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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 |
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Brazing/Excellent |
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Oxyacetylene Welding/Not
Recommended |
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Carbon Arc Welding/Not
Recommended |
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Gas Shielded Arc Welding/Not
Recommended |
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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.
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