EP0856368B1 - Walzenring zum Stranggiessen von Metallen oder metallischen Legierungen, insbesondere für Aluminium - Google Patents

Walzenring zum Stranggiessen von Metallen oder metallischen Legierungen, insbesondere für Aluminium Download PDF

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Publication number
EP0856368B1
EP0856368B1 EP98400020A EP98400020A EP0856368B1 EP 0856368 B1 EP0856368 B1 EP 0856368B1 EP 98400020 A EP98400020 A EP 98400020A EP 98400020 A EP98400020 A EP 98400020A EP 0856368 B1 EP0856368 B1 EP 0856368B1
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EP
European Patent Office
Prior art keywords
hoop
thermal
steel
continuous casting
cylinder
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
EP98400020A
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English (en)
French (fr)
Other versions
EP0856368A1 (de
Inventor
Georges Odin
Gérard Vidalenc
Maxime Laugier
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.)
AKERS FRANCE
Original Assignee
Akers France
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Publication date
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Publication of EP0856368A1 publication Critical patent/EP0856368A1/de
Application granted granted Critical
Publication of EP0856368B1 publication Critical patent/EP0856368B1/de
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 invention relates to a steel for casting cylinder hoops continuous aluminum presenting, compared to steels currently known, an improved lifespan without any deterioration of the plant productivity.
  • Continuous casting machines for aluminum, or alloys aluminum consist of 2 rotating cylinders between which is introduces the liquid metal. In some recent installations, these 2 cylinders are supported on 2 larger support cylinders. Cylinders in contact with the liquid metal are designed to solidify it and form a sheet which undergoes or may undergo further hot rolling allowing it to be collected in the form of a reel.
  • the cylinders are formed by a central part (core) carrying circuits of cooling and a hoop mounted on the core by hooping or any other way.
  • the inner surface of the hoop is cooled by circulating water in the cooling channels carried by the core.
  • the primary role of fret is thus to extract the calories from the liquid aluminum to allow solidification before leaving the right-of-way between the cylinders.
  • the fret is, moreover, subject to stresses intense thermomechanics due to thermal cycling and stresses mechanical origin: mounting constraints, especially hooping resulting from the design of the cylinders - bending and torsional stresses due to work in service. These stresses cause fatigue surface plastic, initiating and spreading a network of microcracks, which require periodic repair of the hoop, by machining. The lifespan of a hoop therefore essentially depends on its ability to withstand thermal stresses.
  • the object of the present invention is to propose a new hoop of continuous aluminum casting which ensures high productivity of the installation similar to those of the frets currently used, with a longer operating life than the best current products, thanks to the use of a steel combining Cr and Mo with high contents.
  • Figure 1 is a schematic view of a casting installation continuous horizontal.
  • FIG. 2 is a schematic view in side elevation and in partial section of part of the installation of fig. 1.
  • Figure 3 shows the temperatures measured at different points of the section of a hoop during operation.
  • Figure 4 is a diagram illustrating the stress cycle in function of the elongation undergone by the metal of the hoop.
  • the principle of light alloy continuous casting shown on the Figures 1 and 2 relates to so-called horizontal casting with 2 cylinders.
  • Aluminum, aluminum alloy, copper, copper alloy, molten in an oven which is not shown is kept at a constant level in a supply channel 1 and introduced, by means of a base 2, between two cylinders 3, at a temperature close to the melting temperature, and around 680 ° C for aluminum.
  • the cylinders 3 are driven in rotation in opposite directions with a spacing which determines the thickness of the solidified sheet 4. This can vary between 12 mm and 2 mm in the most recent installations.
  • the rolling right of way constitutes a continuous ingot mold in which, in contact with the cooled cylinders, aluminum solidifies while it is driven by the rotation of cylinders.
  • Each cylinder has a cooling circuit traversed by a fluid, generally water.
  • Each cylinder is made in 2 parts, namely: A core 5 which is a steel cylinder in which are formed longitudinal channels 6, supply and outlet of water by the pins 7. These channels supply, by radial channels 8, peripheral grooves 9 coming into contact direct the hoop 10 with the cooling fluid.
  • This hoop constitutes the consumable part of the cylinder. Its primary role is to extract the calories from the solidifying alloy. It is understood that the productivity of the casting machine is directly linked to the capacity for transferring calories through the hoop.
  • the hoop is subjected to thermomechanical stresses intense.
  • the stress regime at each point of the frets is defined by the combination of mechanical constraints and constraints of thermal origin due to thermal cycling.
