Sep 13 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Forging Hot Working Cold Working Annealing
Introduction
The copper alloy UNS C42500 is a brass alloy of copper, zinc and tin. High electrical and thermal conductivity enables UNS C42500 to be used in heat exchanger tubing. UNS C42500 copper alloy is preferred for water fittings due to its anti-corrosive nature. Excellent cold working characteristic of UNS C42500 makes it suitable for machining.
The following datasheet provides the chemical composition and properties of UNS C42500 copper alloy.
Chemical Composition
The chemical composition of UNS C42500 is tabulated below.
| Element |
Content (%) |
| Copper, Cu |
88.5 |
| Tin, Sn |
2.0 |
| Zinc, Zn |
9.5 |
Physical Properties
The following table summarizes the physical properties of UNS C42500 copper alloy.
| Properties |
Metric |
Imperial |
| Density |
8.78 g/cm3 |
0.317 lb/in3 |
| Melting point |
1010 - 1030°C |
1850 - 1890°F |
| Solidus |
1010°C |
1850°F |
| Liquidus |
1030°C |
1890°F |
Mechanical Properties
The mechanical properties of UNS C42500 are tabulated below.
| Properties |
Metric |
Imperial |
| Tensile strength |
310 - 634 MPa |
45000 - 92000 psi |
| Yeild strength |
124 - 524 MPa |
18000 - 76000 psi |
| Elongation at break |
49.00% |
49.00% |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Thermal Properties
The following table details the thermal properties of UNS C42500 copper alloy.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@Temperature 20.0-100 °C ) |
18.4 µm/m°C |
10.2 µin/in°F |
| Thermal conductivity (@Temperature 20.0 °C ) |
120 W/mK |
833 BTUin/hr.ft²°F |
| Specific heat capacity |
0.380 J/g°C |
0.0908 BTU/lb°F |
Other Designations
Designations commonly used for UNS C42500 include:
Fabrication and Heat Treatment
Machinability
UNS C42500 copper alloy has a machining rate of 30.
Welding
The recommended welding processes for UNS C42500 include soldering, brazing, oxyacetylene welding, gas shielded arc welding and butt welding. Coated metal arc welding, spot welding and seam welding are not preferred for UNS C42500 copper alloy.
Forging
The forging temperatures of UNS C42500 range between 790 and 840ºC (1455 and 1545ºF).
Hot Working
The hot forming of UNS C42500 copper alloy is rated as fair.
Cold Working
UNS C42500 produces excellent results when cold worked.
Annealing
UNS C42500 copper alloy is annealed at temperatures ranging between 426 and 704ºC (800 and 1300ºF).