Invar4j36

• Product Type: Bar, Wire, Strip, Sheet
• Material: Nicr
• Carbon Content: Low Carbon
• Condition: Annealed Polished
• Transport Package: Wooden Case
• Trademark: Ualloy
• Model NO.: 4J36
• Origin: China
• Production Capacity: 300t/Year

Product Description

Invar

Invar

Ualloy-4J36 (Expansion alloy)

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
Ualloy-4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is a nickel-iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).

Ualloy-4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.

Normal composition%

Ni	35~37.0	Fe	Bal.	Co	-	Si	≤0.3
Mo	-	Cu	-	Cr	-	Mn	0.2~0.6
C	≤0.05	P	≤0.02	S	≤0.02

 

Typical Physical properties

Density (g/cm3)	8.1
Electrical resistivity at 20ºC(OHM*mm2/m)	0.78
Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC	3.7~3.9
Thermal conductivity, λ/ W/(m*ºC)	11
Curie point Tc/ ºC	230
Elastic Modulus, E/ Gpa	144

 

 

 

Coefficient of expansion

θ/ºC	α1/10-6ºC-1	θ/ºC	α1/10-6ºC-1
20~-60	1.8	20~250	3.6
20~-40	1.8	20~300	5.2
20~-20	1.6	20~350	6.5
20~-0	1.6	20~400	7.8
20~50	1.1	20~450	8.9
20~100	1.4	20~500	9.7
20~150	1.9	20~550	10.4
20~200	2.5	20~600	11.0

 

Typical Mechanical properties

Tensile Strength	Elongation
Mpa	%
641	14
689	9
731	8

Temperature factor of resistivity

Temperature range, ºC	20~50	20~100	20~200	20~300	20~400
aR/ 103 *ºC	1.8	1.7	1.4	1.2	1.0

The heat treatment process
Annealing for stress relief	Heated to 530~550ºC and hold 1~2 h. Cold down
annealing	In order to eliminate hardening, which be bring out in cold-rolled, cold drawing process. Annealing needs heated to 830~880ºC in vacuum,hold 30 min.
The stabilization process	In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench Due to the stress generated by quenching, heated to 315ºC,hold 1~4h.
Precautions	Can not be hardened by heat treatment Surface treatment can be sandblasting, polishing or pickling. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface

 

Style of supply

Alloys Name	Type	Dimension
Ualloy-4J29	Wire	D= 0.1~8mm
Ualloy-4J29	Strip	W= 5~250mm	T= 0.1mm
Ualloy-4J29	Foil	W= 10~100mm	T= 0.01~0.1
Ualloy-4J29	Bar	Dia= 8~100mm	L= 50~1000