EP0889139A1 - Device for flushing cold drawn coiled pipes in a roller-hearth furnace - Google Patents

Device for flushing cold drawn coiled pipes in a roller-hearth furnace Download PDF

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Publication number
EP0889139A1
EP0889139A1 EP98890148A EP98890148A EP0889139A1 EP 0889139 A1 EP0889139 A1 EP 0889139A1 EP 98890148 A EP98890148 A EP 98890148A EP 98890148 A EP98890148 A EP 98890148A EP 0889139 A1 EP0889139 A1 EP 0889139A1
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EP
European Patent Office
Prior art keywords
hearth furnace
pressure vessel
roller
cold drawn
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.)
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Application number
EP98890148A
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German (de)
French (fr)
Inventor
Peter Helmut Dipl.-Ing. Ebner
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Individual
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Individual
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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
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum

Definitions

  • the invention relates to a device for washing cold-drawn, a bundle forming pipes in a roller hearth furnace.
  • Cold drawn pipes usually have traction agent residues on the inside.
  • the pipes can reach a length of several 100 m, especially with light or non-ferrous metals.
  • a purge with protective gas usually with an N 2 / H 2 / O 2 / Ar mixture, is carried out by using this mixture is inserted into a pipe end.
  • the protective gas for purging prior to the heat treatment of the tube is carried out by hand outside the furnace, the protective gas composition being selected such that a reduction in the C content on the inside of the tube is reduced to ⁇ 0.01 mg / dm 2 during the heat treatment (DE-OS 30 04 455).
  • the rinsing during the heat treatment of the pipe is also known. This takes place via a protective gas coupling system arranged on the furnace wall in such a way that a gas-tight connection with the transport grate carrying the annealing material is created via a coupling lance. A pipe end is then connected to the gas coupling part of the grate on these outside the furnace. This makes it possible to press protective gas through the pipe at certain points in the furnace at high pressure. Drawing agent residues on the inner wall of the pipe are reduced and fed to the furnace atmosphere at the other end of the pipe, an H 2 / N 2 mixture usually being used as the rinsing agent.
  • the invention has for its object to eliminate these shortcomings and a simple To create device that does not require any modifications in the current ovens power and in new systems without a protective gas coupling device on the furnace walls gets along.
  • the invention fulfills this task in that a storage for the detergent serving pressure vessel with small predictable outlet opening and a coupling element to the tube bundle is provided.
  • the pressure vessel is used as a storage tank outside of the furnace with protective gas certain pressure which is then filled through the predictable small opening Shielding gas with critical outflow speed via the coupling system Tube bundle feeds.
  • protective gas certain pressure which is then filled through the predictable small opening Shielding gas with critical outflow speed via the coupling system Tube bundle feeds.
  • a special pressure vessel does not necessarily have to be provided, but rather it is also quite possible that the transport grate of the furnace is at least partially is designed as a gas-tight welded tube construction and as a pressure vessel serves.
  • a pressure vessel 1 is provided outside the actual furnace, which is filled up to a predetermined pressure as a storage for the detergent (protective gas) is and from which the protective gas via a small predictable opening 2 and a coupling system 3 is fed to the tube bundle 4.
  • a small predictable opening 2 and a coupling system 3 is fed to the tube bundle 4.
  • 5 is the filling opening referred to, which can of course also be arranged elsewhere.
  • the transport grate 6 is designed as a gas-tight welded tubular structure and serves itself as a pressure vessel 1a.
  • the pressure vessel 1, 1a can be filled with a liquid, that evaporate during treatment.
  • a degreaser e.g. B. a water / alcohol mixture can be used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Winding, Rewinding, Material Storage Devices (AREA)
  • Metal Extraction Processes (AREA)
  • Tunnel Furnaces (AREA)

Abstract

The apparatus incorporates as a storage unit for the flushing agent a pressurised container (1) with a small, calculatable outlet opening (3) and an element (3) for coupling the container to a pipe bundle (4).

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Spülen kaltgezogener, einen Bund bildender Rohre in einen Rollenherdofen.The invention relates to a device for washing cold-drawn, a bundle forming pipes in a roller hearth furnace.

Kaltgezogene Rohre weisen an ihrer Innenseite in der Regel Ziehmittelrückstände auf. Dabei können die Rohre speziell bei Leicht- bzw. Buntmetall eine Länge von mehreren 100 m erreichen. Bei Kupferrohren wird, um sie vor Pit-Korrosion zu schützen, vor oder während der Wärmebehandlung in einem Rollenherdofen eine Spülung mit Schutzgas, und zwar in der Regel mit einem N2/H2/O2/Ar-Gemisch durchgeführt, indem dieses Gemisch in ein Rohrende eingebracht wird.Cold drawn pipes usually have traction agent residues on the inside. The pipes can reach a length of several 100 m, especially with light or non-ferrous metals. For copper pipes, in order to protect them against pit corrosion, before or during the heat treatment in a roller hearth furnace, a purge with protective gas, usually with an N 2 / H 2 / O 2 / Ar mixture, is carried out by using this mixture is inserted into a pipe end.

