Iron
Fe
Bal.
Nickel
Ni
41.5~42.5%
Manganese
Mn
≤0.8%
Silicon
Si
≤0.3%
Aluminium
Al
≤0.1%
Carbon
C
≤0.05%
Sulphur
S
≤0.02%
Phosphorus
P
≤0.02%
Alloy 42 is an iron-nickel alloy containing 42% nickel. It is very similar to Invar 36 and has low thermal expansion properties over a range of temperatures. It is a series of constant expansion alloys that match soft glass and ceramics with different expansion coefficients in a given temperature range by adjusting the nickel content. The expansion coefficient and Curie point increase with the increase of nickel content. Alloy 42 is mainly used as a gas and bimetallic gas for semiconductor lead frames in integrated circuits, and can also be used for ceramic and alumina metal seals and glass envelopes on metal seals.
Available shapes:
Alloy 42 wire, bar, bar, strip, forming, sheet, sheet, tube and other standard shapes are available.
Alloy 42 Physical properties
Density |
Resistivity at 20℃ |
Thermal conductivity |
Elastic modulus |
Curie point |
Tensile strength |
Elongation |
(g/cm3) |
(Ωmm2/m) |
λ/ W/(m*℃) |
E/ Gpa |
Tc/ ℃ |
Mpa |
% |
8.12 |
0.61 |
14.6 |
147 |
360 |
490 |
35 |
Alloy 42 Coefficient of expansion
θ/℃ |
α1/10-6℃-1 |
θ/℃ |
α1/10-6℃-1 |
20~100 |
5.6 |
20~400 |
5.9 |
20~200 |
4.9 |
20~450 |
6.9 |
20~300 |
4.8 |
20~500 |
7.8 |
20~350 |
4.95 |
20~600 |
9.2 |
Heat treatment process |
Annealing |
Heated to 900 ± 20℃ in hydrogen atmosphere |
Insulation, h |
1 hour |
Cool down |
Cool down to below 200 ℃ at a rate of no more than 5 ℃ / min. |
Alloy 42 Supply form and specification
Alloy grade |
Form |
Size |
Alloy 42 |
Wire |
D= 0.1~8mm |
Alloy 42 |
Strip |
W= 5~250mm |
T= 0.1mm |
Alloy 42 |
Foil |
W= 10~100mm |
T= 0.01~0.1mm |
Alloy 42 |
Bar |
Dia= 8~100mm |
L= 50~1000mm |