OhmAlloy-4J33 (Expansion alloy)
(Common Name: 33НК, 4J33, KV-4, Ni33Co17)
4J33 alloy has a close Linear expansion coefficient with 95% Al2O3 ceramic in the range of -60 to 600 degrees Celsius. it is an Important sealing structural material in the electric vacuum industry; Mainly used for matching and ceramic sealing.
Normal composition%
| Ni |
32.0~33.6 |
Fe |
Bal. |
Co |
14.0~15.2 |
Si |
≤0.3 |
| Mo |
- |
Cu |
- |
Cr |
- |
Mn |
≤0.5 |
| C |
≤0.05 |
P |
≤0.02 |
S |
≤0.02 |
|
|
Typical Physical properties
| Density (g/cm3) |
8.27 |
| Electrical resistivity at 20ºC(Om*mm2/m) |
0.46 |
| Thermal conductivity, λ/ W/(m*ºC) |
17.6 |
| Curie point Tc/ ºC |
440 |
| Elastic Modulus, E/ Gpa |
139 |
Coefficient of expansion
| θ/ºC |
α1/10-6ºC-1 |
θ/ºC |
α1/10-6ºC-1 |
| 20~300 |
6.3 |
20~400 |
6.1 |
| 20~500 |
6.9 |
20~600 |
8.3 |
Typical Mechanical properties
| Tensile Strength |
Elongation |
| Mpa |
% |
| 539 |
32 |
| The heat treatment process |
| Stress relief annealing |
Heating to 470~540ºC. Keep 1~2h, cooling in the air |
| Annealing |
Heating to 750~ 900ºC In the medium vacuum |
| Holding time, h |
15min. ~ 1 hour |
| cooling |
In the air |
Style of supply
| Alloys Name |
Type |
Dimension |
|
| OhmAlloy-4J33 |
Wire |
D= 0.1~8 mm |
|
| OhmAlloy-4J33 |
Strip |
W= 5~250 mm |
T= 0.1 mm |
| OhmAlloy-4J33 |
Foil |
W= 10~100 mm |
T= 0.01~0.1 mm |
| OhmAlloy-4J33 |
Bar |
Dia= 8~100 mm |
L= 50~1000 mm |
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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