Mechanical Properties of Cu-Ni Alloy
The addition of nickel to copper improves the alloy's strength and durability. The mechanical properties of copper-nickel alloys show a combination of good tensile strength and excellent ductility when annealed. As solid solution alloys, the 90-10 and 70-30 alloys cannot be age hardened. Higher tensile strength and hardness can only be obtained when the alloys are cold worked. Whereas 90-10 Cu-Ni tubing can have a proof strength of 100-160 N/mm2 when supplied in the annealed condition, this could typically be 345-485 N/mm2 in the as-drawn condition.
Both age hardened Cu-Ni-Al and spinodally strengthened Cu-Ni-Sn alloy systems are able to achieve high strengths matching that of carbon steel.
Typical annealed mechanical properties for copper-nickel alloys are given in Table 1. Minimum mechanical properties for 90-10 Cu-Ni (CW 352H) based on Euronorm Standards are outlined in Table 2. Minimum mechanical properties for 90-10 Cu-Ni (C70600) based on ASTM Standards are outlined in Table 3. Minimum mechanical properties for 70-30 Cu-Ni (CW 354H) based on Euronorm Standards are outlined in Table 4. Minimum mechanical properties for 70-30 Cu-Ni (C71500) based on ASTM Standards are outlined in Table 5.
Note: The following data is for guidance only. Please check values for current design specifications.