Sep 13 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 UNS C91700 copper alloy.
Chemical Composition
The chemical composition of UNS C91700 copper alloy is tabulated below.
|
Element |
Content (%) |
|
Cu |
85.0-87.5 |
|
Sn |
11.3-12.5 |
|
Ni |
1.30-2.0 |
|
P |
0.30 |
|
Pb |
0.25 |
Physical Properties
The following table shows physical properties of UNS C91700 copper alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.75 g/cm3 |
0.316 lb/in³ |
Mechanical Properties
The mechanical properties of UNS C91700 copper alloy are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Hardness, Brinell |
85 |
85 |
|
Tensile strength |
305 MPa |
44200 psi |
|
Yield strength |
150 MPa |
21800 psi |
|
Elongation at break (in 50 mm) |
16% |
16% |
|
Elastic modulus |
117 GPa |
17000ksi |
|
Machinability (UNS C36000 (free-cutting brass) = 100) |
20 |
20 |
|
Poisson's ratio |
0.34 |
0.34 |
Thermal Properties
The thermal properties of UNS C91700 copper alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@ 20-200°C/68-392°F) |
16.2 µm/m°C |
9.00 µin/in°F |
|
Thermal conductivity (@ 20°C/68°F) |
71.0 W/mK |
493 BTU in/hr.°F |
Other Designations
Other designations that are equivalent to UNS C91700 copper alloy include:
Machinability
The machinability rating of UNS C91700 copper alloy is 20.
Welding
UNS C91700 copper alloy can be welded using brazing, soldering, carbon arc welding, coated metal arc welding, oxyacetylene welding, and gas shielded arc welding methods.
Heat Treatment
UNS C91700 copper alloy can be stress relieved at 260°C (500°F). The time taken for stress relieving is about 1hr/ in. of section thickness. It does not respond to heat treatment.