Das Zuführen des Schutzgases zur Spülung vor der Wärmebehandlung des Rohres wird von Hand aus außerhalb des Ofens durchgeführt, wobei die Schutzgaszusammensetzung so gewählt wird, daß während der Wärmebehandlung ein Abbau des C-Gehaltes an der Rohrinnenseite auf ≤ 0,01mg/dm2 reduziert wird (DE-OS 30 04 455).The protective gas for purging prior to the heat treatment of the tube is carried out by hand outside the furnace, the protective gas composition being selected such that a reduction in the C content on the inside of the tube is reduced to ≤ 0.01 mg / dm 2 during the heat treatment (DE-OS 30 04 455).

Es ist selbstverständlich auch die Spülung während der Wärmebehandlung des Rohres bekannt. Dies erfolgt über ein an der Ofenwand angeordnetes Schutzgas-Kupplungssystem in der Weise, daß über eine Kupplungslanze eine gasdichte Verbindung mit dem das Glühgut tragenden Transportrost geschaffen wird. Auf diesen wird dann außerhalb des Ofens ein Rohrende mit dem Gaskupplungsteil des Rostes verbunden. Dadurch ist es möglich, Schutzgas an bestimmten Stellen des Ofens mit hohem Druck durch das Rohr zu pressen. Ziehmittelrückstände an der Rohrinnenwand werden reduziert und beim anderen Rohrende der Ofenatmosphäre zugeführt, wobei als Spülmittel üblicherweise ein H2/N2-Gemisch verwendet wird. Of course, the rinsing during the heat treatment of the pipe is also known. This takes place via a protective gas coupling system arranged on the furnace wall in such a way that a gas-tight connection with the transport grate carrying the annealing material is created via a coupling lance. A pipe end is then connected to the gas coupling part of the grate on these outside the furnace. This makes it possible to press protective gas through the pipe at certain points in the furnace at high pressure. Drawing agent residues on the inner wall of the pipe are reduced and fed to the furnace atmosphere at the other end of the pipe, an H 2 / N 2 mixture usually being used as the rinsing agent.

Das Spülen von Hand aus stellt eine aufwendige Arbeit dar. Bei der Spülung während der Wärmebehandlung des Rohres ist eine besondere Ofenkonstruktion erforderlich.Manual rinsing is a time-consuming task. During rinsing during A special furnace construction is required for the heat treatment of the pipe.

Der Erfindung liegt die Aufgabe zugrunde, diese Mängel zu beseitigen und eine einfache Vorrichtung zu schaffen, die bei den derzeitigen Öfen keine Umbauten erforderlich macht und bei Neuanlagen ohne Schutzgas-Kuppelvorrichtung an den Ofenwänden auskommt.The invention has for its object to eliminate these shortcomings and a simple To create device that does not require any modifications in the current ovens power and in new systems without a protective gas coupling device on the furnace walls gets along.

Die Erfindung erfüllt diese Aufgabe dadurch, daß ein als Speicher für das Spülmittel dienender Druckbehälter mit kleiner berechenbarer Auslaßöffnung und einem Kuppelelement zum Rohrbund vorgesehen ist.The invention fulfills this task in that a storage for the detergent serving pressure vessel with small predictable outlet opening and a coupling element to the tube bundle is provided.

Der Druckbehälter wird als Speicher außerhalb des Ofens mit Schutzgas auf einem bestimmten Druck aufgefüllt, der dann über die berechenbare kleine Öffnung das Schutzgas mit kritischer Ausströmgeschwindigkeit über das Kupplungssystem dem Rohrbund zuführt. Durch die Druckentspannung, das Behältervolumen und den Druck am Beginn der Wärmebehandlung ist es ohne weiteres möglich, ohne die notwendige Spülzeit eine ausreichende Schutzgaszuführung zu erreichen. Durch den Erwärmungsvorgang wird sowohl der Druckbehälter als auch das Schutzgas erwärmt und der Spülvorgang im Ofen verlängert.The pressure vessel is used as a storage tank outside of the furnace with protective gas certain pressure which is then filled through the predictable small opening Shielding gas with critical outflow speed via the coupling system Tube bundle feeds. Through the pressure release, the tank volume and the pressure at the beginning of the heat treatment it is possible without the necessary Purging time to achieve a sufficient shielding gas supply. Through the heating process both the pressure vessel and the protective gas are heated and the purging process extended in the oven.

