EP3110980A1 - Procédé de fabrication de tubes laminés à chaud sans cordon en acier transformable, notamment pour des conduites tubulaires destinées à des applications en eau profonde, et tubes correspondants - Google Patents

Procédé de fabrication de tubes laminés à chaud sans cordon en acier transformable, notamment pour des conduites tubulaires destinées à des applications en eau profonde, et tubes correspondants

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Publication number
EP3110980A1
EP3110980A1 EP15708140.7A EP15708140A EP3110980A1 EP 3110980 A1 EP3110980 A1 EP 3110980A1 EP 15708140 A EP15708140 A EP 15708140A EP 3110980 A1 EP3110980 A1 EP 3110980A1
Authority
EP
European Patent Office
Prior art keywords
max
pipe
tube
strength
wall thickness
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.)
Withdrawn
Application number
EP15708140.7A
Other languages
German (de)
English (en)
Inventor
Tanja Schmidt
Ferid Gercekoglu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vallourec Deutschland GmbH
Original Assignee
Vallourec Deutschland GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vallourec Deutschland GmbH filed Critical Vallourec Deutschland GmbH
Publication of EP3110980A1 publication Critical patent/EP3110980A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • C21D9/085—Cooling or quenching
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • 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
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/613—Gases; Liquefied or solidified normally gaseous material
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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
    • C21D9/14—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes wear-resistant or pressure-resistant pipes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2221/00—Treating localised areas of an article
    • C21D2221/01—End parts (e.g. leading, trailing end)

