EP2170540B1 - Method for the production of hot-finished seamless pipes having optimized fatigue properties in the welded state - Google Patents

Method for the production of hot-finished seamless pipes having optimized fatigue properties in the welded state Download PDF

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Publication number
EP2170540B1
EP2170540B1 EP08773277A EP08773277A EP2170540B1 EP 2170540 B1 EP2170540 B1 EP 2170540B1 EP 08773277 A EP08773277 A EP 08773277A EP 08773277 A EP08773277 A EP 08773277A EP 2170540 B1 EP2170540 B1 EP 2170540B1
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pipe
region
produced
hot
transition
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German (de)
French (fr)
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EP2170540A1 (en
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Markus Ring
Gerd Kloster
Oliver Sommerkamp
Caroline Rott
Marion Erdelen-Peppler
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Vallourec Deutschland GmbH
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V&M Deutschland GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles

Definitions

  • the invention relates to a method for producing hot-finished seamless tubes with optimized fatigue properties in the welded state according to the preamble of claim 1.
  • Pipes produced by these methods are used, for example, in the oil or gas production technique, wherein the individual pipe sections are welded by a seam to a continuous strand.
  • the welded joint can cost and efficiently, for. B. by automated welding, and a high fatigue strength of the welded joint can be ensured. Even the most trouble-free media flow through the pipeline is also only guaranteed.
  • a disadvantage of this procedure is that an elaborate logistics for storage and transport of the tubes is required so that for the most trouble-free production process always the matching geometry from each other pipes are available.
  • Another disadvantage is the inflexibility in the production process in case of disturbances, eg. For example, when a pipe to be welded to a conduit pipe end is not available with the proper geometry.
  • the object of the invention is therefore to provide a method for producing hot-rolled seamless tubes, are produced with the tube ends of uniform and exact geometry, which allows efficient welding without a prior measurement and targeted allocation of the pipe ends and at the same time a high fatigue strength of the welded joint is reached.
  • a method is used to solve this problem, which is characterized in that in a first step at the pipe end in a region greater wall thickness is generated than the rest of the tubular body, wherein the wall thickening of the respective pipe end region by upsetting the Pipe end is generated, the transitions to the pipe body generated during upsetting on the outer and inner circumference are offset relative to the tube longitudinal axis and made in a second step in this area by machining the required pipe cross-section and the transition from machined to unprocessed area of the pipe paragraph sales , is provided with such a large radius or radius combinations, that there is a flowing and notch-free transition and the finished contour in the originally thickened end portion of the tube has an outer diameter corresponding to the original diameter of the tube ,
  • the pipe ends are now produced with a reproducible corresponding to the customer requirements geometry that allows welding together without prior measurement and assignment.
  • the logistic effort for storage and transport of the tubes is minimized, which leads to significant cost savings.
  • the wall thickening is chosen to be so large that the dimensional deviations due to the tube tolerances, in particular with regard to the roundness or ovality, can be almost completely compensated by the subsequent mechanical processing without falling below the nominal wall thickness.
  • the wall thickening may also be larger or smaller and extend over shorter or longer sections.
  • the wall thickening and its longitudinal extent should be limited to a necessary for the machining both for manufacturing reasons and for cost reasons.
  • the mechanical processing of the wall thickening can be done for example by unscrewing, with a very low ovality can also be achieved with very small diameter tolerances and very low surface roughness.
  • a centering ring projecting into the machined areas of the two pipe ends can be used prior to the welding of the tube ends in order to ensure optimum alignment of the tube ends for automated welding.
  • the wall thickening is produced by upsetting, in particular by hot upsetting of the pipe end.
  • the upsetting process is advantageously carried out so that the transitions to the tubular body generated during upsetting on the outer and inner circumference are arranged offset relative to the tube longitudinal axis.
  • Extensive investigations have shown that this staggered arrangement of the transitions in the tube longitudinal axis as well as the positioning of the radii in different tube cross-sectional planes during mechanical processing have a positive effect on the fatigue strength of the connection in the operating state.
  • These transitions are advantageously provided in the mechanical processing of the wall thickening with the largest possible radius or radii combinations. These ensure by their location in different cross-sectional planes adhering to a predetermined minimum wall thickness and lead to a possible fluid and notch-free transition to the non-thickened region of the tube. This advantageously ensures a low stress concentration factor in the transition zone.
  • FIG. 1 is a fragmentary longitudinal section of a pipe according to the invention produced with a wall thickening for Rohrau dry- and inside shown at the end of the pipe after upsetting.
  • the tube 1 has in the end region a wall thickening 3 produced in a hot forming step, which merges with a transition region 4, 4 'into the starting cross section 2 of the tube 1.
  • the wall thickening 3 is designed in this example so that the outer diameter of the tube 1 is increased and the inner diameter is reduced.
  • the upsetting process is carried out in such a way that the transition region 4 produced during upsetting on the outer circumference and the transition region 4 'produced on the inner circumference are offset with respect to the tube longitudinal axis relative to the tube longitudinal axis.
  • the transition region 4 produced by the compression process has on the outer circumference of the tube 1 paragraphs 5 and 6 and the transition region 4 'on the inner circumference paragraphs 7 and 8.
  • FIG. 2 shows the finished state of the end region of the tube 1 produced by mechanical processing.
  • the finished contour of the mechanically processed tube 1 has in the originally thickened end region of the tube 1 an outer diameter which corresponds to the original diameter of the tube 1.
  • the transition region 4 is provided with a large radius 9, which ensures a high degree of notch freedom through a flowing, paragraph-free transition together with a very low surface roughness in the machined area.
  • the inner circumference of the thickened tube end is not processed to the original inner diameter, but there remains a small wall thickening 11, starting from the transition region 4 'also with a large radius 10th is provided, which merges fluently and paragraph-free in the output cross section 2 of the tube 1.
  • the radii 9 and 10 are positioned in different tube cross-sectional planes, which has a positive effect on the fatigue strength of the connection in the operating state.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)
  • Heat Treatment Of Steel (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The invention relates to a method for the production of hot-finished, particularly hot-rolled, seamless pipes having optimized fatigue properties in the welded state, having an outside diameter of up to 711 mm and a nominal wall thickness of up to 100 mm, made of metal, in particular steel. After hot or finish rolling, a defined pipe cross-section is produced on at least one pipe end across a predetermined length, having tight tolerances for inside and outside diameters, wherein the cross-section can then be welded to the pipe end of another pipe. According to the invention, in a region a wall thickness is created in a first step at the pipe end in question, the thickness being bigger than on the remaining pipe body, wherein the outside diameter is increased and/or the inside diameter is reduced. In a second step, the required pipe cross-section is produced in said region by mechanical machining, and the transition from the machined to the unmachined region of the pipe is produced with low surface roughness and almost notch-free, and the residual wall thickness remaining in the machining region is within the required tolerances.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung warmgefertigter nahtloser Rohre mit optimierten Ermüdungseigenschaften im verschweißten Zustand gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a method for producing hot-finished seamless tubes with optimized fatigue properties in the welded state according to the preamble of claim 1.