Es braucht nicht unbedingt ein besonderer Druckbehälter vorgesehen zu werden, sondern es ist auch durchaus möglich, daß der Transportrost des Ofens zumindest teilweise als gasdicht geschweißte Rohrkonstruktion ausgebildet ist und als Druckbehälter dient.A special pressure vessel does not necessarily have to be provided, but rather it is also quite possible that the transport grate of the furnace is at least partially is designed as a gas-tight welded tube construction and as a pressure vessel serves.

Bei größeren Anlagen kann es zur Vereinfachung vorteilhaft sein, an den Druckbehälter zwei oder mehrere Rohrbunde anzuschließen.In the case of larger systems, it can be advantageous to simplify the pressure tank to connect two or more coils.

In der Zeichnung ist der Erfindungsgegenstand beispielsweise und rein schematisch dargestellt. Dabei zeigen

  • Fig. 1 das Wesentliche eines Rollenherdofens in Draufsicht und
  • Fig. 2 eine Konstruktionsvariante in Seitenansicht.
    • In the drawing, the subject of the invention is shown, for example, and purely schematically. Show
  • Fig. 1 shows the essentials of a roller hearth furnace in plan view and
  • Fig. 2 shows a construction variant in side view.

    • Gemäß Fig. 1 ist außerhalb des eigentlichen Ofens ein Druckbehälter 1 vorgesehen, der als Speicher für das Spülmittel (Schutzgas) auf einen vorbestimmten Druck aufgefüllt ist und aus dem das Schutzgas über eine kleine berechenbare Öffnung 2 und über ein Kupplungssystem 3 dem Rohrbund 4 zugeführt wird. Mit 5 ist die Einfüllöffnung bezeichnet, die natürlich auch an anderer Stelle angeordnet werden kann.1, a pressure vessel 1 is provided outside the actual furnace, which is filled up to a predetermined pressure as a storage for the detergent (protective gas) is and from which the protective gas via a small predictable opening 2 and a coupling system 3 is fed to the tube bundle 4. With 5 is the filling opening referred to, which can of course also be arranged elsewhere.

    Nach Fig. 2 ist der Transportrost 6 als gasdicht geschweißte Rohrkonstruktion ausgebildet und dient selbst als Druckbehälter 1a. Der Druckbehälter 1, 1a kann mit einer Flüssigkeit, die während der Behandlung verdampft, gefüllt werden. Als Entfettungsmittel ist z. B. ein Wasser/Alkohol-Gemisch verwendbar.2, the transport grate 6 is designed as a gas-tight welded tubular structure and serves itself as a pressure vessel 1a. The pressure vessel 1, 1a can be filled with a liquid, that evaporate during treatment. As a degreaser e.g. B. a water / alcohol mixture can be used.

    Claims (3)

    Vorrichtung zum Spülen kaltgezogener, einen Bund bildender Rohre in einem Rollenherdofen, dadurch gekennzeichnet, daß ein als Speicher für das Spülmittel dienender Druckbehälter (1; la) mit kleiner berechenbarer Auslaßöffnung (2) und einem Kuppelelement (3) zum Rohrbund (4) vorgesehen ist.Device for washing cold drawn tubes forming a bundle in one Roller hearth furnace, characterized in that a serving as a storage for the detergent Pressure vessel (1; la) with a small predictable outlet opening (2) and one Coupling element (3) to the tube collar (4) is provided. Vorrichtung nach Anspruch 1, wobei der Rollenherdofen einen Transportrost aufweist, dadurch gekennzeichnet, daß der Transportrost (6) zumindest teilweise als gasdichtgeschweißte Rohrkonstruktion ausgebildet ist und als Druckbehälter (1a) dient.Apparatus according to claim 1, wherein the roller hearth furnace a transport grate has, characterized in that the transport grate (6) at least partially as is gastight welded tube construction and serves as a pressure vessel (1a). Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß an den Druckbehälter (1; 1a) zwei oder mehrere Rohrbunde (4) angeschlossen sind.Apparatus according to claim 1 or 2, characterized in that on the Pressure vessel (1; 1a) two or more tube bundles (4) are connected.
    EP98890148A 1997-06-06 1998-05-20 Device for flushing cold drawn coiled pipes in a roller-hearth furnace Withdrawn EP0889139A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    AT0097097A AT407125B (en) 1997-06-06 1997-06-06 DEVICE FOR RINSING COLD-DRAWN TUBE-FORMING TUBES IN A ROLLER OVEN
    AT970/97 1997-06-06

    Publications (1)

    Publication Number Publication Date
    EP0889139A1 true EP0889139A1 (en) 1999-01-07

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    ID=3503990

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP98890148A Withdrawn EP0889139A1 (en) 1997-06-06 1998-05-20 Device for flushing cold drawn coiled pipes in a roller-hearth furnace