Definitions

  • the invention relates to a method for the production of hot-rolled, seamless tubes of transformable steel, in particular for pipelines for
  • Pipe ends are heaved to achieve a wall thickening. Furthermore, the invention relates to a seamless tube made of a convertible steel with a minimum yield strength of 415 MPa produced by hot rolling, then hot upsetting the pipe ends to produce a
  • the invention relates to pipes produced by the aforementioned method, which are welded together at their pipe ends to produce pipes. It is well known piping in which individual pipes through a
  • the individual tubes are welded together on a laying vessel or on land to form an endless tube and then laid on the seabed.
  • the pipes and welded joints are very high mechanical
  • the pipeline is in addition to, for example, by ocean currents dynamic, and by high fluid temperature of up to 220 ° C, by high pressure of the medium to be pumped up to 150 MPa and / or by high
  • Corrosivity of the acidic medium to be transported e.g. Carbonic acid, hydrogen sulfide or oxygen claimed.
  • Pipe diameter occur. This makes it necessary to select and assign the ends of pipes to be welded according to their geometry. For this reason, a specific measurement of the pipe ends was indispensable until now.
  • the patent EP 2 170 540 B1 discloses a method for the production of hot-finished seamless pipes, which produces pipes with optimized fatigue properties in the welded state and can also be welded automatically on a laying vessel or ashore without targeted selection and assignment.
  • Warm upsetting and mechanical processing are generated, for example, from the published patent application DE 10 2004 059 091 A1 and the patent EP 0 756 682 B1 known.
  • Corrosion susceptibility especially in the weld at the thickened pipe end, especially in sour gas use tend.
  • the object of the invention is therefore to provide a process for the preparation of
  • Deep-water applications still have excellent laying properties, in order to meet the complex offshore requirements, even with large water depths of up to 5000 m, and still be economical to produce.
  • the tubes should be inexpensive to produce, consist of a high-strength material, have a high fatigue strength and good weldability and can be automated welded and laid.
  • This object is achieved by a method for producing hot-rolled, seamless tubes of convertible steel, in particular for pipelines for deep water applications, having the features of claim 1. Also, this object is achieved by a tube having the features of claim 17.
  • a pipe is achieved with a pipe end having a lower strength than the tubular body.
  • deep water is understood to mean water depths in the range from 1000 m to 5000 m, preferably up to 4000 m.
  • the finished pipe is subjected to a uniform tempering treatment after finishing, wherein based on previously determined wall thickness-dependent cooling rates, the tempering parameters are set such that the upset pipe ends are produced with a lower strength than the intermediate one in view of improved weldability
  • a pipe having a pipe end is achieved which, in addition to the lower strength, also has a lower hardness and a higher toughness than the pipe body.
  • the pipes are cleaned according to
  • the compensation treatment consists of a sequence of
  • Heating, quenching and tempering wherein the tube is heated when heated to a temperature above the austenitizing temperature.
  • the core idea of the proposed hitherto unusual tempering method is that a compensation of the entire pipe is done after upsetting and the compensation parameters depending on the ratio of the wall thickness of
  • Pipe ends are adjusted after finishing and the intermediate tubular body so that in the subsequent annealing due to the resulting different wall thickness-related cooling rates / - rates on the tubular body with the Cinwanddicke due to the different degrees of martensite formation during quenching a high material strength and upset the two Pipe ends with significantly greater wall thickness, a lower strength with excellent welding, fatigue and mechanical properties is generated.
  • this tempering treatment is carried out in such a way that, after heating to austenitizing temperature during subsequent hardening by quenching, preferably in water, the thickened pipe ends cool much more slowly compared to the pipe body therebetween and thus after tempering by the lower proportion of martensite in the structure have significantly lower strength, which has a very favorable effect on the weldability of the pipe ends, since the tendency to cold cracking during welding is significantly reduced.
  • a continuous, flowing microstructure transition between pipe ends and tubular body is advantageously achieved, which has a favorable effect on the state of stress and thus on the fatigue strength of the pipe or the pipe.
  • the thus produced and annealed tube is mechanically finished to the required final size. For example, if a high-strength material of API grade X80 for the
  • the tube ends with a lower strength, e.g. with a grade X65 produced, but the intermediate tubular body but still with the strength of an X80, which by means of a comparatively thin-walled but high-strength tubular body and thick-walled low-strength and easily weldable pipe ends, the deep-sea requirements are fully met.
  • hot dipping at the end of the pipe produces at least 1, 1, 1, 2, or 1, 3 times the wall thickness of the wall body of the tubular body.
  • at least twice the wall thickness of the wall thickness of the tubular body is produced by hot upsetting at the pipe end.
  • the specific compensation parameters to be set are based on previously determined cooling rates at different wall thicknesses depending on the ratio of Wall thickness of the tube ends to the wall thickness of the intermediate tubular body and the mechanical properties to be achieved defined, the cooling rate is set during quenching of the tube so that sets at the tube ends by a lower proportion of martensite in the structure significantly lower strength than the tubular body, the asked
  • a steel with the following
  • Pcm C + Si / 30 + (Mn + Cu + Cr) / 20 + Ni / 60 + Mo / 15 + V / 10 + 5 B
  • CE C + Mn / 6 + (Cr + Mo + V) / 5 + (Cu + Ni) / 15
  • Remaining iron including unavoidable steel-accompanying elements
  • a low carbon content of max. 0.18% and a CE carbon equivalent to IIW formula of max. 0.47% for C contents above 0.12% and a Pcm value of max. 0.22% for C contents less than or equal to 0.12% results in a final product which has excellent weldability with low cold cracking tendency.
  • micro-alloying elements niobium and / or vanadium and / or titanium may be added to the steel in amounts of up to Nb max. 0.09 wt.%, V max. 0.1 to 1 wt% and Ti to 0.04 wt% to increase strength and toughness by fine grain formation.
  • Pipe ends and pipe body adapted tempering treatment at the same time to ensure the very high deep sea requirements and excellent weldability of the pipe ends.
  • the alloy composition should therefore be particularly advantageously formed as follows (% by weight): C: 0.05 to 0.12
  • V 0.05 to 0.08
  • a restriction of chrome to max. 0.100 wt .-% additionally reduces the susceptibility of hot cracks in the heat affected zone in the welding of the pipe ends and thus contributes in addition to the lower strength and hardness of the quenched tube ends compared to the tube body to a good weldability.
  • a sufficient corrosion resistance of the pipeline, even in the promotion of highly corrosive media is ensured by an advantageous development of the invention, characterized in that the tube according to the invention before the
  • Welding to a pipe string is provided inside with a corrosion-inhibiting layer.
  • a corrosion-inhibiting layer This can for example be inserted into the output tube and thus material or non-positively connected stainless steel tube. It is also conceivable that the inner surface of the starting tube by means of thermal spraying or build-up welding provided with a corrosion-inhibiting layer becomes.
