EP0566978A2 - Use of a copper-aluminium-zinc alloy as corrosion resistant material - Google Patents
Use of a copper-aluminium-zinc alloy as corrosion resistant material Download PDFInfo
- Publication number
- EP0566978A2 EP0566978A2 EP93106091A EP93106091A EP0566978A2 EP 0566978 A2 EP0566978 A2 EP 0566978A2 EP 93106091 A EP93106091 A EP 93106091A EP 93106091 A EP93106091 A EP 93106091A EP 0566978 A2 EP0566978 A2 EP 0566978A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- copper
- copper alloy
- maximum
- alloy according
- aluminium
- 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
Links
- 230000007797 corrosion Effects 0.000 title claims abstract description 15
- 238000005260 corrosion Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 title claims abstract description 10
- 229910001297 Zn alloy Inorganic materials 0.000 title claims abstract description 6
- -1 copper-aluminium-zinc Chemical compound 0.000 title claims abstract description 6
- 239000010949 copper Substances 0.000 claims abstract description 19
- 239000011701 zinc Substances 0.000 claims abstract description 7
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 6
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims abstract description 5
- 239000003651 drinking water Substances 0.000 claims abstract description 3
- 235000020188 drinking water Nutrition 0.000 claims abstract description 3
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 239000010955 niobium Substances 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000011135 tin Substances 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 abstract 1
- 238000009428 plumbing Methods 0.000 abstract 1
- 230000010287 polarization Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 2
- 229910017777 Cu—Al—Zn Inorganic materials 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/01—Alloys based on copper with aluminium as the next major constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/04—Alloys based on copper with zinc as the next major constituent
Definitions
- the invention relates to the use of a copper-aluminum-zinc alloy as a corrosion-resistant material for pipes in installation and sanitary engineering and in the drinking water sector.
- Pipes for the purpose mentioned are widely made from oxygen-free copper (SF-Cu).
- SF-Cu oxygen-free copper
- a special manufacturing process can be used to create an oxidic protective layer on the inside of the pipe.
- An alternative is an alloyed material, in which an oxidic, protective cover layer automatically forms under operating conditions.
- a Cu-Mg-Al / Si alloy (DE-PS 3,043,833), for example, has also been proposed for the purpose mentioned, but it was only able to partially meet the requirements.
- the invention is therefore based on the object of specifying a corrosion-resistant material for which there is no risk of pitting and in which the copper solubility and the mass removal are reduced.
- the object is achieved in accordance with the invention by using a copper-aluminum-zinc alloy which consists of 0.1-1.0% aluminum; 0.1-1.0% zinc; The rest is copper and usual impurities (the percentages relate to the weight).
- composition of a copper alloy of the type mentioned is known, for example, from GB-PS 1,152,481, but there is no indication of the claimed use.
- a copper alloy with 0.1-0.5% aluminum and 0.1-0.5% zinc is used. It is also recommended to use a copper alloy that additionally contains one or more of the elements silicon, magnesium, iron, tin, niobium up to a maximum content of 1.5%. Copper alloys having the compositions according to claims 4 to 10 are preferably used.
- Phosphorus improves the pourability and acts as a deoxidizer.
- Pipes measuring 18 x 1 mm were made of SF-Cu and an alloy according to the invention with the composition according to the following table: material SF-Cu soft, 50-70 HB hard, 100-120 HB CuAl0.3Zn0.3 soft, 50-70 HB hard, 100-120 HB
- the current density-potential curves of the alloy CuAl0.3Zn0.3 and SF-Cu are shown in comparison in FIG. It can be seen that the alloyed elements significantly expand the range of corrosion resistance. The passive current density is reduced compared to SF-Cu, which speaks for the better cover layer quality. The breakthrough potentials have shifted towards more positive potentials.
- the polarization resistance R p or the reciprocal, the polarization conductance R p ⁇ 1 is a measure of the rate of corrosion. The lower the polarization conductance, the greater the resistance to uniform corrosion.
- Figures 2a to c compare the polarization conductance of the material CuAl0.3Zn0.3 in different states (soft / hard) with that of SF-Cu. Unalloyed Cu not only exhibits poorer behavior, but also considerable scatter.
- the mass loss is considerably reduced compared to SF-Cu according to FIG. 3.
- the copper-aluminum-zinc alloy according to the invention shows a significantly better behavior than SF-Cu. Not only is the quality of the covering layer improved, but also the rate of formation is influenced and, above all, the potential range of corrosion resistance is expanded. This formation of the passive layer significantly reduces the Cu solubility.
