Low Thermal Expansion Coefficient Invar 36 Bar (Ni36Fe, Fe-36Ni, NiInvar)

• Customization: Available
• Classification: Rare Metal
• Feature: Low Coefficient of Thermal Expansion
• Model NO.: Invar 36
• Surface Treatment: Smooth and Bright
• Density: 8.1g/cm3
• Other Common Name: Invar, Feni36, Vacodil36, Niinvar
• Transport Package: Standard Seaworthy Package(Wooden Boxes Package
• Specification: ASTM/ASME/AISI/GB/DIN
• Trademark: Ualloy
• Origin: Zhejiang, China
• HS Code: 75052100
• Production Capacity: 500tons/Year

Product Description

Low thermal expansion coefficient Invar 36 Bar(Ni36Fe,Fe-36Ni,NiInvar)

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36,AFNOR NF A54-301,ASTM F 1684-06,EN 1.3912
UNS K93600, UNS K93603,Werkstoff 1.3912)

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).

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 mm^2/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/ 10^3 *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
4J36	Wire	D= 0.1~8mm
4J36	Strip	W= 5~250mm	T= 0.1mm
4J36	Foil	W= 10~100mm	T= 0.01~0.1
4J36	Bar	Dia= 8~100mm	L= 50~1000

Package:All the bar will be packed into wooden case.