Sep 21 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat Treatment Annealing Cold Working Welding Forging Machinability Hot WorkingApplications
Introduction
Architectural bronze alloys enhance the inside and outside appearances of buildings and last for a long time. They are available in many forms and are generally completed by waxing.
UNS C38500 architectural bronze alloys have a yellow-gold color. The following datasheet provides an overview of UNS C38500 bronze alloys.
Chemical Composition
The chemical composition of UNS C38500 architectural bronze alloys is outlined in the following table.
| Element |
Content (%) |
| Cu |
57.0 |
| Pb |
3.0 |
| Zn |
40.0 |
Physical Properties
The following table shows the physical properties of UNS C38500 architectural bronze alloys.
| Properties |
Metric |
Imperial |
| Density |
8.47 g/cm3 |
0.306 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C38500 architectural bronze alloys are displayed in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell B (M30 temper) |
65 |
65 |
| Tensile strength (M30 temper) |
415 MPa |
60200 psi |
| Yield strength (@strain 0.500%, M30 temper) |
140 MPa |
20300 psi |
| Elongation at break (in 50 mm, M30 temper) |
30.00% |
30.00% |
| Machinability (UNS C36000 (free-cutting brass) = 100) |
90 |
90 |
| Shear modulus |
37.0 GPa |
5370 ksi |
| Shear strength (M30 temper) |
240 MPa |
34800 psi |
| Poisson's ratio |
0.34 |
0.34 |
| Elastic modulus |
117 GPa |
16969 ksi |
Thermal Properties
The thermal properties of UNS C38500 architectural bronze alloys are given in the following table.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-300°C/68-572°F) |
20.9 µm/m°C |
11.6 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
123 W/mK |
854 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to UNS C38500 architectural bronze alloys are ASTM B455 alloys.
Fabrication and Heat Treatment
Annealing
UNS C38500 architectural bronze alloys are annealed between 427 and 593°C (800 and 1100°F).
Cold Working
UNS C38500 bronze alloys have poor cold working capacity.
Welding
Brazing and soldering processes are recommended for UNS C38500 bronze alloys. Welding processes not recommended for these alloys include spot welding, gas shielded arc welding, seam welding, coated metal arc welding and oxyacetylene welding
Forging
UNS C38500 bronze alloys can be forged between 621 and 732°C (1150 and 1350°F).
Machinability
UNS C38500 bronze alloys have a machinability rating of 90.
Hot Working
UNS C38500 bronze alloys have excellent hot forming capacity.
Applications
UNS C38500 architectural bronze alloys are used for trim and architectural hardware.