  • the stress cycle is illustrated in Figure 4.
  • the first temperature rise is represented by the line OA, then the curve AB, which corresponds to the plastic deformation on the stress diagram deformation of Figure 4.
  • the present invention results from work which has shown that the heat transfer capacity of the hoop depended not only on the ambient thermal conductivity of the material, but many other parameters such as diffusivity D, specific heat Cp, density ⁇ . In addition, these are essentially the values reached by these parameters in the surface layers of the hoop, in contact with liquid aluminum and brought to temperatures of the order of 600 ° C, which have a predominant influence on the heat exchanger capacity thermal of the hoop.
  • the copper element influences the oxidability of the hoop steel; the chromium, molybdenum, vanadium, carburigens, which precipitate in association with carbon, influence hot and cold hardness.
  • the molybdenum pushes back the softening temperature of the steel and the vanadium elevates the characteristics when hot.
  • the model makes it possible to calculate the temperature "map" of the hoop with an excellent approximation compared to the experimental measurement. Similarly, the agreement between calculated values and experimental values is very good with regard to the heat output of the exchanger, the rate of heating of the outer layers in the contact arc, the thermal gradient in the hoop.
  • the heat output of the exchanger is representative of the productivity of the installation. Speed temperature and the thermal gradient are important parameters for thermal fatigue.
  • Tests have been carried out for various hoop steels in parallel with thermal fatigue resistance tests on a specific device described below.
  • This device includes a test tube finely rectified cylindrical which is intermittently heated in surface by high frequency induction and that is, permanently, internally cooled by water circulation.
  • test piece The definition of the test piece, the power of the generator, the self test tube coupling, cooling allowed to define a cycle thermal very representative of the real thermal cycle undergone by the layers external of the hoop, as it is known through the measurements of temperatures recorded on actual frets in operation, and at through the thermomechanical model described above.
  • the criterion used is the number and depth of the cracks observed, after a number of given cycles, on a specimen cut for 10 linear mm in area. Previous tests have shown the excellent correlation between results of this test and those of actual frets in service.
  • the frets for continuous casting according to the present invention are made from a steel grade produced in an electric oven, poured in a vacuum bag where it is refined and degassed, then finally poured into mold.
  • the ingots obtained are heated to approximately 1200 ° C., drilled at hot to obtain blanks which are themselves forged into tubes of 400 mm to 1300 mm in diameter depending on the final dimensions of the fret to get. These blanks are then annealed, machined, then quenched (austenization 1030 ° C) and returned to obtain quality metallurgical required.
  • Table III indicates the physical characteristics obtained at different temperatures.
  • "THERMAL” CHARACTERISTICS Previous Technique (Average 1 - 2) Medium Invention 3 - 4 Density ⁇ (10 3 .kg. M -3 ) Specific heat Cp (10 3 .Jk g -10. ° C -1 ) Diffusivity D (10 -6 m 2.
  • S -1 Conductivity K (Wm -1 . ° C -1 ) Density ⁇ (10 3 .kg. M -3 ) Specific heat Cp (10 3 .Jk g -10. ° C -1 ) Diffusivity D (10 -6 .m 2.
  • S -1 Conductivity K (Wm -1 .
  • the steel according to the invention presents an evolution surprising conductivity and diffusivity as a function of the temperature: significantly lower than the values measured for steel reference to the ambient, they become equivalent to or even greater than those of the reference steel as soon as the temperature reaches 400 ° C about.
  • Table IV gives the results obtained for hoops 80 mm thick (new) and 30 mm thick (usual scrap rating).
  • Thermal simulation results Prior art Steel according to the invention New fret ⁇ scrap New fret ⁇ scrap Unchanged power 323 kw 367 kw 315 kw 364 kw Maximum surface temperature 416 ° C 389 ° C 425 ° C 397 ° C Minimum surface temperature 103 ° C 24 ° C 108 ° C 26 ° C
  • the average temperature of the hoop according to the invention is slightly greater than that of the reference.
  • Table V gives the results of the thermal fatigue tests. Thermal fatigue tests - Crack length after 3000 cycles shading Cumulative length ⁇ m Average length ⁇ m Maximum length ⁇ m - 1 - Prior art 425 43 98 - 2 - Prior art 1035 96 371 - 3 - According to invention ⁇ 50 ⁇ 15 ⁇ 20 - 4 - According to invention ⁇ 50 ⁇ 15 ⁇ 20
  • the steel according to the invention presents a considerable improvement in the resistance to thermal fatigue, quite surprising because much higher than hoped for increasing the Mo content and the yield strength when hot.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Articles (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Clamps And Clips (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (2)

