Jul 16 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Heat Treatment
Applications
Introduction
Nearly 400 different kinds of copper alloys are available. Pure copper has high thermal and electrical conductivity. Tin bronze has high corrosion resistance. It is more ductile and stronger when compared to red and semi red brasses.
The following datasheet gives an overview of UNS C94300 copper alloy.
Chemical Composition
The following table shows chemical composition of UNS C94300 copper alloy.
|
Element |
Content (%) |
|
Copper, Cu |
68.5 - 73.5 |
|
Lead, Pb |
22- 25 |
|
Tin. Sn |
4.50 - 6 |
|
Antimony, Sb |
≤ 0.70 |
|
Nickel, Ni |
≤ 0.70 |
|
Zinc, Zn |
≤ 0.50 |
|
Iron, Fe |
≤ 0.15 |
|
Sulfur, S |
≤ 0.080 |
|
Phosphorus, P |
≤ 0.050 |
Physical Properties
The physical properties of UNS C94300 copper alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Density |
9.29 g/cm3 |
0.336 lb/in3 |
Mechanical Properties
The mechanical properties of UNS C94300 copper alloy are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
185 MPa |
26800 psi |
|
Yield strength (@ 0.500%) |
90.0 MPa |
13100 psi |
|
Poisson's ratio |
0.34 |
0.34 |
|
Elongation at break (in 50 mm) |
10% |
10% |
|
Reduction of area |
8% |
8% |
|
Elastic modulus |
117 GPa |
17000 ksi |
|
Izod impact |
7.00 J |
5.16 ft-lb |
|
Hardness, Brinell |
48 |
48 |
|
Machinability (UNS C36000 (free-cutting brass) = 100) |
80 |
80 |
Thermal Properties
The thermal properties of UNS C94300 copper alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal conductivity (@ 20°C/68°F) |
62.7 W/mK |
435 BTU in/hr.ft2.°F |
Other Designations
Other designations that are equivalent to UNS C94300 copper alloy include:
-
ASTM B271
-
ASTM B30
-
ASTM B505
-
ASTM B584
-
ASTM B66
-
ASTM B763
-
QQ C390
-
SAE J461
-
SAE J462
Fabrication and Heat Treatment
Machinability
The machinability rate of UNS C94300 copper alloy is 80.
Welding
UNS C94300 copper alloy can be welded using soldering and brazing processes. Carbon arc welding, oxyacetylene welding, coated metal arc welding, and gas shielded arc welding techniques are not recommended for welding this alloy.
Heat Treatment
UNS C94300 copper alloy can be stress relieved at 260°C (500°F). The time taken for stress relieving is about 1 hr/ in. of section thickness. It does not respond to heat treatment.
Applications
UNS C94300 copper alloy can be used in high-speed bearings for light loads.