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Invar Feni Precision Alloy Strip

China Invar Feni Precision Alloy Strip, Find details about China Invar 36, Invar 36 Strip from Invar Feni Precision Alloy Strip

Model NO.
Invar
Material
Fe- Ni Alloy
Surface
Smooth and Bright
Condition
Soft
Width
300mm
Thickness
0.02-2.5mm
Trademark
TANKII
Transport Package
Wooden Case
Specification
1.5x200
Origin
Shanghai, China
HS Code
7505120000
Model NO.
Invar
Material
Fe- Ni Alloy
Surface
Smooth and Bright
Condition
Soft
Width
300mm
Thickness
0.02-2.5mm
Trademark
TANKII
Transport Package
Wooden Case
Specification
1.5x200
Origin
Shanghai, China
HS Code
7505120000

NiFe 36 Nickel Iron Invar Alloy Strip

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)

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.

4J36 use oxyacetylene welding, electric arc welding, welding and other welding methods. Since the coefficient of expansion and chemical composition of the alloy is related should be avoided due to welding causes a change in the alloy composition, it is preferable to use Argon arc welding welding filler metals preferably contains 0.5% to 1.5% titanium, in order to reduce weld porosity and crack.

Normal composition%

Ni35~37.0FeBal.Co-Si≤0.3
Mo-Cu-Cr-Mn0.2~0.6
C≤0.05P≤0.02S≤0.02  

Coefficient of expansion

θ/ºCα1/10-6ºC-1θ/ºCα1/10-6ºC-1
20~-601.820~2503.6
20~-401.820~3005.2
20~-201.620~3506.5
20~-01.620~4007.8
20~501.120~4508.9
20~1001.420~5009.7
20~1501.920~55010.4
20~2002.520~60011.0

 

Typical Physical properties

Density (g/cm3)8.1
Electrical resistivity at 20ºC(OMmm2/m)0.78
Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC3.7~3.9
Thermal conductivity, λ/ W/(m*ºC)11
Curie point Tc/ ºC230
Elastic Modulus, E/ Gpa144

 

The heat treatment process
Annealing for stress reliefHeated to 530~550ºC and hold 1~2 h. Cold down
annealingIn 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
  1. In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench
  2. Due to the stress generated by quenching, heated to 315ºC,hold 1~4h.
Precautions
  1. Can not be hardened by heat treatment
  2. Surface treatment can be sandblasting, polishing or pickling.
  3. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface

Typical Mechanical properties

Tensile StrengthElongation
Mpa%
64114
6899
7318

Temperature factor of resistivity

Temperature range, ºC20~5020~10020~20020~30020~400
aR/ 103 *ºC1.81.71.41.21.0

 

Invar Feni Precision Alloy Strip




 

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