  • a paragraph-free transition from the thickened tube end to the non-thickened tube region in the tube longitudinal direction is a paragraph-free transition from the thickened tube end to the non-thickened tube region in the tube longitudinal direction.
  • the largest possible radius or radii are provided at the transition from the machined to the non-machined pipe end. Accordingly, in the tube longitudinal direction on the outer and / or inner circumference a paragraph and notch-free transition from the thickened tube end to the non-thickened tubular body generated.
  • the wall thickening is chosen so large that due to the
  • Pipe tolerances existing deviations, 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.
  • an upsetting can also take place, for example, by 60 mm or more.
  • Weld seam area of the pipe ends a thickening length starting from the end face of the pipe of at least 150 mm case by case also 300 mm and more proven.
  • the wall thickening but 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 wall thickening extends from the end face of the tube in the tube longitudinal direction to a length of at least 80 mm.
  • 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 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 tests 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 with radii combinations. These ensure by their location in different
  • Starting temperatures have proven to be values between 610 and 680 ° C, advantageously between 640 and 670 ° C, with holding times between 10 and 45 minutes. Cooling then takes place in still air.
  • the hot dipping of the pipe ends over a predetermined length in one or more upsetting and re-heating operations is favorable for the adjustment of the required material properties at the pipe ends and the pipe body have after the finish diving
  • a seamless tube of transformable steel having a minimum yield strength of 415 MPa is produced by hot rolling
  • this tube has excellent fatigue, corrosion and welding properties.
  • this seamless tube has a yield strength and a strength at the thickened tube ends of at least 5%, preferably at least 10%, below the corresponding values of the tube body.
  • this seamless tube has the above-described chemical compositions in wt .-%.
  • the tubes produced by the method according to the invention described above are used for the production of pipelines, wherein the tube ends of the tubes are welded directly to each other.
  • Pipe is to be understood in this context and in connection with the invention very comprehensive and includes both the individual tubes, as well as necessary for the production of a pipeline pipe components, such as pipe bends, branches, etc.
  • FIG. 1 shows a wall thickening produced by upsetting at a pipe end
  • FIG. 2 shows a pipe end formation according to the invention in the processed state
  • FIG. 3 shows a schematic representation of the dependence of the cooling speed on the pipe wall thickness during tempering of a pipe
  • FIG. 4 shows a table about investigated alloys
  • FIG. 5a shows a diagram of the hardness profile over the tube length
  • FIG. 5b shows a diagram of the hardness profile over the wall cross section at the pipe end
  • FIG. 6a shows a diagram of the strength over the pipe length
  • FIG. 6b shows a diagram of the strength at the pipe end
  • FIG. 7 a shows a graph of the yield ratio and the elongation over the tube length
  • Figure 7b is a graph of yield ratio and elongation at the pipe end
  • Figure 8a is a graph of notch energy over the pipe length
  • Figure 8b is a graph of notched impact energy at the pipe end.
  • a longitudinal section of a section between a tubular body 2 and a pipe end 3 shows a pipe 1 produced according to the invention with a wall thickening to the outside and inside of the pipe at at least one but preferably both pipe ends 3.
  • the tube 1 has at the tube end 3 in a hot forming step
  • 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 swaging operation has, on the outer circumference of the tube 1 with respect to the tube longitudinal axis, one behind the other and at a distance from each other arranged paragraphs 5 and 6 and the transition region 4 'on
  • FIG. 2 shows, after the tempering, the finished state of the pipe end 3 of the pipe 1 produced by mechanical processing.
  • the finished contour of the mechanically machined tube 1 has at the tube end 3 'of the tube 1 on a wall thickening, on the one hand meets the requirements of the load-bearing cross-section after the welding of the tubes 1, on the other hand, in view of improved weldability in the treatment by the slower cooling in this thickened region has a significantly lower strength than the tubular body 2.
  • the transition region 4 is provided with a large radius 9, which by a flowing, paragraph-free transition together with a very small
  • Transition region 4 is not to fall below, the inner circumference of the thickened pipe end is not processed to the original inner diameter, but it remains a small wall thickening 1 1, starting from the transition region 4 'is also provided with a large radius 10, the fluent and paragraph free in the Output cross section of the tube 1 in the region of the tubular body 2 passes.
  • the radii 9 and 10 are different
  • FIG. 3 schematically shows the dependence of the cooling rate V H on the wall thickness W of the tube 1 in the hardening of a tube 1 according to the invention.
  • a pipe 1 of an X80 grade with a starting wall thickness of 28.4 mm was pushed up to 57.4 mm and then tempered.
  • the tubes of a tempering treatment according to the invention were subjected to heating to Austenitmaschinestemperatur and subsequent quenching in water.
  • the cooling rate of the tubular body 2 and the upset pipe ends. 3 results in wall thickness-dependent, wherein the tubular body 2 due to the thinner wall undergoes a higher cooling rate than the thickened pipe ends.
  • the microstructure according to the ZTU diagram is predominantly bainitic, with electron microscopy
  • FIG. 4 shows in tabular form the examined alloys.
  • the alloy composition of Steel 1 differs mainly from Steel 2 in lowered elemental contents of carbon, manganese, aluminum, chromium, titanium and niobium to realize different strength classes of the parent pipe.
  • the contents of copper, nickel and molybdenum were in the ranges 0.15 to 0.25 wt .-% for copper, 0.15 to 0.35 wt .-% for nickel and 0.08 to 0.35 wt. % for molybdenum, with steel 1 each having lower levels of these elements.
  • the tubes 1 were first uniformly heated to a temperature between 910 and 980 ° C and held after reaching the temperature at the thickened end of the tube, the temperature for 10 to 30 minutes. After this time, the tubes 1 were quenched in a water bath to room temperature. In the subsequent tempering process, the tubes were heated to tempering temperatures of 610 ° C to 680 ° C and then held at this temperature for 15 to 45 minutes. This was followed by a cooling in still air.
  • FIG. 5 a shows a graph of the hardness curve over the steel 2
  • Pipe length (pipe body 2, transition area 4, upset pipe end 3) and wall cross-section (outer wall, center of the wall, inner wall).
  • Figure 5b is in a further diagram in comparison of the hardness curve for the examined steels 1 and 2 at the thickened pipe end 3 on the
  • FIG. 6a shows in a diagram the curve of yield strength and tensile strength over the pipe length for steel 2 and FIG. 6b shows in a diagram the profile of yield strength and tensile strength as a function of the steel used at the thickened pipe end 3.
  • the mechanical properties of the pipe end 3 can be adjusted in a targeted manner via the steel composition or the heat treatment during the tempering.
  • FIG. 7a shows in a diagram the yield ratio and elongation over the pipe length likewise for steel 2 and FIG. 7b in a diagram of FIG
  • Wall thickness ratios between pipe body 2 and pipe end 3 and the specified compensation parameters at the thickened pipe end 3 a significant improvement in processing properties by lowering the strength and hardness and increase the toughness could be achieved.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
  • General Engineering & Computer Science (AREA)
  • Forging (AREA)

