EP0897017A1 - Tower furnace for heat treatment of metal strips - Google Patents

Tower furnace for heat treatment of metal strips Download PDF

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Publication number
EP0897017A1
EP0897017A1 EP98890147A EP98890147A EP0897017A1 EP 0897017 A1 EP0897017 A1 EP 0897017A1 EP 98890147 A EP98890147 A EP 98890147A EP 98890147 A EP98890147 A EP 98890147A EP 0897017 A1 EP0897017 A1 EP 0897017A1
Authority
EP
European Patent Office
Prior art keywords
muffle
heat treatment
furnace
metal strips
tower furnace
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.)
Granted
Application number
EP98890147A
Other languages
German (de)
French (fr)
Other versions
EP0897017B1 (en
Inventor
Peter Helmut Dipl.-Ing. Ebner
Heribert Dipl.-Ing. Lochner
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.)
Ebner Peter Helmut Dipl-Ing
Lochner Heribert Dipl-Ing
Original Assignee
Ebner Peter Helmut Dipl-Ing
Lochner Heribert Dipl-Ing
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 Ebner Peter Helmut Dipl-Ing, Lochner Heribert Dipl-Ing filed Critical Ebner Peter Helmut Dipl-Ing
Publication of EP0897017A1 publication Critical patent/EP0897017A1/en
Application granted granted Critical
Publication of EP0897017B1 publication Critical patent/EP0897017B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C21D9/0043—Muffle furnaces; Retort furnaces
    • 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
    • C21D9/66—Tower-type furnaces

Definitions

  • the invention relates to a tower furnace for the heat treatment of metal strips with the belt running through the entire furnace height Muffle.
  • Metal strips in particular made of Cr-Ni steel or Cr steel, have hitherto been continuously bright annealed in so-called door furnaces, the heat treatment taking place under a protective gas consisting of H 2 or H 2 / N 2 mixture.
  • the strip is heated by radiation in a muffle heated on the outside and then cooled in a cooling system. Both gas burners and electrical resistance heating elements can be used to heat the muffle.
  • the oven temperature is determined by the material used Limited muffle.
  • the strip heating is therefore from the muffle counter temperature dependent and runs according to one of the emission factors of the band and the muffle certain function.
  • the muffle length results from the tear length of the used Material, d. H. that the dead weight of the muffle leads to their destruction can.
  • the invention has for its object a tower furnace of the aforementioned To create the way in which the desired strip end temperature is reached without the Exceeding the tear length of the muffle and without the band heating due to colder Delay oven parts.
  • the invention solves this problem in that an insulated plug with electrical Heating is inserted into the top of the muffle, whereas one is preferably under the plug gas-heated preheating room.
  • the furnace can be brightly glowed even after a long interruption in production with a normal addition of H 2 .
  • the energy losses are negligible due to the slightly lower temperature of the muffle outer wall in the plug area.
  • this lowering of the temperature there is at the same time an increase in the strength of the material, which in turn allows the muffle to be lengthened, with no risk that the tear length of the muffle will be exceeded.
  • the drawing shows an exemplary embodiment of a tower furnace schematically in longitudinal section.

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)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Tunnel Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)

Abstract

The tower furnace for heat treatment of metal strips (6) incorporates a muffle (3) which extends over the entire furnace height. An isolated plug (1) with an electric heating element (2) is inserted into the top section of the muffle, while below the plug there is a preferably gas heated preliminary heating space (4) for the strip.

Description

Die Erfindung bezieht sich auf einen Turmofen zur Wärmebehandlung von Metallbändern mit sich über die ganze Ofenhöhe erstreckender, vom Band durchlaufener Muffel.The invention relates to a tower furnace for the heat treatment of metal strips with the belt running through the entire furnace height Muffle.

Metallbänder, insbesondere aus Cr-Ni-Stahl bzw. Cr-Stahl, werden bisher in sogenannten Turmöfen kontinuierlich blankgeglüht, wobei die Wärmebehandlung unter Schutzgas, bestehend aus H2 bzw. H2/N2-Gemisch erfolgt. Das Band wird in einer auf der Außenseite beheizten Glühmuffel durch Strahlung erwärmt und nachfolgend in einem Kühlsystem abgekühlt. Zur Beheizung der Muffel können sowohl Gasbrenner als auch elektrische Widerstandsheizelemente herangezogen werden.Metal strips, in particular made of Cr-Ni steel or Cr steel, have hitherto been continuously bright annealed in so-called door furnaces, the heat treatment taking place under a protective gas consisting of H 2 or H 2 / N 2 mixture. The strip is heated by radiation in a muffle heated on the outside and then cooled in a cooling system. Both gas burners and electrical resistance heating elements can be used to heat the muffle.