Verschiedene Verfahren zur Herstellung nahtloser Rohre werden beispielsweise im Stahlrohr Handbuch (Vulkan-Verlag, Essen, 12. Auflage 1995, S. 97 - 101 ) beschrieben.Various processes for producing seamless pipes are used, for example, in Steel tube manual (Vulkan-Verlag, Essen, 12th edition 1995, p. 97 - 101 ).

Auch aus der gattungsgemäßen DE 10.2004 059 091 A1 ist ein Verfahren zur Herstellung von warmgefertigten nahtlosen Rohren bekannt, wobei in einem ersten Schritt am Rohrende bei gleichem Außendurchmesser eine größere Wanddicke erzeugt wird, die dann in einem zweiten Schritt mechanisch auf einen nahezu kreisrunden Innenumfang mit definierten Innendurchmesser abgearbeitet wird.Also from the generic DE 10.2004 059 091 A1 a method for the production of hot-finished seamless tubes is known, wherein in a first step at the tube end with the same outer diameter, a larger wall thickness is generated, which is then processed mechanically in a second step to a nearly circular inner circumference with a defined inner diameter.

Nach diesen Verfahren erzeugte Rohre werden beispielsweise in der Öl- oder Gasfördertechnik verwendet, wobei die einzelnen Rohrabschnitte durch eine Verbindungsnaht zu einem Endlosstrang verschweißt werden.Pipes produced by these methods are used, for example, in the oil or gas production technique, wherein the individual pipe sections are welded by a seam to a continuous strand.