    Country Status (4)

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    US (1) US6106764A (en)
    EP (1) EP0889139A1 (en)
    JP (1) JPH1177153A (en)
    AT (1) AT407125B (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN114703433A (en) * 2022-04-13 2022-07-05 常熟致圆微管技术有限公司 Preparation method of biodegradable medical metal magnesium and magnesium alloy plate

    Families Citing this family (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN102274872B (en) * 2011-05-26 2014-12-03 江苏兴荣美乐铜业有限公司 Apparatus for removing oil membrane on external surface of metal coil pipe
    ES2947497T3 (en) * 2013-02-04 2023-08-10 La Farga Tub S L Copper tube for the construction industry and process for its preparation

    Citations (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CH405379A (en) * 1961-06-29 1966-01-15 Elmore S Metall Aktiengesellsc Process for bright annealing of long metal tubes and annealing furnace for carrying out the process
    DE2418495B1 (en) * 1974-04-11 1975-07-10 Mannesmannroehren-Werke Ag, 4000 Duesseldorf Device for the continuous annealing of tubes and hollow bodies
    FR2308436A1 (en) * 1975-04-25 1976-11-19 Cit Alcatel Avoiding carbon deposits during annealing, from lubricants - in the bore of drawn copper tubes, by sweeping with nitrogen
    FR2349117A1 (en) * 1976-04-20 1977-11-18 Trefimetaux DEVICE AND PROCEDURE FOR CIRCULATING A GAS IN LARGE LENGTH TUBE CROWNS DURING HEAT TREATMENT
    JPH07224393A (en) * 1994-02-10 1995-08-22 Hitachi Cable Ltd Heat treatment device for metallic pipe
    JPH07224394A (en) * 1994-02-10 1995-08-22 Hitachi Cable Ltd Method for heat-treating metallic tube
    JPH0959721A (en) * 1995-08-22 1997-03-04 Kobe Steel Ltd Heat treatment of metallic tubular coil

    Family Cites Families (4)

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    Publication number Priority date Publication date Assignee Title
    LU80891A1 (en) * 1979-02-07 1980-09-24 Liege Usines Cuivre Zinc SANITARY TUBES OF PHOSPHORUEX COPPER OR CORROSION-RESISTANT PHOSPHORUS COPPER ALLOYS AND PROCESS FOR THEIR PRODUCTION
    DE3119539A1 (en) * 1981-05-16 1982-12-09 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Process for the treatment of copper pipes
    US4398971A (en) * 1981-12-31 1983-08-16 Aga Aktiebolag Method of heating, holding or heat treatment of metal material
    IT1177873B (en) * 1984-07-04 1987-08-26 Centro Speriment Metallurg DEVICE FOR COOLING HOT ROLLED FLATS

    Patent Citations (7)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CH405379A (en) * 1961-06-29 1966-01-15 Elmore S Metall Aktiengesellsc Process for bright annealing of long metal tubes and annealing furnace for carrying out the process
    DE2418495B1 (en) * 1974-04-11 1975-07-10 Mannesmannroehren-Werke Ag, 4000 Duesseldorf Device for the continuous annealing of tubes and hollow bodies
    FR2308436A1 (en) * 1975-04-25 1976-11-19 Cit Alcatel Avoiding carbon deposits during annealing, from lubricants - in the bore of drawn copper tubes, by sweeping with nitrogen
    FR2349117A1 (en) * 1976-04-20 1977-11-18 Trefimetaux DEVICE AND PROCEDURE FOR CIRCULATING A GAS IN LARGE LENGTH TUBE CROWNS DURING HEAT TREATMENT
    JPH07224393A (en) * 1994-02-10 1995-08-22 Hitachi Cable Ltd Heat treatment device for metallic pipe
    JPH07224394A (en) * 1994-02-10 1995-08-22 Hitachi Cable Ltd Method for heat-treating metallic tube
    JPH0959721A (en) * 1995-08-22 1997-03-04 Kobe Steel Ltd Heat treatment of metallic tubular coil

    Non-Patent Citations (2)

    * Cited by examiner, † Cited by third party
    Title
    PATENT ABSTRACTS OF JAPAN vol. 095, no. 011 26 December 1995 (1995-12-26) *
    PATENT ABSTRACTS OF JAPAN vol. 097, no. 007 31 July 1997 (1997-07-31) *

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN114703433A (en) * 2022-04-13 2022-07-05 常熟致圆微管技术有限公司 Preparation method of biodegradable medical metal magnesium and magnesium alloy plate

    Also Published As

    Publication number Publication date
    AT407125B (en) 2000-12-27
    JPH1177153A (en) 1999-03-23
    ATA97097A (en) 2000-05-15
    US6106764A (en) 2000-08-22

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