Equivalent designations UNS K93600 W. Nr. 1.3912 Form ASTM Sheet, bar, plate, tube and strip ect B 388, B 753 Chemical composition % Fe Ni C Mn Si P S Co Cr min balance 35 max 37 0.15 0.60 0.40 0.025 0.025 0.50 0.25 Physical properties Density 8.11 g/cm3 Melting point 1430℃ Features: Invar 36 is a 36% nickel-iron alloy notable for its uniquely low coefficient of thermal expansion which is roughly one-tenth that of carbon steel in the range from room temperature to around 200℃. It also retains good strength and toughness at cryogenic temperatures. It can be hot and cold formed and machined using processes similar to austenitic stainless steels. Applications: Invar 36 is useful for applications where high dimensional stability is required such as standards of length, precision optical and laser system, cryogenic components. It is also used in conjunction with high expansion alloys in applications in bimetallic thermostats. Note: Invar 36 is a registered trademark of Carpenter Technology Corporation. Invar is a trademark of Imphy Alloys.