Bei der Herstellung der Rohrverbindung ist eine exakt zueinander passende Geometrie der zu verschweißenden Rohrenden mit engen Toleranzen eine unbedingte Voraussetzung, um eine hohe Ermüdungsfestigkeit der Schweißverbindung im Betriebszustand der Rohrleitung zu erreichen. Zur Vermeidung von geometrischen Kerben ist insbesondere darauf zu achten, dass kein Kantenversatz der zu verschweißenden Rohrenden entsteht.In the production of the pipe joint, a precisely matching geometry of the tube ends to be welded with close tolerances is an absolute prerequisite in order to achieve a high fatigue strength of the welded connection in the operating state of the pipeline. In order to avoid geometric notches, special care must be taken to ensure that there is no edge offset of the pipe ends to be welded.

Die exakte Geometrie und engen Toleranzen der zu verschweißenden Rohrenden sind nicht nur für die Erfüllung der hohen Anforderungen an die Ermüdungsfestigkeit wichtig sondern auch für die Herstellungskosten der Schweißverbindung.The exact geometry and tight tolerances of the tube ends to be welded are important not only for meeting the high demands on fatigue strength but also for the manufacturing cost of the welded joint.

Nur wenn eine exakte Fluchtung der zu verschweißenden Rohrenden in engen Toleranzen realisiert wird, kann die Schweißverbindung kostengünstig und effizient, z. B. durch automatisiertes Schweißen, hergestellt und eine hohe Ermüdungsfestigkeit der Schweißverbindung sichergestellt werden. Auch ein möglichst störungsfreier Medienfluss durch die Rohrleitung ist ebenfalls nur dann gewährleistet.Only if an exact alignment of the pipe ends to be welded is realized in close tolerances, the welded joint can cost and efficiently, for. B. by automated welding, and a high fatigue strength of the welded joint can be ensured. Even the most trouble-free media flow through the pipeline is also only guaranteed.

Herstellungsbedingt können die Toleranzen warmgewalzter nahtloser Rohre aber nicht sicher in einem für eine effiziente Herstellung der Verbindungsschweißung erforderlichen engen Rahmen gehalten werden. Hinzu kommt, dass geringfügige Wanddickenschwankungen und Ovalitäten beim Rohrdurchmesser auftreten.However, due to manufacturing constraints, the hot rolled seamless tube tolerances can not be safely maintained within a narrow frame required for efficient production of the joint weld. In addition, slight wall thickness fluctuations and ovalities in the pipe diameter occur.

Dies macht es erforderlich, die zu verschweißenden Enden von Rohren entsprechend ihrer Geometrie auszuwählen und zuzuordnen. Für diese gezielte Zuordnung ist deshalb bislang eine entsprechende Vermessung der Rohrenden unverzichtbar.This makes it necessary to select and assign the ends of pipes to be welded according to their geometry. Therefore, a corresponding measurement of the pipe ends is indispensable for this specific assignment so far.

Aus der WO 2005/031249 ist eine Vorrichtung bekannt, die die innere und äußere Geometrie von Rohrenden vermisst und so eine gezielte Auswahl von zueinander exakt passenden Rohrenden ermöglicht.From the WO 2005/031249 a device is known which measures the inner and outer geometry of pipe ends and thus allows a targeted selection of mutually exactly matching pipe ends.

Nachteilig bei dieser Verfahrensweise ist, dass eine aufwändige Logistik für Lagerung und Transport der Rohre erforderlich ist, damit für einen möglichst störungsfreien Fertigungsablauf immer die von der Geometrie her zueinander passenden Rohre zur Verfügung stehen. Ein weiterer Nachteil ist die Unflexibilität im Fertigungsablauf bei auftretenden Störungen, z. B. wenn ein an ein Leitungsrohrende anzuschweißendes Rohr nicht mit der passenden Geometrie zur Verfügung steht.A disadvantage of this procedure is that an elaborate logistics for storage and transport of the tubes is required so that for the most trouble-free production process always the matching geometry from each other pipes are available. Another disadvantage is the inflexibility in the production process in case of disturbances, eg. For example, when a pipe to be welded to a conduit pipe end is not available with the proper geometry.

