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List of Alloys & profiles

List of Alloys & profiles

Alloy Wire International

Datasheet: Nilo® 42

Nilo® 42

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).

Nilo® 42 is also known as Invar 42, Pernifer 40, Dilaton 42, and Glass Sealing 42.

Available in all profile options

Nilo® 42 - Alloy Wire International 1

Key Features

Nilo® 42 offers the following key features:

Low and nominally constant coefficient of thermal expansion from room temperature to about 300°C (570°F).

Typical Applications

Nilo® 42 is known to be suitable for the following applications:

Semiconductor lead frames
Thermostat rods
Various glass to metal seals


Designations

W.NR 1.3917
UNS K94100
AWS 091

Specifications

ASTM F30

Chemical Composition

The chemical composition of Nilo® 42 is indicated in the table below:

ElementMin %Max %
Ni41.00 nominal
Febal
Mn0.80
Si0.30
C0.05
Cr0.25
P0.03
S0.03
Al0.10

Alloy Details

Nilo® 42 density, melting point, inflection point, thermal conductivity, and coefficient of expansion is indicated in the table below:

DensityMelting PointInflection PointThermal ConductivityCoefficient of Expansion
8.11 g/cm³
1435 °C
370 °C
10.5 W/m• °C
5.3 µm/m °C (20 – 100 °C)
4.5 – 6.5 µm/m °C (20 – 300 °C)
0.293 lb/in³

2615 °F

700 °F

72.8 btu•in/ft2•h °F

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 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.

The typical heat treatment of Nilo® 42:

TypeTemperatureTimeCooling
Anneal850 – 1000 °C (1560 – 1830 °F)0.5 HrAir or water

Properties

The typical mechanical properties of Nilo® 42:

Annealed
Approx. tensile strength<600 N/mm²<87 ksi
Approx. operating temperatureup to +300 °Cup to +570 °F
Hard Drawn
Approx. tensile strength700 – 900 N/mm²102 – 131 ksi
Approx. operating temperatureup to +300 °Cup to +570 °F

The above tensile strength ranges are typical. If you require different please ask.

*Trade name of Special Metals Group of Companies