Ohmalloy Material Co.,Ltd is a high-tech enterprise which specialized in making all kinds of
alloy such as high resistance alloy, low-resistance copper nickel
alloy, precision alloy, FeCrAl alloy and thermocouple Alloy.
Ohmalloy Material Co.,Ltd have a full production line from melting, surface cleaning,
rolling and slitting, full set of testing machine and can meet all
kinds of technical requirement from customer. Our product is widely
used in heating equipment, big steel mill, mineral, electrical
equipment, food machinery, auto industry, aerospace industry. Our
product not only is popular in domestic market, but also been
exported to all over the world.
Our company aims to be the best-quality alloy producer in the
world. We insist on developing the more advanced alloy strip
technology, to serve all the customer, improve people’s living
level, make a more green earth in the future
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).
OhmAlloy-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%
| 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 20℃(Ωmm2/m) | 0.78 |
| Temperature factor of resistivity(20℃~200℃)X10-6/℃ | 3.7~3.9 |
| Thermal conductivity, λ/ W/(m*℃) | 11 |
| Curie point Tc/ ℃ | 230 |
| Elastic Modulus, E/ Gpa | 144 |
Coefficient of expansion
| θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-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, ℃ | 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 |
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 we 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.How do you guarantee the quality?
We have QC who are responsible for tracking and monitoring whole
production process, and we are willing to accept customer‘s
testing.
7. What's our working time?
We will give you reply through email/phone Online chat tool within
24 hours. No matter working day or holidays.
