Brass Copper Castings India
C97800 Nickel Silver Bronze


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
Brazing/Excellent
Oxyacetylene Welding/Not Recommended
Carbon Arc Welding/Not Recommended
Gas Shielded Arc Welding/Not Recommended
Coated Metal Arc Welding/Not Recommended