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.
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.
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
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.