A Nickel-Iron, low expansion alloy containing 42% Nickel. It has a
low and nominally constant coefficient of thermal expansion from room
temperature to about 300°C (570°F).

Applications include:

  • Semiconductor Lead Frames
  • Thermostat Rods
  • Various Glass to Metal Seals
     
Approximate Chemical Composition
Ni 42%
Fe BAL
DENSITY 8.11 g/cm3 0.293 lb/in3
MELTING POINT 1435oC 2615oF
INFLECTION POINT 370°C 700°F
THERMAL CONDUCTIVITY 10.5 W/m•°C 72.8 btu•in/ft2•h°F
COEFFICIENT OF EXPANSION 5.3 µm/m °C
( 20 - 100°C)

4.5-6.5 µm/m °C
( 20 - 300°C)

2.9 x 10-6 in/in °F
( 70 - 212°F)

2.5-3.6 x 10-6 in/in °F
( 70 - 572°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)

 
CONDITION  

APPROX TENSILE STRENGTH

 

APPROX SERVICE TEMPERATURE

Annealed 450-550 N/mm2 65-80 ksi up to 300oC up to 570oF
Hard Drawn 700-900 N/mm2 102-131 ksi up to 300oC up to 570oF
 
STANDARDS
ASTM F30
 


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