Oct 3 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Welding Hot Working Cold Working Annealing
Introduction
Copper-nickel alloys have excellent 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 provides further information about UNS C72200 chromium-bearing copper nickel alloy.
Chemical Composition
The following table shows the chemical composition of UNS C72200 chromium-bearing copper nickel alloy.
| Element |
Content (%) |
| Cu |
82.0 |
| Ni |
16.0 |
| Cr |
0.5 |
| Fe |
0.8 |
| Mn |
0.5 |
Physical Properties
The physical properties of UNS C72200 chromium-bearing copper nickel alloy are outlined in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.94 g/cm3 |
0.323 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C72200 chromium-bearing copper nickel alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Tensile strength (O61 temper) |
315 MPa |
45700 psi |
| Tensile strength (H04 temper) |
480 MPa |
69600 psi |
| Yield strength (@strain 0.200 %, O61 temper) |
125 MPa |
18100 psi |
| Yield strength (@strain 0.200 %, H04 temper) |
455 MPa |
66000 psi |
| Elongation at break (H04 temper) |
6.00% |
6.00% |
| Elongation at break (O61 temper) |
46.00% |
46.00% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson’s ratio |
0.34 |
0.34 |
| Shear modulus |
55.0 GPa |
7980 ksi |
Thermal Properties
The thermal properties of UNS C72200 chromium-bearing copper nickel alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-300°C/68-572°F) |
15.8 µm/m°C |
8.78 µin/in°F |
| Thermal conductivity (@20°C/ 68°F ) |
34.5 W/mK |
239 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C72200 chromium-bearing copper nickel alloy are:
- ASTM B111
- ASTM B122
- ASTM B171
- ASTM B359
- ASTM B395
- ASTM B466
- ASTM B543
- ASTM B552
Fabrication and Heat Treatment
Welding
Soldering, brazing, oxyacetylene welding, gas shielded arc welding, coated metal arc welding, spot welding, seam welding, and butt welding are considered as suitable for UNS C72200 alloy.
Hot Working
The hot working capacity of UNS C72200 chromium-bearing copper nickel alloy is good with the recommended hot working temperature ranging between 899 and 1038°C (1650 and 1900°F).
Cold Working
The cold working capacity of UNS C72200 is good.
Annealing
The annealing temperature of UNS C72200 chromium-bearing copper nickel alloy is between 732 and 816°C (1350 and 1500°F).