Sep 13 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability 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 will provide details about UNS C72500 tin-bearing copper nickel alloy.
Chemical Composition
The following table shows the chemical composition of UNS C72500 tin-bearing copper nickel alloy.
| Element |
Content (%) |
| Cu |
88.2 |
| Ni |
9.5 |
| Sn |
2.3 |
Physical Properties
The physical properties of UNS C72500 tin-bearing copper nickel alloy are outlined in the following table.
| Properties |
Metric |
Imperial |
| Density |
8.89 g/cm3 |
0.321 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C72500 tin-bearing copper nickel alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Tensile strength |
379-827 MPa |
55000-120000 psi |
| Yield strength (depending on temper) |
152-745 MPa |
22000-108000 psi |
| Elongation at break (in 25.4 mm) |
35% |
35% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson’s ratio |
0.34 |
0.34 |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
| Shear modulus |
52.0 GPa |
7540 ksi |
Thermal Properties
The thermal properties of UNS C72500 tin-bearing copper nickel alloy are tabulated below.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-300°C/68-572°F) |
16.5 µm/m°C |
9.17 µin/in°F |
| Thermal conductivity (@20°C/ 68°F ) |
55 W/mK |
382 BTU in/hr.ft².°F |
Other Designations
Equivalent material to UNS C72500 tin-bearing copper nickel alloy is ASTM B122.
Fabrication and Heat Treatment
Machinability
The machinability rate of UNS C72500 tin-bearing copper nickel alloy is 20.
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 C72500 alloy.
Hot Working
The hot working capacity of UNS C72500 tin-bearing copper nickel alloy is excellent with the recommended hot working temperature ranging between 760 and 816°C (1550 and 1750°F).
Cold Working
The cold working capacity of UNS C72500 is excellent.
Annealing
The annealing temperature of UNS C72500 tin-bearing copper nickel alloy is between 649 and 802°C (1200 and 1475°F).