EP0195739B1 - Semicontinuous annealing process - Google Patents

Semicontinuous annealing process Download PDF

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Publication number
EP0195739B1
EP0195739B1 EP86730028A EP86730028A EP0195739B1 EP 0195739 B1 EP0195739 B1 EP 0195739B1 EP 86730028 A EP86730028 A EP 86730028A EP 86730028 A EP86730028 A EP 86730028A EP 0195739 B1 EP0195739 B1 EP 0195739B1
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EP
European Patent Office
Prior art keywords
strip
coil
annealing
zone
store
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
EP86730028A
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German (de)
French (fr)
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EP0195739A3 (en
EP0195739A2 (en
Inventor
Klaus Dr.-Ing. Fromman
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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Publication date
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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 a method for the comparison of cold-rolled steel blend.
  • Cold rolled steel blend must be annealed after cold rolling in order to be used for further processing, e.g. by deep drawing to achieve the required mechanical properties.
  • the annealing of cold rolled steel strip is done e.g. Currently still predominantly in hood ventilation systems. 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 hood scraper 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 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 bell anneal and is only about 10 minutes.
  • the disadvantage of continuous annealing is that, in their current conception, 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 process 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.
  • the invention advantageously provides a semi-continuous annealing process in which an otherwise customary separate aging furnace is saved by two passes through an annealing system and operation of the annealing furnace as an aging furnace. 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 over-furnace furnace in this system, is bypassed during the first pass of the belt.
  • the cold-rolled strip first passes 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, primarily inductively 11, and briefly kept at annealing temperature 12 (under protective gas). The strip is then slowly cooled 13 with a cooled protective gas from the holding temperature between 700 ° C and 850 ° C to a lower temperature 13 and very quickly quenched in a known manner after exiting the furnace in a water tank 14, the quenching speed depending on the strip thickness approx Can be 500 to 2000 ° C per second. Depending on the steel grade, the water tank can be broken off 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, the reel and a band store and a pair of scissors 17 are arranged upstream.
  • 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.
  • the surface is covered by a thin oxide layer.
  • pickling and aging being carried out in order to remove the oxide layer and to partially or completely remove the dissolved carbon.
  • these bundles are returned to the decoilers after passing through an intermediate storage 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 furnace 10 again.
  • the strip is heated inductively, preferably under protective gas, to the aging temperature, which is 200 ° C. to 400 ° C., depending on the steel grade.
  • 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 ends.

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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)

Description

Die Erfindung betrifft ein Verfahren zum Glichen von kaltgewalztem Stahlblend.The invention relates to a method for the comparison of cold-rolled steel blend.

Kaltgewalztes Stahlblend muß nach dem Kaltwalzen gelüht 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 Haubenlühanlagen. 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 Haubenlühe ist, daß damit hochfeste Stähle, besonders die sogenannten Dual-Phase-Stähl nur in sehr geschränktem Umfang und unter Verwendung zusätzlicher Legierungselemente, hergestellt werden können, wodurch diese Stähle entsprechend teuer werden.Cold rolled steel blend must be annealed after cold rolling in order to be used for further processing, e.g. by deep drawing to achieve the required mechanical properties. The annealing of cold rolled steel strip is done e.g. Currently still predominantly in hood ventilation systems. 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 hood scraper 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 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 bell anneal and is only about 10 minutes. The disadvantage of continuous annealing is that, in their current conception, they require very high investment costs and are therefore only economically interesting for relatively high annual production.

Aufgabe der Erfindung ist es, ein Glüverfahren zu schaffen, mit dem 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 ein halbkontinuierliches Glüverfahren geschaffen, bei dem durch zweimaligen Durchlauf durch eine Glühanlage und Betreiben des Glühofens als Überalterungsofen ein sonst üblicher separater Überalterungsofen eingespart wird. Dadurch reduziert sich der Anlagenaufwand erheblich; die Bau-länge wird stark reduziert. Die Beize, die bei dieser Anlage vor dem Glühofen bzw. Überatteruhgsofen angeordnet sein muß, wird beim ersten Durchlauf des Bandes umfahren.The object of the invention is to provide an annealing process 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. The invention advantageously provides a semi-continuous annealing process in which an otherwise customary separate aging furnace is saved by two passes through an annealing system and operation of the annealing furnace as an aging furnace. 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 over-furnace furnace in this system, is bypassed during the first pass of the belt.

