EP0481902A1 - Verfahren zur Verbesserung der Biegsamkeit von Röhren aus Kupfer mittels einer dynamischen Wärmebehandlung - Google Patents

Verfahren zur Verbesserung der Biegsamkeit von Röhren aus Kupfer mittels einer dynamischen Wärmebehandlung Download PDF

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Publication number
EP0481902A1
EP0481902A1 EP91420365A EP91420365A EP0481902A1 EP 0481902 A1 EP0481902 A1 EP 0481902A1 EP 91420365 A EP91420365 A EP 91420365A EP 91420365 A EP91420365 A EP 91420365A EP 0481902 A1 EP0481902 A1 EP 0481902A1
Authority
EP
European Patent Office
Prior art keywords
tubes
hard
copper
temperature
tube
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.)
Granted
Application number
EP91420365A
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English (en)
French (fr)
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EP0481902B1 (de
Inventor
Abbas Bohran Tavakoli
Patrick Boisgontier
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.)
Trefimetaux SAS
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Trefimetaux SAS
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Publication date
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Publication of EP0481902A1 publication Critical patent/EP0481902A1/de
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Definitions

  • the invention relates to a method for improving the workability of drawn, hard copper tubes.
  • Hard copper tubes are mainly used in sanitary installations. Their rate of use of pressurized sanitary water inside homes today reaches 90%.
  • the expression "hard copper tubes” includes copper tubes or copper alloys capable of being used inter alia in sanitary installations. The implementation of these tubes requires bending operations which are carried out either on site with manual benders, or in the workshop with automatic benders with pneumatic or hydraulic control.
  • Straight copper tubes are most often produced from a large diameter tubular blank obtained by hot spinning, followed successively by cold rolling and drawing to final dimensions without intermediate annealing.
  • the finished hard tubes have a very low residual ductility and consequently the bending operation risks generating cracks, incipient fractures and even breakages.
  • These curves each have an inflection point of abscissa T Rm and T A% respectively, these inflection points also being very close to the point of intersection of the two curves, of abscissa T i .
  • All copper alloys exhibit characteristic softening curves, generally shifted towards high temperatures. This difference is, all other things being equal, essentially due to the presence of the elements of addition.
  • the first object of the invention is a method for increasing the elongation (A%) of the hard copper tubes to a sufficient level so that the defects resulting from the bending of hard copper tubes according to the prior art do not appear. , and that, while respecting the current standards or in preparation on hard copper tubes.
  • Another object of the invention is a reliable and economical manufacturing process for bendable hard copper tubes without the appearance of defects and giving reproducible results whatever the manufacturing methods of the hard copper tubes used.
  • the method for improving the workability of hard copper or copper alloy tubes comprises a heat treatment of said hard tubes and is characterized in that the hard tubes are continuously scrolled through a heating device allowing bring the tube to a treatment temperature between T Rm -50 ° C and T Rm -100 ° C for a time between 0.1 and 10 seconds, T Rm being the temperature (° C) at which the curve d softening of said copper or copper alloy, which gives the tensile strength Rm as a function of temperature, has an inflection point (this temperature is called half-softening temperature).
  • the heating device is an induction furnace having sufficient power to allow the scrolling of tubes at a speed between 30 and 250 m / min.
  • the geometry of the inductor choose the power and the frequency to carry out the invention.
  • the treatment temperature is between 380 and 415 ° C.
  • the Applicant has observed that it is advantageous to control the atmosphere inside and outside the hard tubes during the short period of time when they are brought to high temperature.
  • the external gas atmosphere of the hard tubes during heating consists of a gas neutral while that inside the hard tubes contains oxygen.
  • the gaseous atmosphere inside the hard tubes can be air or a mixture of air and oxygen in all proportions, which can optionally be circulated. It is thus possible on the one hand to greatly reduce the content of lubricant residues and on the other hand to form a thin layer of Cu2O on the inner surface of the tube, all of which improve corrosion resistance.
  • Figure 2 gives the diagram of the installation. It includes a supply of straight copper tube (9), straight with means (7) to ensure a regular advancement of the tube and at a predetermined speed, the passage of the tube in an induction heating device comprising the induction furnace (1 ) and the generator (6), the passage through a cooling device (2) allowing the temperature of the tube to drop rapidly (quenching).
  • the tube was made to circulate in an enclosure (3) provided with a circulation of nitrogen.
  • the installation may include, as shown diagrammatically in FIG. 2, a hardness control device (5) which continuously measures, during travel, the hardness of the treated tube.
  • a hardness control device (5) which continuously measures, during travel, the hardness of the treated tube.
  • it is advantageous to control the residence time and / or the treatment temperature to the hardness measured continuously for example using a device (10) controlling the installation automatically according to predetermined set values and according to parameter values such as hardness (shown diagrammatically by sensor 5) or temperature (sensor not shown in the figure), which further contributes to improving reliability and the reproducibility of the process.
  • the installation may include a device (8) for cutting hard, straight tubes of predetermined constant length.
  • the properties of the hard tubes treated according to the invention were measured: Bending tests were also carried out on the two crowns before and after the treatment of the invention with a hydraulic and automatic bender making it possible to make hangers of radius (with neutral fiber) of 52.5 mm, 49 mm (standard value ), 42 mm, 35 mm and 28 mm. These radii correspond respectively to the bending ratios (bending radius / tube diameter) 3.75, 3.5, 3.0, 2.5 and 2.0.
  • FIG. 1 is a diagram representing the qualitative development of the breaking load Rm (y-axis on the left) as a function of the temperature T (softening curve of the alloy), and the qualitative development of the elongation at break A% (y-axis on the right) as a function of temperature.
  • FIG. 3 is a diagram which translates the results of workability, with on the ordinate the percentage of bending tests recognized as good and on the abscissa the ratio "bending radius / diameter of the tube". The smaller this ratio, the more severe the bending.
  • Curve A corresponds to the tubes before the treatment according to the invention.
  • Curve B corresponds to the tubes obtained according to the invention, with a treatment at 400 ° C.
  • Curve C corresponds to the tubes having undergone a treatment at 300 ° C. (outside the field defined by the invention).

