EP0195739A2 - Semicontinuous annealing process - Google Patents

Semicontinuous annealing process Download PDF

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Publication number
EP0195739A2
EP0195739A2 EP86730028A EP86730028A EP0195739A2 EP 0195739 A2 EP0195739 A2 EP 0195739A2 EP 86730028 A EP86730028 A EP 86730028A EP 86730028 A EP86730028 A EP 86730028A EP 0195739 A2 EP0195739 A2 EP 0195739A2
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EP
European Patent Office
Prior art keywords
strip
bundle
annealing
aging
store
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Granted
Application number
EP86730028A
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German (de)
French (fr)
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EP0195739A3 (en
EP0195739B1 (en
Inventor
Klaus Dr.-Ing. Fromman
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Vodafone GmbH
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Mannesmann AG
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Publication of EP0195739A3 publication Critical patent/EP0195739A3/en
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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
    • 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

Definitions

  • the invention relates to an annealing system for cold-rolled steel strip.
  • Cold-rolled steel strip must be annealed after cold rolling in order to be used for further processing, e.g. B. by deep drawing to achieve the required mechanical properties.
  • the annealing of cold rolled steel strip is done e.g. Currently still largely in bell annealers. This process is very lengthy, with annealing and cooling times of up to 10 days being common.
  • An advantage of the hood annealing is that even small production quantities can be produced economically and that the investment costs for a plant of low production are relatively low.
  • a major disadvantage of the bell annealer is that high-strength steels, especially the so-called dual-phase steels, can only be produced to a very limited extent and with the use of additional alloying elements, which makes these steels correspondingly expensive.
  • the disadvantages of bell annealing are largely eliminated by the continuous annealing. This enables cost-effective production of high-strength steels, better uniformity of the material properties over the length of the strip, better cleanliness of the strip surface and excellent flatness of the strip. In addition, the throughput time of the material is drastically reduced compared to the hood anneal and is only about 10 minutes.
  • the disadvantage of continuous annealing is that, in their current design, they require very high investment costs and are therefore only economically interesting for relatively high annual production.
  • the object of the invention is to provide an annealing system with which even smaller production quantities can be processed economically in a process corresponding to continuous annealing. According to the invention, this object is achieved by the features specified in the patent claims.
  • a semi-continuous annealing installation is created in a favorable manner, in which an otherwise usual separate over-aging furnace is achieved by passing through the installation twice and operating the annealing furnace as an aging furnace is saved. This considerably reduces the system outlay; the overall length is greatly reduced.
  • the pickling which must be arranged in front of the annealing furnace or aging furnace in this system, is bypassed the first time the belt is run through.
  • the cold-rolled strip first goes through the known strip cleaning process steps (degreasing 5, rinsing 7, drying 8). Then it runs into a vertical annealing furnace 10; where it is heated to annealing temperature, mainly inductively 11, and briefly held to annealing temperature 12 (under protective gas). The strip is then slowly cooled 13 from the holding temperature between 700 ° C and 850 ° C to a lower temperature with cooled protective gas and quenched very quickly in a known manner after exiting the furnace in a water tank 14, the quenching speed depending on the strip thickness being approx Can be 500 to 2000 ° C per second. Depending on the steel grade, quenching in the water tank can also take place directly from the holding temperature.
  • the belt surface After exiting the furnace, the belt surface is oxidized.
  • the tape which is moist after exiting the water tank, is then dried 15 and wound up into a bundle by a reel 18.
  • a tape store and a pair of scissors 17 are arranged in front of the reel.
  • the bundles annealed and quenched in this way still contain a high proportion of carbon dissolved in iron and are therefore not yet suitable for further processing. Besides, that is Surface covered by a thin layer of oxide.
  • a second pass of the strip through the plant according to FIG. 2 then follows, wherein pickling and aging are carried out in order to remove the oxide layer and to partially or completely remove the dissolved carbon. For this purpose, after a sufficiently large number of bundles have passed through the first treatment stage, these bundles are returned to the decoilers after passing through an intermediate store 19.
  • the first band is welded to a dummy band (at 3), which has been welded to the last band of the first pass.
  • the strip passes through the pickle 6, neutralization 7, sink 8 and dryer 9 before it enters the oven 10 again.
  • the strip is preferably inductively heated under protective gas to the aging temperature which, depending on the steel grade, is 200 ° C. to 400 ° C.
  • the strip is held at this temperature in a known manner for about 45 to 60 seconds, the carbon dissolved in the iron being partially or almost completely eliminated, depending on the temperature.
  • the strip is cooled to a temperature below 100 ° C. by means of cooled protective gas, so that it no longer oxidizes when it leaves the furnace.
  • the tape is then fed through the dry water tank to the take-up reel 18 and wound into bundles.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

