Production according to Standards

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