OHMALLOY
OhmAlloy-4J42 (Expansion alloy)
(Common Name: 42H Glass Sealing 42, Nilo42, N42, FeNi42)
4J42 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.
4J42 alloy is widely used the structure of the sealing material in the electric vacuum industry.
Normal composition%
| Ni | 41.5~42.5 | Fe | Bal. | Co | - | Si | ≤0.3 |
| Mo | - | Cu | - | Cr | - | Mn | ≤0.8 |
| C | ≤0.05 | P | ≤0.02 | S | ≤0.02 | Al | ≤0.1 |
Typical Physical properties
| Density (g/cm3) | 8.12 |
| Electrical resistivity at 20ºC(Om*mm2/m) | 0.61 |
| Thermal conductivity, λ/ W/(m*ºC) | 14.6 |
| Curie point Tc/ ºC | 360 |
| Elastic Modulus, E/ Gpa | 147 |
Coefficient of expansion
| θ/ºC | α1/10-6ºC-1 | θ/ºC | α1/10-6ºC-1 |
| 20~100 | 5.6 | 20~400 | 5.9 |
| 20~200 | 4.9 | 20~450 | 6.9 |
| 20~300 | 4.8 | 20~500 | 7.8 |
| 20~350 | 4.95 | 20~600 | 9.2 |
Typical Mechanical properties
| Tensile Strength | Elongation |
| Mpa | % |
| 490 | 35 |
| The heat treatment process |
| Annealing | Heated to 900 ±20ºC in a hydrogen atmosphere |
| Holding time, h | 1 hour |
| cooling | With speed not more than 5 ºC / min. cooling to below 200 ºC |
Style of supply
| Alloys Name | Type | Dimension | |
| OhmAlloy-4J42 | Wire | D= 0.1~8mm | |
| OhmAlloy-4J42 | Strip | W= 5~250mm | T= 0.1mm |
| OhmAlloy-4J42 | Foil | W= 10~100mm | T= 0.01~0.1mm |
| OhmAlloy-4J42 | 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 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.