Nov 12 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Annealing
Cold Working
Welding
Forging
Machinability
Hot Working
Applications
Introduction
Brass is a specific term that refers to a variety of copper-zinc alloys having properties that include electrical and thermal conductivity, strength, hardness, wear-resistance, ductility and corrosion-resistance.
Brasses are available in a wide range of colors such as yellow, red, silver and gold etc. These colored brasses are used by designers and architects to improve the inside and outside appearances of buildings.
UNS C28000 alloys are a type of brass alloys. The following datasheet provides an overview of these brass alloys.
Chemical Composition
The chemical composition of UNS C28000 brass alloys is outlined in the following table.
|
Element |
Content (%) |
|
Cu |
59-63 |
|
Fe |
0.070 |
|
Pb |
0.30 |
|
Zn |
40 |
Physical Properties
The following table shows the physical properties of UNS C28000 brass alloys.
|
Properties |
Metric |
Imperial |
|
Melting point-liquidus |
904°C |
1660°F |
|
Melting point-solidus |
899°C |
1650°F |
|
Density |
8.39 gm/cm3 @ 20°C |
0.303 lb/in3 @ 68°F |
Mechanical Properties
The mechanical properties of UNS C28000 brass alloys are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Hardness, Rockwell F |
78 |
78 |
|
Tensile strength |
360 MPa |
52200 psi |
|
Yield strength |
140 MPa |
20300 psi |
|
Elongation at break (In 50 mm) |
52% |
52% |
|
Machinability (UNS C36000 (free-cutting brass) = 100) |
40 |
40 |
|
Shear modulus |
39 GPa |
5660 ksi |
|
Shear strength |
270 MPa |
39200 psi |
|
Poisson's ratio |
0.34 |
0.34 |
|
Elastic modulus |
117 GPa |
16969 ksi |
Thermal Properties
The thermal properties of UNS C28000 brass alloys are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-300°C/68-572°F) |
20.8 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 UNS C28000 brass alloys are:
-
ASME SB111
-
ASTM B111
-
ASTM B135
Fabrication and Heat Treatment
Annealing
UNS C28000 brass alloys are annealed between 427 and 593°C (800 and 1100°F).
Cold Working
UNS C28000 brass alloys have fair cold working capacity.
Welding
Welding processes recommended for UNS C28000 brass alloys include brazing, soldering, butt welding, oxyacetylene welding, spot welding and gas shielded arc welding. Welding process not recommended for these alloys include seam welding and coated metal arc welding.
Forging
UNS C28000 brass alloys can be forged between 621 and 788°C (1150 and 1450°F). The hot forgeability rating for these alloys is 90.
Machinability
The machinability rating for UNS C28000 brass alloys is 40.
Hot Working
UNS C28000 brass alloys have excellent hot working capacity.
Applications
UNS C28000 brass alloys are used for cold or hot-formed products.