Aufgabe der Erfindung ist es deshalb, ein Verfahren zur Herstellung warmgewalzter nahtloser Rohre anzugeben, mit dem Rohrenden von gleichmäßiger und exakter Geometrie erzeugt werden, die ein effizientes Verschweißen ohne eine vorherige Vermessung und gezielte Zuordnung der Rohrenden ermöglicht und mit dem gleichzeitig eine hohe Ermüdungsfestigkeit der Schweißverbindung erreicht wird.The object of the invention is therefore to provide a method for producing hot-rolled seamless tubes, are produced with the tube ends of uniform and exact geometry, which allows efficient welding without a prior measurement and targeted allocation of the pipe ends and at the same time a high fatigue strength of the welded joint is reached.

Diese Aufgabe wird nach dem Oberbegriff in Verbindung mit den kennzeichnenden Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen sind Gegenstand von Unteransprüchen.This object is achieved according to the preamble in conjunction with the characterizing features of claim 1. Advantageous developments are the subject of dependent claims.

Nach der Lehre der Erfindung wird zur Lösung dieser Aufgabe ein Verfahren verwendet, welches dadurch gekennzeichnet ist, dass in einem ersten Schritt am betreffenden Rohrende in einem Bereich eine größere Wanddicke erzeugt wird als am übrigen Rohrkörper, wobei die Wandverdickung des betreffenden Rohrendenbereiches durch ein Stauchen des Rohrendes erzeugt wird, wobei die beim Stauchen am Außen- und Innenumfang erzeugten Übergänge zum Rohrkörper bezogen auf die Rohrlängsachse versetzt angeordnet sind und in einem zweiten Schritt in diesem Bereich durch mechanische Bearbeitung der geforderte Rohrquerschnitt hergestellt und der Übergang vom bearbeiteten zum unbearbeiteten Bereich des Rohres absatzfrei, mit einem so großen Radius oder Radiuskombinationen versehen wird, dass sich ein fließender und kerbfreier Übergang ergibt und die Fertigkontur im ursprünglich verdickten Endbereich des Rohres einen Außendurchmesser aufweist, der dem Ursprungsdurchmesser des Rohres entspricht.According to the teachings of the invention, a method is used to solve this problem, which is characterized in that in a first step at the pipe end in a region greater wall thickness is generated than the rest of the tubular body, wherein the wall thickening of the respective pipe end region by upsetting the Pipe end is generated, the transitions to the pipe body generated during upsetting on the outer and inner circumference are offset relative to the tube longitudinal axis and made in a second step in this area by machining the required pipe cross-section and the transition from machined to unprocessed area of the pipe paragraph sales , is provided with such a large radius or radius combinations, that there is a flowing and notch-free transition and the finished contour in the originally thickened end portion of the tube has an outer diameter corresponding to the original diameter of the tube ,

Vorteil des erfindungsgemäßen Verfahrens ist, dass die Rohrenden jetzt mit einer reproduzierbaren den Kundenanforderungen entsprechenden Geometrie erzeugt werden, die ein Aneinanderschweißen ohne vorherige Vermessung und Zuordnung ermöglicht. Der logistische Aufwand für Lagerung und Transport der Rohre wird minimiert, was zu erheblichen Kosteneinsparungen führt.Advantage of the method according to the invention is that the pipe ends are now produced with a reproducible corresponding to the customer requirements geometry that allows welding together without prior measurement and assignment. The logistic effort for storage and transport of the tubes is minimized, which leads to significant cost savings.

Gleichzeitig werden durch die mechanische Bearbeitung die Toleranzen der Rohrendengeometrie in sehr engen Grenzen gehalten, was zu optimalen Schweißbedingungen führt und eine effiziente Herstellung der Rohrverbindung, z. B. durch automatisierte Schweißverfahren, ermöglicht. Zudem wird eine hohe Ermüdungsfestigkeit der Rohrverbindung aufgrund weitgehender Kerbfreiheit durch geringe Oberflächenrauhigkeit gewährleistet.At the same time the tolerances of the pipe end geometry are kept within very narrow limits by the mechanical processing, which leads to optimal welding conditions and efficient production of the pipe joint, for. B. by automated welding process enabled. In addition, a high fatigue strength of the pipe joint is ensured due to extensive notch freedom by low surface roughness.

