Invar® 36 Alloy Properties

(Also known as Invar, NILO® 36, Pernifer® 36, and Invar Steel)

Invar® 36 Alloy Physical Properties

Density lb/cu in 0.291
Specific Gravity   8.05
Curie Temp °F 535
  °C 279
Melting Point °F 2600
  °C 1427
Electrical Resistivity Micro-ohm-cm 84
  Micro-ohm-cm 495
Thermal Conductivity W/cm °C 0.10
  BTU-in/sq. ft-hr- 72.6
Specific Heat Cal/g- °C 0.123
  BTU/lbm- °F 0.123
Thermal Expansion ppm/°F (75°F to 842°F) 4.9
  ppm/°C (25°C to 450°F) 8.9


Invar® 36 Alloy Mechanical Properties

Tensile Strength ksi 75
  MPa 518
Yield Strength ksi 40
  MPa 276
Elongation % in 2 in. 34
Typical Hardness Ann. Rockwell HRB 80
Modulus of Elasticity Mpsi 20.5
  kMPa 141


Invar® 36 Alloy Chemistry
maximum % unless noted

Iron Bal
Nominal Nickel 36
Nominal Cobalt 0.5
Carbon 0.05
Silicon 0.40
Sulfur 0.015
Chromium 0.25


Invar® 36 Alloy Linear Coefficient of Thermal Expansion

Degree C   Degree C
30-100 1.9 30-450 --
30-150 2.4 30-475 --
30-200 3.0 30-500 10.5
30-250 4.4 30-525 --
30-300 6.1 30-550 --
30-325 -- 30-600 11.8
30-350 7.5 30-700 --
30-375 -- 30-800 --
30-400 8.7 30-900 --
30-425 -- 30-1000 --