- Al is capable of forming reaction products in acidic media and thus contributing to the formation of an effective protective layer, the same applies to Zn in alkaline media.
- Both additives stabilize each other and are able to cover a relatively wide pH range together in the Cu-Al-Zn system.
- the materials relating to the invention can thus not only be used in neutral waters. Certain pH fluctuations do not have a negative effect on the corrosion behavior.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
Die Erfindung betrifft die Verwendung einer Kupfer-Aluminium-Zink-Legierung als korrosionsbeständiger Werkstoff für Rohre in der Installations- und Sanitärtechnik und auf dem Trinkwassersektor.The invention relates to the use of a copper-aluminum-zinc alloy as a corrosion-resistant material for pipes in installation and sanitary engineering and in the drinking water sector.
Werkstoffe, die für den obigen Verwendungszweck eingesetzt werden, müssen vielfachen Anforderungen hinsichtlich ihrer Korrosionsbeständigkeit genügen. Die Mehrzahl der Schadensfälle wird durch gleichmäßige Flächenkorrosion oder Lochfraß ausgelöst. Durch unsachgemäße Montage kann es außerdem zu Korrosionsangriffen im Bereich von Lötstellen und Verbindungen kommen.Materials that are used for the above purpose have to meet multiple requirements with regard to their corrosion resistance. The majority of damage cases are caused by even surface corrosion or pitting. Improper installation can also lead to corrosion attacks in the area of solder joints and connections.
Rohre für den genannten Einsatzzweck werden verbreitet aus sauerstofffreiem Kupfer (SF-Cu) hergestellt. Durch spezielle Herstellungsverfahren kann auf der Rohrinnenfläche eine oxidische Schutzschicht erzeugt werden. Eine Alternative ist ein legierter Werkstoff, bei dem sich unter Einsatzbedingungen von selbst eine oxidische, schützende Deckschicht bildet.Pipes for the purpose mentioned are widely made from oxygen-free copper (SF-Cu). A special manufacturing process can be used to create an oxidic protective layer on the inside of the pipe. An alternative is an alloyed material, in which an oxidic, protective cover layer automatically forms under operating conditions.
Für den genannten Einsatzweck ist weiterhin beispielsweise eine Cu-Mg-Al/Si-Legierung (DE-PS 3.043.833) vorgeschlagen worden, welche jedoch die gestellten Anforderungen auch nur teilweise erfüllen konnte.A Cu-Mg-Al / Si alloy (DE-PS 3,043,833), for example, has also been proposed for the purpose mentioned, but it was only able to partially meet the requirements.
Der Erfindung liegt daher die Aufgabe zugrunde, einen korrosionsbeständigen Werkstoff anzugeben, für den keine Lochfraßgefährdung besteht und bei dem die Kupfer-Löslichkeit und der Massenabtrag herabgesetzt werden.The invention is therefore based on the object of specifying a corrosion-resistant material for which there is no risk of pitting and in which the copper solubility and the mass removal are reduced.
Die Aufgabe wird erfindunsgemäß durch die Verwendung einer Kupfer-Aluminium-Zink-Legierung gelöst, die aus 0,1 - 1,0 % Aluminium; 0,1 - 1,0 % Zink; Rest Kupfer und üblichen Verunreinigungen besteht (die Prozentangaben beziehen sich dabei auf das Gewicht).The object is achieved in accordance with the invention by using a copper-aluminum-zinc alloy which consists of 0.1-1.0% aluminum; 0.1-1.0% zinc; The rest is copper and usual impurities (the percentages relate to the weight).
Die Zusammensetzung einer Kupferlegierung der genannten Art ist zwar beispielsweise aus der GB-PS 1.152.481 bekannt, dort findet sich jedoch kein Hinweis auf den beanspruchten Verwendungszweck.The composition of a copper alloy of the type mentioned is known, for example, from GB-PS 1,152,481, but there is no indication of the claimed use.