Günstig für einen störungsarmen Medienfluss im späteren Verbindungsbereich des Rohres ist in Rohrlängsrichtung ein absatzfreier Übergang vom verdickten Rohrende zum nicht verdickten Rohrbereich. Erfindungsgemäß wird dazu am Übergang vom bearbeiteten zum nicht bearbeiteten Rohrende ein möglichst großer Radius bzw. Radien vorgesehen.Favorable for a low-interference media flow in the later connection region of the pipe is a paragraph-free transition from the thickened pipe end to the non-thickened pipe region in the pipe longitudinal direction. According to the invention, the largest possible radius or radii is provided at the transition from the machined to unprocessed pipe end.

Vorteilhaft wird die Wandverdickung so groß gewählt, dass die aufgrund der Rohrtoleranzen vorhandenen Maßabweichungen, insbesondere bezüglich der Rundheit bzw. Ovalität, durch die nachfolgende mechanische Bearbeitung ohne Unterschreitung der Nennwanddicke nahezu vollständig ausgeglichen werden können.Advantageously, the wall thickening is chosen to be so large that the dimensional deviations due to the tube tolerances, in particular with regard to the roundness or ovality, can be almost completely compensated by the subsequent mechanical processing without falling below the nominal wall thickness.

Zur Sicherstellung eines ausreichenden Bearbeitungsspielraumes hat es sich deshalb als günstig herausgestellt, eine Wandverdickung von mindestens 3 mm zur Rohraußenseite und/oder zur Rohrinnenseite auf einer Länge von mindestens 100 mm, ausgehend von der Stirnseite des Rohres, vorzusehen.To ensure a sufficient processing latitude, it has therefore been found to be favorable to provide a wall thickening of at least 3 mm to the outside of the pipe and / or the pipe inside over a length of at least 100 mm, starting from the end face of the tube.

Bei Bedarf kann die Wandverdickung jedoch auch größer oder kleiner sein und sich über kürzere oder längere Abschnitte erstrecken.If necessary, however, the wall thickening may also be larger or smaller and extend over shorter or longer sections.

Andererseits sollte die Wandverdickung und deren Längserstreckung sowohl aus fertigungstechnischen wie auch aus Kostengründen auf ein für die Bearbeitung notwendiges Maß beschränkt werden.On the other hand, the wall thickening and its longitudinal extent should be limited to a necessary for the machining both for manufacturing reasons and for cost reasons.

Die mechanische Bearbeitung der Wandverdickung kann beispielsweise durch Ausdrehen erfolgen, wobei eine sehr geringe Ovalität bei ebenfalls sehr geringen Durchmessertoleranzen und sehr geringer Oberflächenrauhigkeit erreicht werden kann.The mechanical processing of the wall thickening can be done for example by unscrewing, with a very low ovality can also be achieved with very small diameter tolerances and very low surface roughness.

Als vorteilhaft hat sich zur Sicherstellung einer qualitativ einwandfreien Verschweißung der Rohrenden eine Bearbeitungslänge ausgehend von der Stirnseite des Rohres von mindestens 100 mm bewährt.It has proven to be advantageous to ensure a qualitatively perfect welding of the pipe ends a machining length starting from the end face of the tube of at least 100 mm.

Im Bedarfsfall kann vor der Verschweißung der Rohrenden ein in die bearbeiteten Bereiche der beiden Rohrenden hinein ragender Zentrierring eingesetzt werden, um ein optimales Fluchten der Rohrenden für eine automatisierte Schweißung zu gewährleisten.If necessary, a centering ring projecting into the machined areas of the two pipe ends can be used prior to the welding of the tube ends in order to ensure optimum alignment of the tube ends for automated welding.

Erfindungsgemäß wird die Wandverdickung durch ein Aufstauchen, insbesondere durch Warmstauchen des Rohrendes erzeugt.According to the invention, the wall thickening is produced by upsetting, in particular by hot upsetting of the pipe end.

