EP1001856B1 - METHOD FOR PRODUCING WELDED Cu AND Cu ALLOY PIPES - Google Patents

METHOD FOR PRODUCING WELDED Cu AND Cu ALLOY PIPES Download PDF

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Publication number
EP1001856B1
EP1001856B1 EP98943664A EP98943664A EP1001856B1 EP 1001856 B1 EP1001856 B1 EP 1001856B1 EP 98943664 A EP98943664 A EP 98943664A EP 98943664 A EP98943664 A EP 98943664A EP 1001856 B1 EP1001856 B1 EP 1001856B1
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EP
European Patent Office
Prior art keywords
strip
pipe
casting
rolling
steps
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Expired - Lifetime
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EP98943664A
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German (de)
French (fr)
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EP1001856A1 (en
Inventor
Erling Roller
Peter Kalkenings
Herbert Berendes
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SMS Siemag AG
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SMS Demag AG
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0807—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off
    • B21C37/0811—Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off removing or treating the weld bead
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/003—Rolling non-ferrous metals immediately subsequent to continuous casting, i.e. in-line rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/083—Supply, or operations combined with supply, of strip material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/30—Finishing tubes, e.g. sizing, burnishing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B2003/005—Copper or its alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • the invention relates to a method for producing welded tubes Copper and copper alloys in a combined production line consisting of a primary material casting plant, a hot rolling mill, a pipe forming and Welding line and a pulling device for the welded pipe.
  • Seamless pipes are, for example, via the process routes: solid continuous casting, Extrusion, cold vocationalage and drawing are made, the cold vocational also can be omitted. It is also known to use the solid strand in one Hole punching, punching cold and then to the finished dimension pull. Also worth mentioning are processes in which a hollow strand is cast, which is then subjected to the drawing process after the cold vocationalage. All described methods have disadvantages; high extrusion results Manufacturing costs, the tube qualities are not sufficient for hollow continuous casting. Seamless pipes also have poor wall thickness tolerances.
  • Welded pipes are usually made from continuously cast slabs manufactured, which are pre-rolled in hot-plate mills, then cold-rolled, be longitudinally divided and welded. Following the welding process, a Drawing the pipes using conventional drawing methods.
  • a disadvantage of the Pipe welding processes are the high strip manufacturing cost that pipe manufacturing make uneconomical.
  • the belt is manufactured using various processes. It is common Continuous casting of slabs, hot rolling of the slabs, milling of the Surfaces and subsequent cold rolling, the coiling of the cold rolled Tape and subsequent slitting into strips for further processing are fed.
  • the advantage of the cold strip produced in this way is the high level achievable capacities of more than 100,000 t / a with good surface quality.
  • the discontinuous process and the high production costs are disadvantageous.
  • Another method suggests casting thin slabs that are hot rolled make broadband unnecessary. Following this, the Surfaces of the strip are milled before the strip is cold rolled, coated and in strips is divided lengthways. This process can be carried out continuously, medium capacities of less than 100,000 t / a can be achieved with a good surface quality. Also this method has the disadvantage that the manufacturing costs are too high.
  • a third method is known as the so-called high reduction method.
  • the strip in graphite molds with a casting speed v 1 m / min cast, the surfaces are milled, the tape is with high stitch decrease cold rolled, coiled and cut lengthways into strips. This process can be continuous operated, the surface qualities are good. Disadvantages of the procedure are the small capacities around 10,000 t / a with high manufacturing costs.
  • the aim of the present invention is to provide an improved process for the production of inexpensive pipes with high dimensional accuracy and surface quality To create copper and copper alloys on the rolled strip longitudinally welded pipes is processed.
  • the profitability also for the production of small to large quantities (between 10,000 to 100,000 t / a) sought.
  • the method steps according to the invention are in the characterizing part of the Claim 1 described by the sequence of process steps a) to j). It has been found that when casting a supporting strip in the specified Dimension range and the intended casting speed Tailor-made production of the strips is possible, so that a slitting of a pre-rolled sheet becomes unnecessary.
  • the strips have good surface quality and cheap material values at low manufacturing costs.
  • the casting of the supporting strip can according to special features of the invention either on a belt caster or on a casting wheel. Both Casting processes are characterized by high casting speeds and are therefore for the economical production of the strips with the corresponding Dimensions particularly suitable for immediate further processing, whereby Casting wheels have so far only been used in wire production.
  • Hot rolling of the pre-strip takes place between 600 ° C and 900 ° C, so that makes it possible Process to produce grain sizes in the material of 30-40 ⁇ m, which according to Cold rolling better conditions when forming the strips into welding tubes Offer.
  • the descaling of the hot-rolled pre-strip can be done in line with conventional ones Descaling processes, for example by chemical pickling.
  • a known one can be used to pull the longitudinal seam tube Drawing process with the steps decoiling, drum drawing or continuous Pull straight, if necessary intermediate annealing (with the soft and soft grades Semi-hard), finish drawing and soft annealing if necessary (e.g. at Heat exchanger tubes) are used.
  • the inventive method is advantageous because it is in a continuous Process flow is economically capable of welding copper pipes and tubes made of copper alloys in low to high capacity (10,000 to 100,000 t / a) to manufacture, with internally finned pipes even down to 1000 t / a and less.
  • the continuous process sequence using casting machines with very high casting speeds on the one hand enables the high capacity without on the other hand negatively affect the quality of the pipes.
  • the surface of the cast tape corresponds despite the absence of that in the known prior art intended milling of the belt surface the conditions for Precision cold strips for pipe production.
  • the one that arises during hot rolling Grain sizes from 30 to 40 ⁇ m enable more favorable conditions for molding of the strips into welding tubes than was previously the case with soft (annealed) material was possible.
  • the method according to the invention is used for the first time in practice created a useful method for producing welded non-ferrous metal pipes, the due to its high capacity, flexibility and low cost the does not have the disadvantages described in the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Metal Rolling (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Continuous Casting (AREA)