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 durchläuf zunächst die bekannte Verfahrenstufen 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, wobie die Abschreckungsgeschwindigkeit je nach Banddicke ca. 500 bis 2000°C pro Sekunde betragen kann. Das Abschrechen im Wassertank kann je nach Stahlglüte 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 und ein Bandspeicher und eine Schere 17 vorgeordnet.The cold-rolled strip first passes 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, primarily inductively 11, and briefly kept at annealing temperature 12 (under protective gas). The strip is then slowly cooled 13 with a cooled protective gas from the holding temperature between 700 ° C and 850 ° C to a lower temperature 13 and very quickly quenched in a known manner after exiting the furnace in a water tank 14, the quenching speed depending on the strip thickness approx Can be 500 to 2000 ° C per second. Depending on the steel grade, the water tank can be broken off 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, the reel and a band store and a pair of scissors 17 are arranged upstream.

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 geeignete. Außerdem ist, die Oberfläche von einer dünnen Oxidschicht bedeckt. Es folgt deshalb in 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 Behandlüngsstufe 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. In addition, the surface is covered by a thin oxide layer. This is followed by a second pass of the strip through the system according to FIG. 2, pickling and aging being 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 storage 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 en 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 nich mehr oxidiert.In the second pass, the strip passes through the pickle 6, neutralization 7, sink 8 and dryer 9 before it enters the furnace 10 again. In the furnace 10, the strip is heated inductively, preferably under protective gas, to the aging temperature, which is 200 ° C. to 400 ° C., depending on the steel grade. 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 trockenenen Wassertank dem Aufwickelhaspel 18 zugeführt und zu Benden aufgewickelt.The tape is then fed through the dry water tank to the take-up reel 18 and wound into ends.

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 y- band is welded onto the last band of the second process stage.

Claims (2)

1. A process for the annealing of cold rolled steel strip, in particular for the processing of small strip quantities, wherein the strip is unwound by uncoiling winches and is conducted successively through the following treatment stations: a transverse parting shear (2), a welding machine (3), a strip store (4), a strip purification section (5, 7, 8, 9), an annealing furnace (10) with heating zone (11), maintaining zone (12) and cooling zone (13), a water quenching device (14), a heating device (6) for the removal of the oxide layer, an adjoining neutralisation stage (7), flushing stage (8) and drying stage (9), an over-ageing furnace (10) with heating zone (11), over-ageing zone (12) and cooling zone (13), a further strip store (16) and a transverse parting shear (17), before it is wound onto one of possibly several coiling winches (18), characterised in that having emerged from the water quenching device (14) and having passed through the drying device (15) and the strip store (16) the strip is wound by a winch into a coil and conducted in the form of a coil to an intermediate store (19) and that the coil emerging from the intermediate store (19) is conducted again to the uncoiling winch (1) in order to be conducted a second time through the annealing line (10 to 13) which is now operated as over-ageing line, where the strip, in a manner known per se, is firstly pickled (6), neutralised (7), flushed (8), dried (9) and over-aged (12) at a suitable temperature and in a conventional fashion in the annealing furnace (10), and is then wound into the form of a coil by a winch (18).
2. A process as claimed in Claim 1, characterised in that before the passage of the end of the last coil during the first cycle, and the end of the strip is welded to a dummy strip whose end is in turn welded to the beginning of the first coil of the second cycle.
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
DE19853510050 DE3510050A1 (en) 1985-03-20 1985-03-20 SEMI-CONTINUOUS GLOWING PLANT
DE3510050 1985-03-20

Publications (3)

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

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Application Number Title Priority Date Filing Date
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)

Families Citing this family (4)

* 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
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
US9708686B2 (en) 2015-01-02 2017-07-18 The Beoing Company Apparatuses and methods for processing a metal ribbon
DE102023203244A1 (en) * 2022-04-11 2023-10-12 Sms Group Gmbh Heat treatment line for hot strip

Family Cites Families (2)

* 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
ES8600785A1 (en) * 1983-05-31 1985-11-01 Nippon Steel Corp Method and apparatus for continuously annealing a steel sheet.

Also Published As

Publication number Publication date
DE3510050C2 (en) 1987-07-30
US4710240A (en) 1987-12-01
EP0195739A3 (en) 1988-08-10
JPS61221333A (en) 1986-10-01
DE3510050A1 (en) 1986-12-04
JPH0218366B2 (en) 1990-04-25
EP0195739A2 (en) 1986-09-24
DE3672277D1 (en) 1990-08-02

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