Der Stauchvorgang wird dabei vorteilhaft so ausgeführt, dass die beim Stauchen am Außen-und Innenumfang erzeugten Übergänge zum Rohrkörper bezogen auf die Rohrlängsachse versetzt angeordnet sind. Umfangreiche Untersuchungen haben gezeigt, dass sich diese versetzte Anordnung der Übergänge in der Rohrlängsachse sowie die Positionierung der Radien in unterschiedlichen Rohrquerschnittsebenen bei der mechanischen Bearbeitung positiv auf die Ermüdungsfestigkeit der Verbindung im Betriebszustand auswirken. Vorteilhaft werden dazu diese Übergänge bei der mechanischen Bearbeitung der Wandverdickung mit einem möglichst großen Radius oder Radienkombinationen versehen. Diese gewährleisten durch ihre Lage in unterschiedlichen Querschnittsebenen das Einhalten einer vorgegebenen minimalen Wandstärke und führen zu einem möglichst fließenden und kerbfreien Übergang zum nicht verdickten Bereich des Rohres. Hierdurch wird vorteilhaft in der Übergangszone ein niedriger Spannungskonzentrationsfaktor gewährleistet.The upsetting process is advantageously carried out so that the transitions to the tubular body generated during upsetting on the outer and inner circumference are arranged offset relative to the tube longitudinal axis. Extensive investigations have shown that this staggered arrangement of the transitions in the tube longitudinal axis as well as the positioning of the radii in different tube cross-sectional planes during mechanical processing have a positive effect on the fatigue strength of the connection in the operating state. These transitions are advantageously provided in the mechanical processing of the wall thickening with the largest possible radius or radii combinations. These ensure by their location in different cross-sectional planes adhering to a predetermined minimum wall thickness and lead to a possible fluid and notch-free transition to the non-thickened region of the tube. This advantageously ensures a low stress concentration factor in the transition zone.

Bei dem vorgenannten Verfahren wird die Erzeugung der Wandverdickung vollständig vom Walzprozess abgekoppelt was den Vorteil hat, dass Rohre, z. B. Lagerrohre, die ursprünglich nicht für den beschriebenen Einsatzzweck vorgesehen waren, nachträglich mit einer Wandverdickung und einer entsprechenden mechanischen Bearbeitung versehen werden können.In the aforementioned method, the production of wall thickening is completely decoupled from the rolling process which has the advantage that pipes, z. B. bearing tubes, which were not originally intended for the application described, can be subsequently provided with a wall thickening and a corresponding mechanical processing.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung der dargestellten Ausführungsbeispiele.Further features, advantages and details of the invention will become apparent from the following description of the illustrated embodiments.

Es zeigen:

Figur 1
eine durch Aufstauchen erzeugte Wandverdickung an einem Rohrende,
Figur 2
eine erfindungsgemäße Rohrendenausbildung im bearbeiteten Zustand.
Show it:
FIG. 1
a wall thickening produced by upsetting at a pipe end,
FIG. 2
a pipe end formation according to the invention in the processed state.

In Figur 1 ist ausschnittsweise im Längsschnitt ein erfindungsgemäß erzeugtes Rohr mit einer Wandverdickung zur Rohraußen- und -innenseite am Rohrende nach dem Aufstauchen dargestellt.In FIG. 1 is a fragmentary longitudinal section of a pipe according to the invention produced with a wall thickening for Rohraußen- and inside shown at the end of the pipe after upsetting.

Das Rohr 1 weist im Endbereich eine in einem Warmumformschritt erzeugte Wandverdickung 3 auf, die mit einem Übergangsbereich 4, 4' in den Ausgangsquerschnitt 2 des Rohres 1 übergeht.The tube 1 has in the end region a wall thickening 3 produced in a hot forming step, which merges with a transition region 4, 4 'into the starting cross section 2 of the tube 1.

Die Wandverdickung 3 ist in diesem Beispiel so ausgeführt, dass der Außendurchmesser des Rohres 1 vergrößert und der Innendurchmesser verkleinert ist.The wall thickening 3 is designed in this example so that the outer diameter of the tube 1 is increased and the inner diameter is reduced.

Erfindungsgemäß wird der Stauchvorgang dabei so ausgeführt, dass der beim Stauchen am Außenumfang erzeugte Übergangsbereich 4 und der am Innenumfang erzeugte Übergangsbereich 4' zum Rohrkörper bezogen auf die Rohrlängsachse versetzt angeordnet sind.According to the invention, the upsetting process is carried out in such a way that the transition region 4 produced during upsetting on the outer circumference and the transition region 4 'produced on the inner circumference are offset with respect to the tube longitudinal axis relative to the tube longitudinal axis.

Der durch den Stauchvorgang erzeugte Übergangsbereich 4 weist am Außenumfang des Rohres 1 Absätze 5 und 6 und der Übergangsbereich 4' am Innenumfang Absätze 7 und 8 auf.The transition region 4 produced by the compression process has on the outer circumference of the tube 1 paragraphs 5 and 6 and the transition region 4 'on the inner circumference paragraphs 7 and 8.