Abstract

A process for producing welded pipes, from Cu and Cu alloys in a combined production line, having a casting installation for raw materials, a hot-rolling mill, a pipe-shaping and welding section and a drawing device for the welded pipe. The process has the sequence of the following process steps:a. casting of a virtually endless initial strip,b. hot-rolling of the cast initial strip at a rolling speed=casting speedxextension, to form an intermediate strip,c. cooling of the intermediate strip to <=100° C. to RT and descaling of the surface of the intermediate strip,d. cold-rolling of the intermediate strip to form a strip,e. coiling of the untrimmed strip to form coils of predetermined weights, the steps a to e being carried out as an in-line process followed, directly or after interim storage, by the following further operating steps,f. unwinding and shaping of the strip to form a longitudinal seam pipe,g. welding of the longitudinal seam to form a longitudinal seam pipe,h. if necessary, external and internal deburring of the pipei. finishing to size, which is followed, immediately or after interim storage, by the following final operating step, andj. drawing of the welded pipe in at least one drawing stage to form the finished pipe, if the welded pipe does not already constitute the finished pipe.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von geschweißten Rohren aus Kupfer und Kupferlegierungen in einer kombinierten Fertigungslinie bestehend aus einer Vormaterial-Gießanlage, einem Warmwalzwerk, einer Rohreinform- und Schweißstrecke sowie einer Zieheinrichtung für das geschweißte Rohr.The invention relates to a method for producing welded tubes Copper and copper alloys in a combined production line consisting of a primary material casting plant, a hot rolling mill, a pipe forming and Welding line and a pulling device for the welded pipe.

Bei Kupferrohren und Rohren aus Kupferlegierungen unterscheidet man zwischen nahtlosen Rohren und geschweißten Rohren.A distinction is made between copper pipes and pipes made of copper alloys seamless pipes and welded pipes.

