dimple 2 is inscribed in a circle of radius R ', this radius R' being calculated so that the lobed dimple 2 has a surface S 'equal to the surface S of the preceding circular dimple 1.
  • the periphery of this lobed dimple 2 is in the form of an alternation of semicircles 3, 4, 5, 6, the concavities of which are turned towards the inside of the dimple, and of quarter circles 7, 8, 9, 10 whose concavities are turned towards the outside of the dimple.
  • the radius of curvature "a" of semicircles 3-6 and the radius of curvature "a"'of quarter circles 7-10 are both equal to R' / 3.
  • the ratio P '/ S' is equal to 2.95 / R ', that is, expressed as a function of the radius R of the circular surface dimple equivalent, at 2.43 / R, while P / S for this circular dimple would only be equal to 2 / R. So we have, with a lobed dimple, a perimeter significantly greater than that a circular dimple of equivalent surface, which increases the anti-micro-cracking effect sought during the solidification of the strip.
  • dimples can be formed on the copper ferrule, which constitutes usually the outer surface of the cylinders, for example by rolling a wheel bearing a relief engraving reproducing their shape.
  • This engraving repels the shell material on the desired depth (which is of the order of 5 to 100 ⁇ m as usually), and therefore causes the appearance of reliefs on the edges of the dimples. It is then necessary to rectify the surface of the shell in order to eliminate these reliefs.
  • dimples that has been described and represented is not limiting, and other types of lobed dimples, having different shaped lobes and / or in number are possible. Instead of being written exactly in a circle, dimples may only be approximately, or also be included in a ellipse. Optimally, it is recommended that the lobed dimples have a perimeter P ' between 1.1 and 1.5 times the perimeter P of circular dimples which would have a identical unit area. If P 'is less than 1.1 times P, the gain obtained is too low and not detectable.
  • the invention is not only applicable to cylinders intended to equip a steel casting machine between two cylinders, but also on any casting surface of a ingot mold with movable wall (s), such as the surface of a cylinder of a casting machine very thin strips on a rotating cylinder, or that of a strip on a pouring of metal between two moving bands

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)

Claims (5)

  1. Gußformoberfläche für eine Metallstranggießkokille mit beweglicher Wand, welche im allgemeinen kreisförmige oder elliptische Beulen aufweist, dadurch gekennzeichnet, dass der Umfang dieser Beulen Abschnitte aufweist, deren Absolutwert des Krümmungsradius geringer ist als der mittlere Krümmungsradius der Beule.
  2. Gußformoberfläche nach Anspruch 1, dadurch gekennzeichnet, dass der Umfang durch eine Folge von Abschnitten mit geringem Krümmungsradius gebildet wird, deren konkave Wölbungen abwechselnd zum Inneren und zum Äußeren der Beule hin gerichtet sind.
  3. Gußformoberfläche nach Ansprüchen 1 oder 2, dadurch gekennzeichnet, dass die Beulen eine Umfangslänge aufweisen, die zwischen 1,1 und 1,5 mal der Umfangslänge einer kreisförmigen Beute mit äquivalenter Oberfläche liegt.
  4. Gußformoberfläche nach Ansprüchen 1 bis 3, dadurch gekennzeichnet, dass sie aus der seitlichen Oberfläche einer gekühlten sich drehenden Walze besteht.
  5. Gußformoberfläche nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass sie aus den seitlichen Oberflächen zweier gekühlten Walzen besteht, die sich gegenläufig drehen und die zwischen sich einen Gießraum bilden.
EP95402231A 1994-10-31 1995-10-06 Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden Expired - Lifetime EP0709151B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9413028 1994-10-31
FR9413028A FR2726209B1 (fr) 1994-10-31 1994-10-31 Surface de coulee d'une lingotiere de coulee continue des metaux a paroi mobile

Publications (2)

Publication Number Publication Date
EP0709151A1 EP0709151A1 (de) 1996-05-01
EP0709151B1 true EP0709151B1 (de) 1999-09-08

Family

ID=9468385

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95402231A Expired - Lifetime EP0709151B1 (de) 1994-10-31 1995-10-06 Gussformoberfläche für eine Metallstranggiesskokille mit beweglichen Wänden

Country Status (10)

Country Link
EP (1) EP0709151B1 (de)
JP (1) JPH08206791A (de)
KR (1) KR960013520A (de)
AT (1) ATE184226T1 (de)
AU (1) AU689632B2 (de)
DE (1) DE69511984T2 (de)
DK (1) DK0709151T3 (de)
ES (1) ES2137467T3 (de)
FR (1) FR2726209B1 (de)
GR (1) GR3032048T3 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1295859B1 (it) * 1997-11-12 1999-05-28 Acciai Speciali Terni Spa Rullo di raffreddamento per macchine di colata continua
DE60131034T3 (de) 2000-05-12 2013-08-29 Nippon Steel & Sumitomo Metal Corporation Gekühlte giesswalze zum kontinuierlichen stranggiessen von dünnen produkten und stranggiessverfahren
AU2008100847A4 (en) 2007-10-12 2008-10-09 Bluescope Steel Limited Method of forming textured casting rolls with diamond engraving

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2037232T3 (es) * 1987-09-24 1993-06-16 Nippon Steel Corporation Tambor de refrigeracion para maquinas de colada continua para fabricar fleje metalico delgado.
US5103895A (en) 1989-07-20 1992-04-14 Nippon Steel Corporation Method and apparatus of continuously casting a metal sheet
JP3058185B2 (ja) * 1990-01-12 2000-07-04 新日本製鐵株式会社 オーステナイト系ステンレス薄肉連続鋳造鋳片
JPH082484B2 (ja) * 1990-10-19 1996-01-17 新日本製鐵株式会社 表面品質の優れたオーステナイト系ステンレス鋼薄帯状鋳片、薄板の製造方法および薄帯状鋳片
US5391856A (en) * 1991-01-11 1995-02-21 Nippon Steel Corporation Cooling drum for casting thin cast pieces and method and apparatus for forming dimples in peripheral surface of the drum

Also Published As

Publication number Publication date
DE69511984T2 (de) 2000-05-18
FR2726209A1 (fr) 1996-05-03
AU689632B2 (en) 1998-04-02
JPH08206791A (ja) 1996-08-13
EP0709151A1 (de) 1996-05-01
GR3032048T3 (en) 2000-03-31
AU3316495A (en) 1996-05-09
DE69511984D1 (de) 1999-10-14
ATE184226T1 (de) 1999-09-15
ES2137467T3 (es) 1999-12-16
KR960013520A (ko) 1996-05-22
FR2726209B1 (fr) 1996-11-29
DK0709151T3 (da) 2000-04-03

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