Abstract

L'invention concerne un procédé de fabrication de tubes (1) laminés à chaud sans cordon en acier transformable, notamment pour des conduites tubulaires destinées à des applications en eau profonde, selon lequel, après avoir terminé le laminage des tubes (1), les extrémités des tubes (3) sont refoulées à chaud afin d'obtenir un épaississement de la paroi. Selon l'invention, pour produire des tubes possédant d'excellentes caractéristiques de fatigue, de corrosion et de soudage, un rapport prédéfini entre une épaisseur de paroi de l'extrémité de tube (3) et une épaisseur de paroi d'un corps de tube (2) venant se raccorder à l'extrémité de tube (3) est réglé par le refoulement à chaud de telle sorte qu'après un traitement thermique uniforme de l'ensemble du tube (1) après le refoulement à chaud, un tube (1) doté d'une extrémité de tube (3) qui possède une solidité plus faible que le corps de tube (2) est obtenu pendant le traitement thermique au moyen d'une vitesse de refroidissement dépendante de l'épaisseur de paroi et déterminée préalablement.
EP15708140.7A 2014-02-25 2015-02-23 Procédé de fabrication de tubes laminés à chaud sans cordon en acier transformable, notamment pour des conduites tubulaires destinées à des applications en eau profonde, et tubes correspondants Withdrawn EP3110980A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014102452.4A DE102014102452A1 (de) 2014-02-25 2014-02-25 Verfahren zur Herstellung von warmgewalzten, nahtlosen Rohren aus umwandlungsfähigem Stahl, insbesondere für Rohrleitungen für Tiefwasseranwendungen und entsprechende Rohre
PCT/EP2015/053707 WO2015128282A1 (fr) 2014-02-25 2015-02-23 Procédé de fabrication de tubes laminés à chaud sans cordon en acier transformable, notamment pour des conduites tubulaires destinées à des applications en eau profonde, et tubes correspondants

Publications (1)

Publication Number Publication Date
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US (1) US20160362759A1 (fr)
EP (1) EP3110980A1 (fr)
JP (1) JP2017512254A (fr)
KR (1) KR20160127752A (fr)
CN (1) CN106232837A (fr)
AR (1) AR099570A1 (fr)
AU (1) AU2015222278B2 (fr)
CA (1) CA2940121A1 (fr)
DE (1) DE102014102452A1 (fr)
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DE102014102452A1 (de) 2015-08-27
US20160362759A1 (en) 2016-12-15
SG11201607034UA (en) 2016-10-28
AR099570A1 (es) 2016-08-03
MX2016011042A (es) 2017-03-09
WO2015128282A1 (fr) 2015-09-03
CA2940121A1 (fr) 2015-09-03
AU2015222278A1 (en) 2016-09-15
EA201691449A1 (ru) 2016-12-30
KR20160127752A (ko) 2016-11-04
AU2015222278B2 (en) 2019-01-17
CN106232837A (zh) 2016-12-14
JP2017512254A (ja) 2017-05-18

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