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[China]
Trade Verify
Address: Room 311, No.1211, Mudanjiang Road, Baoshan district, Shanghai
Contact name:Qiu
Ohmalloy Material Co.,Ltd |
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Verified Suppliers
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Sealing Ceramic Vacuum Switch Fe Ni Co Alloy Ceramic - To - Metal
Ohmalloy-4J33 for Sealing and matching ceramics
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.
| 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 |
| Density (g/cm3) | 8.27 |
| Electrical resistivity at 20℃(Ωmm2/m) | 0.46 |
| Thermal conductivity, λ/ W/(m*℃) | 17.6 |
| Curie point Tc/ ℃ | 440 |
| Elastic Modulus, E/ Gpa | 139 |
| The heat treatment process | |
| Stress relief annealing | Heating to 470~540℃. Keep 1~2h, cooling in the air |
| Annealing | Heating to 750~ 900℃ In the medium vacuum |
| Holding time, h | 15min. ~ 1 hour |
| cooling | In the air |
Coefficient of expansion
| θ/℃ | α1/10-6℃-1 | θ/℃ | α1/10-6℃-1 |
| 20~300 | 6.3 | 20~400 | 6.1 |
| 20~500 | 6.9 | 20~600 | 8.3 |
| Tensile Strength | Elongation |
| Mpa | % |
| 539 | 32 |
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 | |
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.