Die Erfindung betrifft ein Verfahren zum Glühen von kaltgewalztem Stahlband, bei dem das Band von Ablaufhaspeln abgewickelt und nacheinander durch verschiedene Behandlungsstationen hindurchgeführt wird. Die Erfindung ist dadurch gekennzeichnet, daß insbesondere bei der Verarbeitung kleinerer Bandmengen das Band nach dem Verlassen der Wasserabschreckvorrichtung (14) nach Durchlaufen der Trockenvorrichtung (15) und des Bandspeichers (16) zu einem Bund aufgehaspelt und als Bund einem Zwischenlager (19) zugeführt wird und daß das Bund vom Zwischenlager (19) kommend erneut dem Ablaufhaspel (1) zugeführt wird, um ein zweites Mal durch die jetzt als Überalterungslinie betriebene Glühlinie (10 bis 13) geführt zu werden, wobei das Band in bekannter Weise zunächst gebeizt (6), neutralisiert (7), gespült (8), getrocknet (9) und im Glühofen (10) bei geeigneter Temperatur in üblicher Weise überaltert (12) und anschließend aufgehaspelt (18) wird.The invention relates to a method for annealing cold-rolled steel strip, in which the strip is unwound from decoilers and passed through different treatment stations one after the other. The invention is characterized in that, in particular when processing smaller amounts of strip, the strip is wound into a bundle after leaving the water quenching device (14) after passing through the drying device (15) and the band store (16) and fed to an intermediate store (19) as a bundle and that the bundle coming from the intermediate store (19) is fed again to the decoiler (1) in order to be guided a second time through the annealing line (10 to 13) now operated as an aging line, the strip first being pickled in a known manner (6) , neutralized (7), rinsed (8), dried (9) and in the annealing furnace (10) at a suitable temperature in the usual way over-aged (12) and then coiled (18).

Description

Die Erfindung betrifft eine Glühanlage für kaltgewalztes Stahlband.The invention relates to an annealing system for cold-rolled steel strip.

Kaltgewalztes Stahlband muß nach dem Kaltwalzen geglüht werden, um die für eine Weiterverarbeitung, z. B. durch Tiefziehen, erforderlichen mechanischen Eigenschaften zu erzielen. Das Glühen von kaltgewalztem Stahlband erfolgt z. Zt. noch im überwiegenden Maße in Haubenglühanlagen. Dieser Vorgang ist sehr langwierig, wobei Glüh- und Abkühlzeiten von bis zu 10 Tagen üblich sind. Ein Vorteil der Haubenglühen besteht darin, daß auch kleine Produktionsmengen wirtschaftlich hergestellt werden können und daß die Investitionskosten für eine Anlage geringer Produktion relativ niedrig sind. Ein großer Nachteil der Haubenglühe ist, daß damit hochfeste Stähle, besonders die sogenannten Dual-Phase-Stähle nur in sehr geschränktem Umfang und unter Verwendung zusätzlicher Legierungselemente, hergestellt werden können, wodurch diese Stähle entsprechend teuer werden.Cold-rolled steel strip must be annealed after cold rolling in order to be used for further processing, e.g. B. by deep drawing to achieve the required mechanical properties. The annealing of cold rolled steel strip is done e.g. Currently still largely in bell annealers. This process is very lengthy, with annealing and cooling times of up to 10 days being common. An advantage of the hood annealing is that even small production quantities can be produced economically and that the investment costs for a plant of low production are relatively low. A major disadvantage of the bell annealer is that high-strength steels, especially the so-called dual-phase steels, can only be produced to a very limited extent and with the use of additional alloying elements, which makes these steels correspondingly expensive.

