General Description

Alloy 42-6 (ASTM F31 Alloy) is a iron nickel alloy with 6% chromium, it is used primarily for glass sealing applications in electronic devices.

ASTM F31 alloy develops a tight green oxide film during wet hydrogen annealing and finds applications in relatively large glass seals and vacuum tight windows.

Chemical Composition

Grade C% P% S% Mn% Si% Al% Cr% Ni% Fe%
Alloy 42-6 Max 0.05 Max 0.02 Max 0.02 Max 0.25 Max 0.30 Max 0.20 5.40-6.30 41.5-42.5 Bal.


UNS K94760



Wire, Strip, Bar, thin wall tube are available

Physical Properties

Density: 8.15 g/cm3

Melting Point: 1430 °C

Mechanical Properties





Annealed Min 500 Min 177 Min 33 Max 128

Linear Coefficient of Thermal Expansion ā,10-6/℃

Grade 20-100℃ 20-200℃ 20-300℃ 20-400℃ 20-500℃ 20-550℃ 20-600℃
Alloy 42-6 6.8 7.0 7.7 9.7 11.7 11.7 12.2

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