Expansion Alloy Invar 4j36 Wire for Glass Seal

Product Type: Wire
Material: Feni Alloy
Carbon Content: Low Carbon
PCD: 0~100
ET: 0~100
Hole: 0
Customization:

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Basic Info.

Model NO.
OhmAlloy-4J36
Diameter
0.05~10mm
Condition
Bright Surface, Soft
Heat Treatment
Done
Magnetic Properties
Less Than 230 Celsius Is Ferromagnetic.
Transport Package
Spool, Wooden Case
Specification
SGS
Trademark
OhmAlloy-4J36
HS Code
722990900
Production Capacity
5000 Kgs Per Month

Product Description

OhmAlloy-4J36  (Expansion alloy)

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)
OhmAlloy-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).
 
The name Invar comes from the word invariable, referring to its relative lack of expansion or contraction with temperature changes.
 
It was invented in 1896 by Swiss physicist Charles Édouard Guillaume. He received the Nobel Prize in Physics in 1920 for this discovery, which enabled improvements in scientific instruments.
OhmAlloy-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
35~37.0FeBal.Co-Si≤0.3
Mo-Cu-Cr-Mn0.2~0.6
C≤0.05P≤0.02S≤0.02  
 
 

Typical Physical properties

Density (g/cm3)
8.1
Electrical resistivity at 20ºC(mm2/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

 
 
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 Mechanical properties

Tensile Strength
Elongation
Mpa%
64114
6899
7318
 
Temperature factor of resistivity
Temperature range, ºC20~5020~10020~20020~30020~400
aR/ 103 *ºC1.81.71.41.21.0
 
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
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 NameTypeDimension 
OhmAlloy-4J36WireD= 0.1~8mm 
OhmAlloy-4J36StripW= 5~250mmT= 0.1mm
OhmAlloy-4J36FoilW= 10~100mmT= 0.01~0.1
OhmAlloy-4J36BarDia= 8~100mmL= 50~1000
     

FAQ

1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.
2. How can you pay for small sample amount?
We have Western union account, wire transfer for sample amount also ok.

3. Customer do not have express account. How will us arrange the delivery for sample order?
Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.

4. What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.

5. Do you provide free samples?
If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.

6. What's our working time?
We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.

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