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Datasheet: Nilo® 48

Nilo® 48

A Nickel-Iron, controlled expansion alloy containing 48% Nickel. Its coefficient of thermal expansion was designed to match that of soft lead and soda-lime glasses. This alloy also has a high inflection point.

Nilo® 48 is also known as Invar 48 and Magnifer 50.

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Key Features

Coefficient of thermal expansion designed to match that of soft lead and soda-lime glasses.
High inflection point.

Typical Applications

Industrial thermostats that operate at temperatures up to 450°C (840°F).
Glass to metal seals

Designations

W.NR 1.3922
W.NR 1.3926
W.NR 1.3927
UNS K94800
AWS 092

Specifications

ASTM F30

Chemical Composition

Element	Min %	Max %
Ni	48.00 nominal
Fe	bal
Mn	–	0.80
Si	–	0.30
C	–	0.05
Cr	–	0.25
P	–	0.025
S	–	0.03
Al	–	0.10

Alloy Details

Density	Melting Point	Inflection Point	Thermal Conductivity	Coefficient of Expansion
8.2 g/cm³	1450 °C	460 °C	16.7 W/m• °C	8.5 µm/m °C (20 – 100 °C) 8.3 – 9.3 µm/m °C (20 – 300 °C)
0.296 lb/in³	2640 °F	860 °F	116 btu•in/ft²•h °F	4.7 x 10^-6 in/in °F (70 – 212 °F) 4.6 – 5.2 x 10^-6 in/in °F (70 – 572 °F)

Heat treatment of finished parts

The Nilo alloys are usually supplied and used in the annealed condition (residual cold work distorts the coefficients of thermal expansion). Annealing times may vary due to section thickness.