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP91420365A 1990-10-18 1991-10-16 Verfahren zur Verbesserung der Biegsamkeit von Röhren aus Kupfer mittels einer dynamischen Wärmebehandlung Expired - Lifetime EP0481902B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9013484A FR2668170B1 (fr) 1990-10-18 1990-10-18 Procede d'amelioration de la cintrabilite de tubes de cuivre a l'etat dur par traitement thermique dynamique.
FR9013484 1990-10-18

Publications (2)

Publication Number Publication Date
EP0481902A1 true EP0481902A1 (de) 1992-04-22
EP0481902B1 EP0481902B1 (de) 1995-11-29

Family

ID=9401725

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91420365A Expired - Lifetime EP0481902B1 (de) 1990-10-18 1991-10-16 Verfahren zur Verbesserung der Biegsamkeit von Röhren aus Kupfer mittels einer dynamischen Wärmebehandlung

Country Status (4)

Country Link
EP (1) EP0481902B1 (de)
DE (1) DE69114991T2 (de)
ES (1) ES2079618T3 (de)
FR (1) FR2668170B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4334536A1 (de) * 1993-10-09 1995-04-13 Kabelmetal Ag Verfahren zur Herstellung von nahtlos gezogenen halbharten/harten Installationsrohren

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1138485A (en) * 1965-10-20 1969-01-01 Phelps Dodge Copper Prod Process for production of tubes
US3965027A (en) * 1974-03-11 1976-06-22 Calgon Corporation Scale inhibition and corrosion inhibition
BE841148A (fr) * 1976-04-26 1976-08-16 Procede de fabrication de rouleaux de tube en cuivre ou alliage de cuivre
FR2490116A1 (fr) * 1980-09-12 1982-03-19 Gp Konstruk Procede de fabrication de tubes en laiton et tubes obtenus par ledit procede
EP0213771A2 (de) * 1985-08-02 1987-03-11 Westinghouse Electric Corporation Ausglühen von Metallröhren

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3956027A (en) * 1975-04-09 1976-05-11 Olin Corporation Processing copper base alloys
FR2547317B3 (fr) * 1983-06-09 1986-02-28 Trefimetaux Procede d'amelioration de la cintrabilite d'un tube de cuivre ecroui, par recuit partiel
JPH0674494B2 (ja) * 1985-04-04 1994-09-21 株式会社神戸製鋼所 調質銅管の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1138485A (en) * 1965-10-20 1969-01-01 Phelps Dodge Copper Prod Process for production of tubes
US3965027A (en) * 1974-03-11 1976-06-22 Calgon Corporation Scale inhibition and corrosion inhibition
BE841148A (fr) * 1976-04-26 1976-08-16 Procede de fabrication de rouleaux de tube en cuivre ou alliage de cuivre
FR2490116A1 (fr) * 1980-09-12 1982-03-19 Gp Konstruk Procede de fabrication de tubes en laiton et tubes obtenus par ledit procede
EP0213771A2 (de) * 1985-08-02 1987-03-11 Westinghouse Electric Corporation Ausglühen von Metallröhren

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
AMERICAN SOCIETY FOR METALS 'METALS HANDBOOK EDITION 9 VOL 2' 1979 , ASM , METALS PARK, OHIO, US "HEAT TREATING OF COPPER AND COPPER ALLOYS" *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 75 (C-408)(2522) 6 Mars 1987 & JP-A-61 231 146 ( KOBE STEEL LTD ) 15 Octobre 1986 *

Also Published As

Publication number Publication date
DE69114991T2 (de) 1996-04-18
DE69114991D1 (de) 1996-01-11
ES2079618T3 (es) 1996-01-16
EP0481902B1 (de) 1995-11-29
FR2668170A1 (fr) 1992-04-24
FR2668170B1 (fr) 1992-12-11

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