ovar Expan sion Precision Alloy Ni29Co18 Uns K94610 (4J29)
Product Description
OhmAlloy-4J29 (ExpAN SIon alloy)
4J29(China); 29H, 29H-B, Techallony(Russia); Kovar, Rodar, Glasseal 29-17(United States); Nilo K, Telcaseal(Great Britain); KV-1, KV-2, KV-3(Japan); Dilver P0, Dilver P1(France); Vacon 12, Silvar 48(Germany).
4J29 expAN SIon alloy, also known as Kovar alloy, is a Nickel Iron alloy with 29% Nickel, 17% Cobalt and the remaining balance is Iron. The expAN SIon characteristics of Kovar match both borosilicate (or Pyrex) glasses and alumina ceramics, making it one of the most popular controlled expAN SIon alloys for hermetic sealing applications. Kovar is produced to ensure good properties for machining and deep drawing, and is a porosity free product. You'll find Kovar in applications such as power tubes, microwave tubes, trAN SIstors, diodes, hybrid packages, and other kinds of scientific instruments.
Application:
The alloy is widely used as glass sealing for electronic vacuum devices, such as launching tube, oscillating tube, ignitron, magnetron, trAN SIstor, sealing plug, relay, leading wire of integrated circuit, chassis, shell, scaffold and so on.
Physical Constants:
Density:8.17g/cm³
Specific gravity (g/cm3): 8.36
Melting point(ºC): 1450
Melting heat(calorie/g): 64
Vapour pressure (μ M): 1× 10-6 (1000ºC)
Specific heat(calorie/g/ºC): 0.105 (0ºC)
0.155 (430ºC)
Heat conductivity(calorie/cm· Sec. · ºC): 0.0395 (30ºC)
0.0485(300ºC)
Curie temperature (ºC): 435
γ α Phase-trAN SItion temperature(ºC): Below -80
Electrical performance:
Resistivity (μ Ω -mm): 49 (25ºC)
| Varieties |
Steel type
Specifications
mm |
Precision
alloy |
Resistance Alloys for electrical heating |
Super alloy |
Welding wire |
Corrosion resistant
alloy |
| Rods |
hot rolling rods |
Φ8~38mm |
available |
|
available |
|
available |
| Cold-drawn rods |
≤50mm |
available |
|
available |
|
available |
| Forged rods |
Φ38~350mm |
available |
|
available |
|
available |
| Wires |
Round wires |
Φ0.3~8mm |
available |
available |
available |
available |
available |
| Non-circle wires |
Negotiation |
available |
|
available |
|
available |
| Strips |
Cold rolling |
0.15~4×200mm |
available |
available |
available |
|
available |
| Hot rolling |
4~22×200mm |
available |
available |
available |
|
available |
| Plates |
Cold rolling |
0.5~4×1000×2000mm |
available |
|
available |
|
available |
| Hot rolling |
4~22×1000×2000mm |
available |
|
available |
|
available |
| tubes |
Φ4~63×0.5~5mm |
|
|
available |
|
available |
| Executive standard: GB, GJB, HB, YB, ASTM, AMSE, negotiation and so on. |
Style of supply
| Alloys Name |
Type |
Dimension |
|
| OhmAlloy-4J29 |
Wire |
D= 0.1~8mm |
|
| OhmAlloy-4J29 |
Strip |
W= 5~250mm |
T= 0.1mm |
| OhmAlloy-4J29 |
Foil |
W= 10~100mm |
T= 0.01~0.1 |
| OhmAlloy-4J29 |
Bar |
Dia= 8~100mm |
L= 50~1000 |
Audited Supplier 
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