Es ist auch eine Erwärmung des Bandes in einem elektrisch beheizten Ofen ohne Muffel bekannt. Dabei besteht aber der Nachteil, daß sich bis zum Erreichen einer einwandfrei blankgeglühten Bandoberfläche bei Produktionsunterbrechungen eine lange Spülzeit mit hohem Wasserstoffverbrauch während des Spül- und Produktionsbetriebes ergibt.There is also heating of the belt in an electrically heated oven without Muffle known. However, there is the disadvantage that until a perfectly bright annealed strip surface during production interruptions a long Flushing time with high hydrogen consumption during flushing and production operations results.

Um einen möglichst hohen Materialdurchsatz zu erreichen, wird mit maximal möglicher Ofentemperatur geglüht. Die Ofentemperatur ist jedoch durch den Werkstoff der eingesetzten Muffel begrenzt. Die Banderwärmung ist also von der Muffelgegentemperatur abhängig und verläuft nach einer von den Emissionsfaktoren des Bandes und der Muffel bestimmten Funktion. Die Muffellänge ergibt sich aus der Reißlänge des verwendeten Werkstoffes, d. h. daß das Eigengewicht der Muffel zu deren Zerstörung führen kann.In order to achieve the highest possible material throughput, the maximum possible Oven temperature annealed. However, the oven temperature is determined by the material used Limited muffle. The strip heating is therefore from the muffle counter temperature dependent and runs according to one of the emission factors of the band and the muffle certain function. The muffle length results from the tear length of the used Material, d. H. that the dead weight of the muffle leads to their destruction can.

Um die Bandtemperatur in die Nähe der Muffel-Maximaltemperatur zu bringen, ist es bekannt, den Ofen geteilt auszuführen. Dabei wird in einem unteren, mit einer Glühmuffel versehenen meist gasbeheizten Ofen das Band vorgewärmt und durchläuft dann einen darüber angeordneten muffellosen elektrisch beheizten Ofen, der mit höheren Temperaturen gefahren werden kann. Da ein Teil des Ofens muffellos ausgeführt ist, ergibt sich wieder eine verlängerte Spülzeit. Durch den H2-Betrieb sind höhere Energieverluste der Außenwand des Ofens gegeben. Gegenüber Luft- oder Rauchgasen wird der Wärmedurchgang in den Isolierkörpern, z. B. Mauerung oder keramische Wolle, durch H2 deutlich erhöht. Da zwei übereinander angeordnete Öfen vorgesehen sind, ergibt sich an den Flanschstellen der beiden Öfen eine Verminderung der Erwärmungsleistung des Gesamtofens, abgesehen von den erhöhten Baukosten.In order to bring the strip temperature close to the maximum muffle temperature, it is known to make the furnace divided. The strip is preheated in a lower, usually gas-heated, furnace provided with a glow muffle and then passes through a muffle-free, electrically heated furnace arranged above it, which can be operated at higher temperatures. Since part of the oven is designed to be flawless, there is an extended rinsing time. H 2 operation results in higher energy losses on the outer wall of the furnace. Compared to air or smoke gases, the heat transfer in the insulating bodies, for. B. masonry or ceramic wool, significantly increased by H 2 . Since two stoves arranged one above the other are provided, there is a reduction in the heating performance of the entire stove at the flange points of the two stoves, apart from the increased construction costs.

Der Erfindung liegt die Aufgabe zugrunde, einen Turmofen der eingangs geschilderten Art zu schaffen, bei dem die gewünschte Bandendtemperatur erreicht wird, ohne die Reißlänge der Muffel zu überschreiten und ohne die Banderwärmung durch kältere Ofenteile zu verzögern.The invention has for its object a tower furnace of the aforementioned To create the way in which the desired strip end temperature is reached without the Exceeding the tear length of the muffle and without the band heating due to colder Delay oven parts.

Die Erfindung löst diese Aufgabe dadurch, daß ein isolierter Stopfen mit elektrischer Heizung oben in die Muffel eingesetzt ist, wogegen sich unter dem Stopfen ein vorzugsweise gasbeheizter Vorwärmraum befindet.The invention solves this problem in that an insulated plug with electrical Heating is inserted into the top of the muffle, whereas one is preferably under the plug gas-heated preheating room.

