A Nickel-Iron, low expansion alloy containing 36% Nickel. It maintains near constant dimensions over the range of normal atmospheric temperatures and has a low coefficient of expansion from cryogenic temperatures to about 500oC (930oF). Nilo 36 also retains good strength and toughness at cryogenic temperatures.

Applications include:

  • Standards of Length
  • Thermostat Rods
  • Laser Components
  • Tanks and Piping for the Storage and Transportation of Liquefied Gasses
     
Approximate Chemical Composition
Ni 35-38%
Fe BAL
DENSITY 8.11 g/cm3 0.293 lb/in3
MELTING POINT 1430oC 2610oF
INFLECTION POINT 220°C 430°F
THERMAL CONDUCTIVITY 10.0 W/m•°C 69.3 btu•in/ft2•h°F
COEFFICIENT OF EXPANSION 1.5 µm/m °C
( 20 - 100°C)

2.6 µm/m °C
( 20 - 100°C)

 0.83 x 10-6 in/in °F
( 70 - 212°F)

1.4 x 10-6 in/in °F
( 70 - 392°F)
 

HEAT TREATMENT (AFTER FORMING)
The Nilo alloys are usually used in the annealed condition (residual cold work distorts the coefficients of thermal expansion)
  Anneal at 850 - 1000°C (1560 - 1830°F)
For highest dimensional stability, heat treat as follows: Anneal at 830°C (1525°F) for 30 minutes and water quench, re-heat to 300°C (570°F) for 1 hour and water quench. Finally re-heat to 100°C (212°F) for 48 hours and air cool.
 
CONDITION  

APPROX TENSILE STRENGTH

  

APPROX SERVICE TEMPERATURE
Annealed 450-550 N/mm2 65-80 ksi up to 500oC up to 930oF
Hard Drawn 700-900 N/mm2 102-131 ksi up to 500oC up to 930oF
 
STANDARDS
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