EP0306810A2 - Procédé pour la fabrication de tubes en cuivre ou en alliages cuivreux étirés à froid et résistant à la corrosion - Google Patents

Procédé pour la fabrication de tubes en cuivre ou en alliages cuivreux étirés à froid et résistant à la corrosion Download PDF

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Publication number
EP0306810A2
EP0306810A2 EP88114157A EP88114157A EP0306810A2 EP 0306810 A2 EP0306810 A2 EP 0306810A2 EP 88114157 A EP88114157 A EP 88114157A EP 88114157 A EP88114157 A EP 88114157A EP 0306810 A2 EP0306810 A2 EP 0306810A2
Authority
EP
European Patent Office
Prior art keywords
tubes
copper
pitting
films
treated
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
EP88114157A
Other languages
German (de)
English (en)
Other versions
EP0306810A3 (en
EP0306810B2 (fr
EP0306810B1 (fr
Inventor
Achim Dr. Baukloh
Ulrich Dr. Reiter
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.)
KM Kabelmetal AG
Original Assignee
KM Kabelmetal AG
KM Europa Metal AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6335681&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0306810(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by KM Kabelmetal AG, KM Europa Metal AG filed Critical KM Kabelmetal AG
Priority to AT88114157T priority Critical patent/ATE103225T1/de
Publication of EP0306810A2 publication Critical patent/EP0306810A2/fr
Publication of EP0306810A3 publication Critical patent/EP0306810A3/de
Application granted granted Critical
Publication of EP0306810B1 publication Critical patent/EP0306810B1/fr
Publication of EP0306810B2 publication Critical patent/EP0306810B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C3/00—Abrasive blasting machines or devices; Plants
    • B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
    • B24C3/325—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes
    • B24C3/327—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for internal surfaces, e.g. of tubes by an axially-moving flow of abrasive particles without passing a blast gun, impeller or the like along the internal surface

Definitions

  • the invention relates to a method for producing pitting-resistant hard drawn tubes made of copper or copper alloys. Furthermore, the invention relates to the use of the pipes produced by this method as installation pipes in elongated lengths for the sanitary area.
  • a more or less coherent carbon film can form on the inside of the pipe if the pipes are connected to one another, for example, by brazing or heated to facilitate bending.
  • degreasing agents for example organic solvents such as per- or trichlorethylene.
  • Another method involves evaporating the drawing oil and drawing off the drawing oil vapors.
  • Another type of treatment is to carry out the annealing in a reducing atmosphere and to remove the resulting carbon film by means of an abrasive.
  • an abrasive is introduced into the tube either by pressurized water or compressed air.
  • the invention has for its object to prevent the formation of carbon and / or oxide films during brazing or hot bending of hard drawn tubes made of copper or copper alloys and thus to improve the pitting resistance of these tubes.
  • the method according to the teaching of the invention differs from the previously known essentially soft-annealed copper tubes-related methods by a combination of chemical and mechanical treatment stages.
  • the method according to the invention surprisingly succeeds in avoiding the formation of harmful films, for example carbon-containing films or oxide films, on the inner surface of hard-drawn copper pipes.
  • harmful films for example carbon-containing films or oxide films
  • These films which act as bipolar electrodes according to the theory, generally arise at the temperatures customary for brazing or hot bending copper pipes.
  • the harmful films can essentially be avoided by the fact that the inner surface of copper pipes, largely freed from the drawing oil, has a certain minimum roughness after the additional blasting treatment. It is therefore important that a certain surface structure is achieved on the inner surface of the tubes, which enables only very little adhesion to the films produced during heat treatment. Stable corrosion elements, which are the cause of pitting corrosion, cannot develop.
  • the abrasive treatment is carried out in such a way that the inner surface of the tubes has a mean roughness value between 0.8 ⁇ m and 1.0 ⁇ m.
  • a felt plug filling the pipe cross-section can be introduced, for example, and the felt plug, which may be soaked with a cleaning agent, can then be transported through the pipe length by means of pressure.
  • simply blowing out with compressed air will be sufficient to remove corundum particles adhering to the inner wall of the pipe.
  • the average roughness R a was found to be 0.8 ⁇ m.
  • the residual carbon content was ⁇ 0.03 mg / dm2 below the detection limit. Long-term tests in various corrosion-promoting household waters did not show any significant formation of pitting corrosion. Likewise, no corrosion damage occurred after brazing and / or hot bending.
  • tubes 15 x 1 mm drawn were first degreased with trichloroethane, dried and then briefly immersed in a nitric acid bath.
  • the other process conditions for the blasting agent treatment corresponded to those of Example 1.
  • Long-term tests of five test benches operated in practice with areas that favor pitting corrosion showed no signs of pitting attack.
  • the inside surface of the pipes had a shiny metallic appearance.
  • the water throughput during the flow times was about 1.5 l / min, which corresponds to an average flow velocity of about 0.2 m / s for the test tube.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Extraction Processes (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Heat Treatment Of Articles (AREA)
  • Cleaning In General (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • ing And Chemical Polishing (AREA)
  • Saccharide Compounds (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Processing Of Meat And Fish (AREA)
EP88114157A 1987-09-10 1988-08-31 Procédé pour la fabrication de tubes en cuivre ou en alliages cuivreux étirés à froid et résistant à la corrosion Expired - Lifetime EP0306810B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114157T ATE103225T1 (de) 1987-09-10 1988-08-31 Verfahren zur herstellung lochfrassbestaendiger hartgezogener rohre aus kupfer oder kupferlegierungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3730367 1987-09-10
DE3730367A DE3730367C2 (de) 1987-09-10 1987-09-10 Verfahren zur Herstellung lochfraßbeständiger hartgezogener Rohre aus Kupfer oder Kupferlegierungen

