Ni29co18/ Uns K94610 (4J29) Kovar Expansion Precision Alloy Pipe /
Tube
1.Description:
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 expansion alloy, also known as Kovar alloy, is a Nickel Iron
alloy with 29% Nickel, 17% Cobalt and the remaining balance is
Iron. The expansion characteristics of Kovar match both
borosilicate (or Pyrex) glasses and alumina ceramics, making it one
of the most popular controlled expansion 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, transistors, diodes, hybrid packages, and other kinds of
scientific instruments.
2. Chemical composition(%):
Grade |
C |
Si |
Mn |
P |
S |
Ni |
Co |
Fe |
4J29 |
0.015 |
0.12 |
0.25 |
0.006 |
0.005 |
29.10 |
17.3 |
Bal |
3. Physical properties
Grade |
Density(g/cm3) |
Thermal expansion coefficient (10-6/°C) |
Curie point(°C) |
Volume resistivity(μΩ.cm) |
Thermal conductivity(W/m. °C) |
4J29 |
8.17 |
5.0(20~300°C)
5.2(20~450°C |
430 |
46(20°C) |
20.3 |
4. Mechnical properties:
Grade |
Yield Strength(Mpa) |
Tensile Strength |
Elongation(%) |
Hardness(HV) |
4J29 |
Temper rolled |
695 |
780 |
5 |
230 |
As annealed |
315 |
520 |
24 |
148 |
5.Application:
The alloy is widely used as glass sealing for electronic vacuum
devices, such as launching tube, oscillating tube, ignitron,
magnetron, transistor, sealing plug, relay, leading wire of
integrated circuit, chassis, shell, scaffold and so on.
6.size:
Kovar tubes / Pipes: Φ1.0~80×0.02~20mm
7.Advantages:
1.Pass: ISO9001 certification
2.fine after-sale services
3.small order accepted
4.samples available
5.short delivery time
