Copper Alloy No. C97600
Nickel Silver CDA 976 , Dairy Metal , 20% Leaded Nickel Silver
ASTM B 505 , ASTM B 271
Chemical Composition % by weight
Element Nominal Minimum Maximum Aluminum - - .005 Antimony - - .25 Copper 65 63 67 Iron - - 1.5 Lead 4 3 5 Manganese - - 1 Nickel 20.3 19 21.5 Phosphorus - - .05 Silicon - - .15 Sulfur - - .08 Tin 4 3.5 4.5 Zinc 6 3 9
Applications for Castings
Marine castings, sanitary fittings, ornamental hardware, valves and pumps.
Mechanical Properties
Typical for 3" dia. continuous cast bar
Hardness* Brinell Hardness (500 kg load) 80 Tensile Strength** KSI 45 Yield Strength ** KSI (0.5% Ext. under load) 24 Elongation** % in 2 inch 20 **Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity BTU/ (sq ft-ft-hr-F) 13 Specific Heat BTU/lb/ºF @ 68F .09 Thermal Expansion Per °F from 68 F to 572 F .0000093 Density lb/cu in @ 68 F .321 Electrical Conductivity* (Annealed) % IACS @ 68 F 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) 70 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.