Aug 21 2012
Topics Covered
IntroductionChemical
CompositionPhysical PropertiesMechanical PropertiesThermal PropertiesOther DesignationsFabrication and Heat
Treatment Machinability Welding
Introduction
High strength yellow brass – copper casting alloy UNS C86500 is a cast alloy
consisting mainly if copper and zinc. UNS C86500 is preferred by
architects for its color and longevity. The lead in the alloy gives it a golden
color where as the manganese gives chocolate brown color.
The following datasheet provides chemical composition and properties
of copper casting alloy UNS C86500.
Chemical Composition
The chemical composition of UNS C86500 is given in the following
table.
| Element |
Content
(%) |
| Copper, Cu |
55.0-60.0 |
| Zinc, Zn |
39.0 |
| Manganese, Mn |
≤1.50 |
| Iron, Fe |
0.4-2.0 |
| Nickel, Ni |
≤1.0 |
| Tin, Sn |
≤1.0 |
| Lead, Pb |
≤0.4 |
| Aluminium, Al |
0.5-1.5 |
Physical Properties
The following table details the physical properties of copper casting alloy
UNS C86500.
| Properties |
Metric |
Imperial |
| Density |
8.30 g/cc |
0.300 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C86500 are shown in the following
table.
| Properties |
Metric |
Imperial |
| Elastic modulus |
117 GPa |
16969 ksi |
| Poisson's ratio |
0.34 |
0.34 |
| Hardness, Brinell |
130 |
130 |
| Tensile strength |
490 MPa |
71100 psi |
| Yeild strength |
195 MPa |
28300 psi |
| Elongation at break |
30.00% |
30.00% |
| Machinability |
26 |
26 |
| Reduction of area |
26.00% |
26.00% |
| Rupture strength |
85.0 MPa |
12300 psi |
| Creep strength |
12.0 MPa |
1740 psi |
| Compressive strength |
165 MPa |
23900 psi |
| Charpy impact |
42.0 J |
31.0 ftlb |
| Fatigue strength |
130-150 MPa |
18900-21800 psi |
Thermal Properties
The following table outlines the thermal properties of copper casting
alloy UNS C86500.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@105°C/221°F) |
18.0 µm/m°C-
| 10.0 µin/in°F |
| Thermal conductivity (@20.0°C/68.0°F ) |
87.0 W/m-K |
604 BTUin/hr.ft².°F |
Other Designations
Equivalent designations to copper alloy UNS C86500 include:
- ASTM B176
- ASTM B30
- ASTM B505
- ASTM B584
- ASTM B763
- QQ C390
- QQ C523
- SAE J461
- SAE J462
Fabrication and Heat Treatment
Machinability
Copper casting alloy UNS C86500 has a machinability rating of 26.
Welding
The preferred welding techniques for UNS C86500 are soldering and
brazing. Carbon arc welding, oxyacetylene welding, gas shielded arc welding and
coated metal arc welding are not recommended for this alloy.