Die Nachteile der Haubenglühe werden weitgehend durch die Durchlaufglühe behoben. Diese ermöglicht es, eine kostengünstige Herstellung hochfester Stähle, bessere Gleichmäßigkeit der Materialeigenschaften über die Bandlänge, bessere Sauberkeit der Bandoberfläche und hervorragende Planheit des Bandes zu erzielen. Außerdem wird die Durchlaufzeit des Materials im Vergleich zur Haubenglühe drastisch verringert und beträgt nur noch ca. 10 Minuten. Nachteil der Durchlaufglühen ist, daß diese in ihrer derzeitigen Konzeption sehr hohe Investitionskosten erfordern und deshalb nur für relativ hohe Jahresproduktionen wirtschaftlich interessant sind.The disadvantages of bell annealing are largely eliminated by the continuous annealing. This enables cost-effective production of high-strength steels, better uniformity of the material properties over the length of the strip, better cleanliness of the strip surface and excellent flatness of the strip. In addition, the throughput time of the material is drastically reduced compared to the hood anneal and is only about 10 minutes. The disadvantage of continuous annealing is that, in their current design, they require very high investment costs and are therefore only economically interesting for relatively high annual production.

Aufgabe der Erfindung ist es, eine Glühanlage zu schaffen, mit der auch geringere Produktionsmengen wirtschaftlich in einem dem kontinuierlichen Glühen entsprechenden Verfahren verarbeitet werden können. Gelöst wird diese Aufgabe erfindungsgemäß durch die in den Patentansprüchen angegebenen Merkmale. Durch die Erfindung wird in günstiger Weise eine halbkontinuierliche Glühanlage geschaffen, bei der durch zweimaligen Durchlauf durch die Anlage und Betreiben des Glühofens als Uberalterungsofen ein sonst üblicher separater Uberalterungsofen eingespart wird. Dadurch reduziert sich der Anlagenaufwand erheblich; die Bau-länge wird stark reduziert. Die Beize, die bei dieser Anlage vor dem Glühofen bzw. Uberalterungsofen angeordnet sein muß, wird beim ersten Durchlauf des Bandes umfahren.The object of the invention is to provide an annealing system with which even smaller production quantities can be processed economically in a process corresponding to continuous annealing. According to the invention, this object is achieved by the features specified in the patent claims. By means of the invention, a semi-continuous annealing installation is created in a favorable manner, in which an otherwise usual separate over-aging furnace is achieved by passing through the installation twice and operating the annealing furnace as an aging furnace is saved. This considerably reduces the system outlay; the overall length is greatly reduced. The pickling, which must be arranged in front of the annealing furnace or aging furnace in this system, is bypassed the first time the belt is run through.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird nachfolgend beschrieben. Es zeigt:

  • Fig. 1 die erfindungsgemäße Glühanlage während des Glühbetriebes,
  • Fig. 2 die erfindungsgemäße Glühanlage während des Überalterungsbetriebes.
An embodiment of the invention is shown in the drawing and is described below. It shows:
  • 1 shows the glow system according to the invention during glow operation,
  • Fig. 2 shows the glow system according to the invention during the aging operation.