Nahtlose Rohre werden beispielsweise über die Prozeßrouten: Massivstranggießen, Strangpressen, Kaltpilgern und Ziehen hergestellt, wobei das Kaltpilgern auch entfallen kann. Ebenfalls bekannt ist es, den Massivstrang in einem Schrägwalzlochverfahren zu lochen, kaltzupilgem und im Anschluß auf Fertigmaß zu ziehen. Zu erwähnen sind auch Verfahren, bei denen ein Hohlstrang gegossen wird, der dann nach dem Kaltpilgern dem Ziehverfahren unterzogen wird. Alle beschriebenen Verfahren haben Nachteile; beim Strangpressen entstehen hohe Herstellkosten, beim Hohlstranggießen sind die Rohrqualitäten nicht ausreichend. Nahtlos hergestellte Rohre haben außerdem schlechte Wanddickentoleranzen.Seamless pipes are, for example, via the process routes: solid continuous casting, Extrusion, cold pilgrimage and drawing are made, the cold pilgrimage also can be omitted. It is also known to use the solid strand in one Hole punching, punching cold and then to the finished dimension pull. Also worth mentioning are processes in which a hollow strand is cast, which is then subjected to the drawing process after the cold pilgrimage. All described methods have disadvantages; high extrusion results Manufacturing costs, the tube qualities are not sufficient for hollow continuous casting. Seamless pipes also have poor wall thickness tolerances.

Geschweißte Rohre werden in der Regel aus stranggegossenen Brammen hergestellt, die in Blechwarmwalzwerken vorgewalzt, anschließend kaltgewalzt, längsgeteilt und geschweißt werden. Im Anschluß an den Schweißvorgang erfolgt ein Ziehen der Rohre nach herkömmlichen Ziehverfahren. Nachteilig bei den Rohrschweißverfahren sind die hohen Bandherstellkosten, die die Rohrherstellung unwirtschaftlich machen. Welded pipes are usually made from continuously cast slabs manufactured, which are pre-rolled in hot-plate mills, then cold-rolled, be longitudinally divided and welded. Following the welding process, a Drawing the pipes using conventional drawing methods. A disadvantage of the Pipe welding processes are the high strip manufacturing cost that pipe manufacturing make uneconomical.

Die Bandherstellung erfolgt nach verschiedenen Verfahren. Üblich ist das Stranggießen von Brammen, das Warmwalzen der Brammen, das Fräsen der Oberflächen und anschließendes Kaltwalzen, das Aufcoilen des kaltgewalzten Bandes und anschließendes Längsteilen in Strips, die der weiteren Verarbeitung zugeführt werden. Der Vorteil des so erzeugten Kaltbandes liegt in den hohen erreichbaren Kapazitäten von mehr als 100.000 t/a bei guter Oberflächenqualität. Nachteilig sind der diskontinuierliche Prozeß und die hohen Herstellkosten.The belt is manufactured using various processes. It is common Continuous casting of slabs, hot rolling of the slabs, milling of the Surfaces and subsequent cold rolling, the coiling of the cold rolled Tape and subsequent slitting into strips for further processing are fed. The advantage of the cold strip produced in this way is the high level achievable capacities of more than 100,000 t / a with good surface quality. The discontinuous process and the high production costs are disadvantageous.

Ein anderes Verfahren schlägt vor, dünne Brammen zu gießen, die ein Warmwalzen von Breitband entbehrlich machen. Im Anschluß daran werden auch hier die Oberflächen des Bandes gefräst, bevor das Band kaltgewalzt, gecoilt und in Strips längsgeteilt wird. Dieses Verfahren ist kontinuierlich ausführbar, mittlere Kapazitäten von weniger als 100.000 t/a sind bei guter Oberflächenqualität erreichbar. Auch dieses Verfahren hat zum Nachteil, daß die Herstellkosten zu hoch sind.Another method suggests casting thin slabs that are hot rolled make broadband unnecessary. Following this, the Surfaces of the strip are milled before the strip is cold rolled, coated and in strips is divided lengthways. This process can be carried out continuously, medium capacities of less than 100,000 t / a can be achieved with a good surface quality. Also this method has the disadvantage that the manufacturing costs are too high.

