EP0976845B1 - Verfahren zur Herstellung von Kupferrohren - Google Patents

Verfahren zur Herstellung von Kupferrohren Download PDF

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Publication number
EP0976845B1
EP0976845B1 EP99114365A EP99114365A EP0976845B1 EP 0976845 B1 EP0976845 B1 EP 0976845B1 EP 99114365 A EP99114365 A EP 99114365A EP 99114365 A EP99114365 A EP 99114365A EP 0976845 B1 EP0976845 B1 EP 0976845B1
Authority
EP
European Patent Office
Prior art keywords
tube
annealing
oxygen
gas
inline
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.)
Expired - Lifetime
Application number
EP99114365A
Other languages
English (en)
French (fr)
Other versions
EP0976845A1 (de
Inventor
Seppo Välimäki
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.)
CUPORI GROUP OY
Original Assignee
Outokumpu Oyj
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 Outokumpu Oyj filed Critical Outokumpu Oyj
Publication of EP0976845A1 publication Critical patent/EP0976845A1/de
Application granted granted Critical
Publication of EP0976845B1 publication Critical patent/EP0976845B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum

Definitions

  • This invention focuses on a method for producing copper tube and particularly for hard-drawn temper sanitary tube.
  • the extruded tube shell is cold formed until almost its final size, after which the tube undergoes inline annealing in oxidizing conditions in order to adjust the tube to its final size in the cold forming step with finally sand blasting to the inner surface of the tube.
  • the use of organic solvents is avoided and at the same time a tube with excellent corrosion resistance is achieved.
  • the conventional method for treating hard tubes has comprised cold forming steps following extrusion, such as bull-block drawing, straightening and cutting and subsequent degreasing, in which drawing lubricant is removed from the inner surface of the tube. Residual lubricant is removed so that it does not form a carbon film during installation, which in turn would promote pitting.
  • this degreasing step has involved immersing the tubes in an organic solvent such as trichloroethylene.
  • patent application EP 306 810 there is known a treatment method for hard-drawn sanitary tubes, in which tube is produced from tube shell using normal cold forming steps, after which the tube undergoes degreasing, wherein the tubes are first immersed in organic solvent and subsequently treated with a jet of sand.
  • EP patent application 647 723 describes a manufacturing method for half hard or hard tubes, where the intention is for the tube to release as small an amount of copper ions as possible into for example normal drinking water.
  • the tube shell is cold formed to an intermediate size, after which the inner surface is roughened.
  • the roughening can be either performed by sand blasting or etching (Beizen).
  • the tube is routed to annealing treatment at a temperature of 350 - 650 °C, wherein a mixture of shielding gas and oxygen (1-7% O 2 ) is introduced into the tube, in order to form a protective oxide film to the inner surface of the tube.
  • the tube subsequently undergoes cold drawing to a final size, wherein the reduction is about 20%.
  • the tube can be degreased after cold drawing. After the final draw the tube is subjected to further thermal treatment at a temperature of 175 - 275 °C in the presence of oxygenous gas (at least 20% O 2 ). The result of this treatment is that a very stable malachite layer forms rapidly on the inner surface of the tube, which prevents the dissolution of copper ions into drinking water.
  • hard copper tubes suitable for sanitary installations can be manufactured in a simple fashion.
  • the extruded tube shell is drawn using conventional cold forming technology until almost its final size.
  • oxygen or oxygen-enriched gas is conducted into the tube coil, and the tube is heated by inline annealing briefly at a temperature of 450 - 650 °C, preferably 500 - 600 °C. In so doing, any residual lubricants on the inner surface are be burnt off.
  • the tube undergoes a final, approx. 5-20% forming step. After this the tube is cut to the specified size and the inner surface of the tube is sand blasted.
  • the drawing of the tube through the annealing furnace is carried out at such a speed, 100 - 200 m/min, preferably 120 - 160 m/min, that the structure has not time to recrystallize or soften.
  • there is oxygen or oxygen-enriched gas inside the tube with oxygen enrichment of at least 20% and preferably at least 50%.
  • the tube is formed in such a way that its values are well within the region of hard tube.
  • One advantage of drawing after annealing is that the tube will be formed precisely to the tolerance sets.
  • Copper tube was manufactured as normal by extrusion and bull-block drawing, but in the final bull-block drawing the tube was left at a bigger size than the final one.
  • the tube coil was filled with oxygen-containing gas and heated briefly at a temperature of 500-650 °C.
  • the table below lists the properties of the tube after the final drawing (tube size 15 x 1 mm) and a comparison with the requirements set by standard EN1057 for hard tubes. Bending according to the standard means that the bending test is performed in accordance with the conditions laid down in standard EN 10232, so no tear shall be visible to the unaided eye at this stage.
  • the 1 st class mentioned in the test results means that the tube meets the stringent requirements of the standard.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Metallurgy (AREA)
  • Metal Extraction Processes (AREA)
  • Laminated Bodies (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (8)

