EP0410294B1 - Verfahren und Vorrichtung zur Wärmebehandlung von Metallband - Google Patents

Verfahren und Vorrichtung zur Wärmebehandlung von Metallband Download PDF

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Publication number
EP0410294B1
EP0410294B1 EP90113801A EP90113801A EP0410294B1 EP 0410294 B1 EP0410294 B1 EP 0410294B1 EP 90113801 A EP90113801 A EP 90113801A EP 90113801 A EP90113801 A EP 90113801A EP 0410294 B1 EP0410294 B1 EP 0410294B1
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EP
European Patent Office
Prior art keywords
enclosure
strap
strip
gas
treatment
Prior art date
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EP90113801A
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English (en)
French (fr)
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EP0410294A1 (de
Inventor
André Reiniche
Philippe Sauvage
Paul Van Den Berghe
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Compagnie Generale des Etablissements Michelin SCA
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Compagnie Generale des Etablissements Michelin SCA
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C21D9/54—Furnaces for treating strips or wire
    • C21D9/56—Continuous furnaces for strip or wire
    • C21D9/561—Continuous furnaces for strip or wire with a controlled atmosphere or vacuum
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length

Definitions

  • the invention relates to methods and devices for heat treating metal strips.
  • French patent applications 88/00904 (FR-A-2 626 290) and 88/08425 (FR-A-2 632 973) describe methods and devices for carrying out pearlitization and austenitization treatments for threads metallic using tubes which contain gases practically without forced ventilation.
  • the object of the invention is to generalize these advantages in the case of the heat treatment of metal strips.
  • the invention relates to a method defined by main claim 1 for a method, and to a device defined by main claim 9 for a device.
  • the strips treated according to the invention can be used for example to reinforce articles, in particular tire casings.
  • strip should be taken in a general sense and includes any elongated element having a section perpendicular to its longitudinal direction which has a width significantly greater than its thickness, this element possibly having the shape of a substantially flat plate, or the shape of a profile.
  • the ratio between the width of the strip and its thickness is at least equal to 10, the width of the strip being determined by following the surface of the strip, on its section perpendicular to its longitudinal direction.
  • Figures 1 and 2 show a device 100 according to the invention for heat treatment of a metal strip 1.
  • Figure 1 is a section of the device 100 made along the length of the strip and
  • Figure 2 is a section of this device perpendicularly the length of the strip.
  • the section in FIG. 1 is shown diagrammatically by the straight line segments I-I in FIG. 2, and the section in FIG. 2 is shown diagrammatically by the straight line segments II-II in FIG. 1.
  • the device 100 making it possible to heat treat the strip 1, comprises an enclosure 2 containing a gas 3 practically devoid of forced ventilation.
  • the device 100 includes means for scrolling the strip 1 in the enclosure 2, these means, not shown for the purpose of simplification being known means, for example rolls on which the strip 1 is wound at least one of these rollers being driven by a motor.
  • the device 100 comprises a heat transfer fluid 4 circulating at the outside of the enclosure 2 in the hollow casing 5 surrounding the enclosure 2.
  • the heat transfer fluid 4 arrives in the casing 5 through the pipe 6, and exits through the pipe 7, the circulation of the heat transfer fluid 4 being shown diagrammatically by the arrows F4 in Figure 1.
  • the known means used to circulate the fluid 4 are not shown for the purpose of simplification, these means comprising for example a pump.
  • the fluid 4 is for example water.
  • heat transfer takes place between the strip 1 and the walls 2a of the enclosure 2, situated opposite the strip 1, by means of the gas 3.
  • the heat transfer also takes place between the walls 2a and the fluid 4.
  • the enclosure 2 and the casing 5 are produced with heat conducting materials, for example metallic materials, the transfer taking place from the strip 1 to the fluid 4, in the case of a strip cooling treatment 1.
  • Guides 8 for example made of ceramic, guide the strip 1.
  • K T J VS x E2 J being the adjustable thickness expressed in millimeters of the gas layer 3 between the strip 1 and the enclosure 2, E being the thickness of the strip expressed in millimeters, C being the thermal conductivity of the gas 3 determined at 600 ° C and expressed in watts.m ⁇ 1. . K ⁇ 1.
  • J is at least equal to 0.2 mm and at most equal to 2 mm.
  • K T is chosen as a function of the heat treatment to be carried out as described later.
