Sep 27 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Introduction
Copper-nickel alloys have very good resistance to biofouling and
marine corrosion, and possess good fabricability. Copper gains more
strength and corrosion resistance when nickel is added to it.
The following datasheet will provide more details about the UNS
C71640 copper nickel (cupronickel) alloy.
Chemical Composition
The following table shows the chemical composition of the UNS C71640
cupronickel-copper nickel alloy.
| Element |
Content
(%) |
| Copper, Cu |
62.15-67.8 |
| Iron, Fe |
1.70-2.30 |
| Lead, Pb |
0.050 |
| Manganese, Mn |
1.50-2.50 |
| Nickel, Ni |
29.0-32.0 |
| Zinc, Zn |
29.0-32.0 |
Physical Properties
The physical properties of UNS C71640 copper nickel alloy are
outlined in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.86 g/cm3 |
0.320 lb/in3 |
Mechanical Properties
The mechanical properties of UNS C71640 cupronickel alloy are
tabulated below.
| Properties |
Metric |
Imperial |
| Tensile strength (annealed) |
434 MPa |
63000 psi |
| Tensile strength (hard drawn-H80
for tubing / rolled-H04 for flat products) |
538 MPa |
81000 psi |
| Yield strength (annealed) |
172 MPa |
25000 psi |
| Yield strength (hard drawn-H80 for
tubing / rolled-H04 for flat products) |
400 MPa |
58000 psi |
| Elongation at break (hard drawn-H80
for tubing / rolled-H04 for flat products) |
4.00% |
4.00% |
| Elongation at break (annealed) |
40.00% |
40.00% |
| Elastic modulus (C71500 annealed) |
152 GPa |
22000 ksi |
| Poisson’s ratio (C71500 annealed) |
0.325 |
0.325 |
| Machinability (based on
free-cutting brass = 100) |
20 |
20 |
| Shear modulus (C71500 annealed) |
57.2 GPa |
8300 ksi |
Thermal Properties
The thermal properties of UNS C71640 copper nickel alloy are
tabulated below.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient
(@20-300°C/68-572°F) |
16.2 µm/m°C |
9 µin/in°F |
| Thermal conductivity |
29.4 W/mK |
204 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to the UNS C71640 copper nickel alloy are:
- ASTM B111
- ASTM B543
- ASTM B552