Common Trade names: Nilo 36, Invar 36, Pernifer 6, Invar 6, Nilo6

36NiFe wire has negligible change in its dimensions over the higher temperature ranges up to 500°C. It retains its mechanical properties and hardness at cryogenic temperature ranges and used as a component in the bimetallic strip.

Chemical composition

Iron FeBal. NickelNi35.0-37.0%

Mechanical property

Alloy State Tensile Strength, N/mm² Yield Strength, N/mm² Elongation, %
Wire 490.00 240.00 42.00

Physical properties

Density 8.11 g/cm3
Melting point 1430 °C
Inflection point 220 °C
Thermal conductivity 10.0 W/m•°C
Coefficient of expantion 11.5 μm/m °C (20 - 100°C)
2.6 μm/m °C (20 - 200°C)


  • almost stable dimensions at various temperature ranges
  • hardness
  • large yield strength
  • high tensile strength


  • dual metallic strip