Das kaltgewalzte Band durchläuft zunächst die bekannte Verfahrensstufen Bandreinigung (Entfetten 5, Spülen 7, Trocknen 8). Danach läuft es in einen vertikalen Glühofen 10; wo es auf Glühtemperatur, vornehmlich induktiv aufgeheizt 11, und auf Glühtemperatur kurzzeitig gehalten 12, wird (unter Schutzgas). Danach wird das Band mit gekühltem Schutzgas von der zwischen 700°C und 850°C liegenden Haltetemperatur auf eine niedrigere Temperatur langsam abgekühlt 13 und in bekannter Weise nach Austritt aus dem Ofen in einem Wassertank 14 sehr schnell abgeschreckt, wobei die Abschreckungsgeschwindigkeit je nach Banddicke ca. 500 bis 2000°C pro Sekunde betragen kann. Das Abschrecken im Wassertank kann je nach Stahlgüte auch direkt von der Haltetemperatur erfolgen. Nach Austritt aus dem ofen erfolgt eine Oxidation der Bandoberfläche. Das nach Austritt aus dem Wassertank feuchte Band-wird danach getrocknet 15 und durch einen Haspel 18 zu einem Bund aufgewickelt. In bekannter Weise sind dem Haspel ein Bandspeicher und eine Schere 17 vorgeordnet.The cold-rolled strip first goes through the known strip cleaning process steps (degreasing 5, rinsing 7, drying 8). Then it runs into a vertical annealing furnace 10; where it is heated to annealing temperature, mainly inductively 11, and briefly held to annealing temperature 12 (under protective gas). The strip is then slowly cooled 13 from the holding temperature between 700 ° C and 850 ° C to a lower temperature with cooled protective gas and quenched very quickly in a known manner after exiting the furnace in a water tank 14, the quenching speed depending on the strip thickness being approx Can be 500 to 2000 ° C per second. Depending on the steel grade, quenching in the water tank can also take place directly from the holding temperature. After exiting the furnace, the belt surface is oxidized. The tape, which is moist after exiting the water tank, is then dried 15 and wound up into a bundle by a reel 18. In a known manner, a tape store and a pair of scissors 17 are arranged in front of the reel.

Die auf diese Art geglühten und abgeschreckten Bunde enthalten noch einen hohen Anteil an in Eisen gelöstem Kohlenstoff und sind deshalb für eine Weiterverarbeitung noch nicht geeignet. Außerdem ist die Oberfläche von einer dünnen Oxidschicht bedeckt. Es folgt deshalb ein zweiter Durchlauf des Bandes durch die Anlage gemäß Fig. 2, wobei ein Beizen und eine Überalterung durchgeführt werden, um die Oxidschicht zu entfernen und den gelösten Kohlenstoff teilweise oder vollständig auszuscheiden. Zu diesem Zweck werden, nachdem eine genügend große Anzahl von Bunden die erste Behandlungsstufe durchlaufen haben, diese Bunde nach Durchlauf eines Zwischenlagers 19 wieder den Ablaufhaspeln zugeführt. Das erste Band wird dabei an ein Dummy-Band angeschweißt (bei 3), welches an das letzte Band des ersten Durchlaufes geschweißt worden ist.The bundles annealed and quenched in this way still contain a high proportion of carbon dissolved in iron and are therefore not yet suitable for further processing. Besides, that is Surface covered by a thin layer of oxide. A second pass of the strip through the plant according to FIG. 2 then follows, wherein pickling and aging are carried out in order to remove the oxide layer and to partially or completely remove the dissolved carbon. For this purpose, after a sufficiently large number of bundles have passed through the first treatment stage, these bundles are returned to the decoilers after passing through an intermediate store 19. The first band is welded to a dummy band (at 3), which has been welded to the last band of the first pass.