  • the width of the strip 1 is represented by L.
  • the gas 3 can be of very diverse nature, for example hydrogen, nitrogen, helium, a mixture of hydrogen and nitrogen, hydrogen and methane, nitrogen and methane, helium and methane, hydrogen, nitrogen and methane.
  • the strip 1 shown in Figures 1 and 2 has the shape of a flat plate, but the invention applies to cases where the strip has a shape which is not planar.
  • the device 200 according to the invention, represented in FIG. 3, makes it possible to treat a strip 1 having a square shape, the enclosure 2 then being adapted so that there is a practically constant thickness J gas 3 between the strip 1 and the enclosure 2 which is for example itself arranged in the outer casing 5 of cylindrical shape.
  • the thickness J can be adapted to the heat treatment to be carried out or to the strip.
  • the thickness J is adjusted with the aid of rods 12 of semi-cylindrical section rotating around an axis 0, which modifies the distance between the walls 2a of the enclosure 2.
  • Other means can be used, for example screws.
  • Figures 3 and 4 are sections made respectively perpendicular to the longitudinal direction of the strip 1, and longitudinally.
  • FIG. 5 represents another device 400 according to the invention, FIG. 5 being a top view of the device, the casing 5 being assumed to be removed.
  • Each wall 2a has fins 20 arranged on the side of the fluid 4 to improve the heat exchanges between the wall 2a and the fluid 4.
  • These fins 20 have an orientation perpendicular to the longitudinal direction of the strip 1, shown diagrammatically by the arrow F.
  • Deflectors 21 allow the fluid 4 to flow in a baffle between the inlet pipe 6 and the outlet pipe 7. This arrangement makes it possible to promote heat exchanges between the strip 1 and the fluid 4.
  • FIG. 6 shows four fins 20 in section along a plane perpendicular to the strip 1, in the longitudinal direction of this strip. It can be seen in FIG. 6 that the fins 20 have a height H between the enclosure 2 and the seal 9, these fins being separated by the distance R, the thickness of the fins being represented by Ea.
  • FIG. 7 represents seen from above the circulation of the heat transfer fluid 4 of another device 500 according to the invention.
  • This device 500 is similar to the device 400 with the difference that the fins 20 are oriented along the length of the strip, that is to say parallel to the arrow F, the supply 6 and the outlet 7 of the fluid 4 taking place on the same side of the device with respect to the direction of travel F.
  • the fluid 4 flows parallel to the length of the strip but in opposite direction sections thanks to one / or more deflectors 21, also arranged in the direction of the length of the strip, only one of these deflectors 21 being shown in Figure 7 for the sake of simplification.
  • the invention also relates to devices devoid of heat transfer fluids such as, for example, the device 600 shown in FIG. 8.
  • the walls 2a of the enclosure 2 of this device 600 are formed by two ceramic plates 30 separated by the distance D. These plates 30 have grooves 31 in which electrical heating resistors 32 are arranged in contact with the plates 30.
  • each plate 30 has a groove in which a resistor 32 is arranged, this resistor having the shape of a coil , as shown in Figure 9 which is a top view of a plate 30 with its resistor 32.
  • This device 600 is used to heat the strip 1 or to prevent its cooling.
  • All the strips treated are by way of example in the form of flat plates, that is to say that they have a section perpendicular to the longitudinal direction which has a rectangular shape.
  • This example concerns the treatment of carbon steel with a martensitic structure, in accordance with patent FR 2 311 854.
  • a strip of thickness E 100 "m and width L is used 300 mm obtained by cold rolling a strip 2 mm thick, the steel of which has the following composition: C: 0.085%; Mn: 0.3%; If: 0.05%; S: 0.024%; P: 0.024%; Cu: 0.056%; Cr: 0.05%; Ni: 0.025%; N: 0.003%; Total O: 0.0145%.
  • Strip running speed 1 m / s.
  • This example concerns the heating of a steel strip before galvanization by dipping in a bath of molten zinc.
  • This preheating is carried out with a device 600 whose power nominal heating is 1300 kW.
  • Strip running speed 0.2 m / s.
  • Strip residence time 3.25 s.
  • K T 3.81.
  • Preferably, for preheating before galvanizing we have: 1 ⁇ K T ⁇ 10.
  • This example describes a pearlitization treatment of a steel strip with a heating phase and two cooling phases.
  • composition of the steel used is as follows: C: 0.80%; Mn: 0.69%; If: 0.21%; S: 0.025%; P: 0.018%; Al: 0.081%; Ca: 0.044%; Cr: 0.059%; Ni: 0.015%.
  • the invention is not limited to the embodiments previously described.
  • the invention covers the case where several strips are treated simultaneously.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Articles (AREA)