Ein drittes Verfahren ist als sogenanntes Hochreduktions-Verfahren bekannt. Hierbei wird das Band in Graphitkokillen mit einer Gießgeschwindigkeit v = 1 m/min gegossen, die Oberflächen werden gefräst, das Band wird mit hoher Stichabnahme kaltgewalzt, gecoilt und in Strips längsgeteilt. Dieses Verfahren kann kontinuierlich betrieben werden, die Oberflächenqualitäten sind gut. Nachteil des Verfahrens sind die kleinen Kapazitäten um 10.000 t/a bei hohen Herstellkosten.A third method is known as the so-called high reduction method. in this connection the strip in graphite molds with a casting speed v = 1 m / min cast, the surfaces are milled, the tape is with high stitch decrease cold rolled, coiled and cut lengthways into strips. This process can be continuous operated, the surface qualities are good. Disadvantages of the procedure are the small capacities around 10,000 t / a with high manufacturing costs.

Ziel der vorliegenden Erfindung ist es, ein verbessertes Verfahren zur Herstellung von kostengünstigen Rohren mit hoher Maßgenauigkeit und Oberflächenqualität aus Kupfer und Kupferlegierungen zu schaffen, bei dem gewalztes Band zu längsnahtgeschweißten Rohren verarbeitet wird. Dabei wird die Wirtschaftlichkeit auch für die Herstellung kleinerer bis größerer Mengen (zwischen 10.000 bis 100.000 t/a) angestrebt.The aim of the present invention is to provide an improved process for the production of inexpensive pipes with high dimensional accuracy and surface quality To create copper and copper alloys on the rolled strip longitudinally welded pipes is processed. The profitability also for the production of small to large quantities (between 10,000 to 100,000 t / a) sought.

Die erfindungsgemäßen Verfahrensschritte sind im kennzeichnenden Teil des Patentanspruchs 1 durch die Abfolge der Verfahrensschritte a) bis j) beschrieben. Es hat sich herausgestellt, daß beim Gießen eines Vorbandes im angegebenen Abmessungsbereich und der vorgesehenen Gießgeschwindigkeit ein maßgeschneidertes Herstellen der Strips möglich wird, so daß ein Längsteilen eines vorgewalzten Bleches entbehrlich wird. Die Strips weisen gute Oberflächenqualität und günstige Materialwerte bei niedrigen Herstellungskosten auf.The method steps according to the invention are in the characterizing part of the Claim 1 described by the sequence of process steps a) to j). It has been found that when casting a supporting strip in the specified Dimension range and the intended casting speed Tailor-made production of the strips is possible, so that a slitting of a pre-rolled sheet becomes unnecessary. The strips have good surface quality and cheap material values at low manufacturing costs.

Das Gießen des Vorbandes kann nach besonderen Merkmalen der Erfindung entweder auf einer Bandgießanlage oder auf einem Gießrad erfolgen. Beide Gießverfahren zeichnen sich durch hohe Gießgeschwindigkeiten aus und sind deshalb zur wirtschaftlichen Herstellung der Strips mit den entsprechenden Abmessungen zur unmittelbaren Weiterverarbeitung besonders geeignet, wobei Gießräder bisher nur bei der Drahtherstellung eingesetzt werden.The casting of the supporting strip can according to special features of the invention either on a belt caster or on a casting wheel. Both Casting processes are characterized by high casting speeds and are therefore for the economical production of the strips with the corresponding Dimensions particularly suitable for immediate further processing, whereby Casting wheels have so far only been used in wire production.

