Copper
Alloy No. C97800
Nickel
Silver Alloy CDA 978 , 25% Leaded Nickel Silver
ASTM B
505 , ASTM B 271
Chemical
Composition % by weight
|
Element |
Nominal |
Minimum |
Maximum |
|
Aluminum |
- |
- |
.005 |
|
Antimony |
- |
- |
.20 |
|
Copper |
65.5 |
64 |
67 |
|
Iron |
- |
- |
1.5 |
|
Lead |
1.8 |
1 |
2.5 |
|
Manganese |
- |
- |
1 |
|
Nickel |
25.5 |
24 |
27 |
|
Phosphorus |
- |
- |
.05 |
|
Silicon |
- |
- |
.15 |
|
Sulfur |
- |
- |
.08 |
|
Tin |
5 |
4 |
5.5 |
|
Zinc |
2.5 |
1 |
4 |
Applications for Castings
Ornamental and sanitary castings,
valves and valve seats, musical instrument components.
Mechanical Properties
Typical for 3" dia. continuous
cast bar
| Hardness* |
Brinell Hardness
(3000 kg load) |
130 |
| Tensile
Strength** |
KSI |
55 |
| Yield Strength
** |
KSI (0.5% Ext.
under load) |
30 |
| Elongation** |
% in 2 inch |
15 |
**Test values are nominal
approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity |
BTU/ (sq ft-ft-hr-F) |
14.7 |
| Specific Heat |
BTU/lb/ºF @ 68F |
.09 |
| Thermal Expansion |
Per °F from 68 F to 500 F |
.0000097 |
| Density |
lb/cu in @ 68 F |
.320 |
| Electrical Conductivity* (Annealed) |
% IACS @ 68 F |
4.5 |
| Modulus of Elasticity |
KSI |
19,000 |
*Volume basis
Fabrication Practices
| Stress relieving
temperature |
500 F or 260 C |
| Time at temperature |
1 hour per inch of
section thickness |
| Responds to heat
treatment |
No |
| Machinability
rating (Free Cutting Brass=100) |
60 |
| Suitability for
being joined by: |
Soldering/Excellent |
| |
Brazing/Excellent |
| |
Oxyacetylene
Welding/Not Recommended |
| |
Carbon Arc
Welding/Not Recommended |
| |
Gas Shielded Arc
Welding/Not Recommended |
| |
Coated Metal Arc
Welding/Not Recommended |
*Since brazing is performed at
temperatures within the hot-short range, strain must be avoided
during the brazing and cooling of this alloy.
The values listed above represent
reasonable approximations suitable for general engineering use.
Due to commercial variations in composition and to manufacturing
limitations, they should not be used for specification purposes.
See applicable A.S.T.M. specification references.
|