Claims (12)

  1. Verfahren zur Wärmebehandlung wenigstens eines Metallbandes mit der Form einer im wesentlichen ebenen Platte oder eines Profils, gemäß dem man das Band in ein Gehäuse eintreten läßt, dessen Wände parallel zu den Oberflächen des Bandes sind und das ein von erzwungener Ventilation praktisch freies Gas derart enthält, daß ein Wärmeübergang zwischen dem Band und den Wänden des Gehäuses mittels des im Gehäuse enthaltenen Gases erfolgt, und gemäß dem der Koeffizient KT durch die Beziehungen definiert wird:

    K T = (J/C) x E²; 0,01 ≦ K T ≦ 100,
    Figure imgb0008

    wobei J die in mm ausgedrückte Dicke der Gasschicht zwischen dem Band und dem Gehäuse ist,
    E die in mm ausgedrückte Dicke des Bandes ist, und
    C die bei 600 °C bestimmte und in W.m⁻¹.°K⁻¹ ausgedrückte Wärmeleitfähigkeit ist.
  2. Verfahren nach dem Anspruch 1,
    dadurch gekennzeichnet,
    daß man die Beziehung 0,2 mm ≦ J ≦ 2 mm hat.
  3. Verfahren nach einem der Ansprüche 1 oder 2,
    dadurch gekennzeichnet,
    daß man eine Stahlbandbehandlung vornimmt.
  4. Verfahren nach dem Anspruch 3,
    dadurch gekennzeichnet,
    daß man ein Stahlband mit zwei Phasen, Ferrit und Bainit, mit der Beziehung 4 ≦ KT ≦ 100 herstellt.
  5. Verfahren nach dem Anspruch 3,
    dadurch gekennzeichnet,
    daß man ein Band martensitischen Gefüges mit der Beziehung 0,01 ≦ KT ≦ 0,1 behandelt.
  6. Verfahren nach dem Anspruch 5,
    dadurch gekennzeichnet,
    daß man eine Zementierungsbehandlung zum Erhalten von 0,4 bis 0,9 % Kohlenstoff vornimmt.
  7. Verfahren nach dem Anspruch 3,
    dadurch gekennzeichnet,
    daß man vor Durchführung einer Verzinkungsbehandlung des Bandes eine Vorerhitzung mit der Beziehung 1 ≦ KT ≦ 10 vornimmt.
  8. Verfahren nach dem Anspruch 3,
    dadurch gekennzeichnet,
    daß man eine Perlitisierungsbehandlung mit 1 ≦ KT ≦ 8 vornimmt.
  9. Vorrichtung zur Wärmebehandlung wenigstens eines Metallbandes mit der Form einer im wesentlichen ebenen Platte oder eines Profils, welche Vorrichtung die folgenden Merkmale aufweist:
    a) sie weist wenigstens ein Gehäuse, das ein von erzwungener Ventilation praktisch freies Gas enthält, und Mittel auf, die ermöglichen, wenigstens ein Band in das Gehäuse eintreten zu lassen;
    b) die Vorrichtung wird betrieben, so daß ein Wärmeübergang zwischen dem Band und den Wänden des Gehäuses mittels des im Gehäuse enthaltenen Gases erfolgt, wobei der Koeffizient KT durch die Beziehungen definiert wird:

    K T = (J/C) x E²; 0,01 ≦ K T ≦ 100,
    Figure imgb0009

    wobei J die in mm ausgedrückte Dicke der Gasschicht zwischen dem Band und dem Gehäuse ist,
    E die in mm ausgedrückte Dicke des Bandes ist, und
    C die bei 600 °C bestimmte und in W.m⁻¹.°K⁻¹ ausgedruckte Wärmeleitfähigkeit ist;
    c) die Vorrichtung weist Mittel auf, die es ermöglichen, J variieren zu lassen.
  10. Vorrichtung nach dem Anspruch 9,
    dadurch gekennzeichnet
    daß man 0,2 mm ≦ J ≦ 2 mm hat.
  11. Vorrichtung nach irgendeinem der Ansprüche 9 oder 10, dadurch gekennzeichnet,
    daß sie wenigstens einen elektrischen Widerstand im Kontakt mit einer Wand des Gehäuses aufweist.
  12. Vorrichtung nach irgendeinem der Ansprüche 9 bis 11, dadurch gekennzeichnet,
    daß sie Mittel aufweist, die ermöglichen, ein Wärmeübertragungsfluid an der Außenseite des Gehäuses zirkulieren zu lassen.
EP90113801A 1989-07-26 1990-07-19 Verfahren und Vorrichtung zur Wärmebehandlung von Metallband Expired - Lifetime EP0410294B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8910323A FR2650295B1 (fr) 1989-07-26 1989-07-26 Procede et dispositif permettant de traiter thermiquement des feuillards metalliques
FR8910323 1989-07-26

Publications (2)

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EP0410294A1 EP0410294A1 (de) 1991-01-30
EP0410294B1 true EP0410294B1 (de) 1995-03-01

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US (1) US5089059A (de)
EP (1) EP0410294B1 (de)
JP (1) JPH0361331A (de)
AT (1) ATE119211T1 (de)
CA (1) CA2022042A1 (de)
DE (1) DE69017296T2 (de)
ES (1) ES2069637T3 (de)
FR (1) FR2650295B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6355364B1 (en) 1999-06-29 2002-03-12 International Business Machines Corporation Process of heat treating and annealing CIC and CIC created thereby
US20050123740A1 (en) * 2000-03-22 2005-06-09 Hume James M. Liner for waste water system rehabilitation
JP5629992B2 (ja) * 2009-08-08 2014-11-26 大同特殊鋼株式会社 金属ストリップの横型連続焼鈍炉

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075136B (de) * 1960-02-11 Vacuumschmelze Aktiengesellschaft, Hanau Durchlaufofen fur Tempera türen über 10000C zum Glühen von Werkstoffen in sehr reiner Schutzgasatmosphäre
FR326005A (fr) * 1902-10-18 1903-05-14 Reid John Keith Perfectionnements dans les systèmes de signaux
US1944743A (en) * 1930-06-26 1934-01-23 Gen Electric Method for annealing steel
DE1811121A1 (de) * 1968-11-27 1970-06-11 Willi Vongehr Ofen zum Blankgluehen von Draehten oder feinen Metallgeweben und Metalltuechern
DE2111631A1 (de) * 1970-03-13 1972-03-30 Pirelli Vorrichtung zum Haerten von Stahldraht
US3950192A (en) * 1974-10-30 1976-04-13 Monsanto Company Continuous carburizing method
FR2311854A1 (fr) * 1975-05-21 1976-12-17 Michelin & Cie Toles d'acier et objets en tole d'acier a proprietes ameliorees et leur procede de fabrication
FR2626290B1 (fr) * 1988-01-25 1990-06-01 Michelin & Cie Procedes et dispositifs permettant de traiter thermiquement des fils d'acier au carbone de facon a obtenir une structure perlitique fine

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Publication number Publication date
FR2650295B1 (fr) 1994-04-01
FR2650295A1 (fr) 1991-02-01
US5089059A (en) 1992-02-18
ATE119211T1 (de) 1995-03-15
CA2022042A1 (fr) 1991-01-27
JPH0361331A (ja) 1991-03-18
DE69017296D1 (de) 1995-04-06
DE69017296T2 (de) 1995-06-29
EP0410294A1 (de) 1991-01-30
ES2069637T3 (es) 1995-05-16

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