Wenn nach einem weiteren Vorschlag der Erfindung vorgesehen ist, daß das Warmwalzen des Vorbandes zwischen 600°C und 900°C erfolgt, so ermöglicht das Verfahren Komgrößen im Material von 30-40 µm herzustellen, die nach dem Kaltwalzen bessere Bedingungen beim Einformen der Bänder zu Schweißrohren bieten.If it is provided according to a further proposal of the invention that Hot rolling of the pre-strip takes place between 600 ° C and 900 ° C, so that makes it possible Process to produce grain sizes in the material of 30-40 µm, which according to Cold rolling better conditions when forming the strips into welding tubes Offer.

Dadurch, daß erfindungsgemäß das Besäumen des Zwischenbandes unmittelbar in der Schweißmaschine erfolgt, entfällt neben dem Längsteilen der Bänder auch ein vorbereitendes Besäumen.The fact that, according to the invention, the trimming of the intermediate belt directly in the welding machine takes place, there is also no need for slitting the strips lengthways preparatory trimming.

Das Entzundern des warmgewalzten Vorbandes kann in Linie nach konventionellen Entzunderungsverfahren, beispielsweise durch chemisches Beizverfahren erfolgen.The descaling of the hot-rolled pre-strip can be done in line with conventional ones Descaling processes, for example by chemical pickling.

Günstigerweise wird nach einem weiteren Merkmal der Erfindung zum Schweißen des Längsnahtrohres ein bekanntes Hochfrequenz-, WIG- oder Laserschweiß-Verfahren mit den Schritten Entcoilen, Richten und Stumpfschweißen des Zwischenbandes, Einformen, Schweißen, Innen- und Außenentgraten (falls HF-geschweißt), Kalibrieren, Ablängen, Coilen und Ausbringen des Innenspans eingesetzt.Favorably, according to a further feature of the invention for welding the Longitudinal seam tube a known high-frequency, TIG or laser welding process with the steps decoiling, straightening and butt welding the intermediate belt, Molding, welding, internal and external deburring (if HF-welded), calibration, Cutting, coiling and spreading the inner chip used.

Zum Ziehen des Längsnahtrohres kann erfindungsgemäß ein bekanntes Ziehverfahren mit den Schritten Entcoilen, Trommelziehen oder kontinuierliches Geradeausziehen, gegebenenfalls Zwischenglühen (bei den Gütestufen Weich und Halbhart), Fertigziehen und gegebenenfalls Weichglühen (beispielsweise bei Wärmetauscherrohren) eingesetzt werden. According to the invention, a known one can be used to pull the longitudinal seam tube Drawing process with the steps decoiling, drum drawing or continuous Pull straight, if necessary intermediate annealing (with the soft and soft grades Semi-hard), finish drawing and soft annealing if necessary (e.g. at Heat exchanger tubes) are used.

Alternativ ist es auch denkbar, nach den erfindungsgemäßen Verfahrensschritten, die im kennzeichnenden Teil des Anspruchs 12 angegeben sind, innenverrippte Längsnahtrohre herzustellen, und zwar ebenfalls wirtschaftlich mit guten Oberflächenqualitäten in einem kontinuierlichen bzw. teilkontinuierlichen Prozeß.Alternatively, it is also conceivable, after the method steps according to the invention, that are specified in the characterizing part of claim 12, internally ribbed Manufacture longitudinal seam pipes, and also economically with good ones Surface qualities in a continuous or semi-continuous process.

