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Copper Nickel Tin, UNS C72800
Categories: Metal; Nonferrous Metal; Copper Alloy

Material Notes: High strength spinodal alloy with excellent corrosion resistance toward seawater. Applications include springs, relay elements, electrical contacts, and marine components.

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Physical PropertiesMetricEnglishComments
Density 8.97 g/cc0.324 lb/in³
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell C 39.539.5Strip hard drawn and aged at 660°F
Tensile Strength, Ultimate 524 MPa76000 psiAnnealed
 1230 MPa179000 psiStrip hard drawn and aged at 660°F
Tensile Strength, Yield 248 MPa36000 psiAnnealed
 1150 MPa167000 psiStrip hard drawn and aged at 660°F
Elongation at Break 8.0 %8.0 %Strip hard drawn and aged at 660°F
 23 %23 %Annealed
Tensile Modulus 128 GPa18500 ksi
 128 GPa18500 ksi
Poissons Ratio 0.350.35Calculated
Machinability 10 %10 %Based on Free cutting brass = 100%
Forgeability 30 %30 %
Shear Modulus 47.2 GPa6840 ksi
 
Electrical PropertiesMetricEnglishComments
Electrical Resistivity 0.0000159 ohm-cm0.0000159 ohm-cm
 
Thermal PropertiesMetricEnglishComments
CTE, linear  13.5 µm/m-°C
@Temperature 20.0 - 100 °C
7.50 µin/in-°F
@Temperature 68.0 - 212 °F
 16.4 µm/m-°C
@Temperature 20.0 - 300 °C
9.10 µin/in-°F
@Temperature 68.0 - 572 °F
Specific Heat Capacity 0.381 J/g-°C0.0910 BTU/lb-°F
Thermal Conductivity 54.8 W/m-K380 BTU-in/hr-ft²-°F
Melting Point 916.7 - 1080 °C1682 - 1980 °F
Solidus 916.7 °C1682 °F
Liquidus 1080 °C1980 °F
Annealing Point 799 - 843 °C1470 - 1550 °F
 
Processing PropertiesMetricEnglishComments
Hot-Working Temperature 649 - 871 °C1200 - 1600 °F
 
Component Elements PropertiesMetricEnglishComments
Copper, Cu 78.72 - 82.9 %78.72 - 82.9 %As Remainder
Iron, Fe <= 0.50 %<= 0.50 %
Lead, Pb <= 0.030 %<= 0.030 %
Magnesium, Mg 0.0050 - 0.15 %0.0050 - 0.15 %
Manganese, Mn 0.050 - 0.30 %0.050 - 0.30 %
Nickel, Ni 9.5 - 10.5 %9.5 - 10.5 %
Niobium, Nb (Columbium, Cb) 0.050 - 0.30 %0.050 - 0.30 %
Tin, Sn 7.5 - 8.5 %7.5 - 8.5 %
Zinc, Zn <= 1.0 %<= 1.0 %

References for this datasheet.

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MC72800b1 / 11771

Specialty Compounds RTP Company

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