Oct 3 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesThermal propertiesOther DesignationsFabrication and Heat Treatment Machinability Welding
Introduction
Bronze – copper casting alloy UNS C90300 is a cast alloy of copper-tin. Bronze is used in architecture for its attractive colour and longevity.
The following datasheet provides chemical composition and properties of UNS C90300 Bronze alloy.
Chemical Composition
The chemical composition of UNS C90300 alloy is given in the following table.
| Element |
Content (%) |
| Cu |
88 |
| Sn |
8 |
| Zn |
4 |
Physical Properties
The following table details the physical properties of UNS C90300 alloy.
| Properties |
Metric |
Imperial |
| Density |
8.75 g/cm3 |
0.316 lb/in³ |
Mechanical Properties
The mechanical properties of the UNS C90300 alloy are shown in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Brinell |
70 |
70 |
| Tensile strength |
310 MPa |
45000 psi |
| Yield strength |
145 MPa |
21000 psi |
| Elongation at break |
30.00% |
30.00% |
| Machinability
| 30
| 30 |
| Charpy impact |
19.0 J |
14.0 ft.lb |
| Elastic modulus |
117 GPa |
16969 ksi |
| Poisson's ratio |
0.34 |
0.34 |
Thermal properties
The following table discusses the thermal properties of UNS C90300 alloy.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@20-177°C/68-351°F) |
18.0 µm/m°C |
10.0 µin/in°F |
| Thermal conductivity(@20.0°C/68°F) |
74.0 W/mK |
514 BTUin/hr.ft².°F |
Other Designations
Equivalent designations to UNS C90300 alloy include:
- ASTM B271
- ASTM B30
- ASTM B505
- ASTM B584
- ASTM B763
- MIL C-11866
- QQ C390
- SAE J461
- SAE J462
Fabrication and Heat Treatment
Machinability
UNS C90300 alloy has a machinability rating of 30.
Welding
The preferred welding techniques for UNS C90300 alloy are soldering, brazing, carbon arc welding, oxyacetylene welding, gas shielded arc welding and coated metal arc welding.