Nach einer bevorzugten Ausführungsform der Erfindung wird eine Kupferlegierung mit 0,1 - 0,5 % Aluminium und 0,1 - 0,5 % Zink verwendet. Weiterhin empfiehlt es sich, eine Kupferlegierung zu verwenden, die zusätzlich ein oder mehrere der Elemente Silizium, Magnesium, Eisen, Zinn, Niob bis zu einem Maximalgehalt von insgesamt 1,5 % enthält. Vorzugsweise werden Kupferlegierungen mit den Zusammensetzungen nach den Ansprüchen 4 bis 10 verwendet.According to a preferred embodiment of the invention, a copper alloy with 0.1-0.5% aluminum and 0.1-0.5% zinc is used. It is also recommended to use a copper alloy that additionally contains one or more of the elements silicon, magnesium, iron, tin, niobium up to a maximum content of 1.5%. Copper alloys having the compositions according to claims 4 to 10 are preferably used.
Weiterhin ist es vorteilhaft, der Legierung maximal 0,04 % Phosphor zuzusetzen. Phosphor verbessert dabei die Gießbarkeit und wirkt als Desoxidationsmittel.It is also advantageous to add a maximum of 0.04% phosphorus to the alloy. Phosphorus improves the pourability and acts as a deoxidizer.
Die Erfindung wird anhand der folgenden Ausführungsbeispiele näher erläutert:
Es wurden Rohre der Abmessung 18 x 1 mm aus SF-Cu und einer erfindungsgemäßen Legierung mit der Zusammensetzung gemäß der folgenden Tabelle hergestellt:
Pipes measuring 18 x 1 mm were made of SF-Cu and an alloy according to the invention with the composition according to the following table:
Zur Beurteilung des Korrosionsverhaltens wurden an den Rohrmustern Stromdichte-Potential-Kurven (Fig.1) und der elektrochemische Polarisationswiderstand (Rp) bzw. Polarisationsleitwert (Rp⁻¹) gemäß Fig. 2a - 2c gemessen sowie der Massenabtrag (Fig.3) ermittelt.To assess the corrosion behavior, current density-potential curves (Fig. 1) and the electrochemical polarization resistance (R p ) or polarization conductance (R p ⁻¹) according to Figs. 2a - 2c were measured and the mass removal (Fig. 3) determined.
Es zeigen im einzelnen:
- Fig.1:
- die Stromdichte-Potential-Kurve der Legierung CuAl0.3Zn0.3 im Vergleich zu SF-Cu. Bezugselektrode: gesättigte Kalomelelektrode;
- Fig.2a bis 2c:
- den Polarisationsleitwert Rp⁻¹ als Funktion der Versuchsdauer.
- (a) SF-Cu, Zustand weich, 50-70 HB bzw. hart, 100-120 HB
- (b) CuAl0.3Zn0.3, Zustand weich, 50-70 HB
- (c) CuAl0.3Zn0,3, Zustand hart, 100-120 HB;
- Fig.3:
- den auf die Fläche bezogenen Gewichtsverlust nach einer Zeit von 1000 h.
- Fig.1:
- the current density-potential curve of the alloy CuAl0.3Zn0.3 compared to SF-Cu. Reference electrode: saturated calomel electrode;
- Fig.2a to 2c:
- the polarization conductance R p ⁻¹ as a function of the test duration.
- (a) SF-Cu, soft state, 50-70 HB or hard, 100-120 HB
- (b) CuAl0.3Zn0.3, soft state, 50-70 HB
- (c) CuAl0.3Zn0.3, hard state, 100-120 HB;
- Fig. 3:
- the weight loss related to the area after a period of 1000 h.
In Fig.1 sind die Stromdichte-Potential-Kurven der Legierung CuAl0.3Zn0.3 und SF-Cu im Vergleich dargestellt. Es ist zu erkennen, daß die zulegierten Elemente den Bereich der Korrosionsbeständigkeit deutlich erweitern. Die Passivstromdichte ist gegenüber SF-Cu verringert, was für die bessere Deckschichtqualität spricht. Die Durchbruchpotentiale sind zu positiveren Potentialen hin verschoben.The current density-potential curves of the alloy CuAl0.3Zn0.3 and SF-Cu are shown in comparison in FIG. It can be seen that the alloyed elements significantly expand the range of corrosion resistance. The passive current density is reduced compared to SF-Cu, which speaks for the better cover layer quality. The breakthrough potentials have shifted towards more positive potentials.