Da der isolierte Stopfen in seinem Volumen wesentlich kleiner als ein muffelloser Ofen ist, ergibt sich auch nach längerer Produktionsunterbrechung bereits kurzfristig bei normaler Zugabemenge von H2 die Blankglühfähigkeit des Ofens. Die Energieverluste sind auf Grund der im Stopfenbereich geringfügig abgesenkten Temperatur der Muffelaußenwand vernachlässigbar. Durch diese Temperaturabsenkung ist aber gleichzeitig eine Festigkeitserhöhung des Materials gegeben, die wiederum eine Verlängerung der Muffel erlaubt, wobei keine Gefahr besteht, daß die Reißlänge der Muffel überschritten wird. Since the volume of the insulated stopper is significantly smaller than that of a muffle-free furnace, the furnace can be brightly glowed even after a long interruption in production with a normal addition of H 2 . The energy losses are negligible due to the slightly lower temperature of the muffle outer wall in the plug area. As a result of this lowering of the temperature, there is at the same time an increase in the strength of the material, which in turn allows the muffle to be lengthened, with no risk that the tear length of the muffle will be exceeded.

Die Zeichnung zeigt als Ausführungsbeispiel einen Turmofen schematisch im Längsschnitt.The drawing shows an exemplary embodiment of a tower furnace schematically in longitudinal section.

We ersichtlich, ist ein isdierter Stopfen 1 mit elektrischer Heizung 2 oben in die sich über die ganze Ofenhöhe erstreckende Muffel 3 eingesetzt. Unter den Stopfen 1 befindet sich ein Vorwärmraum 4, wobei dort die Muffel von außen durch den Freiraum 4a gasbeheizt ist Mit 5 ist die Außenisolation bezeichnet. Wie ersichtlich, durchläuft das zur Wärmebehandlung vorgesehene Band 6 die ganze Ofenlänge.As can be seen, there is an isolated plug 1 with electrical heating 2 at the top Muffle 3 extending over the entire furnace height is used. Located under the stopper 1 a preheating room 4, where the muffle from the outside through the free space 4a 5 is the external insulation. As can be seen, this goes through Belt 6 provided for heat treatment the entire length of the furnace.

Claims (1)

Turmofen zur Wärmebehandlung von Metallbändern mit sich über die ganze Ofenhöhe erstreckender, vom Band (6) durchlaufener Muffel (3), dadurch gekennzeichnet, daß ein isolierter Stopfen (1) mit elektrischer Heizung (2) oben in die Muffel (3) eingesetzt ist, wogegen sich unter dem Stopfen (1) ein vorzugsweise gasbeheizter Vorwärmraum (4) befindet.Tower furnace for the heat treatment of metal strips with itself over the whole Muffle (3) extending from the belt (6), characterized by that an insulated plug (1) with electrical heating (2) at the top in the muffle (3) is used, whereas there is a preferably gas-heated one under the stopper (1) Preheating room (4) is located.
EP98890147A 1997-06-10 1998-05-20 Tower furnace for heat treatment of metal strips Expired - Lifetime EP0897017B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT99997 1997-06-10
AT999/97 1997-06-10
AT0099997A AT405055B (en) 1997-06-10 1997-06-10 TOWER STOVES FOR THE HEAT TREATMENT OF METAL STRIPS

Publications (2)

Publication Number Publication Date
EP0897017A1 true EP0897017A1 (en) 1999-02-17
EP0897017B1 EP0897017B1 (en) 2001-10-31

Family

ID=3504621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98890147A Expired - Lifetime EP0897017B1 (en) 1997-06-10 1998-05-20 Tower furnace for heat treatment of metal strips

Country Status (8)

Country Link
US (1) US6031206A (en)
EP (1) EP0897017B1 (en)
JP (1) JP4077930B2 (en)
KR (1) KR19990006771A (en)
AT (2) AT405055B (en)
DE (1) DE59801932D1 (en)
ES (1) ES2167060T3 (en)
TW (1) TW410239B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167554A2 (en) * 2000-06-29 2002-01-02 Peter Helmut Dipl.-Ing. Ebner Tower-type furnace for heat treating of metal strip

