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 0.02 | Max 0.02 | Max 0.8 | Max 0.3 | Max 0.1 | Max 1.0 | 41.0-42.5 | Bal. |
Designations
UNS K94100
Werkstoff Nr. 1.3917
Specifications
Wire/Strip/Sheet/Bar ASTM F30
Physical Properties
Density： 8.12 g/cm3
Melting Point: 1440°C
Electric Resistivity: 0.61μΩ·m
Mechanical Properties
Alloy 42 Strip: <590 MPa (Soft)
Alloy 42 Strip: >700 Mpa(Hard)
Linear Coefficient of Thermal Expansion ā,10-6/℃
| Grade | 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 |