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Low Expansion Nickel-iron Alloy

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Some nickel alloys are selected for their special physical properties. The iron-36% nickel alloy is unique in having almost zero coefficient of thermal expansion around room temperature. The first application was for pendulums of high precision clocks. Today, the largest application is for liquefied natural gas (LNG) tanks. Other alloys in the same family can have their expansion coefficients tailored to match the expansion of the plastics used to encapsulate integrated circuits.
Nickel-iron alloys can also have very high magnetic permeability, making them suitable for shielding electronic equipment from electromagnetic interference. Permanent magnets based on aluminium-nickel-cobalt-iron were widely used but have been superseded in many applications by ferrites and rare-earth magnets.

TTrade Name	Alloy Name	UNS No.	BS Specs	USA Specs	German Specs	French Specs
Alloy K Nilo-K Rodar	Kovar	UNS K94610		ASTM F15 ASTM F26 AMS 7726 Wire AMS 7727 Bar and Forgings AMS 7728 Sheet, Strip and Plate MIL-I-23011 Class 1	WS 1.3981	AFNOR NF A54-301
Alloy 36 Nilo 36 Super Invar 32-5	Invar 36	UNS K93600 UNS K93601 UNS K93603 UNS K93050		ASTM F1684 MIL-S-16598 Tooling plate ASTM B388 Sheet & strip ASTM B753 K93050 Free-cut Invar	WS 1.3912
Nilo 42 Low expansion 42 Alloy	Alloy 42	UNS K94100		ASTM F30 ASTM B 753 AMS 5683 Welding Wire	WS 1.3917	DIN 17745 AFNOR NF A54-301
Low expansion 45 Alloy	Alloy 45
Glass sealing 46 Alloy	Alloy 46	UNS K94600		ASTM F30
High Perm 49	Alloy 4750 Alloy 49	UNS K94840		AMS 7718 Mil-N-14411 Comp 3
Nilo 48	Alloy 48	UNS K94800		ASTM F30
Glass Sealing 52 Alloy	Alloy 52	UNS N14052		ASTM F30

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