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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/F @ 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
  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.

© 1998 Conex Metals.

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