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The nickel alloys containing 36-80% nickel are generally used due to their special physical properties, such as low coefficient of thermal expansion and/or magnetic properties.

Higher nickel alloys containing 76-80% nickel with some iron and some molybdenum have the highest magnetic permeability and are used as inductive components in transformers, circuit breakers, low-frequency transducers, relay parts, and screens Alloys with 36% nickel, known as Invar, has extremely low expansion characteristics. Due to its applications in cryogenic environments, this alloy has undergone extensive corrosion testing. The nickel-iron alloys have moderately good resistance to a variety of industrial environments, but are primarily used for their physical characteristics as opposed to corrosion-resistant characteristics.

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