70/30 Cupronickel — highest Ni cupronickel. Better high-velocity seawater erosion resistance than 90/10. For condenser tubes in high-velocity seawater, naval heat exchangers and desalination evaporators.
CuNi30Mn1Fe (EN CW354H / UNS C71500) per EN 12163. 30% Ni gives significantly better erosion-corrosion resistance than 90/10 cupronickel — acceptable flow velocity to 4 m/s vs 3 m/s for 90/10. Better in turbulent flow conditions. Higher cost than 90/10. Standard for naval vessel condenser tubes, high-velocity desalination MSF evaporator tubes and high-flow seawater heat exchangers where 90/10 erosion-corrodes.
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