General Description

Alloy 42 is a low expansion alloy which is very similar to Invar 36. It has a low expansion up to about 300℃. Principally used as strip for semiconductor lead frames in integrated circuits and bi-metal strip, the alloy can be also used in ceramic to metal seals with alumina and the glass bulb envelope to metal seals.

Chemical Composition

Grade C% P% S% Mn% Si% Al% Co% Ni% Fe%
Alloy 42 Max 0.05 Max 0.020 Max 0.020 Max 0.80 Max 0.30 Max 0.10 Max 1.0 41.0-42.5 Bal.

Specifications

Grade UNS Werkstoff Nr. Wire/Strip/Sheet/Bar
Alloy 42 K94100 1.3917 ASTM F30

Physical Properties

Grade Density Melting Point Electric Resistivity
Alloy 42 8.12 g/cm3 1440°C 0.61μΩ·m

Mechanical Properties

Grade Tensile Strength N/mm²
Soft Hard
Alloy 42 Strip <590 >700

Coefficient of Expansion

Grade Linear Coefficient of Thermal Expansion ā,10-6/℃
20-100℃ 20-200℃ 20-300℃ 20-400℃ 20-450℃ 20-500℃ 20-600℃
Alloy 42 5.6 4.9 4.8 5.9 6.9 7.8 9.2

Size Range

Alloy 42 Wire: ¢0.1mm-¢9mm
Alloy 42 Bar: ¢11mm-¢200mm
Alloy 42 Strip: 75-110mm*0.15-22mm

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