Der Polaristationswiderstand Rp bzw. der Kehrwert, der Polaristationsleitwert Rp⁻¹, ist ein Maß für die Korrossionsgeschwindigkeit. Je geringer der Polarisationsleitwert, desto größer ist die Beständigkeit gegen gleichmäßige Korrosion. Die Figuren 2a bis c vergleichen den Polarisationsleitwert des Werkstoffes CuAl0.3Zn0.3 in verschiedenen Zuständen (weich/hart) mit demjenigen von SF-Cu. Unlegiertes Cu zeigt nicht nur ein schlechteres Verhalten, sondern auch eine beträchtliche Streuung.The polarization resistance R p or the reciprocal, the polarization conductance R p ⁻¹, is a measure of the rate of corrosion. The lower the polarization conductance, the greater the resistance to uniform corrosion. Figures 2a to c compare the polarization conductance of the material CuAl0.3Zn0.3 in different states (soft / hard) with that of SF-Cu. Unalloyed Cu not only exhibits poorer behavior, but also considerable scatter.
Der Massenverlust ist gegenüber SF-Cu entsprechend Fig. 3 erheblich reduziert.The mass loss is considerably reduced compared to SF-Cu according to FIG. 3.
In allen Fällen Zeigt die erfindungsgemäße Kupfer-Aluminium-Zink-Legierung ein deutlich besseres Verhalten als SF-Cu. Es wird nicht nur die Deckschichtqualität verbessert, sondern auch die Bildungsgeschwindigkeit beeinflußt und vor allem der Potentialbereich der Korrosionsbeständigkeit ausgedehnt. Durch diese Ausbildung der Passivschicht wird die Cu-Löslichkeit deutlich herabgesetzt.In all cases, the copper-aluminum-zinc alloy according to the invention shows a significantly better behavior than SF-Cu. Not only is the quality of the covering layer improved, but also the rate of formation is influenced and, above all, the potential range of corrosion resistance is expanded. This formation of the passive layer significantly reduces the Cu solubility.
Es ist weiterhin als entscheidender Vorteil anzusehen, daß durch die Kombination der Zwangskomponenten Al und Zn der pH-Wert-Bereich für die Bildung von Deckschichten erweitert wird. Während Al gemäß dem Pourbaix-Diagramm fähig ist, auch in sauren Medien Reaktionsprodukte zu bilden und somit zum Aufbau einer wirksamen Schutzschicht beizutragen, gilt entsprechendes für Zn in alkalischen Medien. Beide Zusätze stabilisieren sich wechselseitig und sind in der Lage, gemeinsam im System Cu-Al-Zn einen verhältnismaßig weiten pH-Wert-Bereich abzudecken. Somit sind die die Erfindung betreffenden Werkstoffe nicht nur in neutralen Wässern einsetzbar. Gewisse pH-Wert-Schwankungen wirken sich nicht negativ auf das Korrosionsverhalten aus.It is also to be regarded as a decisive advantage that the combination of the compulsory components Al and Zn extends the pH range for the formation of cover layers. According to the Pourbaix diagram, Al is capable of forming reaction products in acidic media and thus contributing to the formation of an effective protective layer, the same applies to Zn in alkaline media. Both additives stabilize each other and are able to cover a relatively wide pH range together in the Cu-Al-Zn system. The materials relating to the invention can thus not only be used in neutral waters. Certain pH fluctuations do not have a negative effect on the corrosion behavior.
Verschiebt sich das Durchbruchpotential außerdem so weit in positive Richtung, daß es sich nicht mehr im Bereich des freien Korrosionspotentials befindet, so liegt ein zusätzlicher Schutz gegen Elementbildung wie z. B. Kontakt- oder Belüftungselemente vor. Zudem konnte bei den überprüften Rohrmustern keine Lochfraßgefährdung festgestellt werden.If the breakthrough potential also shifts so far in the positive direction that it is no longer in the area of the free corrosion potential, additional protection against element formation such as e.g. B. contact or ventilation elements. In addition, no risk of pitting was found in the tube samples checked.
