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Precision cupro nickel tubes in CuNi10 & CuNi20
 

What is cupro nickel?
The cupro nickel family belongs to the most corrosion resistant of all copper alloys. They contain over 50 % copper and as the major alloying element up to 45 % nickel. They are resistant to moisture, un-oxidised acids, soaps and saline solutions, organic acids and against dry gases like oxygen, chlorine, chloride, fluoride, sulphur dioxide, and carbon dioxide. Stress corrosion fractures do not occur with these alloys.

In the past this particular ability of resistance to corrosion lead to cupro nickel being used in the production of coinage. The oldest coins which have survived to present day have been dated to 235 BC. They were discovered in Uzbekistan and consisted of a similar alloy to that used for the old 1 DM and 50 pfennig coils, ie approximately 75% Cu and 25 % Ni.

We produce cupro nickel tubes in the alloys of CuNi10 and CuNi20 in coils or in straight lengths. These tubes are finished in accordance with
DIN 1755/17671/17664
DIN EN 12449
and also to special customer requirements.

Designation
Material No.DIN
Material No. EN
Characteristics and uses
CuNi10 Fe 1 Mn
2.0872
CW352H
 Excellent resistance against ero-
sion, cavitation and corrosion par-
ticularly in sea water. Resistant to
alkaline solutions and un-oxidised
acids.
Heat exchangers, condenser tubes,
air conditioning plants, break lines
and desalination plants.
CuNi20
No relevant standard
No relevant standard
 Resistant to corrosive fresh and
sea water. Rivet tubes.

Our current standard production sizes are as follows:

Outside diameter
Wall thickness               
 
0,10
0,15
0,20
0,25
0,30
0,40
0,50
0,75
1,00
1,50
2,00
1
 
 
X
X
X
 
 
 
 
 
 
2
 
 
X
X
X
X
X
 
 
 
 
3
 
 
 
X
X
X
X
X
X
 
 
4
 
 
 
X
X
X
X
X
X
 
 
5
 
 
 
 
X
X
X
X
X
X
 
6
 
 
 
 
X
X
X
X
X
X
X
7
 
 
 
 
X
X
X
X
X
X
X
8
  
 
 
 
 
X
X
X
X
X
X
9
  
 
 
 
 
 
X
X
X
X
X
10
  
 
 
 
 
 
X
X
X
X
X
11
  
 
 
 
 
 
 
X
X
X
X
12
  
 
 
 
 
 
 
X
X
X
X
13
  
 
 
 
 
 
 
X
X
X
X
14
  
 
 
 
 
 
 
X
X
X
X
15
  
 
 
 
 
 
 
 
X
X
X
16
  
 
 
 
 
 
 
 
X
X
X
17
  
 
 
 
 
 
 
 
X
X
X
18
  
 
 
 
 
 
 
 
  
X
X

We are of-course able to produce in between sizes.