Das erfindungsgemäße Verfahren ist vorteilhaft, weil es in einem kontinuierlichen Verfahrensablauf wirtschaftlich in der Lage ist, geschweißte Kupferrohre und Rohre aus Kupferlegierungen in niedriger bis hoher Kapazität (10.000 bis 100.000 t/a) herzustellen, bei innenverrippten Rohren sogar bis hinunter zu 1000 t/a und weniger. Die kontinuierliche Verfahrensabfolge unter Einsatz von Gießmaschinen mit sehr hohen Gießgeschwindigkeiten ermöglicht einerseits die hohe Kapazität, ohne andererseits die Qualität der Rohre negativ zu beeinflussen. Die Oberfläche des gegossenen Bandes entspricht trotz Fehlens des beim bekannten Stand der Technik vorgesehenen Fräsens der Bandoberfläche den Bedingungen für Präzisionskaltbänder für die Rohrherstellung. Die sich beim Warmwalzen einstellende Korngröße von 30 bis 40 µm ermöglicht günstigere Voraussetzungen beim Einformen der Bänder zu Schweißrohren, als dies bei weichem (geglühtem) Material bislang möglich war. Mit dem erfindungsgemäßen Verfahren wird erstmals ein in der Praxis brauchbares Verfahren zum Herstellen geschweißter Ne-Metallrohre geschaffen, das infolge seiner hohen Kapazität, seiner Flexibilität und seinen niedrigen Kosten die beim Stand der Technik beschriebenen Nachteile nicht aufweist.The inventive method is advantageous because it is in a continuous Process flow is economically capable of welding copper pipes and tubes made of copper alloys in low to high capacity (10,000 to 100,000 t / a) to manufacture, with internally finned pipes even down to 1000 t / a and less. The continuous process sequence using casting machines with very high casting speeds on the one hand enables the high capacity without on the other hand negatively affect the quality of the pipes. The surface of the cast tape corresponds despite the absence of that in the known prior art intended milling of the belt surface the conditions for Precision cold strips for pipe production. The one that arises during hot rolling Grain sizes from 30 to 40 µm enable more favorable conditions for molding of the strips into welding tubes than was previously the case with soft (annealed) material was possible. The method according to the invention is used for the first time in practice created a useful method for producing welded non-ferrous metal pipes, the due to its high capacity, flexibility and low cost the does not have the disadvantages described in the prior art.

Claims (13)

