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Ensinger PEI

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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 PropertiesOriginal ValueComments
Density 0.324 lb/in³
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell C 39.5Strip hard drawn and aged at 660°F
Tensile Strength, Ultimate 76000 psiAnnealed
 179000 psiStrip hard drawn and aged at 660°F
Tensile Strength, Yield 36000 psiAnnealed
 167000 psiStrip hard drawn and aged at 660°F
Elongation at Break 8.0 %Strip hard drawn and aged at 660°F
 23 %Annealed
Tensile Modulus 18500 ksi
 1.85e+7 psi
Poissons Ratio 0.35Calculated
Machinability 10 %Based on Free cutting brass = 100%
Forgeability 30 %
Shear Modulus 6840 ksi
 
Electrical PropertiesOriginal ValueComments
Electrical Resistivity 0.0000159 ohm-cm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 7.50 µin/in-°F
@Temperature 20.0 - 100 °C
 9.10 µin/in-°F
@Temperature 20.0 - 300 °C
Specific Heat Capacity 0.0910 BTU/lb-°F
Thermal Conductivity 380 BTU-in/hr-ft²-°F
Melting Point 1682 - 1980 °F
Solidus 1682 °F
Liquidus 1980 °F
Annealing Point 1470 - 1550 °F
 
Processing PropertiesOriginal ValueComments
Hot-Working Temperature 1200 - 1600 °F
 
Component Elements PropertiesOriginal ValueComments
Copper, Cu 78.72 - 82.9 %As Remainder
Iron, Fe <= 0.50 %
Lead, Pb <= 0.030 %
Magnesium, Mg 0.0050 - 0.15 %
Manganese, Mn 0.050 - 0.30 %
Nickel, Ni 9.5 - 10.5 %
Niobium, Nb (Columbium, Cb) 0.050 - 0.30 %
Tin, Sn 7.5 - 8.5 %
Zinc, Zn <= 1.0 %

References for this datasheet.

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MC72800b1 / 11771

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