FeNi42 Thermal Expansion Alloy

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Introduction:
The expansion coefficient and curie point of this FeNi42 thermal expansion alloy increase with the increase of nickel content. This alloy is widely used in electric vacuum industry as sealing structure material.

Supply of thermal expansion alloy

Style	Size
Wire	D=0.1~8mm
Strip	W= 5~250mm	T= 0.1mm
Foil	W= 10~100mm	T= 0.01~0.1mm
Rod	D=8~100mm	L=50~1000mm

Chemical composition (%)

Ni	41.5~42.5	Fe	Bal.	Co	-	Si	≤0.3
Mo	-	Cu	-	Cr	-	Mn	≤0.8
C	≤0.05	P	≤0.02	S	≤0.02	Al	≤0.1

Physical property

Density (g/cm3)	8.12
Resistivity under 20℃(Ωmm2/m)	0.61
Thermal conductivity, λ/ W/(m*℃)	14.6
Curie point, Tc/ ℃	360
Elasticity modulus, E/ Gpa	147

Expansion coefficient

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

Mechanical property

Tensile Strength (Mpa)	Elongation (%)
490	35

Heat treatment process

Annealing	Be heated to 900 ±20℃ in hydrogen environment.
Heat preservation (h)	1h
Cooling	Be cooled below 200℃ at a speed of no more than 5 ℃ / min.

Index
iron nickel alloy, alloy pipe

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