  1. Walzenring zum Stranggiessen von Metallen oder metallischen Legierungen, insbesondere für Aluminium, dadurch gekennzeichnet, dass er aus einem Stahl hergestellt wird mit der folgenden Zusammensetzung in Gewichtsprozent:
    Kohlenstoff: 0,25 bis 0,35%
    Mangan: 0,30 bis 0,60%
    Silizium: 0,15 bis 0,45%
    Nickel: weniger als 0,40%
    Chrom: 2,90 bis 3,5%
    Molybdän: 2,5 bis 3,1%
    Vanadium: 0,3 bis 0,70%
    Schwefel: ≤ 0,020%
    Phosphor: ≤ 0,020%
    Kupfer: ≤ 1%
    wobei der Rest im Wesentlichen aus Eisen und restlichen Verunreinigungen besteht.
  2. Walzenring nach Anspruch 1, dadurch gekennzeichnet, dass der Stahl die folgende Zusammensetzung hat:
    Kohlenstoff: 0,28 bis 0,32%
    Mangan: 0,30 bis 0,50%
    Silizium: 0,15 bis 0,35%
    Nickel: weniger als 0,25%
    Chrom: 3,0 bis 3,2%
    Molybdän: 2,7 bis 2,9%
    Vanadium: 0,45 bis 0,55%
    Schwefel: ≤ 0,015%
    Phosphor: ≤ 0,020%
    Kupfer: 0,1 bis 0,5%
    wobei der Rest im Wesentlichen aus Eisen und restlichen Verunreinigungen besteht.
EP98400020A 1997-01-29 1998-01-08 Walzenring zum Stranggiessen von Metallen oder metallischen Legierungen, insbesondere für Aluminium Expired - Lifetime EP0856368B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9700918A FR2758751B1 (fr) 1997-01-29 1997-01-29 Frette de coulee continue de metal ou alliage metallique, notamment d'aluminium
FR9700918 1997-01-29

Publications (2)

Publication Number Publication Date
EP0856368A1 EP0856368A1 (de) 1998-08-05
EP0856368B1 true EP0856368B1 (de) 2002-07-17

Family

ID=9503065

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98400020A Expired - Lifetime EP0856368B1 (de) 1997-01-29 1998-01-08 Walzenring zum Stranggiessen von Metallen oder metallischen Legierungen, insbesondere für Aluminium

Country Status (6)

Country Link
US (1) US5948354A (de)
EP (1) EP0856368B1 (de)
AT (1) ATE220583T1 (de)
DE (1) DE69806521T2 (de)
ES (1) ES2178117T3 (de)
FR (1) FR2758751B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8303892B2 (en) * 2008-10-22 2012-11-06 Shultz Steel Company Composition and method of forming high productivity, continuous casting roll shell alloy
IT201700036965A1 (it) * 2017-04-04 2018-10-04 Bruno Presezzi S P A Struttura di camicia per rulli di colata continua, particolarmente per la produzione di nastri in alluminio o in lega di alluminio e di nastri in leghe a base di zinco

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578768B1 (fr) * 1985-03-15 1988-05-06 C3F Comp Franc Forges Fond Frettes de rouleaux de coulee continue
US5599497A (en) * 1995-07-26 1997-02-04 National-Oilwell, L.P. Alloy steel roll caster shell

Also Published As

Publication number Publication date
EP0856368A1 (de) 1998-08-05
FR2758751B1 (fr) 1999-02-26
DE69806521T2 (de) 2003-03-06
US5948354A (en) 1999-09-07
ATE220583T1 (de) 2002-08-15
FR2758751A1 (fr) 1998-07-31
DE69806521D1 (de) 2002-08-22
ES2178117T3 (es) 2002-12-16

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