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(UNS K93600) 36% nickel-iron alloy. Has a rate of thermal expansion approximately one tenth of carbon steel up to about 400ºF. Used in applications where dimensional changes due to thermal expansion need to kept to a minimum.


Element C Mn Si Ni
INVAR36 0.02% 0.35% 0.20% 36.00%

Physical Constants

Density0.291 lb/in3
Density8.01 g/cm3


Annealing1450ºF then air cool

Viking Forging Parameters

Rings24" O.D. X 6" long500 lbs.
Sleeves16" O.D X 12" long500 lbs.
Disks26" Dia. X 6.5" long500 lbs.
Round Bar12" Dia. X 96" long2600 lbs.
Square/Rectangular Bar12" Square X 96" long2600 lbs.
Blocks14" X 14" X 14"750 lbs.
Shafts12" Dia. X 96" long2600 lbs.

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