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT507670B1 (en) * 2009-07-03 2010-07-15 Ebner Ind Ofenbau TOWER FOR THE HEAT TREATMENT OF A METAL STRIP
JP5550924B2 (en) * 2010-01-26 2014-07-16 光洋サーモシステム株式会社 Continuously heated muffle furnace

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE652552C (en) * 1937-11-02 Siemens Schuckertwerke Akt Ges Tower furnace with a gas-tight inner jacket surrounding the drawn-through material
US2104886A (en) * 1934-04-30 1938-01-11 Firm Heraeus Vacuumschmelze Ag Electrically heated annealing furnace
FR836893A (en) * 1937-04-20 1939-01-27 Roechlingsche Eisen & Stahl White annealing furnace
EP0675208A1 (en) * 1994-03-31 1995-10-04 Chugai Ro Co., Ltd. A vertical bright annealing furnace for continuous heat treatment of metal strips
WO1997039154A1 (en) * 1996-04-12 1997-10-23 Thermtec B.V. Vertical annealing furnace for a strip treatment device

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US3823003A (en) * 1970-04-14 1974-07-09 Dow Chemical Co Preparation of metals
US4299565A (en) * 1977-07-25 1981-11-10 Kawasaki Steel Corporation Heating furnace
US4229163A (en) * 1977-07-25 1980-10-21 Kawasaki Steel Corporation Heating furnace
JPS5811493B2 (en) * 1978-12-29 1983-03-03 新日本製鐵株式会社 Continuous annealing equipment for cold rolled steel strip
EP0181830B1 (en) * 1984-11-08 1991-06-12 Mitsubishi Jukogyo Kabushiki Kaisha Method and apparatus for heating a strip of metallic material in a continuous annealing furnace
JPS61157641A (en) * 1984-12-28 1986-07-17 Chugai Ro Kogyo Kaisha Ltd Continuous annealing furnace for metallic strip
EP0233944B1 (en) * 1985-07-18 1991-03-06 Nippon Kokan Kabushiki Kaisha Continuous strip steel processing line having direct firing furnace
US5609785A (en) * 1992-10-05 1997-03-11 Acon Finland Oy Ltd. Method and apparatus for improving the performance of a heating furnace for metal slabs
JP2815086B2 (en) * 1994-02-21 1998-10-27 住友金属工業株式会社 Vertical continuous annealing furnace for steel strip
JPH08260059A (en) * 1995-03-17 1996-10-08 Nippon Steel Corp Continuous annealing furnace excellent in atmosphere control ability

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE652552C (en) * 1937-11-02 Siemens Schuckertwerke Akt Ges Tower furnace with a gas-tight inner jacket surrounding the drawn-through material
US2104886A (en) * 1934-04-30 1938-01-11 Firm Heraeus Vacuumschmelze Ag Electrically heated annealing furnace
FR836893A (en) * 1937-04-20 1939-01-27 Roechlingsche Eisen & Stahl White annealing furnace
EP0675208A1 (en) * 1994-03-31 1995-10-04 Chugai Ro Co., Ltd. A vertical bright annealing furnace for continuous heat treatment of metal strips
WO1997039154A1 (en) * 1996-04-12 1997-10-23 Thermtec B.V. Vertical annealing furnace for a strip treatment device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HANS WERNER HONERVOGT: "Eine indirekt beheizte Glühanlage für das Glühen von nichtrostenden und säurebeständigen Kaltbändern unter Schutzgas", STAHL UND EISEN, vol. 93, no. 24, 22 November 1973 (1973-11-22), Düsseldorf, DE, pages 1152 - 1157, XP002021733 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1167554A2 (en) * 2000-06-29 2002-01-02 Peter Helmut Dipl.-Ing. Ebner Tower-type furnace for heat treating of metal strip
EP1167554A3 (en) * 2000-06-29 2004-01-02 Peter Helmut Dipl.-Ing. Ebner Tower-type furnace for heat treating of metal strip

Also Published As

Publication number Publication date
JPH1150156A (en) 1999-02-23
ATE207973T1 (en) 2001-11-15
US6031206A (en) 2000-02-29
EP0897017B1 (en) 2001-10-31
ES2167060T3 (en) 2002-05-01
ATA99997A (en) 1998-09-15
DE59801932D1 (en) 2001-12-06
JP4077930B2 (en) 2008-04-23
TW410239B (en) 2000-11-01
KR19990006771A (en) 1999-01-25
AT405055B (en) 1999-05-25

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