Reference guide


Product description: Copper-nickel
Solids: 1/2" to 9" O.D.
Tubes: 1 1/8" to 9" O.D.*
Rectangles: Up to 15"
Standard lengths: 144"
Shape/Form: Semi-finished, mill stock or near-net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar

 *Consult mill for wall thickness

Typical uses

Industrial: Fittings, pump bodies, pump fixtures, steam fittings
Marine: Boat parts, elbows/flanges/pump bodies/valves used for sea water corrosion resistance

Similar or equivalent specification

CDA ASTM SAE AMS Federal Military Other
C96400 B505
        70-30 Copper nickel

Chemical composition

Cu% Pb% Fe% P% Ni%1 C% Mn% S% Si% Nb%
Chemical composition according to ASTM B505/B505M-23

1Ni value includes Co.
Note: Cu + sum of named elements, 99.5% min. Single values represent maximums.


Copper alloy UNS No. Machinability rating Density (lb/in3 at 68 °F)
C96400 20 0.323

Mechanical properties

Mechanical properties according to ASTM B505/B505M-23
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Brinell hardness Remarks
ksi MPa ksi MPa % typical BHN  
65 448 35 241 25    

Physical properties

  US Customary Metric
Physical properties provided by CDA
Melting point - liquidus 2260 °F 1238 °C
Melting point - solidus 2140 °F 1171 °C
Density 0.323 lb/in3 at 68 °F 8.94 gm/cm3 at 20 °C
Specific gravity 8.94 8.94
Electrical conductivity 5% IACS at 68 °F 0.029 MegaSiemens/cm at 20 °C
Thermal conductivity 16.4 Btu/sq ft/ft hr/°F at 68 °F 28.4 W/m at 20 °C
Coefficient of thermal expansion 68-572 9 · 10-6 per °F (68-572 °F) 15.5 · 10-6 per °C (20-300 °C)
Specific heat capacity 0.09 Btu/lb/°F at 68 °F 377.1 J/kg at 20 °C
Modulus of elasticity in tension 21000 ksi 144791 MPa

Fabrication properties

Fabrication properties provided by CDA
*Filler metal R CuNi, or E CuNi.
Technique Suitability
Soldering Excellent
Brazing Excellent
Oxyacetylene welding Not recommended
Gas shielded arc welding* Good
Coated metal arc welding* Good
Machinability rating 20

Thermal properties

Thermal properties provided by CDA
*Temperature is measured in fahrenheit.   **For stress relief, solution treatment and annealing - time is measured in hours/inch of thickness. For precipitation heat treatment - time is measured in hours.
Treatment Time*
Solution treatment 0

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