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Cupronickel 70/30 TubesImproved corrosion resistance and almost insensitive to stress corrosion, this alloy will give superior results in high velocity polluted water, including seawater. A reduced thermal conductivity level, but will retain its strength at moderately increased temperatures. Cooling water speed up to 4.5 m/s. In most applications, a cupronickel alloy obtains its corrosion resistance by forming an adherent oxide coating that is preferably formed by clean, oxygenated water, at least initially.