  1. Method for producing welded pipes from Cu and Cu alloys in a combined production line, comprising a casting installation for precursor material, a hot-rolling mill, a pipe shaping and welding section and a drawing device for the welded pipe, said method being characterised by the following sequence of steps:
    a. casting a virtually endless initial strip having dimensions in the range: width 45 to 200 mm, thickness 10 to 70 mm, on a casting machine at a high casting speed of up to 22 m/min,
    b. hot-rolling the cast initial strip at a rolling speed equal to casting speed x extension to form an intermediate strip having dimensions in the range: width 45 to 200 mm, thickness 2.0 to 14 mm,
    c. cooling the intermediate strip to ≤ 100°C to ambient temperature and descaling the surface of the intermediate strip,
    d. cold-rolling the intermediate strip to form a strip having dimensions in the range: width 45 to 200, thickness 0.9 to 6.3 mm,
    e. coiling the untrimmed strip to form coils of predetermined weights, steps a. to e. being carried out as an in-line process which is followed by the following additional operating steps:
    f. unwinding and shaping the strip to form a longitudinal seam pipe,
    g. welding the longitudinal seam immediately after trimming of the edges, to form a welded longitudinal seam pipe,
    h. externally and internally deburring the pipe,
    i. finishing to size, and finally
    j. drawing the welded pipe in at least one drawing stage to form the finished pipe.
  2. Method for producing welded pipes from Cu and Cu alloys according to claim 1,
    characterised in that
    the casting of the initial strip takes place on a strip-casting installation.
  3. Method for producing welded pipes from Cu and Cu alloys according to claim 1,
    characterised in that
    the casting of the initial strip takes place on a casting wheel.
  4. Method for producing welded pipes from Cu and Cu alloys according to claim 1 or 2,
    characterised in that
    the hot-rolling of the initial strip takes place at rolling temperatures of between 600 and 900°C to achieve grain sizes <40 µm.
  5. Method of producing welded pipes from Cu and Cu alloys according to one of claims 1 to 4,
    characterised in that
    the trimming of the intermediate strip takes place in the welding machine.
  6. Method for producing welded pipes from Cu and Cu alloys according to one of claims 1 to 5,
    characterised in that
    the hot strip is descaled by means of a chemical pickling process.
  7. Method according to claim 1,
    characterised in that
    method steps f. to j. take place after interim storage.
  8. Method according to claim 1,
    characterised in that
    method step j. takes place after interim storage.
  9. Method according to claim 1,
    characterised in that
    the final drawing step is dispensed with if the pipe produced by means of method steps a. to i. has already attained the finished dimensions.
  10. Method for producing welded pipes from Cu and Cu alloys according to claim 1,
    characterised in that
    to weld the longitudinal seam pipe, a known high-frequency, TIG or laser welding method is used which has the steps: uncoiling, straightening and butt-welding of the intermediate strip, shaping, welding, internal and external debarring if HF-welded, finishing to size, cutting to length, coiling and removal of the internal swarf.
  11. Method for producing welded pipes from Cu and Cu alloys according to claim 1,
    characterised in that
    to draw the longitudinal seam pipe, a known drawing method is used which has the steps: uncoiling, drawing on a bull block or continuous straight-line drawing, if necessary intermediate annealing, finish drawing and, if necessary, soft-annealing.
  12. Method for producing welded pipes from Cu and Cu alloys in a combined production line, comprising a casting installation for precursor material, a hot-rolling mill, a pipe shaping and welding section and a drawing device for the welded pipe, said method being characterised by the following sequence of steps:
    a. casting a virtually endless initial strip having dimensions in the range: width 45 to 200 mm; thickness 10 to 70 mm, on a casting machine at a high casting speed of up to 22 m/min,
    b. hot-rolling the cast initial strip at a rolling speed equal to casting speed x extension to form an intermediate strip having dimensions in the range: width 45 to 200, thickness 2.0 to 14 mm,
    c. cooling the intermediate strip to ≤ 100° to ambient temperature and descaling the surface of the intermediate strip,
    d. cold-rolling the intermediate strip to form a strip having dimensions in the range: width 45 to 200 mm, thickness < 0.9 mm,
    e. coiling the untrimmed strip to form coils of predetermined weights, steps a. to e. being carried out as an in-line process which is followed by the following additional operating steps:
    f. unwinding,
    g. ribbing the strip,
    h. shaping, welding and finishing to size the ribbed strip to form an internally ribbed longitudinal seam pipe in its finished dimensions.
  13. Method according to claim 12,
    characterised in that
    method steps f. to h. take place after interim storage.
EP98943664A 1997-08-06 1998-07-01 METHOD FOR PRODUCING WELDED Cu AND Cu ALLOY PIPES Expired - Lifetime EP1001856B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19734780 1997-08-06
DE19734780A DE19734780C1 (en) 1997-08-06 1997-08-06 Method for producing welded copper and copper alloy pipes
PCT/DE1998/001898 WO1999007491A1 (en) 1997-08-06 1998-07-01 METHOD FOR PRODUCING WELDED Cu AND Cu ALLOY PIPES

Publications (2)

Publication Number Publication Date
EP1001856A1 EP1001856A1 (en) 2000-05-24
EP1001856B1 true EP1001856B1 (en) 2002-11-27

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EP (1) EP1001856B1 (en)
JP (1) JP2001513443A (en)
KR (1) KR20010022528A (en)
CN (1) CN1100629C (en)
AT (1) ATE228403T1 (en)
AU (1) AU735019B2 (en)
CA (1) CA2299372C (en)
DE (2) DE19734780C1 (en)
ES (1) ES2183414T3 (en)
ID (1) ID24050A (en)
PL (1) PL187804B1 (en)
TW (1) TW369441B (en)
WO (1) WO1999007491A1 (en)