Beim zweiten Durchlauf durchläuft das Band die Beize 6, Neutralisation 7, Spüle 8 und den Trockner 9, bevor es wieder in den Ofen 10 eintritt. Im Ofen 10 wird das Band unter Schutzgas vorzugsweise induktiv auf die Überalterungstemperatur aufgeheizt, die je nach Stahlgüte 200°C bis 400°C beträgt. Auf dieser Temperatur wird das Band in bekannter Weise ca. 45 bis 60 Sekunden gehalten, wobei je nach Temperatur der im Eisen gelöste Kohlenstoff teilweise oder fast vollständig ausgeschieden wird. Nach der Überalterung wird das Band durch gekühltes Schutzgas auf eine Temperatur unter 100°C abgekühlt, so daß es bei Austritt aus dem Ofen nicht mehr oxidiert.In the second pass, the strip passes through the pickle 6, neutralization 7, sink 8 and dryer 9 before it enters the oven 10 again. In the furnace 10, the strip is preferably inductively heated under protective gas to the aging temperature which, depending on the steel grade, is 200 ° C. to 400 ° C. The strip is held at this temperature in a known manner for about 45 to 60 seconds, the carbon dissolved in the iron being partially or almost completely eliminated, depending on the temperature. After aging, the strip is cooled to a temperature below 100 ° C. by means of cooled protective gas, so that it no longer oxidizes when it leaves the furnace.

Das Band wird danach durch den trockenen Wassertank dem Aufwickelhaspel 18 zugeführt und zu Bunden aufgewickelt.The tape is then fed through the dry water tank to the take-up reel 18 and wound into bundles.

Nachdem die gewünschte Zahl der Bunde in der zweiten Verfahrensstufe (Überalterungsstufe) durch die Anlage gelaufen sind, wird diese wieder auf die erste Verfahrensstufe (Glühstufe) umgestellt. Hierzu wird wieder ein Dummy-Band an das letzte Band der zweiten Verfahrensstufe angeschweißt.After the desired number of bundles has passed through the plant in the second process stage (aging stage), this is switched back to the first process stage (annealing stage). For this purpose, a dummy band is welded onto the last band of the second process stage.

Claims (2)

1. Verfahren zum Glühen von kaltgewalztem Stahlband, bei dem das Band von Ablaufhaspeln abgewickelt nacheinander durch die folgenden Behandlungsstationen hinduchgeführt wird: Eine Querteilschere (2), eine Schweißmaschine (3) einen Bandspeicher (4), einen Bandreinigungsteil (5, 7, 8, 9) einem Glühofen (10) mit Aufheiz- (11), Halte-(12) und Abkühlzone (13), eine Wasserabschreckvorrichtung (14), eine Heizanlage (6) zum Entfernen der Oxidschicht, anschließender Neutralisation (7), Spüle (8), und Trockner (9), einen Überalterungsofen (10) mit Aufheiz- (11), Überalterungs- (12) und Abkühlzone (13), einen weiteren Bandspeicher (16), eine Querteilschere (17), bevor es auf einen von ggf. mehreren Aufwickelhaspeln (18) aufgehaspelt wird, dadurch gekennzeichnet,
daß - insbesondere bei der Verarbeitung kleinerer Bandmengen - das Band nach dem Verlassen der Wasserabschreckvorrichtung (14) nach Durchlaufen der Trockenvorrichtung (15) und des Bandspeichers (16) zu einem Bund aufgehaspelt und als Bund einem Zwischenlager (19) zugeführt wird und daß das Bund vom Zwischenlager (19) kommend erneut dem Ablaufhaspel (1) zugeführt wird, um ein zweites Mal durch die jetzt als Überalterungslinie betriebene Glühlinie (10 bis 13) geführt zu werden, wobei das Band in bekannter Weise zunächst gebeizt (6), neutralisiert (7), gespült (8), getrocknet (9) und im Glühofen (10) bei geeigneter Temparatur in üblicher Weise überaltert (12) und anschließend aufgehaspelt (18) wird.1. A method for annealing cold-rolled steel strip, in which the strip is unwound from reels and passed through the following treatment stations one after the other: a cross-cut shear (2), a welding machine (3), a strip store (4), a strip cleaning part (5, 7, 8, 9) an annealing furnace (10) with heating (11), holding (12) and cooling zone (13), a water quenching device (14), a heating system (6) for removing the oxide layer, subsequent neutralization (7), sink (8 ), and dryer (9), an aging furnace (10) with heating (11), aging (12) and cooling zone (13), a further band store (16), a cross-cut shear (17) before it is placed on one of possibly several reels (18) are wound up, characterized,
that - especially when processing smaller amounts of tape - the tape after leaving the water quenching device (14) after passing through the drying device (15) and the tape storage (16) reeled into a bundle and fed as a bundle to an intermediate store (19) and that the bundle coming from the interim storage facility (19) is again fed to the decoiler (1) in order to be guided a second time through the annealing line (10 to 13) now operated as an aging line, the strip first being pickled (6), neutralized (7 ), rinsed (8), dried (9) and aged (12) in the annealing furnace (10) with suitable temperature in the usual way and then rewound (18). 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
daß vor dem Durchlaufen des Endes des letzten Bundes beim ersten Durchlauf an das Bandende ein Dummy-Band geschweißt wird, an dessen Ende der Anfang des ersten Bundes des zweiten Durchlaufes angeschweißt wird.2. The method according to claim 1,
characterized,
that before passing through the end of the last bundle, a dummy strip is welded to the end of the strip on the first pass, at the end of which the beginning of the first bundle of the second pass is welded.
EP86730028A 1985-03-20 1986-02-21 Semicontinuous annealing process Expired - Lifetime EP0195739B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3510050 1985-03-20
DE19853510050 DE3510050A1 (en) 1985-03-20 1985-03-20 SEMI-CONTINUOUS GLOWING PLANT