Claims (11)
0,1 - 1,0 % Aluminium; 0,1 - 1,0 % Zink;
Rest Kupfer und üblichen Verunreinigungen,
als korrosionsbeständiger Werkstoff für Rohre in der Installations- und Sanitärtechnik und auf dem Trinkwassersektor.Use of a copper-aluminum-zinc alloy consisting of
0.1-1.0% aluminum; 0.1-1.0% zinc;
Remainder copper and usual impurities,
as a corrosion-resistant material for pipes in installation and sanitary engineering and in the drinking water sector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4213487 | 1992-04-24 | ||
| DE19924213487 DE4213487C1 (en) | 1992-04-24 | 1992-04-24 | Use of a copper-aluminum-zinc alloy as a corrosion-resistant material |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0566978A2 true EP0566978A2 (en) | 1993-10-27 |
| EP0566978A3 EP0566978A3 (en) | 1993-12-29 |
| EP0566978B1 EP0566978B1 (en) | 1995-06-28 |
Family
ID=6457380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19930106091 Expired - Lifetime EP0566978B1 (en) | 1992-04-24 | 1993-04-15 | Use of a copper-aluminium-zinc alloy as corrosion resistant material |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0566978B1 (en) |
| DE (2) | DE4213487C1 (en) |
| DK (1) | DK0566978T3 (en) |
| ES (1) | ES2075740T3 (en) |
| FI (1) | FI102621B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013004081A1 (en) * | 2013-03-11 | 2014-09-11 | Hansa Metallwerke Ag | Sanitary fitting body |
Families Citing this family (2)
| 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 |
| DE19606162C2 (en) | 1996-02-20 | 2003-01-30 | Wieland Werke Ag | Use of a copper-aluminum-zinc alloy as a corrosion-resistant material |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61231131A (en) * | 1985-04-05 | 1986-10-15 | Kobe Steel Ltd | Corrosion resistant copper alloy pipe |
| JPS61270579A (en) * | 1985-05-27 | 1986-11-29 | 古河電気工業株式会社 | Corrosion-resistant feed water copper pipe |
| JPH01316431A (en) * | 1988-06-15 | 1989-12-21 | Furukawa Electric Co Ltd:The | Corrosion-resistant copper alloy pipe for piping of refrigerant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5675541A (en) * | 1979-11-22 | 1981-06-22 | Sumitomo Light Metal Ind Ltd | Copper alloy for water or hot water supply piping material and heat exchanger tube material |
-
1992
- 1992-04-24 DE DE19924213487 patent/DE4213487C1/en not_active Expired - Fee Related
-
1993
- 1993-04-15 DE DE59300302T patent/DE59300302D1/en not_active Expired - Lifetime
- 1993-04-15 DK DK93106091T patent/DK0566978T3/en active
- 1993-04-15 ES ES93106091T patent/ES2075740T3/en not_active Expired - Lifetime
- 1993-04-15 EP EP19930106091 patent/EP0566978B1/en not_active Expired - Lifetime
- 1993-04-23 FI FI931829A patent/FI102621B/en not_active IP Right Cessation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61231131A (en) * | 1985-04-05 | 1986-10-15 | Kobe Steel Ltd | Corrosion resistant copper alloy pipe |
| JPS61270579A (en) * | 1985-05-27 | 1986-11-29 | 古河電気工業株式会社 | Corrosion-resistant feed water copper pipe |
| JPH01316431A (en) * | 1988-06-15 | 1989-12-21 | Furukawa Electric Co Ltd:The | Corrosion-resistant copper alloy pipe for piping of refrigerant |
Non-Patent Citations (3)
| Title |
|---|
| Week 8648, Derwent Publications Ltd., London, GB; AN 86-314306 & JP-A-61 231 131 (KOBE STEEL KK) 15. Oktober 1986 * |
| Week 8731, Derwent Publications Ltd., London, GB; AN 87-215916 & JP-A-61 270 579 (FURUKAWA ELECTRIC CO) 29. November 1986 * |
| Week 9006, Derwent Publications Ltd., London, GB; AN 90-040228 & JP-A-1 316 431 (FURUKAWA ELECTRIC CO) 21. Dezember 1989 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013004081A1 (en) * | 2013-03-11 | 2014-09-11 | Hansa Metallwerke Ag | Sanitary fitting body |
| DE102013004081B4 (en) | 2013-03-11 | 2023-06-07 | Hansa Metallwerke Ag | Sanitary fitting body |
Also Published As
| Publication number | Publication date |
|---|---|
| FI931829A0 (en) | 1993-04-23 |
| FI102621B1 (en) | 1999-01-15 |
| EP0566978A3 (en) | 1993-12-29 |
| FI931829A (en) | 1993-10-25 |
| ES2075740T3 (en) | 1995-10-01 |
| DE4213487C1 (en) | 1993-11-18 |
| DE59300302D1 (en) | 1995-08-03 |
| FI102621B (en) | 1999-01-15 |
| DK0566978T3 (en) | 1995-11-06 |
| EP0566978B1 (en) | 1995-06-28 |
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