Publications (4)

Publication Number Publication Date
EP0306810A2 true EP0306810A2 (fr) 1989-03-15
EP0306810A3 EP0306810A3 (en) 1990-05-30
EP0306810B1 EP0306810B1 (fr) 1994-03-23
EP0306810B2 EP0306810B2 (fr) 2000-03-29

Family

ID=6335681

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88114157A Expired - Lifetime EP0306810B2 (fr) 1987-09-10 1988-08-31 Procédé pour la fabrication de tubes en cuivre ou en alliages cuivreux étirés à froid et résistant à la corrosion

Country Status (11)

Country Link
EP (1) EP0306810B2 (fr)
AT (1) ATE103225T1 (fr)
DE (2) DE3730367C2 (fr)
DK (2) DK493288D0 (fr)
ES (1) ES2050684T5 (fr)
FI (1) FI94496B (fr)
GR (1) GR3033568T3 (fr)
IE (1) IE63028B1 (fr)
PL (1) PL163146B1 (fr)
PT (1) PT88473B (fr)
YU (1) YU46572B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976845A1 (fr) 1998-07-30 2000-02-02 Outokumpu Oyj Procédé pour la fabrication de tubes en cuivre
EP1167563A1 (fr) * 2000-06-20 2002-01-02 Outokumpu Oyj Procédé de fabrication de tuyaux en cuivre ou en alliage de cuivre avec revêtement intérieur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4417455C2 (de) 1994-05-19 1997-09-25 Wieland Werke Ag Verwendung eines korrosionsbeständigen Rohres mit inneren Oxidschichten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308436A1 (fr) * 1975-04-25 1976-11-19 Cit Alcatel Traitement des tubes en cuivre et alliages en vue de l'elimination des produits carbones subsistant a leur surface
GB2075391A (en) * 1980-05-10 1981-11-18 Kabel Metallwerke Ghh Process for treating copper tubes
GB2135336A (en) * 1983-02-24 1984-08-30 Dalmine Spa Hot deoxidation of semifinished metal tubes
DE3415376A1 (de) * 1984-04-25 1985-11-07 Uhlmann, Otto, 3167 Burgdorf Verfahren und vorrichtung zum entfetten von rohren
EP0180228A2 (fr) * 1984-11-01 1986-05-07 Union Carbide Corporation Enlèvement in-situ de dépôts d'huile des surfaces intérieures de conduits

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308436A1 (fr) * 1975-04-25 1976-11-19 Cit Alcatel Traitement des tubes en cuivre et alliages en vue de l'elimination des produits carbones subsistant a leur surface
GB2075391A (en) * 1980-05-10 1981-11-18 Kabel Metallwerke Ghh Process for treating copper tubes
GB2135336A (en) * 1983-02-24 1984-08-30 Dalmine Spa Hot deoxidation of semifinished metal tubes
DE3415376A1 (de) * 1984-04-25 1985-11-07 Uhlmann, Otto, 3167 Burgdorf Verfahren und vorrichtung zum entfetten von rohren
EP0180228A2 (fr) * 1984-11-01 1986-05-07 Union Carbide Corporation Enlèvement in-situ de dépôts d'huile des surfaces intérieures de conduits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0976845A1 (fr) 1998-07-30 2000-02-02 Outokumpu Oyj Procédé pour la fabrication de tubes en cuivre
EP1167563A1 (fr) * 2000-06-20 2002-01-02 Outokumpu Oyj Procédé de fabrication de tuyaux en cuivre ou en alliage de cuivre avec revêtement intérieur

Also Published As

Publication number Publication date
PL274547A1 (en) 1989-05-02
EP0306810A3 (en) 1990-05-30
ATE103225T1 (de) 1994-04-15
DK495488A (da) 1989-03-11
FI94496B (fi) 1995-06-15
DK493288D0 (da) 1988-09-05
GR3033568T3 (en) 2000-09-29
DE3730367A1 (de) 1989-03-23
YU46572B (sh) 1993-11-16
YU171088A (en) 1990-04-30
DK170250B1 (da) 1995-07-17
ES2050684T5 (es) 2000-07-01
DE3730367C2 (de) 1997-10-09
PT88473A (pt) 1988-10-01
EP0306810B2 (fr) 2000-03-29
ES2050684T3 (es) 1994-06-01
IE882707L (en) 1989-03-10
EP0306810B1 (fr) 1994-03-23
FI884071A0 (fi) 1988-09-02
DE3888605D1 (de) 1994-04-28
DK495488D0 (da) 1988-09-06
FI884071A (fi) 1989-03-11
PL163146B1 (pl) 1994-02-28
PT88473B (pt) 1992-11-30
IE63028B1 (en) 1995-03-22

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