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Publication number Priority date Publication date Assignee Title
DE59906069D1 (en) * 1998-09-09 2003-07-31 Sms Demag Ag Process for the production of welded copper pipes
EP1777305B1 (en) * 2004-08-10 2010-09-22 Mitsubishi Shindoh Co., Ltd. Copper-base alloy casting with refined crystal grains
JP2006341276A (en) * 2005-06-09 2006-12-21 Jp Steel Plantech Co Method and facilities for continuous rolling
DE102005031805A1 (en) * 2005-07-07 2007-01-18 Sms Demag Ag Method and production line for producing metal strips of copper or copper alloys
JP4951517B2 (en) * 2005-09-30 2012-06-13 三菱伸銅株式会社 Melt-solidified product, copper alloy material for melt-solidification, and method for producing the same
DE102007022927A1 (en) * 2006-05-26 2007-12-20 Sms Demag Ag Apparatus and method for producing a metal strip by continuous casting
DE102007022931A1 (en) * 2006-05-26 2007-11-29 Sms Demag Ag Production of a metal strip used in a continuous casting process comprises using rolling and milling operations directly with casting of a slab in a casting machine
CN101737565B (en) * 2008-11-04 2011-12-28 肖玉佳 Method for manufacturing copper-aluminum composite tube
CN101767123A (en) * 2009-12-29 2010-07-07 大连通发新材料开发有限公司 Process and equipment for producing aluminum-cladding copper pipe
CN102000716B (en) * 2010-11-30 2013-05-08 大连三高科技发展有限公司 Production line of major diameter straight welded pipe
CN103591118B (en) * 2013-11-19 2015-12-02 无锡苏嘉法斯特汽车零配件有限公司 The manufacturing process of transmission shaft tube
CN104148437A (en) * 2014-06-29 2014-11-19 柳州美纳机械有限公司 Production method of double-metal composite pipe
CN106216956B (en) * 2016-08-18 2018-03-30 无锡苏嘉法斯特汽车零配件有限公司 The manufacture method of vehicle transmission central siphon
CN106216959B (en) * 2016-08-18 2018-03-30 无锡苏嘉法斯特汽车零配件有限公司 The manufacture method of automobile frame welded still pipe
CN106216957B (en) * 2016-08-18 2018-01-05 无锡苏嘉法斯特汽车零配件有限公司 The manufacture method of torsion beam of automobile welded still pipe
CN106216955B (en) * 2016-08-18 2018-01-23 无锡苏嘉法斯特汽车零配件有限公司 special steel transmission shaft tube manufacturing process
CN107188394B (en) * 2017-07-25 2019-12-10 成都光明派特贵金属有限公司 Glass discharge tube drawing die set, glass discharge tube manufacturing method and glass discharge tube
CN110681716A (en) * 2019-09-18 2020-01-14 东莞市竹菱铜业有限公司 Preparation method of beryllium bronze tube
CN114289544A (en) * 2021-12-31 2022-04-08 武汉市博钛新材料科技有限公司 Rapid reducing production device and process for high-frequency induction titanium welded pipe

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JPS60102224A (en) * 1983-11-09 1985-06-06 Hitachi Ltd Method and apparatus for continuous manufacturing of square pipe

Also Published As

Publication number Publication date
CA2299372A1 (en) 1999-02-18
TW369441B (en) 1999-09-11
ATE228403T1 (en) 2002-12-15
WO1999007491A1 (en) 1999-02-18
CN1100629C (en) 2003-02-05
JP2001513443A (en) 2001-09-04
EP1001856A1 (en) 2000-05-24
US6401323B1 (en) 2002-06-11
DE19734780C1 (en) 1998-12-10
PL338441A1 (en) 2000-11-06
ES2183414T3 (en) 2003-03-16
DE59806458D1 (en) 2003-01-09
AU9151898A (en) 1999-03-01
KR20010022528A (en) 2001-03-15
PL187804B1 (en) 2004-10-29
ID24050A (en) 2000-07-06
CA2299372C (en) 2006-06-27
CN1265612A (en) 2000-09-06
AU735019B2 (en) 2001-06-28

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