Alloy 52 (Vacoil52) Expansion alloy tube meet Sealing Industry Standard AS90003, Rev. 2001-10. Require.
(Common Name: 52H,N52, FeNi52, Vacodil52)
Alloy52 The iron-nickel constant expansion alloy is a series of constant expansion alloys that can be matched with soft glass and ceramics with different expansion coefficients in a given temperature range by adjusting the nickel content. Its expansion coefficient and Curie point increase with the increase in nickel content. The combination gold is a sealing structure material widely used in the electric vacuum industry.
The alloy is mainly used for sealing with soft lead glass and small electronic tube leads. Zh
In the application, the selected sealing material should match the expansion coefficient of the alloy. The grain size should be controlled during heat treatment to ensure that the material has good deep-drawing properties. When using forged and rolled materials, the air tightness of the materials should be strictly checked.
Normal composition%
| Ni |
51.5~52.5 |
Fe |
Bal. |
Co |
- |
Si |
≤0.3 |
| Mo |
- |
Cu |
- |
Cr |
- |
Mn |
≤0.8 |
| C |
≤0.05 |
P |
≤0.02 |
S |
≤0.02 |
|
|
Typical Physical properties
| Density (g/cm3) |
8.25 |
| Electrical resistivity at 20ºC(ohm.mm2/m) |
0.43 |
| Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC |
9.8~11 |
| Thermal conductivity, λ/ W/(m*ºC) |
16.7 |
| Curie point Tc/ ºC |
520 |
| Elastic Modulus, E/ Gpa |
144 |
Coefficient of expansion
| θ/ºC |
α1/10-6ºC-1 |
θ/ºC |
α1/10-6ºC-1 |
| 20~-60 |
|
20~100 |
10.3 |
| 20~-40 |
|
20~200 |
10.4 |
| 20~-20 |
|
20~300 |
10.2 |
| 20~-0 |
|
20~350 |
10.3 |
| 20~50 |
|
20~400 |
10.3 |
| 20~100 |
|
20~450 |
10.3 |
| 20~150 |
|
20~500 |
10.3 |
| 20~200 |
|
20~600 |
10.8 |
Typical Mechanical properties
| Tensile Strength |
Elongation |
| Mpa |
% |
| 641 |
14 |
| 689 |
9 |
| 731 |
8 |
| The heat treatment process |
| Annealing for stress relief |
Heated to 530~550ºC 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 830~880ºC 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
|
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 batch,6m/order.
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.
Audited Supplier 
){kind=link}