Figur 2 zeigt den durch mechanische Bearbeitung hergestellten Fertigzustand des Endbereiches des Rohres 1. FIG. 2 shows the finished state of the end region of the tube 1 produced by mechanical processing.

Die Fertigkontur des mechanisch bearbeiteten Rohres 1 weist im ursprünglich verdickten Endbereich des Rohres 1 einen Außendurchmesser auf, der dem Ursprungsdurchmesser des Rohres 1 entspricht. Der Übergangsbereich 4 ist mit einem großen Radius 9 versehen, der durch einen fließenden, absatzfreien Übergang zusammen mit einer sehr geringen Oberflächenrauhigkeit im bearbeiteten Bereich, eine weitgehende Kerbfreiheit gewährleistet.The finished contour of the mechanically processed tube 1 has in the originally thickened end region of the tube 1 an outer diameter which corresponds to the original diameter of the tube 1. The transition region 4 is provided with a large radius 9, which ensures a high degree of notch freedom through a flowing, paragraph-free transition together with a very low surface roughness in the machined area.

Um die geforderte Mindestwanddicke des Rohres 1 im Bereich des Übergangsbereiches 4 nicht zu unterschreiten, ist der Innenumfang des verdickten Rohrendes nicht bis auf den Ursprungsinnendurchmesser abgearbeitet, sondern es verbleibt eine geringe Wandverdickung 11, von der ausgehend der Übergangsbereich 4' ebenfalls mit einem großen Radius 10 versehen ist, der fließend und absatzfrei in den Ausgangsquerschnitt 2 des Rohres 1 übergeht.In order not to fall below the required minimum wall thickness of the tube 1 in the region of the transition region 4, the inner circumference of the thickened tube end is not processed to the original inner diameter, but there remains a small wall thickening 11, starting from the transition region 4 'also with a large radius 10th is provided, which merges fluently and paragraph-free in the output cross section 2 of the tube 1.

Erfindungsgemäß sind die Radien 9 und10 in unterschiedlichen Rohrquerschnittsebenen positioniert, was sich positiv auf die Ermüdungsfestigkeit der Verbindung im Betriebszustand auswirkt.According to the invention, the radii 9 and 10 are positioned in different tube cross-sectional planes, which has a positive effect on the fatigue strength of the connection in the operating state.

Durch diese Anordnung ist einerseits gewährleistet, dass die geforderte Mindestwanddicke nicht unterschritten wird, andererseits kann nur auf diese Weise ein möglichst kerbfreier Übergang 4' zum Ausgangsquerschnitt 2 des Rohres 1 realisiert werden.By this arrangement, on the one hand ensures that the required minimum wall thickness is not exceeded, on the other hand, a possible notch-free transition 4 'to the output cross section 2 of the tube 1 can be realized only in this way.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

Nr.No. Bezeichnungdescription 11 Rohrpipe 22 AusgangsquerschnittOutput section 33 Wandverdickungwall thickening 4, 4'4, 4 ' ÜbergangsbereichTransition area 5,65.6 Absatz Übergangsbereich außenParagraph transition area outside 7, 87, 8 Absatz Übergangsbereich innenParagraph transition area inside 99 Radius Übergangsbereich außenRadius transition area outside 1010 Radius Übergangsbereich innenRadius transition area inside 1111 Wandverdickung RohrinnenseiteWall thickening inside pipe

Claims (6)

