C71500 (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 29.0-33.0%
Iron 0.4-1.0%
Manganese 1.0% max
Zinc 1.0% max
Lead 0.05% max

1Copper includes Ag; Copper plus named elements, 99.5%

2Nickel values includes Co

Physical Properties

  English Units Metrics Units
Density 0.323 lb/in3 @ 68oF 8.94 g/cm3
Thermal Conductivity 17 BTU-ft/ft2-hr-oF 29 W/moK
Electrical Resistivity 225 ohm circ mils/ft 37.5 microhm-cm
Electrical Conductivity (annealed) 4.6% IACS* 0.0267 megamho/cm
Modulus of Elasticity 22,000,000 psi 152 kN/mm2
Thermal Capacity (Specific Heat) 0.090 Btu/lb/Fo @ 68oF 377.1 J/kg - oC @ 20oC
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 9.0 PPM/oF 16.2 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
Annealed 52 min 360 min 28 195 30 min
1/4 Hard 58-72 400-495 47 325 17
1/2 Hard 66-80 455-550 68 470 6
Hard 75-88 515-605 78 540 3
Extra Hard 80-92 550-635 83 570 2
Spring 84-94 580-650 86 595 1 min

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

3DATA FOR REFERENCE ONLY. R/T = Bend Radius/Material Thickness <0.016" (0.4mm) thick, 11/16 (17.5mm) wide.