Nov 12 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Heat Treatment
Introduction
Pure copper has good electrical and thermal conductivity. More than 400 varieties of copper alloys are available. Alloys can be freely formed by copper than most metals.
The following datasheet gives an overview of the UNS C92300 copper casting alloy.
Chemical Composition
The chemical composition of the UNS C92300 copper alloy is outlined in the following table.
|
Element |
Content (%) |
|
Cu |
85.0-89.0 |
|
Sn |
7.0-9.0 |
|
Zn |
2.50-5.0 |
|
Pb |
1.0 |
|
Ni |
1.0 |
|
Sb |
0.25 |
|
Fe |
0.25 |
|
P |
0.050 |
|
S |
0.050 |
|
Si |
0.0050 |
|
Al |
0.0050 |
Physical Properties
The following table shows physical properties of the UNS C92300 copper alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.80 g/cm3 |
0.318 lb/in³ |
Mechanical Properties
The mechanical properties of the UNS C92300 copper alloy are tabulated below.
|
Properties |
Metric |
Imperial |
|
Hardness, Brinell |
70 |
70 |
|
Tensile strength |
275 MPa |
39900 psi |
|
Yield strength (@ 0.500%) |
138 MPa |
20000 psi |
|
Elongation at break (in 50 mm) |
25% |
25% |
|
Modulus of elasticity |
117 GPa |
17000 ksi |
|
Compressive strength (at permanent set of 0.1%) |
69.0 MPa |
10000 psi |
|
Compressive strength (at permanent set of 10%) |
240 MPa |
34800 psi |
|
Izod impact |
18.3 J |
13.5 ft-lb |
|
Machinability (UNS C36000 (free-cutting brass) = 100) |
42 |
42 |
|
Poisson's ratio |
0.34 |
0.34 |
Thermal Properties
The thermal properties of the UNS C92300 copper alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 20-177°C/68-351°F) |
18 µm/m°C |
10 µin/in°F |
|
Thermal conductivity |
75 W/mK |
521 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to the UNS C92300 copper alloy include:
-
ASTM B271
-
ASTM B30
-
ASTM B505
-
ASTM B584
-
ASTM B763
-
QQ C390
-
SAE J461
-
SAE J462
Fabrication and Heat Treatment
Machinability
The machinability rating of the UNS C92300 copper alloy is 42.
Welding
The UNS C92300 copper alloy can be welded using brazing and soldering processes. Carbon arc welding, oxyacetylene welding, coated metal arc welding, and gas shielded arc welding methods
Heat Treatment
The UNS C92300 copper alloy can be stress relieved at 260°C (500°F). The time taken for stress relieving is about 1 hr/ in. section thickness. It does not respond to heat treatment.