  1. A method for producing hot-manufactured, in particular hot-rolled, seamless pipes with optimised fatigue properties in the welded state with an external diameter of up to 711 mm and a nominal wall thickness of up to 100 mm from metal, in particular steel, wherein after the hot-rolling or finish-rolling a defined pipe cross-section provided with narrow tolerances for internal and external diameters is produced at least at one pipe end over a fixed length, characterised in that
    in a first step, a greater wall thickness is produced on the pipe end in question in one region than on the rest of the pipe body (1), the wall thickening of the pipe end region in question being produced by upsetting the pipe end, the transitions (4; 5, 6; 7, 8) to the pipe body (1) which are produced on the external and internal periphery upon upsetting being arranged offset relative to the longitudinal pipe axis, and in a second step the required pipe cross-section is produced in this region by machining and the transition (4) from the machined to the non-machined region of the pipe is provided step-free, with such a large radius (9, 10) or radius combinations that a flowing, notch-free transition is yielded and the finished contour in the originally thickened end region of the pipe (1) has an external diameter which corresponds to the original diameter of the pipe.
  2. A method according to Claim 1, characterised in that the upsetting is hot upsetting.
  3. A method according to one of Claims 1 - 2, characterised in that the wall thickening (3) is at least 3 mm.
  4. A method according to one of Claims 1 - 3, characterised in that the wall thickening (3) extends in the longitudinal direction of the pipe over a length of at least 100 mm, starting from the end face.
  5. A method according to one of Claims 1 - 4, characterised in that a step-free transition (4) from the thickened pipe end to the non-thickened pipe region is produced in the longitudinal direction of the pipe on the external and/or internal periphery.
  6. A method according to Claim 5, characterised in that the transition (4) is provided on the external and internal diameter with at least one radius in each case which lies in different cross-sectional planes.
EP08773277A 2007-07-24 2008-06-26 Method for the production of hot-finished seamless pipes having optimized fatigue properties in the welded state Active EP2170540B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007034895A DE102007034895A1 (en) 2007-07-24 2007-07-24 Method of producing hot-finished seamless tubes with optimized fatigue properties in the welded state
PCT/DE2008/001064 WO2009012744A1 (en) 2007-07-24 2008-06-26 Method for the production of hot-finished seamless pipes having optimized fatigue properties in the welded state

Publications (2)

Publication Number Publication Date
EP2170540A1 EP2170540A1 (en) 2010-04-07
EP2170540B1 true EP2170540B1 (en) 2012-08-08

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EP08773277A Active EP2170540B1 (en) 2007-07-24 2008-06-26 Method for the production of hot-finished seamless pipes having optimized fatigue properties in the welded state

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US (1) US9718116B2 (en)
EP (1) EP2170540B1 (en)
JP (1) JP5165757B2 (en)
KR (1) KR101499631B1 (en)
CN (1) CN101827666B (en)
AR (1) AR067641A1 (en)
AU (1) AU2008280642B2 (en)
BR (1) BRPI0814347B1 (en)
CA (1) CA2694469C (en)
DE (1) DE102007034895A1 (en)
EA (1) EA015222B1 (en)
MX (1) MX2010000815A (en)
UA (1) UA96827C2 (en)
WO (1) WO2009012744A1 (en)

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DE102014102452A1 (en) 2014-02-25 2015-08-27 Vallourec Deutschland Gmbh Process for the production of hot rolled, seamless tubes of transformable steel, in particular for pipelines for deep water applications and related pipes
DE102014110980A1 (en) 2014-08-01 2016-02-04 Vallourec Deutschland Gmbh Method for producing hot-rolled seamless tubes with thickened ends
DE102014216674A1 (en) * 2014-08-21 2016-02-25 Schaeffler Technologies AG & Co. KG Tubular component and method for its production

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GB2489729B (en) * 2011-04-07 2013-09-18 Rolls Royce Plc Hollow shaft

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DE102014110980A1 (en) 2014-08-01 2016-02-04 Vallourec Deutschland Gmbh Method for producing hot-rolled seamless tubes with thickened ends
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DE102014216674A1 (en) * 2014-08-21 2016-02-25 Schaeffler Technologies AG & Co. KG Tubular component and method for its production

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WO2009012744A1 (en) 2009-01-29
KR101499631B1 (en) 2015-03-06
CN101827666B (en) 2012-12-26
MX2010000815A (en) 2010-03-01
AU2008280642A1 (en) 2009-01-29
BRPI0814347B1 (en) 2020-10-13
US20100326557A1 (en) 2010-12-30
CA2694469A1 (en) 2009-01-29
JP5165757B2 (en) 2013-03-21
AU2008280642B2 (en) 2014-04-10
CN101827666A (en) 2010-09-08
EA201000234A1 (en) 2010-06-30
EP2170540A1 (en) 2010-04-07
UA96827C2 (en) 2011-12-12
US9718116B2 (en) 2017-08-01
AR067641A1 (en) 2009-10-21
JP2010534136A (en) 2010-11-04
KR20100039351A (en) 2010-04-15
AU2008280642A2 (en) 2010-05-27
DE102007034895A1 (en) 2009-01-29
BRPI0814347A2 (en) 2015-01-27
EA015222B1 (en) 2011-06-30
CA2694469C (en) 2015-11-24

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