Copper Nickel

C71500 Copper Nickel

Specs: MIL-C-15726 MIL-T-15005 ASTM-B-151 MIL-C-24679
UNS# C71500

C71500 Copper Nickel, also known as 70/30 Copper Nickel, offers excellent corrosion resistance, especially in marine saltwater environments. The main wrought Copper Nickel alloys chosen for sea water service contain 10% or 30% Nickel. They also have important additions of Iron and Manganese which are necessary to maintain good corrosion resistance.


Some common applications for Copper Nickel include valves, pump components, fittings, flanges, and various other marine hardware components.


Copper Nickel C71500 (CuNi30MnFe1) is a copper nickel alloy with limited additions of manganese and iron to increase the strength. Copper Nickel 70/30 is also insensitive to stress corrosion.


Although this alloy was already known by the Chinese in the 9th Century, it did not become popular until the 1920’s when it was developed for naval applications in seawater condenser systems.


The addition of iron helps grain refining and increases the erosion resistance with flowing seawater.


It retains its strength well at moderately elevated temperatures, has good cold and hot working properties, and is easily weldable.


The alloy is now used in a wide spectrum of applications, ranging from piping for seawater, cladding for offshore platforms and underwater cages for fish farming.


Being high in copper Copper Nickel 70/30 has anti-bio-fouling properties in seawater, and more recently, has been proven to have anti-microbial applications in hospital environments to combat the spread of viral bacteria.

Available shapes –  round, rectangular, and sleeve


Related Products


Chemical and Marine

  • Tube and Tube Plates For Heavy Duty Water Condensers
  • Heat Exchanges
  • Desalination Plants
  • Feed Water Heaters and Evaporators in Power Stations
  • Sugar Refining Plants
  • Condenser Systems
  • Fish Cages
  • Cooling-Water Circuits and Sanitary Services on-board Ship
  • Fire Sprinkler Systems for Ships
  • Hydraulic And Pneumatic Piping
  • Under Water Sheathing
  • Ship Building
  • Oil Well Pump Liners
  • Salt Water Pumps and Piping for Submarines and Naval Surface Ships
  • Bourdon Tubes
  • Hydraulic Fluid Pipes Operating Under Corrosive Environments
  • Wave and Tidal Energy Generation Equipment


  • Fasteners

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Specifications Copper Nickel C71500

Tube & Pipe
Welded & Seamless
Sheet & Plate Strip Rod, Bar
& Profile
Wire Forgings
ASTM B 111
ASTM B 359
ASTM B 395
ASTM B 466
ASTM B 467
ASTM B 543
ASTM B 552
ASTM B 608
ASTM B 956
ASTM B 122
ASTM B 171
ASTM B 122 ASTM B 151
ASTM B 124
ASTM B 122
  ASTM B 283
ASME         ASME SB 151    
SAE         SAE J461
SAE J463
Military         MIL-C-15726
EN 12451
CW 354H
  EN 1652
EN 1653
EN 1652 EN 12163
EN 12164
  EN 12165
EN 12420
DIN 17664
DIN 17671-1
DIN 17679
DIN 1785
DIN 17670-1
DIN 17675-1
DIN 17670-1 DIN 17672-1    
British Standard
CN 107 BS 2871-2
BS 2871-3
BS 2870
BS 2875
BS 2870 BS 2872
BS 2874
Def Stan 02 780
  Def Stan 02 780
NF A 51-115
NF A 51-112
NF A 51-102 NF A 51-115
NFA 51-112
NFA 51-112 GAM MM11    
JIS H 3320
C7150 JIS H 3300
JIS H 3320
JIS H 3100        
GOST 00492
China BFe30-1-1            
AS 2738-2
715 AS 1569
AS 1572
      AS/NZS 1573  
ISO 429
CuNi30Mn1Fe ISO 1635
ISO 1635-2
ISO 1534-2 ISO 1534-1 ISO 1637    

Registered with the USA EPA as an Antimicrobial Alloy.

Mechanical Properties

Mechanical Properties of Copper Nickel C71500

Product Form Condition Size
Imperial metric
Ksi   N/mm²
0.5% Yield
Ksi   N/mm²
Rod & Bar
ASTM B 151
060 soft anneal <=0.5” (<=12mm) >0.5-1” (>12-25.4mm)
>1” (>25.4mm)
52-60   358-414
48-58   331-400
45-52   310-358
18-26   124-179
18-24   124-165
18-22   124-152
Physical Properties

Physical Properties Copper Nickel C71500

Physical Properties Imperial Units Physical Metric Units
Density 0.323 lb/in³ 8.94g/cm³
Melting Range 2260-2140ºF 1170-1240ºc
Hot Working Range 1695-1875 ºF 925- 1025 ºc
Mean Liner Expansion
  0.0162 ºc x10-³
Mean Liner Expansion
68-572 ºF
0.009 ºF x10-³  
Specific Heat 0.090Btu/lb/ ºF @68ºF 377J/kg ºK @20 ºc
Thermal Conductivity 17Btu /ft²/fth ºF @68ºF 29W/m. ºK
Electrical Conductivity 5% IACS @68ºF 0.029MS/cm@20 ºc
Electrical Resistivity 14.72µΩin 37.4 μΩcm
Modulus of Elasticity 10³    
Tension 22ksi 152N/mm²
Rigidity 8.3ksi 57. N/mm²

While the data is believed to be accurate, Wieland Diversified makes no representation or warranty of any kind (expressed or implied) and assumes no responsibility with respect to the accuracy and values shown above; this information should only be used as a guide.

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