FeNi36 4J36 Plate Expansion Precision Alloys Polished Surface

Invar magnetic properties Hot Rolled and Polished Invar 36 special alloy 4J36 plate
 

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%

Typical Physical properties

Coefficient of expansion

Typical Mechanical properties

 

Temperature factor of resistivity

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

 

The heat treatment process
Annealing for stress relief	Heated to 530~550℃ 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 830~880℃ in vacuum,hold 30 min.
The stabilization process	In protective media and heated to 830 ℃, hold 20min. ~ 1h, quench Due to the stress generated by quenching, heated to 315℃,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 ℃ to clear oxidized surface

 

Style of supply

Alloys Name	Type	Dimension
OhmAlloy-4J36	Wire	D= 0.1~8mm
OhmAlloy-4J36	Strip	W= 5~250mm	T= 0.1mm
OhmAlloy-4J36	Foil	W= 10~100mm	T= 0.01~0.1
OhmAlloy-4J36	Bar	Dia= 8~100mm	L= 50~1000

Package

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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 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.