Publications (3)

Publication Number Publication Date
EP0195739A2 true EP0195739A2 (en) 1986-09-24
EP0195739A3 EP0195739A3 (en) 1988-08-10
EP0195739B1 EP0195739B1 (en) 1990-06-27

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EP86730028A Expired - Lifetime EP0195739B1 (en) 1985-03-20 1986-02-21 Semicontinuous annealing process

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US (1) US4710240A (en)
EP (1) EP0195739B1 (en)
JP (1) JPS61221333A (en)
DE (2) DE3510050A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT411821B (en) * 2002-06-20 2004-06-25 Heinz Ing Altendorfer Device for treating and/or refining a metal strip or wire present in a bundle form, e.g. by descaling, cleaning, annealing, metal coating or paint coating, comprises treating chambers arranged in a screw-like manner around the metal strip

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11342402A (en) * 1998-05-29 1999-12-14 Kawasaki Steel Corp Cold-rolling facility
US9708686B2 (en) 2015-01-02 2017-07-18 The Beoing Company Apparatuses and methods for processing a metal ribbon
WO2023198634A1 (en) * 2022-04-11 2023-10-19 Sms Group Gmbh Heat treatment line for a hot strip

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127190A2 (en) * 1983-05-31 1984-12-05 Nippon Steel Corporation Method and apparatus for continuously annealing a steel sheet

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3106811C2 (en) * 1981-02-24 1988-10-20 Klöckner-Werke AG, 4100 Duisburg Plant for the continuous treatment of sheet metal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127190A2 (en) * 1983-05-31 1984-12-05 Nippon Steel Corporation Method and apparatus for continuously annealing a steel sheet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT411821B (en) * 2002-06-20 2004-06-25 Heinz Ing Altendorfer Device for treating and/or refining a metal strip or wire present in a bundle form, e.g. by descaling, cleaning, annealing, metal coating or paint coating, comprises treating chambers arranged in a screw-like manner around the metal strip

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DE3510050C2 (en) 1987-07-30
EP0195739A3 (en) 1988-08-10
JPS61221333A (en) 1986-10-01
JPH0218366B2 (en) 1990-04-25
DE3510050A1 (en) 1986-12-04
US4710240A (en) 1987-12-01
EP0195739B1 (en) 1990-06-27
DE3672277D1 (en) 1990-08-02

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