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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/F @ 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.