4j50 (Expansion-alloy) 50h, N50, Vacovit 500, Feni50

• Transport Package: Plywood
• Specification: 0.02mm-10mm
• Trademark: Ohmalloy
• Origin: China
• Model NO.: 4J50
• Production Capacity: 8000/Week

Product Description

OhmAlloy-4J50  (Expansion alloy)

(Common Name: 50H, N50, Vacovit 500, FeNi50)
4J50 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.
4J50 alloy is widely used the structure of the sealing material in the electric vacuum industry.
Normal composition%

Ni	49.5~50.5	Fe	Bal.	Co	1.0	Si	≤0.3
Mo	-	Cu	-	Cr	-	Mn	≤0.8
C	≤0.05	P	≤0.02	S	≤0.02	Al	≤0.1

Typical Physical properties

Density (g/cm3)	8.21
Electrical resistivity at 20ºC(Ωmm^2/m)	0.44
Thermal conductivity, λ/ W/(m*ºC)	16.7
Curie point   Tc/ ºC	500
Elastic Modulus,  E/ Gpa	158

Coefficient of expansion

θ/ºC	α1/10^-6ºC^-1	θ/ºC	α1/10^-6ºC^-1
20~100	9.8	20~400	9.4

 

20~200	9.8	20~450	9.4
20~300	9.5	20~500	9.7
20~350	9.4	20~600	10.6

Typical Mechanical properties

Tensile Strength	Elongation
Mpa	%
490	35

 

The heat treatment process
Annealing	Heated to 900 ±20ºC in a hydrogen atmosphere
Holding time, h	1 hour
cooling	With speed not more than 5 ºC / min. cooling to below 200 ºC

Style of supply

Alloys Name	Type	Dimension
OhmAlloy-4J50	Wire	D= 0.1~8mm
OhmAlloy-4J50	Strip	W= 5~250mm	T= 0.1mm
OhmAlloy-4J50	Foil	W= 10~100mm	T= 0.01~0.1
OhmAlloy-4J50	Bar	Dia= 8~100mm	L= 50~1000