FI94496B - Process for making point corrosion resistant hard-drawn tubes of copper and copper alloys - Google Patents

Process for making point corrosion resistant hard-drawn tubes of copper and copper alloys

Info

Publication number
FI94496B
FI94496B FI884071A FI884071A FI94496B FI 94496 B FI94496 B FI 94496B FI 884071 A FI884071 A FI 884071A FI 884071 A FI884071 A FI 884071A FI 94496 B FI94496 B FI 94496B
Authority
FI
Finland
Prior art keywords
copper
tubes
films
hard
pitting
Prior art date
Application number
FI884071A
Other languages
Finnish (fi)
Swedish (sv)
Other versions
FI884071A (en
FI884071A0 (en
Inventor
Ulrich Reiter
Achim Baukloh
Original Assignee
Kabel Metallwerke Ghh
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=FI94496(B) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kabel Metallwerke Ghh filed Critical Kabel Metallwerke Ghh
Publication of FI884071A0 publication Critical patent/FI884071A0/en
Publication of FI884071A publication Critical patent/FI884071A/en
Application granted granted Critical
Publication of FI94496B publication Critical patent/FI94496B/en

Links

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

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Articles (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • ing And Chemical Polishing (AREA)
  • Processing Of Meat And Fish (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Saccharide Compounds (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Cleaning In General (AREA)

Abstract

The corrosion damage, particularly that due to local pitting, which occurs on hard-drawn copper tubes used in the sanitary sector is generally caused by carbon-containing films but also by oxide films. A carbon film on the inside of the tube is formed, for example, if the drawing compound added when drawing the tube is subjected to excessive heat. To avoid these damaging films and to improve the pitting resistance of hard tubes made of copper or copper-based alloys, the tubes are first of all degreased. In a further process step, the inner surface of the tubes is then treated with a blasting abrasive in order to establish a minimum roughness. A mean roughness of 0.8 to 1.0 mu m has proven particularly advantageous. The hard-drawn tubes treated by the method according to the invention have none of the films which promote pitting, even after brazing and/or hot bending.
FI884071A 1987-09-10 1988-09-02 Process for making point corrosion resistant hard-drawn tubes of copper and copper alloys FI94496B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3730367A DE3730367C2 (en) 1987-09-10 1987-09-10 Process for the production of pitting-resistant hard drawn tubes made of copper or copper alloys

Publications (3)

Publication Number Publication Date
FI884071A0 FI884071A0 (en) 1988-09-02
FI884071A FI884071A (en) 1989-03-11
FI94496B true FI94496B (en) 1995-06-15

Family

ID=6335681

Family Applications (1)

Application Number Title Priority Date Filing Date
FI884071A FI94496B (en) 1987-09-10 1988-09-02 Process for making point corrosion resistant hard-drawn tubes of copper and copper alloys

Country Status (11)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4417455C2 (en) 1994-05-19 1997-09-25 Wieland Werke Ag Use of a corrosion-resistant tube with inner oxide layers
FI107543B (en) 1998-07-30 2001-08-31 Outokumpu Oy A method for making a copper tube
FI20001467A (en) * 2000-06-20 2001-12-21 Outokumpu Oy Process for making internally coated copper or copper alloy tubes

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308436A1 (en) * 1975-04-25 1976-11-19 Cit Alcatel Avoiding carbon deposits during annealing, from lubricants - in the bore of drawn copper tubes, by sweeping with nitrogen
LU81564A1 (en) * 1979-07-31 1981-03-24 Liege Usines Cuivre Zinc METHOD FOR MANUFACTURING TUBES, TUBES OBTAINED BY THIS PROCESS AND THEIR USE IN CONDENSERS AND HEAT EXCHANGERS
DE3018036A1 (en) * 1980-05-10 1981-11-12 Kabel- und Metallwerke Gutehoffnungshütte AG, 3000 Hannover METHOD OF TREATING COPPER PIPES
IT1160196B (en) * 1983-02-24 1987-03-04 Dalmine Spa HOT DEOXIDATION PROCESS OF SEMI-FINISHED METAL TUBES
DE3415376A1 (en) * 1984-04-25 1985-11-07 Uhlmann, Otto, 3167 Burgdorf Method and apparatus for degreasing tubes
US4579596A (en) * 1984-11-01 1986-04-01 Union Carbide Corporation In-situ removal of oily deposits from the interior surfaces of conduits

Also Published As

Publication number Publication date
YU171088A (en) 1990-04-30
DK495488A (en) 1989-03-11
PT88473A (en) 1988-10-01
ATE103225T1 (en) 1994-04-15
DE3730367A1 (en) 1989-03-23
PL163146B1 (en) 1994-02-28
DE3888605D1 (en) 1994-04-28
EP0306810B2 (en) 2000-03-29
ES2050684T5 (en) 2000-07-01
GR3033568T3 (en) 2000-09-29
DE3730367C2 (en) 1997-10-09
DK495488D0 (en) 1988-09-06
DK170250B1 (en) 1995-07-17
YU46572B (en) 1993-11-16
FI884071A (en) 1989-03-11
PT88473B (en) 1992-11-30
EP0306810A2 (en) 1989-03-15
IE63028B1 (en) 1995-03-22
ES2050684T3 (en) 1994-06-01
EP0306810B1 (en) 1994-03-23
PL274547A1 (en) 1989-05-02
IE882707L (en) 1989-03-10
EP0306810A3 (en) 1990-05-30
FI884071A0 (en) 1988-09-02
DK493288D0 (en) 1988-09-05

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Legal Events

Date Code Title Description
BB Publication of examined application
FC Application refused

Owner name: KABEL- UND METALLWERKE