: Specifications > Invar
Typical Analysis in Percent
Ni 35.0 - 38.0

Cr

 0.25

Mn

 0.50

Si

 0.25
Al 0.10 Mg 0.10
Zr 0.10 Ti 0.10
P 0.02 S 0.02
Fe Balance    
Physical Properties (Annealed):
Specific Gravity: 8.08
Density: 0.292 lb/in
Electrical Resistivity: 494 ohms/mil/ft
Temperature Coefficient of Electrical Resistivity: 0.67 x
10 -3 /℉
Melting Point: 00 ℉
Curie Temperature: 530 ℉
Inflection Temperature: 375 ℉
Modulus of Elasticity: 21.0 psi x
10 -6
Properties:
Typical Tensile Strength (1000 psi):
Annealed: 85 Maximum
¼ Hard: 105 to 125
½ Hard: 50,000 psi
Hard: 120 Minimum

Typical Hardness, Rockwell B:
Annealed: 70 Maximum
¼ Hard: 78 to 83
½ Hard: 84 to 88
Typical Coefficient of Thermal Expansion:
Temp. Range
in/in/ ℉ x10 -6  

-200 - 0 ℉

 1.1
0 - 200 ℉ 0.7
200 - 400 ℉ 1.5
400 - 600 ℉ 6.4
600 - 800 ℉ 8.6
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