Ferrous Alloys

36% Nickel Iron Alloy Invar

Application & Characteristics 
Composite tubing for thermostatic controls.
Sometimes used for glass-to-metal sealing.
Chemical Composition (%)
Ni, Co & Cu 34.50-36.50; C 0.10 max.; Si
0.20-0.35; Balance Fe
Physical Properties
Melting Range (°F)2600
Density (lbs/in³) 68F0.291
Thermal Expansion (in/in °Fx10 to the power of -6)0.7 (0 – 200F)
Electrical Resistivity (ohms/cir mil/ft.) 68F487
Mechanical Properties – Temper = A
Tensile Strength (psi x 10³)80
Yield Strength (psi x 10³)50
Elongation ( % )35
HardnessB85(Rockwell)
Mechanical Properties – Temper = H/2
Tensile Strength (psi x 10³)90
Yield Strength (psi x 10³)70
Elongation ( % )15
HardnessB90(Rockwell)
Mechanical Properties – Temper = H
Tensile Strength (psi x 10³)110
Yield Strength (psi x 10³)90
Elongation ( % )5
HardnessC25(Rockwell)

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