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一种称为IN838或CA722的新铜镍合金大大提高了抗海水冲击的腐蚀,由国际镍公司发展用于热交换器,管路系统以及其他由于紊流以至限制了铜镍合金的适用性的地方。名义成分是Ni～15Cu,附加0.3～0.7%Cr,以改善对流动海水的抗蚀性。按照国际镍公司(Inco)的规定该合金可用于进水速度高达6.7米/秒的冷凝器中,较常用韵Cu-10Ni(CA706)合金的最大设计流速约大2.5倍。该新合金有希望以更高的流速应用于更均匀流动模式和较低的剪切应力的地方,如大口径的管路和船壳。IN838合金的第一个用处是盐水冷却的空调系统。
A new copper-nickel alloy, called IN838 or CA722, greatly increases the resistance to seawater attack and is developed by Nickel International for use in heat exchangers, piping, and other applications that limit the applicability of copper-nickel alloys due to turbulence local. The nominal composition is Ni ~ 15Cu with 0.3 ~ 0.7% Cr added to improve the corrosion resistance of flowing seawater. According to International Nickel Corporation (Inco), the alloy can be used in condensers with water inflow rates as high as 6.7 m / s, about 2.5 times greater than the maximum design flow rate of the popular Cu-10Ni (CA706) alloy. The new alloy is promising for higher flow rates for more uniform flow patterns and lower shear stresses, such as large diameter pipes and hulls. The first use of the IN838 alloy is a brine-cooled air conditioning system.