C70600 (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 surface 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 9.0-11.0%
Iron 1.0-1.8%
Manganese 1.0% max
Zinc 1.0% max
Lead 0.05% max

1Copper plus named elements, 99.5% min

2Nickel values includes Co

Physical Properties

  English Units Metrics Units
Density 0.323 lb/in3 @ 68oF 8.94 g/cm3
Thermal Conductivity 26 BTU-ft/ft2-hr-oF 45 W/mK
Electrical Resistivity 115 ohm circ mils/ft 19.1 microhm-cm
Electrical Conductivity (annealed) 9% IACS* .0522 megamho/cm
Modulus of Elasticity 18,000,000 psi 124 kN/mm2
Coeff. of Thermal Expansion
  68-572oF (20-300oC) 9.5 PPM/oF 17.1 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) 43-50 295-345 19 130 35 - -
1/4 Hard 51-67 350-460 53 365 12 0.5 0.5
1/2 Hard 58-72 400-495 63 435 5 1.0 1.0
Hard 71-83 490-570 75 515 1 min 2.0 2.0
Extra Hard 73-85 505-585 76 525 1 min 2.5 3.0
Spring 78-88 540-604 76 min 525 min 1 max 4.0 5.0

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.