PT88473A - VERFAHREN ZUR HERSTELLUNG LOCKFRASSBESTAENDIGER HARTGEZOGENER ROHRE AUS KUPFER ODER KUPFERLEGIERUNGEN - Google Patents
VERFAHREN ZUR HERSTELLUNG LOCKFRASSBESTAENDIGER HARTGEZOGENER ROHRE AUS KUPFER ODER KUPFERLEGIERUNGENInfo
- Publication number
- PT88473A PT88473A PT88473A PT8847388A PT88473A PT 88473 A PT88473 A PT 88473A PT 88473 A PT88473 A PT 88473A PT 8847388 A PT8847388 A PT 8847388A PT 88473 A PT88473 A PT 88473A
- Authority
- PT
- Portugal
- Prior art keywords
- tubes
- films
- hard
- copper
- lockfrassbestaendiger
- Prior art date
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.
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 (2)
| Publication Number | Publication Date |
|---|---|
| PT88473A true PT88473A (en) | 1988-10-01 |
| PT88473B PT88473B (en) | 1992-11-30 |
Family
ID=6335681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PT88473A PT88473B (en) | 1987-09-10 | 1988-09-09 | PROCESS FOR THE MANUFACTURE OF COPPER TUBES OR COPPER ALLOYS, INTENSELY STRETCHED, RESISTANT TO FISSURE FORMATION |
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)
| 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)
| 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 |
-
1987
- 1987-09-10 DE DE3730367A patent/DE3730367C2/en not_active Expired - Fee Related
-
1988
- 1988-08-31 AT AT88114157T patent/ATE103225T1/en not_active IP Right Cessation
- 1988-08-31 DE DE88114157T patent/DE3888605D1/en not_active Expired - Fee Related
- 1988-08-31 ES ES88114157T patent/ES2050684T5/en not_active Expired - Lifetime
- 1988-08-31 EP EP88114157A patent/EP0306810B2/en not_active Expired - Lifetime
- 1988-09-02 FI FI884071A patent/FI94496B/en not_active Application Discontinuation
- 1988-09-05 DK DK493288A patent/DK493288D0/en not_active Application Discontinuation
- 1988-09-06 DK DK495488A patent/DK170250B1/en not_active IP Right Cessation
- 1988-09-07 PL PL88274547A patent/PL163146B1/en not_active IP Right Cessation
- 1988-09-07 IE IE270788A patent/IE63028B1/en not_active IP Right Cessation
- 1988-09-08 YU YU171088A patent/YU46572B/en unknown
- 1988-09-09 PT PT88473A patent/PT88473B/en not_active IP Right Cessation
-
2000
- 2000-05-31 GR GR20000401261T patent/GR3033568T3/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| YU171088A (en) | 1990-04-30 |
| DK495488A (en) | 1989-03-11 |
| 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 |
| FI94496B (en) | 1995-06-15 |
| 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 |
|---|---|---|---|
| FG3A | Patent granted, date of granting |
Effective date: 19920507 |
|
| MM4A | Annulment/lapse due to non-payment of fees, searched and examined patent |
Free format text: MAXIMUM VALIDITY LIMIT REACHED Effective date: 20080909 |