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Alloy 42

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

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