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Invar 36 (FeNi36) / 1.3912

Invar 36® is a nickel-iron, low expansion alloy that contains 36% nickel and possesses a rate of thermal expansion approximately one-tenth that of carbon steel. Alloy 36 maintains nearly constant dimensions over the range of normal atmospheric temperatures, and has a low coefficient of expansion from cryogenic temperatures to about 500°F. This nickel iron alloy is tough, versatile and retains good strength at cryogenic temperatures.

Material Data Sheet

ASTM F1684
UNS K93603

Main fields of application

Invar 36 is used mainly for:

  • Aircraft controls
  • Optical & laser systems
  • Radio & electronic devices
  • Composite forming tools & dies
  • Cryogenic components


Chemical composition of Invar 36

Ni C Si Mn S
35.5 - 36.5 0.01 max 0.2 max 0.2 - 0.4 0.002 max
P Cr Co Fe  
0.07 max 0.15 max 0.5 max Balance  

Mechanical properties of Invar 36

Metallurgical Condition Annealed, Descaled  
Yield Strength KSI (MPa) 38 (260) Max
Tensile Strength KSI (MPa) 63 (430) Max
Hardness HB 135
Elongation 50mm >30% (Typical 40%)

Delivery program

Various sizes and tolerances available upon request.

Material Outlet by Hempel

ECONOXX.com offers buyers a new and uncomplicated procurement channel, which also includes small quantities and materials in special alloys at favourable conditions.

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