  1. Verfahren zur Herstellung von harten Kupferrohren für Sanitäranwendungen, wobei das Rohr durch Extrusion und Kaltformen hergestellt wird,
    dadurch gekennzeichnet, dass das Rohr beim Kattziehen bis fast auf seine endgültige Größe gezogen wird, wonach Sauerstoff enthaltendes Gas in das Rohr geleitet wird und das Rohr kurzer Inline-Glühung bei einer Temperatur von 450 bis 650 ° C und in einer solchen Geschwindigkeit unterzogen wird, dass die Struktur keine Zeit hat, um zu rekristallisieren oder zu erweichen, wonach das Rohr einer Formung von 5 - 20 % unterzogen wird und danach die innere Oberfläche des Rohres gesandstrahlt wird, um Ziehfettüberreste zu entfernen.
  2. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass Inline-Glühen an dem Rohr bei einer Geschwindigkeit von 100 - 200 m/min durchgeführt wird.
  3. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass Inline-Glühen an dem Rohr bei einer Geschwindigkeit von 100 - 160 m/min durchgeführt wird.
  4. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass Inline-Glühen an dem Rohr bei einer Temperatur von 500 - 600° C durchgeführt wird.
  5. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass während des Glühens Sauerstoff innerhalb des Rohres ist.
  6. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass während des Glühens Gas innerhalb des Rohres ist, welches Gas eine Sauerstoffanreicherung von wenigstens 50 % hat.
  7. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass während des Glühens Gas innerhalb des Rohres ist, welches Gas eine Sauerstoffanreicherung von wenigstens 20 % hat.
  8. Verfahren nach Anspruch 1,
    dadurch gekennzeichnet, dass der letzte Formungsschritt Senkung ist.
EP99114365A 1998-07-30 1999-07-21 Verfahren zur Herstellung von Kupferrohren Expired - Lifetime EP0976845B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI981683A FI107543B (fi) 1998-07-30 1998-07-30 Menetelmä kupariputken valmistamiseksi
FI981683 1998-07-30

Publications (2)

Publication Number Publication Date
EP0976845A1 EP0976845A1 (de) 2000-02-02
EP0976845B1 true EP0976845B1 (de) 2003-07-16

Family

ID=8552250

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99114365A Expired - Lifetime EP0976845B1 (de) 1998-07-30 1999-07-21 Verfahren zur Herstellung von Kupferrohren

Country Status (9)

Country Link
EP (1) EP0976845B1 (de)
AT (1) ATE245208T1 (de)
DE (1) DE69909565T2 (de)
DK (1) DK0976845T3 (de)
ES (1) ES2202969T3 (de)
FI (1) FI107543B (de)
NO (1) NO312619B1 (de)
PL (1) PL189820B1 (de)
PT (1) PT976845E (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20001467A7 (fi) * 2000-06-20 2001-12-21 Outokumpu Oy Menetelmä sisäpuolelta pinnoitettujen kupari- tai kupariseosputkien valmistamiseksi
FI120359B (fi) * 2002-12-18 2009-09-30 Cupori Group Oy Menetelmä ja laitteisto kupari- tai kupariseosputken sisäpinnan käsittelemiseksi
CN101492798B (zh) * 2009-03-13 2010-12-29 无锡隆达金属材料有限公司 铜合金管材无酸洗制造工艺
CN110605304A (zh) * 2019-09-18 2019-12-24 上海海亮铜业有限公司 铝黄铜薄壁管生产工艺
CN111979390A (zh) * 2020-07-02 2020-11-24 中国船舶重工集团公司第七二五研究所 一种去除小口径海水铜镍管内表面残碳的方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU67959A1 (de) * 1973-07-06 1975-04-11
LU81564A1 (fr) * 1979-07-31 1981-03-24 Liege Usines Cuivre Zinc Procede de fabrication de tubes,tubes obtenus par ce procede et leur utilisation dans des condenseurs et des echangeurs de chaleur
DE3003228C2 (de) * 1980-01-30 1981-11-26 Wieland-Werke Ag, 7900 Ulm Verfahren zur Verbesserung der Korrosionsbeständigkeit von Installationsrohren aus Kupfer
DE3018036A1 (de) * 1980-05-10 1981-11-12 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover Verfahren von behandlung von kupferrohren
US4351678A (en) * 1980-08-06 1982-09-28 Usines A Cuivre Et A Zinc De Liege Method of making corrosion resistant phosphorous copper or phosphorous copper alloy pipes
ATE45993T1 (de) 1987-03-07 1989-09-15 Wieland Werke Ag Verfahren zur verbesserung der korrosionsbestaendigkeit von harten bzw. halbharten installationsrohren aus kupfer.
DE3730367C2 (de) 1987-09-10 1997-10-09 Km Europa Metal Ag Verfahren zur Herstellung lochfraßbeständiger hartgezogener Rohre aus Kupfer oder Kupferlegierungen
EP0335999A1 (de) * 1988-04-08 1989-10-11 Wieland-Werke AG Verfahren zur Reinigung von Metallrohren, insbes. Kupferrohren
DE3827353A1 (de) * 1988-08-12 1990-02-22 Kabelmetal Ag Innenoxidierte rohre
DE4334536A1 (de) * 1993-10-09 1995-04-13 Kabelmetal Ag Verfahren zur Herstellung von nahtlos gezogenen halbharten/harten Installationsrohren

Also Published As

Publication number Publication date
FI981683A0 (fi) 1998-07-30
NO993683L (no) 2000-01-31
NO312619B1 (no) 2002-06-10
ATE245208T1 (de) 2003-08-15
FI981683L (fi) 2000-01-31
PT976845E (pt) 2003-10-31
DE69909565D1 (de) 2003-08-21
DE69909565T2 (de) 2004-01-29
NO993683D0 (no) 1999-07-29
DK0976845T3 (da) 2003-10-27
FI107543B (fi) 2001-08-31
PL334652A1 (en) 2000-01-31
EP0976845A1 (de) 2000-02-02
ES2202969T3 (es) 2004-04-01
PL189820B1 (pl) 2005-09-30

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