C71000 (ASTM B122) Alloy Data Specifications

Cupro-Nickels are among the most attractive, durable and versatile copper alloys available. Offering unique properties such as excellent resistance to biological fouling, corrosion and stress corrosion cracking, these alloys are used in a range of applications from heat exchangers, ship components and condenser tubes of power plants to coinage and even touch surfaces on medical equipment. Nickel additions in these alloys allow designers to benefit from attractive color options ranging from light rose to silver. For more information contact Olin Brass Market Development Engineering at 618-258-5255, OlinBrass.com or email us at info@olinbrass.com.

Chemical Composition

Copper1 Remainder
Nickel2 19.0-23.0%
Iron 1.0% max
Manganese 1.0% max
Zinc 1.0% max
Lead 0.05% max

1Copper plus named elements, 99.5% min

1Nickel values includes Co

Physical Properties

  English Units Metrics Units
Density 0.323 lb/in3 @ 68oF 8.94 g/cm3
Thermal Conductivity 21 BTU-ft/ft2-hr-oF 36 W/mK
Electrical Resistivity 160 ohm circ mils/ft 26.6 microhm-cm
Electrical Conductivity (annealed) 6.5% IACS* .038 megamho/cm
Modulus of Elasticity 20,000,000 psi 138 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 9.1 PPM/oF 16.4 PPM/oC

*International Annealed Copper Standard

Mechanical Properties

Temper1 Tensile Strength Yield Strength2 % Elongation2 Typical 90o Bend Formability GW/BW3
ksi N/mm2 ksi N/mm2
Soft (annealed) 45-53 295-365 21 145 40
1/4 Hard 47-63 325-435 40 275 15
1/2 Hard 56-70 385-485 57 395 5
Hard 67-79 460-545 70 485 2
Extra Hard 72-84 495-580 75 515 1 min
Spring 78-87 540-600 79 545 2 max

1Mechanical properties subject to change. All tempers listed are made to a Tensile Strength specification unless otherwise noted.
2Nominal Values

3Nominal Values in 2" (51mm)

4DATA FOR REFERENCE ONLY. R/T = Bend Radius/Material Thickness <0.016" (0.4mm) thick, 11/16 (17.5mm) wide.