Nov 12 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesOther DesignationsFabrication and Heat Treatment Machinability Welding Forging Hot Working Cold Working AnnealingApplications
Introduction
UNS C22600 jewellery bronze is an alloy of copper and zinc. It has similar characteristics as that of UNS C22000 bronze alloy. Yet it is stronger than C22000 bronze alloy. The following section will discuss in detail about UNS C22600 jewellery bronze, which is UNS C22600 copper-zinc brass.
Chemical Composition
The following table shows the chemical composition of UNS C22600 copper alloys.
| Element |
Content (%) |
| Cu |
87.5 |
| Zn |
12.5 |
Physical Properties
The physical properties of UNS C22600 copper alloys are given in the following table.
| Properties |
Metric |
Imperial |
| Melting point - liquidus |
1035°C |
1895°F |
| Melting point - solidus |
1004°C |
1840°F |
| Density (@20°C/68°F) |
8.77 g/cm3 |
0.317 lb/in3 |
Mechanical Properties
The mechanical properties of UNS C22600 copper alloys are tabulated below.
| Properties |
Conditions |
| T (°C) |
Treatment |
| Poisson's ratio |
0.34 |
25 |
- |
| Elastic modulus |
117 GPa |
25 |
- |
| Tensile strength |
269-669 MPa |
- |
- |
| Yield strength |
76-427 MPa |
25 |
(flat products, wire) |
| Elongation |
46% |
- |
- |
Other Designations
Other designations that are equivalent to UNS C22600 copper alloys include:
Fabrication and Heat Treatment
Machinability
The machinability rating of C22600 copper alloys is 30.
Welding
Welding methods such as soldering, brazing, oxyacetylene welding, gas shielded arc welding, spot welding and butt welding are preferred for C22600 copper alloys. Coated metal arc welding and seam welding are not preferred for this type of alloys.
Forging
C22600 copper alloys are forged at temperatures ranging from 760 to 899°C (1400 to 1650°F).
Hot Working
C22600 copper alloys have good hot working property.
Cold Working
C22600 copper alloys have good cold working property.
Annealing
Annealing of C22600 copper alloys is performed at temperatures ranging from 427 to 760°C (800 to 1400°F).
Applications
The following are the major applications of UNS C22600 copper alloys:
- Cold-formed electrical and hardware components
- Jewellery
- Decorative chain
- Dezincification-resistant fasteners
- Fittings