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Invar

Alloy of nickel and iron with low coefficient of thermal expansion

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Invar: Alloy of nickel and iron with low coefficient of thermal expansion
Invar, also known generically as FeNi36, is a nickel–iron alloy notable for its uniquely low coefficient of thermal expansion. The name Invar comes from the word invariable, referring to its relative lack of expansion or contraction with temperature changes, and is a registered trademark of ArcelorMittal.

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